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Clam Bay Committee Agenda 07/16/2013 PELICAN BAY SERVICES DIVISION Municipal Service Taxing and Benefit Unit NOTICE OF PUBLIC MEETING TUESDAY, JULY 16, 2013 THE CLAM BAY COMMITTEE OF THE PELICAN BAY SERVICES DIVISION BOARD WILL MEET TUESDAY, JULY 16 AT 1:00 PM AT THE COMMUNITY CENTER AT PELICAN BAY, 8960 HAMMOCK OAK DRIVE, NAPLES, FL 34108. AGENDA The agenda includes, but is not limited: 1. Roll Call 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan 3. Available resources for update of Clam Bay Management Plan, including, but not limited to: a. 1998 Clam Bay Restoration and Management Plan b. 2008 Draft of Clam Bay Mangrove Management Plan c. 2010 Florida Department of Environmental Protection documents submitted with Joint Environmental Resource permit application to continue Clam Bay channel maintenance activities d. 2013 U.S. Army Corps of Engineers Nationwide Permit documents submitted with permit application for Dredging Clam Pass e. 2013 Priority Topics of Stakeholders and Suggested Table of Contents 4. Timeline for updated Clam Bay Management Plan 5. Audience comments 6. Adjourn ANY PERSON WISHING TO SPEAK ON AN AGENDA ITEM WILL RECEIVE UP TO THREE (3) MINUTES PER ITEM TO ADDRESS THE BOARD. THE BOARD WILL SOLICIT PUBLIC COMMENTS ON SUBJECTS NOT ON THIS AGENDA AND ANY PERSON WISHING TO SPEAK WILL RECEIVE UP TO THREE (3) MINUTES. THE BOARD ENCOURAGES YOU TO SUBMIT YOUR COMMENTS IN WRITING IN ADVANCE OF THE MEETING. ANY PERSON WHO DECIDES TO APPEAL A DECISION OF THIS BOARD WILL NEED A RECORD OF THE PROCEEDING PERTAINING THERETO, AND THEREFORE MAY NEED TO ENSURE THAT A VERBATIM RECORD IS MADE, WHICH INCLUDES THE TESTIMONY AND EVIDENCE UPON WHICH THE APPEAL IS TO BE BASED. IF YOU ARE A PERSON WITH A DISABILITY WHO NEEDS AN ACCOMMODATION IN ORDER TO PARTICIPATE IN THIS MEETING YOU ARE ENTITLED TO THE PROVISION OF CERTAIN ASSISTANCE. PLEASE CONTACT THE PELICAN BAY SERVICES DIVISION AT (239) 597-1749. VISIT US AT HTTP://PELICANBAYSERVICESDIVISION.NET. 7/12/2013 10:10:21 AM Page 1 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 1 of 19 U. Request for reconsideration by Commissioner Hiller of Item#11D from the November 13,2012 BCC Meeting titled: Recommendation to approve the final beach access sign renderings for installation throughout the Gulf Shore Drive corridor for direct public beach access via county easements. Approved—3/2(Commissioner Fiala and Commissioner Coyle opposed) V. Request for reconsideration by Commissioner Hiller of Item#11M from the November 13,2012 BCC Meeting titled: Recommendation to consider options for re-structuring the Board Office. Approved—4/1 (Commissioner Coyle opposed) Wednesday.December 12.2012 W. Recommendation that the Board of County Commissioners accept the settlement offer presented by Petitioners in DOAH Case No. 12-495;and, that the settlement agreement related thereto,as presented herein,be executed on December 11,2012 by the Chair of the Board of County Commissioners on behalf of Collier County. (Commissioner Hiller) Motion to accept evidence—Approved 4/1(Commissioner Coyle opposed);Motion to accept settlement offer with modifications and bring back after lunch to review—Approved 3/2(Commissioner Coyle and Commissioner Fiala opposed);Item tabled until after lunch— Consensus Motion to accept the changes of the agreement—Approved 3/1(Commissioner Coyle opposed and Commissioner Fiala absent); Motion to accept the settlement Agreement—Approved 3/1 (Commissioner Fiala opposed and Commissioner Coyle absent) Time Certain(Per Agenda Change Sheet) X. This itemtobitheard at 2:30 n.m.Recommendation that effective immediately,Clam Pass be considered part of the ongoing manag responsthilitieS of the Pelican Bay Services es Division'maw)bviuding but not limited to all monitoring components such as biological,tidal,and h c data collection,and,inlet dred$e perm tti ton;that yl?; i� PBSD,exclusively,shall make recommendations to the,. of Camay Comm Commissiottets as to when the inlet should be dredged, mcomnwsulatiOtts related to managing the unified Clam ikty system tut it deems necestigs further,that Cl 'n Pass,being an int art of the.. Bay syi in aged as such. This is a compaction to Item#IOY. (Commis E it r) Page 11 December 11-12,2012 Page 1ot19 Page 2 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 2 of 19 manner he deems necessary;further,that the County Attorney assess what civil and/or criminal liability the county may face if the final determination on appeal is that the county materially misrepresented to the federal government(by way of overstatement)what the storm related beach re- nourishment expenses were,and report back to the Board of County Commissioners. (Commissioner Hitler) Approved—410(Commissioner Coyle absent) Wednesday.December 12,2012 AB. Recommendation that the Board authorize the County Manager to sign the attached notice,and that such notice be given to terminate the Red Light Camera contract between Collier County and ATS,effective February 28, 2013;to direct that all red light cameras be duly removed from all intersections in accordance with the ATS contract;and,to further direct staff to investigate and report back to the Board(1)whether traffic lights can be retimed so drivers will encounter fewer red lights,(2)whether it is appropriate to increase the duration of the yellow light between the green and the red,and(3)whether it is appropriate to add or increase the "clearance"phase to the intersection's traffic signals during which all directions have a red light,all in the interest of enhancing the public's safety. (Commissioner Hiller) Motion to approve and staff to bring back a report on the timing of traffic lights at the first meeting in February 2013—Approved 3/2 (Commissioner Fiala and Commissioner Coyle opposed) Time Certain(Per Agenda Change Sheet) AC This item to be heard.at 2:30 tom.,Recommendation to direct Tune1 ?Hail &Associate*,Inc,to prepare a work o r under Contract°#10-5 71 to update the existing Clam Bay Management t Plan to ensue the prosetystion of the Clam Bay and compliance with this PtesetseS NOW Resouttteervation Area(MON"designation;and,to*AAA*criteria eoindicotos tot evaluation of&MOOS needs for pua ae or maintaining ataaining flushing for the envitonnlesstal benefit of the Claw Bay system t present such artireic order to the POO t 11:0C,and the BCC at die fitatirunutry, 2413'nareting,0f eat of thew respeetive boards. (Co w° ) Motion to Arid t ` a **lit ti 004571 —Approved` 12 wiewithotionit4,eoyie,a ddss rv, er F opPosed) Page 13 December 11-12,2012 Page 2 of 19 Page 3 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 3 of 19 12/11/2012 Item 10.X. EXECUTIVE SUMMARY Recommendation that effective immediately,Clam Pass be considered part of the ongoing management responsibilities of the Pelican Bay Services Division ("PBSD")including but not limited to all monitoring components such as biological,tidal,and hydrographic data collection, and, inlet dredge permitting/construction; that PBSD, exclusively, shall make recommendations to the Board of County Commissioners as to when the inlet should be dredged,and make such other recommendations related to managing the unified Clam Bay system as it deems necessary; further,that Clam Pass,being an integral part of the Clam Bay system,is managed as such. OBJECTIVE: Effective immediately, that Clam Pass be considered part of the ongoing management responsibilities of the Pelican Bay Services Division("PBSD")including but not limited to all monitoring components such as biological,tidal,and hydrographic data collection, and,inlet dredge permitting/construction;that PBSD,exclusively,shall make recommendations to the Board of County Commissioners as to when the inlet should be dredged,and make such other recommendations related to managing the unified Clam Bay system as it deems necessary; further,that Clam Pass,being an integral part of the Clam Bay system,is managed as such. CONSIDERATIONS: The purpose of the maintenance permit for the dredging of Clam Pass is to provide adequate tidal flushing of the Clam bay system for environmental benefits. The health and welfare of the Clam Bay system relies on adequate flushing,which starts with the inlet,yet is closely related to the shoaling within the system, and that shoaling largely occurs from the sand entering Clam Pass,so the two are inextricably related. Therefore bifurcating the project,as it was originally designed and permitted for the Clam Bay Restoration and Management Plan, into an inlet project and an interior environmental project resulting in two separately managed projects,is not the most efficient approach to managing this system. Clam Pass is an integral part of the Clam Bay system,and should be managed as such. Florida statutes and administrative rules require that sand dredged from the inlet be placed along the adjacent shorelines influenced by the inlet and experiencing erosion. The maintenance of Clam Pass should continue to address the erosion along the beaches with the immediate vicinity of Clam Pass and should not be considered part of the larger scale beach management program for Collier County. Over dredging Clam Pass for the purpose of obtaining additional sand for areas beyond the influence of Clam Pass can lead to additional localized shoreline and inlet stability problems in the immediate vicinity of Clam Pass. It is recommended that Clam Pass be considered part of the ongoing management responsibilities of the PBSD including all monitoring components such as biological, tidal, and hydrographic data collection. (The important tide monitoring portion of this plan has always remained under PBSD's jurisdiction). PBSD shall be responsible for the inlet dredge permitting/construction. PBSD, exclusively, shall make recommendations to the Board of County Commissioners as to when the inlet should be dredged, and make such other recommendations related to managing Packet Page-959- Page 3 of 19 Page 4 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 4 of 19 12/11/2012 Item 10.X. the unified system as is needed to preserve the environmental health of this Natural Resource Protection Area("NRPA"). The PBSD's track record in being able to successfully manage the system through the highly successful mangrove recovery period is an indication that the PBSD is the right entity for the important responsibility of ensuring the preservation of the restored system. FISCAL IMPACT: None LEGAL CONSIDERATIONS: This item has been reviewed by the County Attorney,is legally sufficient,and requires majority vote for approval. -JAK. RECOMMENDATION: Effective immediately, that Clam Pass be considered part of the ongoing management responsibilities of the Pelican Bay Services Division("PBSD")including but not limited to all monitoring components such as biological, tidal, and hydrographic data collection, and, inlet dredge permitting/construction; that PBSD, exclusively, shall make recommendations to the Board of County Commissioners as to when the inlet should be dredged, and make such other recommendations related to managing the unified Clam Bay system as it deems necessary; further, that Clam Pass, being an integral part of the Clam Bay system, is managed as such. PREPARED BY: Commissioner Georgia Hiller Packet Page-960- Page 4 of 19 Page 5 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 5 of 19 12/11/2012 Item 10.X. COLLIER COUNTY Board of County Commissioners Item Number: 10.X. Item Summary: Recommendation that effective immediately,Clam Pass be considered part of the ongoing management responsibilities of the Pelican Bay Services Division("PBSD") including but not limited to all monitoring components such as biological,tidal,and hydrographic data collection,and,inlet dredge permitting/construction;that PBSD,exclusively, shall make recommendations to the Board of County Commissioners as to when the inlet should be dredged,and make such other recommendations related to managing the unified Clam Bay system as it deems necessary; further,that Clam Pass,being an integral part of the Clam Bay system,is managed as such. This is a companion to Item 10Y. (Commissioner Hiller) Meeting Date: 12/11/2012 Prepared By Name:BrockMaryJo Title:Executive Secretary to County Manager,CMO 12/5/2012 11:06:24 AM Submitted by Title:Executive Secretary to County Manager,CMO Name:BrockMaryJo 12/5/2012 11:06:25 AM Approved By Name:KiatzkowJeff Title:County Attorney Date:12/5/2012 11:45:16 AM Name:OchsLeo Title:County Manager Date: 12/5/2012 1:41:19 PM Packet Page-961- Page 5 of 19 Page 6 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 6 of 19 12111/2012 Item 10.AC. EXECUTIVE SUMMARY Ret:Oninktifkik4014 to d t'Tttt rtli►Hall.d:Aesodates,hies to prepare*t ,onlar-ander Co 'i ,• ! I t .tit;-lip Menelitemeett tth, A'S, 1 free efISt Litt *tom p a l Px rt rv*1l* a ("N tP"A ) da ltiont and, to cttt bIis bt CMOs. aiat biltheat011 for ' tom►, 'd 3 i or lib�rlt�t a s to wood Work otdor to the POWthe 'l aid the 11CCetl ,llhat,kes o2•13***Ito t # ftut*te►pe +e boat&' OCTIVE: To update the existing Clam Bay Management Plan to ensure the preservation of the Clam Bay system and compliance with the preserve's NRPA designation; and,to establish criteria as indicators for evaluation of dredging needs for the purpose of maintaining flushing for the environmental benefit of the Clam Bay system. This shall be accomplished through a work order under Contract #10-5571 for a total cost not to exceed $34,000. The work order deliverables shall include the following: . Update the Clam Bay Management Plan to achieve the objective of`preservation' since the `restoration'objective has been successfully achieved. . Modify the State and Federal maintenance dredging permits to incorporate the revised Management Plan objective. . Develop and implement an updated Monitoring Plan consistent with the revised objective of the Management Plan. CONSIDERATIONS: The Clam Bay Management Plan has successfully achieved the restoration of the mangrove system within Clam Bay. The next management phase will entail preserving the restored mangrove system. To that end,the Clam Bay Management Plan shall be updated based on obtained monitoring data to incorporate the preservation objective. Inherent to the preservation of the mangrove system is the need to provide adequate flushing through maintenance dredging of Clam Pass to ensure the health of the mangroves. The update to the Management Plan shall include a recommendation that listed monitoring data, evaluated in totality, shall be the basis for future dredging considerations. The updated Management Plan guidelines shall serve as the basis for the modification of the State and Federal maintenance dredging permits. Clam Pass and Clam Bay shall be recognized and managed as a single unified system, rather than as bifurcated systems, given that both the pass and the bay constitute the NRPA and must be taken as a whole. Further, an updated monitoring plan shall be developed and implemented consistent with the objectives of the updated Management plan. FISCAL IMPACT:, Funding for this work order shall be from the Tourist Development Tax Fund 195;the total cost shall not exceed$34,000. X.EGAL CONSIDERATIONS: This item has been reviewed by the County Attorney,is legally sufficient,and requires majority vote for approval. -JAK Packet Page-1093- Page 6 of 19 Page 7 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 7 of 19 12/11120/2 Item 10.AC. RECOMMENDATION: To update the existing Clam Bay Management Plan to ensure the preservation of the Clam Bay system and compliance with the preserve's NRPA designation; and, to establish criteria as indicators for evaluation of dredging needs for the purpose of maintaining flushing for the environmental benefit of the Clam Bay system. This shall be accomplished through a work order under Contract#10-5571 with Turrell,Hall&Associates for a total cost not to exceed$34,000. The work order deliverables shall include the following: . Update the Clam Bay Management Plan to achieve the objective of`preservation' since the `restoration'objective has been successfully achieved. . Modify the State and Federal maintenance dredging permits to incorporate the revised Management Plan objective. . Develop and implement an updated Monitoring Plan consistent with the revised objective of the Management Plan. Turell,Hall&Assoc.shall present the proposed work order to the PBSD,the TDC,and the BCC at the first January,2013 meeting of each of these respective boards. PREPARED BY: Commissioner Georgia Hiller Packet Page-1094- Page 7 of 19 Page 8 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 8 of 19 1 2/11/2012 Item 10.AC. COLLIER COUNTY Board of County Commissioners item Number: 10.AC. Item Summary: Recommendation to direct Turreii,Hall&Associates,Inc,to prepare a work order under Contract#10-5571 to update the existing Clam Bay Management Plan to ensure the preservation of the Clam Bay system and compliance with this preserve's Natural Resource Preservation Area("NRPA")designation;and,to establish criteria as indicators for evaluation of dredging needs for the purpose of maintaining flushing for the environmental benefit of the Clam Bay system;to present such work order to the PBSD,the TDC,and the BCC at the first January,2013 meeting of each of these respective boards. (Commissioner Hiller) Meeting Date: 12/11/2012 Prepared By Name:BrockMaryJo Title:Executive Secretary to County Manager,CMO 12/5/2012 3:28:42 PM Submitted by Title:Executive Secretary to County Manager,CMO Name:BrockMaryJo 12/512012 3:28:43 PM Approved By Name:KlatzkowJeff Title:County Attorney Date:12/5/2012 3:38:49 PM Name:OchsLeo Title:County Manager Date:I2/5/2012 4:16:07 PM Packet Page-1095- Page 8 of 19 Page 9 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 9 of 19 Time Certain to Immediately Follow Item#10R(Per Agenda Change Sheet) S. Recommendation to aPave a, re re is for planning,pe i tt and engineering ,OVICOS related to ClanrPate apipmve a amendments.°(C missiost Her) Executive Sri marry and b e-up materials for this�will be s ttetd fits an Add-On Item.to tho agenda,the subject to Board°rCoural ap val.) Motion to aPProve the use of Tou swerve Funds(195)to establish feeding the Clam s d redging and arm that serves a valid public Purpose—Approved 4/0(Commissioner COyie abStut) 11. COUNTY MANAGER'S REPORT Wednesday,January 9,2013 A. Recommendation to award Invitation to Bid(ITB)#12-5981 Roadway Paint, Thermoplastic Markings and Raised Markers to Traffic Solution,LLC as the primary vendor and McShea Contracting,LLC as the secondary vendor. (Travis Gossard,Superintendent,Road and Bridge Maintenance,GMD) Approved—4/0(Commissioner Kenning absent) B. Recommendation to review the County's progress coordinating permitting and inspection activities with the building industry and the independent fire districts(Districts)and staffs request for direction on future actions regarding the same. (Nick Casalanguida,Growth Management Division Administrator) Motion to amend interlocal agreements with each agency responsible for their own fees and quarterly reports—Approved 5/0 Wednesday,January 9,2013 C. Recommendation to retain from active sales various properties obtained from Avatar Properties,Inc.,that are part of the Gulf American Corporation Motion directing the County Attorney to review the legalities of the Avatar agreement,to provide a list of properties to the Committee for their input and to report back to the Board for further discussion—4/0 (Commissioner Henning absent) D. This item to be heard at 11:00 a.m. Recommendation to obtain Board direction regarding the proposal received from the stakeholders group to amend the current Isles of Capri Fire District MSTU and authorize the Page 11 January 8-9,2013 Page 9 of 19 Page 10 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 10 of 19 Item 10S January 8, 2013 EXECUTIVE SUMMARY Recommendation to approve agreements for planning, permitting, engineering services and construction phase services related to Clam Pass and approve associated budget amendments. OBJECTIVE: To authorize the necessary agreements with consultants and budget amendments to prepare for the immediate dredging of Clam Pass once all final permits have been issued. CONSIDERATIONS: The Board of County Commissioners on January 8, 2013 (Item 10R) declared the recent closure of Clam Pass to constitute a valid public emergency requiring dredging the pass as soon as practicable. On December 11,2012,items 1OA.C,the Board directed Terrell,Hall&'c Associates to prepare al work order under contract 10;5571 to.update the existing-Clem,Bay Management Plan and tettOn to the Board at the next meeting. Staff received, reviewed and approved the-attached W order,from 'Futrell,Hall d Associates for x,000 per Board approved contract 10-5571. Additional services related to the emergency dredging at Clam Pass, include a Pelican Bay Services Division (PBSD) staff approved purchase order for surveying services to Agnoli, Barber and Brundage for $1 8,400 under Competitive Consultant Negotiation Act (CCNA) competitive solicitation and contract 09-5262. Pelican Bay Services Division staff is also requesting the approval of a purchase/work order with Humiston and Moore for$76,360 to finalize permit plans, complete construction drawings and provide construction phase services for the dredging of Clam Pass. County staff and Humiston and Moore agree that the terms and hourly rates of this emergency engagement are to be consistent with those agreed to under contract 08-5124 Pursuant to Florida Statute 287.055 (3) (a) (1), the CCNA provisions for the procurement of professional services may be waived if a valid public emergency has been declared. The Board's Purchasing Policy XXI and VA 3 and 4 provides for the declaration of an emergency and the waiver of competition to procure the necessary services to respond to that emergency. FISCAL IMPACT: The quoted cost for planning, permitting, engineering services and construction phase services related to the emergency dredging of Clam Pass is $122,760. The estimate can be broken down as follows: Permit& Construction Inlet&Bay Construction Phase Firm Name 'Permitting Mgt.Plan Drawings Services Surveying Total Some of Funds (195) (320) (195) (195) (195) Turret,Hall&Associates _ 16,000 12,000 28,000 Agnoll,Barber&Brundage 18,400 18,400 Humiston and Moore 23,650 52,710 76,360 Total 122,760 Page 10 of 19 Page 11 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 11 of 19 Item 10S January 8 2013 Presently the Turrell,Hall&Associates work order in the amount of$28,000 for dredge permitting and updating the Inlet and Bay Management Plan is funded from the Pelican Bay Services Fund (320). As shown above, a portion of the work is eligible for Tourist Development Tax (TDT) funding and is proposed to be reallocated to TDC Fund (195)once sufficient budget is established. The Agnoli, Barber and Brundage and Humiston and Moore work orders for surveying and engineering and construction phase services are eligible for Tourist Development Tax funding. Staff is recommending a budget amendment be processed in TDC Beach Renourishment Fund (195) moving$110,760 plus a 5%contingency allowance from reserves into a funded program for Clam Pass Dredging and that the eligible component of the Turrell, Hall & Associates work order be moved from Pelican Bay Services Fund(320)to the newly established Clam Pass Dredging project in Fund(195). Dredging costs are not included in this executive summary. GROWTH MANAGEMENT IMPACT: None. LEGAL CONSIDERATIONS: This item has been reviewed by the County Attorney. This item is in essence a companion item to Agenda Item 10-R. Item 10-R requests that"the Board of County Commissioners declares the recent closure of Clam Pass to constitute an emergency situation, requiring dredging the pass as soon as practicable; that in furtherance of this the Board directs the County Manager to obtain pricing information for this project from at least two prospective vendors, including any potential vendors with dredges already operating off the west coast of Florida,and that the County Manager negotiate and enter into an Agreement with the apparent low bidder,subject to ratification by the Board, preferably at the next Board meeting." The services requested by this Executive Summary are necessary for the dredging requested in Item 10-R. The public announcements and qualification procedures required by the Consultant's Competitive Negotiation Act do not apply"in cases of valid public emergencies certified by the agency head."Accordingly, this item is legally sufficient provided that the Board declared the emergency as requested in Item 10-R,and requires majority support for approval. —MK RECOMMENDATION:, That in furtherance of the Board's declared emergency for the dredging of Clam Pass and in accordance with Florida Statute 287.055 (3 (a) 1)and the Board's Purchasing Policy XXI and VA 3 and 4,the Board approves the PBSD staff initiated work orders to Turrell, Hall & Associates for $28,000 per Board approved contract 10-5571 and the surveying services related to Clam Pass to Agnoli, Barber per Board approved contract 09-5262; approves the purchase/work order to Humiston and Moore to complete the planning,permitting, engineering and construction phase services related to Clam Pass consistent with the terms and rates of contract 08- 5124;and approves all associated budget amendments. SUBMITTED BY: Commissioner Georgia Hiller,District 2 Attachments: 1 Mara,'Rail`&Associates Work Order 2. Executed Purchase Order,Proposal and Work Order to Agnoli,Barber and Brundage 3. Proposed Work Order for Humiston and Moore 4. Contract Terms and Rates 08-5124 Page 11 of 19 Page 12 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 12 of 19 WORK ORDER/PURCHASE ORDER# CONTRACT/110-5571 CLAM PASS JOINT COASTAL Plower AND INLET&BAY MANAGEMENT PLAN UPDATE January 3,2013 Tyrrell,Hall&Assoc,Inc.(THA)is pleased to provide this scope of work to Collier County via the Pelican Bays Services Division(PBSD). The purpose of this scope is to outline ine professiconal environmental permitting services to the PBSD for the dredging of Clam Pass. The work proposed will be conducted under Contract Number 10-5571 by THA and our subcontractor,Humiston and Moore Engineers. Based on recent telephone conversations with the federal penmtting agencies (USACE and FWS), our understanding is that a new permit application will need to be submitted to the USAGE with updated project conditions and further permit coordination may be regtnred with FWS to complete the Biological Opinion for the project. Scone of Work TASK I: PERMITTING a) Peru Drawn s: TEA,will coordinate updated permit drawings at t e direction of the Pelican Bay Services Division (PBSD) for the dredging of Clam Pass. The penult exhibits will be based on updated hydrograpbic and beach profile data to be couched in January 2013 and on the most recent benthic resources surveys conducted in August 2012. b) DEP P . . : H&M will coordinate with the staff of the DEP to update the existing DEP JCP permit(no.02960877-O01-JC)as needed with the updated . This will include filing of permit modification on behalf of Collier County and meeting with the DEP staff c) DEP 11 Zoo ,H&M will prepare and submit a mixing zone variance request to DEP for the proposed dredging activity. d) USAC ' •THA and R&M will coordinate with the staff of the USACE to complete their review of the project(No.0296087-001-IC)as needed based on the updated extra`bits. This will include filing a new permit application an behalf of Collier County, meetings with dm USACE sta$ and resprmses to commenting parties as a result of time new application. e) MirkandladaLgadjugm.THA will provide information to and coordinate with these agencies relative to their species and habitat guider.We will provide a technical review of the draft Biological Opinion from the FWS Mauling an engineering evaluation by R&M (under a separate scope) of the project design. Attendance at two meetings vultthese agarcles is included in the scope. Tur cell,Hall&Associates,Inc. Page 12 of 19 Page 13 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 13 of 19 The scope does not include provisions for pion of detailed environmental documents such as mitigation plans,Environmental Impact Statements,or Biological Assessments that could be requested by the re.viewing agencies based on the updated application. We do not anticipate these documents being requested now since they were not requested as part of th e previous applications but will still need to verify this owe the revised application has been submitted. TASK H: INLET AND BAY MANAGEMENT PLAN UPDATE Inlet and Bay Management Plan Update:THA and I3&M will prepare a the ftamework for an updated management plan for the Clam Pass and Bay system • H&M will prepare exhibits and supporting documentation relative to the design configuration of Clam Pass dredging for inclusion into the Plan. • THA will coordinate stakeholder input into the plan through three efforts. An initial call fbr written Input from stakeholders and interested parties will be used to determine goals and objectives for the Plan. A workshop will be held once the framework for the plan has been completed to collect written and oral comments. A final workshop will be held once the Plan has been drafted and prior to being finalized. • TEA will prepare documentation necessary for stakeholder input including initial invitation letter to participate,Plan outline,and Plan Draft • THA will coordinate with the State and Federal permftting and review agencies as needed during the formulation off the Plan. Baseline information already available will be incorporated into Plan elements however; additional field data collection(such as fish and bird surveys)is not included in this scope. This scope does not include services for responding to legal objections,preparing for expert testimony,or preparing for litigation associated with the project. if nec ►,these services will be provided unde r a separate agreement with the County. Schedule The above scope is based on a 75 day schedule. Creation of the permit exhibits and submittal of the updated application to the DEP and USACE will take place within 10 days of approval to proceed. Subsequent coordination with the permitting agencies will be done as quickly as possible based on the agency's review times and comment periods. Coordination of the Management Plan will be done concurrently with the pelting. The initial invitation to participate )be swat out within 7 days of the notice to proceed. Management Plan outline and preliminary exhibi July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 14 of 19 Bud&et Compensation for the above scope of work will be based on charges as described in Exhibit"A"and will not exceed the amount listed without approval from PBSD. .$28,000.00 Accepted By: .1 'e.— C,/revs, U3 !!!.3 T C.Hall,Vice President Date 'Farrell,Hall&Associates,Inc. dergfAr- • trAPPff Lakas4/0Pentionsi Date Pelican Bay Services Division Terrell,Hail&Associates,Inc. Page 14 of 19 Page 15 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 15 of 19 WORK ORDER/PURCHASE ORDER# CONTRACT#10-5571 CLAM PASS JOINT COASTAL PERMIT AND INLET&BAY MANAGEMENT PLAN UPDATE January 3,2013 Exhibit"A" Scope of Services: PERMITTING Task I a.—Permit Drawings .$2,350.00 Task I b.—DEP Permitting $2,500.00 Task I c.—DEP Mixing Zone Variance $1,300.00 Task I d.—USACE Permitting $6,000.00 Task I e.—USFWS and NMFS Coordination .$3,850.00 MANAGEMENT PLAN Task II—Inlet and Bay Management Plan Update $12,000.00 Total Services ..$28,000.00 Page 15 of 19 Page 16 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 16 of 19>,,,„„)_, TUREtELL, HALL & ASSOCIATES, INC. MARINE&ENVIRONMENTAL CONSULTING 3584 Exchange Avenue,Suite B•Naples,Florida 34104-3732•(239)643-0166•Fax(239)643-6632 MEMORANDUM TO: Susan O'Brien FROM: Tim Hall DATE: July 3,2013 RE: Management Plan Estimated Costs Susan, Per your request at the June 26, 2013 Clam Bay Subcommittee meeting, below is the written summary of the estimated costs I had outlined at the meeting. Items already collected/nrovided In the annual monitoring and reporting - Mangrove monitoring o 20 monitoring plots o Annual infrared aerial photo interpretation o Quarterly rooftop photographs o Flushing(hand dug)channel inspection and maintenance Seagrass monitoring o 9 Transects from Outer Clam Bay to Pass - Tidal and Hydrographic Monitoring and Survey - Water quality monitoring o PBSD monthly collection o Quarterly summary and annual report Items Identified for inclusion through the stakeholder input or required for document - Wildlife Surveys o Birds($2,000-$28,000) o Fish($9,000-$10,000)(Based on same survey as in 1995 Draft Inlet Management Plan) o Terrestrial(Gopher Tortoises,Mammals,etc)($5,000) - Engineering Backup(Justification for final dredge template)($30,000) - Document compilation,Write-up and Exhibits for Plan($35,000-$40,000) - Surveying($15,000) - Meetings($8,000-$10,000) Permitting -We are estimating a minimum value of$40,000 for the permitting but that could go much higher depending on final scope of the project,agency requests for additional information,or outside challenges to the permit. Page 16 of 10 Page 17 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 17 of 19 WORK ORDER Agreement for Fixed Term Environmental Biological Studies Dated April 26, 2011 (Contract #10-5571) This Work Order is for professional environmental consultant services for work known as Clam Bay Monitoring and Maintenance The work is specified in the proposal dated September 27, 2012, which is attached hereto and made a part of this Work Order. In accordance with the Terms and Conditions of the Agreement referenced above, Work Order is assigned to Turrell, Hall and Associates, Inc. Scope of Work: Task I - Annual Biological Monitoring Task II— Seagrass Monitoring Task III — Tidal Data Collection, Analysis and Hydrographic Reporting Task IV — Water Quality Data Coordination and Analysis Task V — Water Level Data Collection Task VI —Annual Report Preparation and Submital Task VII —Annual Report Presentation Task VIII — Hand Dug Channel Inspections and Maintenance IX - Additional consultant services; meeting attendance, site investigation and research field observation and reports. Schedule of Work: Complete work within 465 days from date of the Notice to Proceed authorizing start of work. Compensation: In accordance with Article Five of the Agreement, the County will compensate the Firm in accordance with the negotiated lump sum or time and material amount provided in the schedule below (if a task is time and material, so indicate and use the established hourly rate(s) as enumerated in Schedule "B" of the Agreement). (List all Tasks) Task I $ 22,250.00 (Lump Sum) Task II $ 4,680.00 (Lump Sum) Task III $ 28,750.00 (Lump Sum) Task IV $ 5,520.00 (Lump Sum) Task V $ 9,770.00 (Lump Sum) Task VI $ 11,215.00 (Lump Sum) Task VII $ 3,600.00 (Lump Sum) Task VIII $ 10,400.00 (Lump Sum) Task IX $ 15,000.00 (Time and Material) Reimbursables $ 1,000.00 TOTAL FEE $ 112,185.00 * *Above TOTAL FEE does not include an additional $10.000 for STORET data entry (and set-up costs) the PBSD Board authorized 12/5/2012. New Total Fee will be $122.185.00. Page 17 of 19 Page 18 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 18 of 19 Send all Invoices to: Collier County Board of County Commissioners Collier County Board of County Commissioners Purchasing Department Attn:Accounts Payable Phone:239-252-8407 3299 Tarnlaml Trl E Ste 700 Fax: 239.732-0844 Naples FL 34112-5749 Tax Exempt:85-8012621830C-2 OR email to:bcca rk m p pile �coitiercte rk.co Purchase Order number must appear on all related correspondence,shipping papers and Invoices: Vendor ft 103099 Purchase order PO Mon ber 4500139739 00010/05/2012 TURRELL HALL&ASSOCIATES INC STE B 3584 EXCHANGE AVE contact Person Pelican Bay Div NAPLES FL 34104 retero ooe 239-597-1749 Fs* 239-597-1749 Please deliver to: PELICAN BAY SERVICES DIVISION Delivery Date: 09/30/2013 STE 605 801 LAUREL OAK DR NAPLES FL 34108 Terms of Payment Net 30 Days Currency USD Main. WWI* Desrgrfptteat OrderQty Unit PrkePertlnk No t Vidue 00010 Task l Annual Biological Monitoring 22,250 each 1.00 22,250.00 Release order against contract 4800002834 Item 00010 00020 Task II Seagrass Monitoring 4,680 each 1.00 4,680.00 Release order against contract 4600002834 Item 00010 00030 Task III Tidal Data Collection 28.750 each 1.00 28,750.00 Release order against contract 4600002834 nem 00010 00040 Task N Water Quality Data Analysis 5,520 each 1.00 5,520.00 Release order against contract 4600002834 Item 00010 00050 Task V Water Level Data Collection 9,770 each 1.00 9,770.00 Release order against contract 4600002634 Item 00010 00060 Task VI Annual Report Preparation 11,215 each 1.00 11,215.00 Release order against contract 4600002834 item 00010 00070 Task Vii Annual Report Presentation 3,600 each 1.00 3,600.00 Release order against contract 4600002834 Item 00010 00080 Task VIII Hand Dug Channel Insp.&Mntc. 10,400 each 1.00 10,400.00 Release order against contract 4600002834 Item 00010 00090 Task IX Add!Consulting Services 15,000 each 1.00 15,000.00 Release order against contract 4800002834 Item 00010 VENDOR Terms and Conditions The VENDOR agrees to comply with all Purchase Order Terms and Conditions as outlined on the Collier County Purchasing Internet site: httpi/www.colllergov.net/Index.aspx?page=782(revision date 01t2212008).Including delivery and payment tents.Further the VENDOR agrees to: 1. Provide goods and services outlined In this Purchase Order with the prices,terms,delivery method and specifications listed above. 2. Notify department Immediately if order fulfillment cannot occur as specified. 3. Send all Invoices to: Collier County Board of County Commissioners Attn:Accounts Payable 3299 Tamiamt Td E Ste 700 Naples FL 34112-5749 OR email to:bccapderk lierderk.aom The Purchase Order Is authorized under direction of Collier County Board of County Commissioners by: Joanne Markiewlcz,General Services/Purchasing Director Printed 1211212012 a 14:00:10 320-183800-831400-51100.1 Page 1 or 2 Page 18 of 19 Page 19 of 358 July 16,2013 Clam Bay Committee of the Pelican Bay Services Division Board 2. Board of County Commissioners documents pertaining to approval of work order to update the Clam Bay Management Plan Page 19 of 19 Vendor it 103099 PO Number 4500139739 TURRELL HALL&ASSOCIATES INC Date 10/0512012 STE B 3584 EXCHANGE AVE NAPLES FL 34104 l item malarial Description Order Qty Unit Price Per Unit Net Value I 00100 Reimbursable Expenses 1,000 each 1.00 1,000.00 Release order against contract 4600002834 Item 00010 Total net value excl.tax USD 112,185.00 Printed Wed Dec 12 2012 14:00.10 GMT-0500 320-163600.631400-51100.1 Page 2.12 Page 19 of 19 Page 20 of 358 -77"74WIRMATI:4- ..s'=• CLAM: 14AY RESTORATION AND MANAGEMENT PLAN 1 Presented to COLLIER COUNTY; PELICAN BAY SERVICES DIVISION and WCI COMMUNITIES, L.P. July 8,1998 Contents: USACOE SECTION 404 PERMIT NO. 199602789(IP-CC) FDEP CONSOLIDATED JOINT COASTAL FE T, SOVERIGN SUBMERGED LANDS AUTHORIZATION AND VARIANCE NO. 0128463-0014C (Previously 113049919) -j • 1 .1 OR0910870 J 1 Page 21 of 358 . . . : . CLAM BAY RESTORATION AND MANAGEMENT PLAN Presented to COLLIER COUNTY; PELICAN BAY SERVICES DIVISION and WCI COMMUNITIES, L.P. July 8, 1998 Project Managers: i..' Ted R. Brown,Akerman,Senterfitt& Eidson, P.A. Hilburn 0. Hillestad, Ph.D. Consultants: Steve Means,Wilson,Miller, Barton & Peek, Inc. Dorthea Zysko,Wilson,Miller, Barton& Peek, Inc. David Tackney,Tackney&Associates, Inc. Robin Lewis, Lewis Environmental Services, Inc. Sam Snedaker, Ph.D., University of Miami T Mac Hatcher,Collier County Department of Natural Resource Protection Bill Lorenz, Collier County Department of Natural Resource Protection ° i Page 22 of 358 Page 23 of 358 4��ENNOVEfTION Department of FLOR A Environmental Protection Twin Towers Office Building Lawton Chiles 2600 Blair Stone Road Virginia B.Wetherell Governor Tallahassee, Florida 32399-2400 Secretary CONSOLIDATED JOINT COASTAL PERMIT AND SOVEREIGN SUBMERGED LANDS AUTHORIZATION 1 PERMITTEE/AUTHORIZED ENTITY: Permit/Authorization No.: 0128463-001-JC Collier County-Pelican Bay Services Div. (Previously 113049919) do Ted Brown, Esquire Date of Issue: July 06, 1998 Akerman, Senterfitt, &Edison,P.A. Expiration Date: July 06,2008 255 South Orange Avenue Orlando, Florida 32801 County: Collier Project: Clam Bay Restoration and • Long-Term Management This permit is issued under the authority of Chapter 161 and Part IV of Chapter 373,F.S., and Title 62, Florida Administrative Code (F.A.C.). The activity is not exempt from the requirement to obtain a Joint Coastal Permit. Pursuant to Operating Agreements executed between the Department and the water management districts, as referenced in Chapter 62-113, F.A.C., the Department is responsible for reviewing and taking final agency action on this activity. This permit also constitutes a finding of consistency with Florida's Coastal Zone Management Program, as required by Section 307 of the Coastal Management Act; and, certification compliance with water quality standards under Section 404 of the Clean Water Act, 33 U.S.C. 1344. This activity also requires a proprietary authorization, as the activity is located on sovereign submerged lands owned by the Board of Trustees of the Internal Improvement Trust Fund, pursuant to Article X, Section 11 of the Florida Constitution, and Sections 253.002 and 253.77,F.S. The activity is not exempt from the need to obtain a proprietary authorization. The Department has the responsibility to review and take final action on this request for proprietary authorization in accordance with Section 18-21.0051, and the Operating Agreements executed between the Department and the water.management districts, as referenced in Chapter 62-113, F.A.C. In addition to the above, this proprietary authorization has been reviewed in accordance with Chapter 253 and Chapter 258, F.S., Chapter 18-20, Chapter 18-21, and Section 62-343.075, F.A.C., and the policies of the Board of Trustees. As staff to the Board of Trustees, the Department has reviewed the activity described below, and has determined that the activity requires a Consent of Use for the use of those lands, 7'!rn= -!ivlrDlll??•O R': -r-,,; ,,,... '_- .. ..-- Page 24 of 358 Printed on recycled paper. FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 2 of 21 pursuant to Chapter 253.77,Florida Statutes. The Department hereby grants its Consent to the permittee to use the sovereign submerged lands for the activities authorized in this permit, provided all general and specific conditions, and monitoring requirements stipulated in the permit are met by the permittee. The above named permittee is hereby authorized to construct the work shown on the application and approved drawings, plans, and other documents attached hereto or on file with the Department and made a part hereof. This permit is subject to the limits,conditions, and locations of work shown in the attached drawings,and is also subject to the attached General Conditions,Specific Conditions, and Monitoring requirements which are a binding part of this permit. You are advised to read and understand these drawings and conditions prior to commencing the authorized activities, and to ensure the work is conducted in conformance with all the terms, conditions, and drawings. If you are utilizing a contractor,the contractor also should read and understand these drawings and conditions prior to commencing the authorized activities. Failure to comply with all drawings and conditions shall constitute grounds for revocation of the permit and appropriate enforcement action. The applicant has requested a variance (VE-11-726) from Rule 62-4.244(5),Florida Administrative Code (F.A.C.), which requires that a dredge and fill mixing zone be no more than 150 meters in radius from the point of discharge or source of pollution. The applicant has requested a mixing zone of up to 1,000 meters for the nearshore disposal of the beach quality material. The Department intends to grant this variance request per Chapters 403.201 and 403.938, Florida Statutes, and,Ch. 62-103.100, F.A.C. The requirements and conditions of Variance No. VE-11-726 are binding with this permit and shall become requirements and conditions of the permit. Activities authorized by this permit shall not commence until the Final Order granting Variance No. VE-11-726 has been issued by the Department. PROJECT DESCRIPTION: The project is to conduct activities to improve the hydrodynamics of, and thus restore and manage, the Clam Bay ecosystem by conducting the activities in association with and specified by the Clam Bay Restoration and Management Plan (CBRMP), which is attached to and made part of this permit as Attachment"A". The Permittee is authorized to implement the CBRMP as set forth therein. Specifically, but not by way of limitation, the Permittee is authorized to: dredge approximately 22,000 cubic yards of material from Clam Pass and restricted channels within the system; conduct periodic dredging of Clam Pass and the interior channels to maintain the design depths;conduct minor,small charge blasting of the restricted interior channels; replace three 24 inch diameter culverts along Seagate Drive with similar sized one-way flow to the north culverts; deposit the beach quality material on the beaches adjacent to Clam Pass and dispose of the fines on the uplands; kill and remove the nuisance exotic vegetation within the system; conduct studies to determine the sources for excess water discharge into the system from the developed uplands; formulate an Upland Water Discharge Reduction Plan with Page 25 of 358 FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 3 of 21 recommendations based on the results of the studies; and,implement the Upland Water Discharge Reduction Plan in accordance with its terms. PROJECT LOCATION: The project is located in the Clam Bay Natural Resource Protection Area and surrounding developments in Collier County, Sections 4, 5, 8,9, 32, &33 of Township 49 South,Range 25 East,Class II waters, not approved for shellfish harvesting. GENERAL CONDITIONS: 1. All activities authorized by this permit shall be implemented as set forth in the plans, specifications, and attached drawings approved as a part of this permit, and all conditions and requirements of this permit. The permittee shall notify the Department in writing of any anticipated deviation from the permit prior to implementation so that the Department can determine whether a modification of the permit is required. 2. If,for any reason, the permittee does not comply with any condition or limitation specified in this permit,the permittee shall immediately provide the Bureau of Beaches and Coastal Systems (Bureau) and the appropriate District office of the Department with a written report containing the following information: a description of and cause of noncompliance; and the period of noncompliance,including dates and times; or,if not corrected,the anticipated time the noncompliance is expected to continue, and steps being taken to reduce, eliminate, and prevent recurrence of the noncompliance. 3. This permit does not eliminate the necessity to obtain any other applicable licenses or permits which may be required by federal, state, local or special district laws and regulations. This permit is not a waiver or approval of any other Department permit or authorization that may be required for other aspects of the total project which are not addressed in this permit. 4. This permit conveys no title to land or water, does not constitute State recognition or acknowledgment of title, and does not constitute authority for the use of sovereignty land of Florida seaward of the mean high-water line, or, if established, the erosion control line, unless herein provided and the necessary title, lease, easement, or other form of consent authorizing the proposed use has been obtained from the State. The permittee is responsible for obtaining any necessary authorizations from the Board of Trustees of the Internal Improvement Trust Fund prior to commencing activity on sovereign lands or other state-owned lands. 5. Any delineation of the extent of a wetland or other surface water submitted as part of the permit application,including plans or other supporting documentation, shall not be considered specifically approved unless a specific condition of this permit or a formal determination under section 373.421(2), F.S., provides otherwise. Page 26 of 358 FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 4 of 21 6. This permit does not convey to the permittee or create in the permittee any property right, or any interest in real property,nor does it authorize any entrance upon or activities on property which is not owned or controlled by the permittee. The issuance of this permit does not convey any vested rights or any exclusive privileges. 7. This permit or a copy thereof, complete with all conditions, attachments, plans and specifications, modifications, and time extensions shall be kept at the work site of the permitted activity. The permittee shall require the contractor to review the complete permit prior to commencement of the activity authorized by this permit. 8. The permittee, by accepting this permit, specifically agrees to allow authorized Department personnel with proper identification and at reasonable times, access to the premises where the permitted activity is located or conducted for the purpose of ascertaining compliance with the terms of the permit and with the rules of the Department and to have access to and copy any records that must be kept under conditions of the permit;to inspect the facility,equipment, practices, or operations regulated or required under this permit; and to sample or monitor any substances or parameters at any location reasonably necessary to assure compliance with this permit or Department rules. Reasonable time may depend on the nature of the concern being investigated. 9. At least forty-eight(48) hours prior to commencement of activity authorized by this permit, the permittee shall submit to the Bureau and the appropriate District office of the Department a written notice of commencement of construction indicating the actual start date and the expected completion date. 10. If historical or archaeological artifacts are discovered at any time on the project site, the permittee shall immediately notify the State Historic Preservation Officer and the Bureau. 11. Within 30 days after completion of construction or completion of a subsequent maintenance event authorized by this permit, the permittee shall submit to the Bureau of Beaches and Coastal Systems and the appropriate District office of the Department a written statement of completion and certification by a licensed professional engineer registered in the state of Florida. This certification shall state that: all locations and elevations specified by the permit have been verified; the activities authorized by the permit have been performed in compliance with the plans and specifications approved as a part of the permit, and all conditions of the permit; or shall describe any deviations from the plans and specifications, and all conditions of the permit. When the completed activity differs substantially from the permitted plans, any substantial deviations shall be noted and explained on two copies of as-built drawings submitted to the Department. • Page 27 of 358 FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 5 of 21 SPECIFIC CONDITIONS: 1. Prior to commencement of the activities authorized by this permit, the permittee shall ensure the following activities are conducted and information provided: a) At least 30 days prior to each construction event, the permittee shall identify a qualified biologist/wetland scientist(s) familiar with ecosystems of Florida and submit their qualifications to the Department for approval. This individual will serve as the supervising scientist that oversees the biological components of this restoration project and will halt construction if he/she suspects that violations of the permit have occurred. b) At least 30 days prior to commencement of construction, the "Proposed Scope of Work" described in the Biological Monitoring section of this permit shall be submitted to the Department for approval. c) Prior to commencement of construction, the construction plans and bid documents showing the work area contemplated to be constructed shall be submitted to the Department to be verified/approved by Department staff. Excavation work authorized by this permit shall be administered in accordance with Specific Condition 1.(g) below. To the fullest extent possible,the smallest, lightest mechanized equipment and smallest work areas adequate to conduct the activities authorized by this permit shall be used to minimize adverse impacts to natural resources and the substrate where mangrove regeneration is encouraged. d) Prior to commencement of each dredging event authorized by this permit, a pre- construction conference'shall be held among the contractor, the owner or authorized agent, the wetland scientist(s), the marine turtle permit holder, the USFWS, and a staff representative of the Department to establish an understanding among the parties as to the items specified in the General and Specific conditions of the permit and the Monitoring requirements. At least 10 days advance notice shall be provided prior to conducting this meeting. e) The Permittee shall submit the project specifications as required under Specific Condition 1.(g) below to BPSM for review and approval relative to the project specifications' probable impacts on marine turtles. If the type of dredge proposed has the potential to adversely impact marine turtles as determined by BPSM staff, additional conditions to protect marine turtles may be required by the Department as part of this permit. 0 If blasting is proposed,a blasting plan shall be submitted to the Bureau of Beaches and Coastal Systems and the Bureau of Protected Species Management in Tallahassee for approval at least 30 days before the proposed blasting event. Additional conditions relating to the proposed blasting activities may be needed and added to this permit by the Department. Page 28 of 358 • FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 6 of 21 g)iAt least forty-five (45) days prior to the initial dredging event and any subsequent maintenance dredging event authorized by this permit, the permittee shall submit to the Department's Bureau of Beaches and Coastal Systems in Tallahassee detailed project specifications, including but not limited to plan view and cross section drawings, which detail the dredge and fill limits at the dredging and disposal sites, the method of construction and construction schedule, and a processing fee as specified by Rule 62B-49, F.A.C. Additionally,the work area of the authorized excavation shall be clearly marked in the field by the wetland scientist(s) to allow the Department staff to verify and approve the location of the excavation. The Department may request additional information as necessary in order to review each proposed dredging event. Written approval from the Bureau of Beaches and Coastal Systems in Tallahassee shall be obtained before proceeding with each dredging event. Department approval for individual dredging events may be contingent upon the permittee's acceptance of additional conditions, such as turbidity and/or water quality monitoring, which may be determined to be appropriate based on data submitted to the Department in support of a dredging request or upon the results of previous dredging. 2. The following conditions are required to minimize impacts to marine turtles: a) No construction,operation,transportation or storage of equipment or materials are authorized seaward of the dune crest during the marine turtle nesting season (May 1st through October 30). This includes dredging of the main pass and disposal of dredged material seaward of the dune crest,including the intertidal zone. The other activities landward of the dune crest may be conducted during the marine turtle nesting season provided the necessary measures are taken to protect marine turtles. b) Fill material placed on the beach shall be sand that is similar to that already existing at the beach site in both coloration and grain size. All such fill material shall be free of construction debris,rocks,other foreign matter and shall not contain, on average, greater than 10 percent fines (i.e. silt and clay)passing a No. 200 sieve and shall not contain coarse gravel or cobbles (exclusive of shell material)retained by a No. 4 sieve. c) Fill material shall not exceed a 10:1 horizontal to vertical slope and shall be placed below MHW. If fill disposal results in a barrier or depression in the beach profile that interferes with marine turtle nesting,the permittee shall be required to remove that feature upon request by the Department. d) Reports on all nesting activity is currently provided to the Department by Collier County Department of Natural Resource Protection. The Permittee shall ensure that the reports prepared by the Collier County Department of Natural Resource Protection shall include the collection of data specific to the project area for the initial nesting season following the Page 29 of 358 FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 7 of 21 completion of construction, and for a minimum of two additional nesting seasons,unless waived as herein provided. Monitoring during the additional seasons may be waived if the permittee can demonstrate that the fill material is no longer present in the project area,or that turtle nesting the first season post-construction was not adversely affected compared to an appropriate control area. Monitoring shall include daily surveys and any additional measures for turtle protection authorized by the Department. Reports shall be submitted to the Department in accordance with current protocols with the Collier County Department of Natural Resource Protection, but as soon as practicable after the completion of all monitoring activities, and shall include daily report sheets noting all activity,nesting success rates,hatching success of all relocated and in situ nests, and names of all personnel involved in nest surveys and relocation activities. All nesting surveys and nest relocations shall be conducted only by persons with prior experience and training in these activities and duly authorized to conduct such activities through a valid permit issued by the Department, Division of Marine Resources,pursuant to Florida Administrative Code Rule 62R-1. e) If heavy equipment is required to transport equipment or materials on the dry beach (above MHW),the path of the equipment will be tilled to 36" to avoid compaction impacts prior to the following nesting season. t) Visual surveys for escarpments or barriers along the project area shall be made immediately after completion of the project and prior to May 1 in any year that disposal of beach quality material iS placed on the beaches adjacent to Clam Pass unless inspection of the disposal area indicates that the dredged material has been removed by natural processes, in which case this permit condition shall not apply. Results of the surveys shall be faxed to the Bureau of Protected Species Management, (850)921-4369, prior to any action being taken. Escarpments that interfere with sea turtle nesting or that exceed 18 inches in height for a distance of 100 feet shall be leveled to the natural beach contour by May 1a`. The Department shall be contacted immediately if subsequent reformation of escarpments that can interfere with sea turtle nesting or that exceed 18 inches in height for a distance of 100 feet occurs during the nesting and hatching season to determine the appropriate action to be taken. In each year where the escarpment survey is conducted, a summary of the survey and actions taken shall be submitted to the Department. g) During the marine turtle nesting and hatching season, all lighting associated with project activities landward of the dune crest and visible from the beach shall be limited to the immediate area of active construction only. Such lighting shall be shielded low pressure sodium vapor lights to minimize illumination of the nesting beach and nearshore waters. h) In the event an unmarked marine turtle nest or a dead,injured, or sick marine turtle is discovered during construction activities, the marine turtle permit holder and the Bureau of Protected Species Management shall be notified immediately such that appropriate Page 30 of 358 • FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 8 of 21 conservation measures can be taken. 3. The following conditions are required to minimize impacts to manatees: a) The permittee shall instruct all personnel associated with the project of the potential presence of manatees and the need to avoid collisions with manatees. All construction personnel are responsible for observing water-related activities for the presence of manatee(s). b) The permittee shall advise all construction personnel that there are civil and criminal penalties for harming,harassing, or killing manatees which are protected under the Marine Mammal Protection Act of 1972, The Endangered Species Act of 1973, and the Florida Manatee Sanctuary Act. c) Siltation barriers,if used,shall be made of material in which manatees cannot become entangled, are properly secured, and are regularly monitored to avoid manatee entrapment. Barriers must not block manatee entry to or exit from essential habitat. d) All vessels associated with the construction project shall operate at "no wake/idle" speeds at all times while in the construction area and while in water where the draft of the vessel provides less than a four-foot clearance from the bottom. All vessels will follow routes of deep water whenever possible. e) If manatee(s)are seen within 100 yards of the active daily construction/dredging operation or vessel movement, all appropriate precautions shall be implemented to ensure protection of the manatee. These precautions shall include the operation of all moving equipment no closer than 50 feet of a manatee. Operation of any equipment closer than 50 feet to a manatee shall necessitate immediate shutdown of that equipment. Activities will not resume until the manatee(s)has departed the project area of its own volition. f) Any collision with and/or injury to a manatee shall be reported immediately to the Florida Marine Patrol at 1-800-DIAL FMP (1-800-342-5367). Collision and/or injury should also be reported to the U.S. Fish and Wildlife Service in Jacksonville(1-904-232- 2580)for north Florida or Vero Beach (1-407-562-3909) in south Florida. g) Temporary signs concerning manatees shall be posted prior to and during all construction/dredging activities. All signs are to be removed by the permittee upon completion of the project. A sign measuring at least 3 ft. by 4 ft. which reads Caution:Manatee Area will be posted in a location prominently visible to water { related construction crews. A second sign should be posted if vessels are associated with the construction, and should be placed visible to the vessel operator. The second Page 31 of 358 • FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 9 of 21 sign should be at least 8 1/2" by 11" which reads Caution:Manatee Habitat. Idle speed is required if operating a vessel in the construction area. All equipment must be shutdown if a manatee comes within 50 feet of operation. Any collision with and/or injury to a manatee shall be reported immediately to the Florida Marine Patrol at 1-800-DIAL FMP(1-800-342-5367). The U.S. Fish and Wildlife Service should also be contacted in Jacksonville (1-904-232-2580)for north Florida or in Vero Beach (1-407-562-3909)for south Florida. h) Permanent manatee informational signs, such as those shown in the enclosed example sheets,shall be installed and maintained at the canoe boat ramp at the southern end of Outer Clam Bay following completion of the initial dredging event. 4. Pursuant to the Florida Department of State, Division of Historical Resources (DOS-DHR) regulations, no heavy equipment, land clearing, or ground disturbing activities shall be allowed at sites 8CR476, WR547,and 8CR576, unless subjected to prior testing by a qualified archaeologist and approved by the DOS-DHR. See the attached permit drawings for the locations of these historically significant areas to be avoided. 5. The Clam Bay ecosystem contains waterways that are difficult to navigate due to shallow water depths and meandering channels lined with protruding mangrove branches and roots. To protect the significant natural resources and water quality of the Clam Bay ecosystem, and to provide protection to the public safety (boaters utilizing these waters), there shall be an idle speed/no wake restriction on motorized vessels used in the system (as stipulated in County Ordinance No. 96-16). The existing restrictions placed upon boating activities within the Clam Bay system by County Ordinance No. 96-16 shall remain active and enforceable for the life of this permit. Additionally, two Florida Marine Patrol approved signs that state,"Idle Speed-No Wake" and "Caution- Shallow Water and Natural Resources Present- Tilt Motor Up To Prevent Prop Dredge- Damage to Natural Resources Subject to Fines,Pursuant to Ch. 370, F.S." shall be placed at the following locations following completion of the initial dredging event: 1) One within the entrance of Clam Pass facing boaters entering the bays; 2) One at the entrance to Outer Clam Bay facing north and easily legible to boaters entering Outer Clam Bay; 3) One at the entrance to Inner Clam Bay facing south and easily legible to boaters entering Inner Clam Bay; 4) One at the entrance to Upper Clam Bay facing south and easily legible to boaters entering Upper Clam Bay; and, 5) One within the upper reaches of Outer Clam Bay facing southeast and easily legible to boaters leaving Seagate. 6. ' o protect the submerged natural resources (seagrasses and oyster beds) adjacent to the eh: nels to be dredged, weighted turbidity screens that extend to the bottom of the waterbody Page 32 of 358 FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 10 of 21 shall be installed between the natural resource and the dredge to effectively isolate the natural resource from the active dredge and prevent adverse impacts to the natural resource via suspended particle settlement. The turbidity screens will only need to be placed on the down current side between the natural resource and the dredge to assist the contractor in identifying the significant natural resource areas and to protect the natural resources from the dredge and temporarily elevated turbidity levels. 7. A minimal amount of trimming and removal of mangroves will be needed to conduct the authorized activities in the smaller interior channels. These activities are to be supervised by the Department approved wetlands scientist described in Specific Condition 1 above. To ensure that the biological health and productivity of the mangroves are not adversely impacted to a significant extent,the following mangrove trimming procedures must be followed, pursuant to Sections 403.9321-403.9333, Florida Statutes. Only once-per-year trimming of the mangroves needed to conduct the activities authorized by this permit, and to maintain the canoe trails is allowed; no trimming of mangroves to create or enhance views within this ecosystem is allowed. Prior to trimming or removing any mangroves, the species of the trees must be identified and tagged by a qualified biologist, wetland scientist(s), or botanist and verified by staff from the Department's South District Office in Ft. Myers, or the Bureau of Beaches and Coastal Systems in Tallahassee. All trimmed mangrove parts greater than one inch in diameter shall be removed and composted on the uplands to prevent further restriction of tidal flow within the interior channels: Live Mangrove Trimming Procedures a. Maximum Diameter- No white mangrove tree with a single trunk diameter greater than twelve inches dbh (diameter at breast height=the diameter of the tree at 4.5 feet above the substrate) may be top trimmed. No black mangrove tree with a single trunk diameter greater than eight inches dbh may be top trimmed. No red mangrove tree with a single trunk diameter greater than one inch may be top trimmed. b. Top Trimming-White and black mangrove trees within the specified trunk diameters may be trimmed to a height of four feet above substrate. The limit of top trimming for red mangroves within the specified trunk diameters is 6 linear feet above the substrate. Top trimming shall not occur from May 1 through September 30. No more than half of the canopy of the tree shall be trimmed. No white and black mangrove trees less than 4 linear feet in height shall be trimmed. No red mangroves less than 6 linear feet in height shall be trimmed. c. Removal of Lateral Branches- For white and black mangrove trees,lateral branches • originating between four and fifteen feet above the substrate may be removed from a trunk of any dbh. For red mangroves,up to fifty percent of the lateral branches originating between six and fifteen feet above the substrate may be removed. In multiple trunk trees, the trunk having the greatest dbh is designated as the primary trunk; others are designated as lateral branches. Page 33 of 358 • FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 11 of 21 d. General Prohibitions- 1) No herbicides or chemicals may be used to alter mangroves. 2) No burning may be used to alter mangroves. 3) No deliberate damage to prop roots, pneumatophores, and regular roots. 4) No cutting of any mangrove that serves as breeding, nesting, or roosting area for colonial water birds; or is used by endangered species, threatened species, and species of special concern for breeding, or which is routinely used, by endangered species, threatened species, or species of special concern, as listed in Rule 19-27, F.A.C., and 50 CFR 17.11-12; or contains a nest or nests of protected solitary nesting birds as defined in Rule 39-12.002 or 39-27.002, F.A.C.,except where a permit has been issued by the Florida Game and Fresh Water Fish Commission, or, where appropriate, the U.S. Fish and Wildlife Service, to remove the nest or nests. Dead Mangrove Trimming or Removal Procedures a. Due to the large numbers of dead mangroves within certain areas of this ecosystem, up to 50% of the dead trees may be removed within the areas of massive die-offs to facilitate recolonization by mangroves. b. For public safety, all dead mangroves within 20 feet of the existing paved roads may be removed. c. Prior to removing any dead mangroves, the trees shall be inspected and tagged for removal by the approved wetland scientist(s). Prior to their removal, these tagged trees shall be approved for removal by staff from the Department's South District Office in Ft. Myers, or from the Bureau of Beaches and Coastal Systems in Tallahassee. The larger, sturdier dead trees suitable for roosting and nesting shall remain. d. Dead mangroves approved for removal shall be removed at the substrate level with care not to damage or disturb surrounding, living vegetation. e. The removed dead trees shall be composted or disposed on the uplands to prevent further restrictions of tidal flow within the interior channels. 8. As part of the restoration and long-term management of this ecosystem, activities shall be conducted to remove the nuisance exotic vegetation (including Australian pine and Brazilian pepper) within the Clam Bay Natural Resource Protection Area. These activities shall be conducted with the goal in mind to remove all nuisance exotic vegetation from the area with the actual percentage of nuisance exotic vegetation not exceeding 1% of the total vegetated area. When removing the nuisance exotic vegetation, care shall be taken to not harm the surrounding native vegetation. Mechanical removal should remove as much of the roots of the exotic as possible followed by hand removal, or chemical treatment of any suckers. If chemical treatment is used, only environmentally safe chemicals,such as garlon and roundup, shall be used with special care taken to not spill/spray any in or on the water or native vegetation. Page 34 of 358 • FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 12 of 21 9. Within seven days of completion of the authorized activities (including the mangrove alterations, interior channel excavations, and removal of nuisance exotic vegetation) throughout the Clam Bay ecosystem,the contracted crews shall return to each work area and remove the trimmed branches and trees (dead trees approved for removal) greater than 1 inch in diameter to appropriate upland locations. The crews shall also regrade any spoil pile or berm that may have been created as part of the excavation work, such that there is no impediment to sheet flow and no created uplands as a result of the project. 10. Small charge explosives may be used to restore tidal flow in the interior channels where the use of mechanized and hand-held equipment is not feasible. The areas designated for the use of explosives shall be marked by the wetland scientist(s) and these marked areas shall be approved by Department staff prior to the use of the explosives. The explosives shall be carefully placed and detonated only in areas where their use will have minimal adverse impacts to significant natural resources. A Florida licensed explosives expert shall install and detonate all explosives associated with the project. 11. To develop a data set to understand the impact of freshwater discharge into the Clam Bay ecosystem from the developed uplands, the permittee shall submit detailed plans for the following primary studies within 120 days following permit issuance to the Department for approval. These studies are designed to identify existing water sources and water needs, and propose feasible methods to meet these water needs while concurrently reducing water discharges into the Clam Bay ecosystem (see the Clam Bay Restoration and Management Plan for the details and specifics of each study): Study 1- Vegetation Analysis/Irrigation Requirements; Study 2- Retarding Upland Water Flows into Clam Bay; Study 3- Reducing Flow from Perimeter Berm Area to Clam Bay; Study 4- Groundwater Flows; Study 5- Utilization of Stormwater Management Lakes as Source for Irrigation; and, any additional studies that may be needed to generate the information required to fully understand the impact of freshwater discharge into the Clam Bay ecosystem from the developed uplands. The study plans shall include detailed descriptions and maps, activities to be conducted, methods, and qualified personnel involved for each study. The permittee shall begin implementation of the Department approved studies within 180 days following permit issuance. 12. The permittee shall conduct the studies required by Specific Condition No. 11 for up to three years following permit issuance. However, if the data generated from the studies suggest that additional data gathering will not materially aid the permittee and the Department in understanding the impact of freshwater discharge into the Clam Bay ecosystem, the permittee may request the Department for authorization to terminate one or more of the studies and proceed to the analysis and recommendation phase as described in the CBRMP and this condition. Page 35 of 358 • FDEP Permit No.: 0128463-001-jC (Previously 113049919) Page 13 of 21 Following this study period, the permittee shall analyze the data gathered, formulate recommendations based on the data, and to the extent suggested by the data,design a plan to reduce water discharges into the Clam Bay ecosystem from the developed uplands ("Upland Water Discharge Reduction Plan" or UWDRP). If a UWDRP is required as a result of an analysis of the data by the permittee and the Department, then the permittee will submit to the Department's Bureau of Beaches and Coastal Systems in Tallahassee and the Department's South District Office in Ft. Myers the UWDRP for approval. Once the UWDRP is approved by the Department, the permittee shall implement the UWDRP as provided for therein, but in no event later than five years following permit issuance unless a modification or waiver of that time frame is agreed to by the permittee and the Department. The implemented activities to reduce upland discharge of water shall be monitored in accordance with the terms of the UWDRP following completion of their implementation. It is anticipated that all activities described here and in Section 4.5.4 of the CBRMP will be completed within the ten (10) year permit term,but nothing will preclude the Department with the consent of the permittee,from extending the time for implementation of any portion of the UWDRP if the interest of the ecology of the system would be improved by doing so. The permittee will, as suggested in the CBRMP,implement in connection with this permit a program of community involvement to help ensure the maximum amount of community participation possible should the studies described in the CBRMP, and required here, suggest the need for one or more UWDRPs. In this context, the Department recognizes that the decision to require one or more UWDRPs will be dependent on the outcome of the studies described in the CBRMP and required here. The following time-table summarizes the anticipated schedule for the activities associated with the studies required above: ACTIVITY SCHEDULE 1. Submit detailed plans of each primary Within 120 days from permit issuance study to the Department for approval. (anticipated to be October 22. 1998). 2. Begin implementation of the approved Within 180 days from permit issuance primary studies. (anticipated to be December 22, 1998). 3. Conduct the primary studies and gather For up to 3 years following permit issuance data. (anticipated to be July 22, 2001). 4. Develop as required by the data one or UWDRPs shall be submitted by April 22, more "Upland Water Discharge 2003, to the FDEP and will be implemented Reduction Plan" based upon results/ in accordance with their terms. recommendations of primary studies and submit to Department for approval. Page 36 of 358 FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 14 of 21 5. Implementation and monitoring of the To be completed within the permit term. "Upland Water Discharge Reduction Plan". 6. Submission of monitoring report for the To be submitted in accordance with the term "Upland Water Discharge Reduction of the UWDRPs. Plan" that includes any noted modifications or corrective actions needed. 13. The permittee shall conduct the studies, gather the information, and submit the reports stipulated in the"Monitoring Required" section of this permit. If the monitoring reveals adverse impacts have occurred as a result of conducting the authorized activities, the permittee shall cooperate with the Department to develop and implement such remedial/contigency plans as may be desirable to effectuate the purposes of this permit. The Permittee shall not be liable for damages or costs resulting from adverse impacts to the ecosystem unless those adverse impacts are a direct and proximate result of the intentional or negligent act(s) of the Permittee in the implementation of the activities authorized by the permit. MONITORING REQUIRED: 1. Water Quality Monitoring Turbidity monitoring during dredging and discharge, and as necessary prior to the removal of turbidity control devices. A. Dredge Site Frequency: Twice daily, at least four hours apart, beginning at least two hours after dredging begins and continuing during the dredging activities. Location: Background: At least 200 meters upstream of the project site outside of any visible turbidity plume, at mid-depth. Compliance: Downstream of the turbidity curtains which separate the dredge from the natural resources on the resource side of the curtains. When the natural resources are more than 150 meters downcurrent of the dredge,the compliance zone shall be no more than 150 meters downcurrent of the dredge within the densest portion of any visible turbidity plume, at mid-depth. Page 37 of 358 FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 15 of 21 B. Disposal Sites Frequency: Twice daily, at least four hours apart, beginning at least two hours after dredging begins and continuing during the dredging activities. Location: Background: At least 200 meters upstream of the project site (in the nearshore zone of the Gulf of Mexico) outside of any visible turbidity plume, at mid-depth. Compliance: At no more than 1,000 meters downstream of the discharge point in the intertidal zone(between the mean high and mean low water lines) and 61 meters (200 feet) offshore (from the mean low water line), within the densest portion of any visible turbidity plume, at mid-depth. All monitoring data shall be submitted within one week of analysis with documents containing the following information: (1) permit number; (2) dates of sampling and analysis; (3) a statement describing the methods used in collection, handling, storage and analysis of the samples; (4) a map indicating the sampling locations; and (5) a statement by the individual responsible for implementation of the sampling program concerning the authenticity, precision, limits of detection and accuracy of the data. Monitoring reports shall also include the following information for each sample that is taken: (a) time of day samples taken; (b) tidal stage and direction of flow (c) depth of water body; (d) depth of sample; and (e) antecedent weather conditions. The compliance locations given above shall be considered the limits of the temporary mixing zone for turbidity allowed during construction. If monitoring reveals turbidity levels at the compliance sites greater than 29 NTUs above background turbidity levels at the corresponding background sites,construction activities shall cease immediately and not resume until corrective measures have been taken and turbidity has returned to acceptable levels. Any such occurrence shall also be immediately reported to the Department's office in Ft. Myers. Monitoring reports shall be submitted to the Department's office in Tallahassee and to the South District Office in Ft. Myers. Failure to submit reports in a timely manner constitutes grounds for revocation of the permit. When submitting this information to the Department please clearly include, at the top of each page or as a cover page to the submittal: "This information being Page 38 of 358 • • FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 16 of 21 provided in partial fulfillment of the monitoring requirements in Permit No. 0128463-001- JC (Previously 113049919)." 2. Hydrographic Monitoring To generate the data needed to adequately assess the potential impacts of opening up the restricted channels of the interconnected waterways as authorized by this permit,the hydrographic monitoring program shall include the following: a. Topographic surveys of Clam Pass and surrounding 500 feet zone. The surveys shall be conducted immediately prior to and following completion of the authorized excavation. Additional surveys of Clam Pass shall be required as often as the permittee seeks to conduct maintenance excavation within Clam Pass or the main channel excavated pursuant to this permit and identified in the CBRMP as Cuts 4A, 4B, 4C, and 4D. In such circumstances, the survey produced shall meet the standards set forth in paragraph `B" below. b. Within seven(7) days of completion of the authorized excavation of the interior channels, and thereafter as frequently as may be required for the duration of the permit, the enhanced interior channels shall be surveyed at a minimum of 100 feet cross-sections to ensure that the desired elevations have been attained. It is anticipated that these surveys will be initiated as and when it appears to the Permittee and its wetland scientist(s)that maintenance excavation of these channels may be required to maintain the integrity of the system. A copy of the survey,certified by a registered land surveyor,shall be submitted to the Department as a part of a request for authority to conduct maintenance excavation pursuant to Specific Condition 1.(g) above,or if the survey reveals no present need for additional excavation, it will nonetheless be submitted to the Department as additional data within thirty (30) days of completion of the excavation. Any survey submitted pursuant to this section shall contain a note, based upon the surveyor's examination of the excavated area which indicates whether the surveyed cross-sections reasonably reflect the site conditions for the entire area excavated. c. The permittee shall submit an engineering report and survey maps summarizing the monitoring data and project performance to the Bureau within 90 days of completion of each survey. The report shall include an analysis of the sediment characteristics of Clam Pass and any changes observed in the pass, identify erosion and accretion patterns along the pass and adjacent beaches, and identify any adverse impacts which would be attributable to the activities authorized by this permit. If survey data of the pass is submitted it should be submitted on 3.5-inch high density floppy disk in an ASCII format and the data shall be arranged according to the FDEP/DBS specifications so as to include all of the information required by the FDEP/DBS specifications. Page 39 of 358 • FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 17 of 21 d. Monitoring stations shall be established at representative sites (as shown on the permit drawings as reflected in the CBRMP) throughout Upper, Inner, and Outer Clam Bay to record the following hydrological parameters: 1) time of day samples taken; 2) water temperature (°C and°F); 3) depth of water body; 4) depth of sample; 5) antecedent weather conditions; 6) water quality, including salinity, silicates, nitrites, total organic carbon, chlorophyll, phaeophytin, pH,conductivity, dissolved oxygen, total phosphorus, nitrate,nitrate ammonia, total kjeldahl nitrogen, and total dissolved solids; 7) sedimentation levels; 8) rainfall; 9) tidal stage and direction of flow; 10) other influential flows, such as groundwater and stormwater flows; • 11) wind direction and velocity; and, 12) identification of the sample location which corresponds to the number shown on sampling location maps. These analyses shall be made immediately prior to and following construction, and monthly thereafter, with the exception of the water quality analysis (number 6 above), which may be conducted on a quarterly basis. Staff gages shall be installed at these stations in order to measure the relative tide range at each station. In order to measure the effect of the dredging on the tidal range, one station should be located adjacent to or within the degraded mangrove area. This station should be equipped with a tide gage capable of continuous readings of tide stage. The monitoring required by this section (e.) will provide valuable data concerning the effects the restoration project is expected to have on the hydrology of the Clam Bay ecosystem. This information is crucial for future management decisions for this important natural resource, therefore, this monitoring shall continue for the life of the permit. The data collected from this monitoring shall be listed, analyzed, and submitted to the Department in annual Hydrographic Monitoring Reports. 3. Biological Monitoring As required in Specific Condition 1.b), at least 30 days prior to commencement of construction, the permittee shall provide a"Proposed Scope of Work(PSOW)" from the Department approved wetland scientist(s), or from another qualified environmental organization with experience conducting research on Florida's ecosystems. The PSOW will include a list of scientifically accepted methods that will be conducted, and when, and by whom, to adequately assess the Clam Bay ecosystem (with a primary focus on the mangrove and seagrass communities) before and after the activities authorized by this permit are conducted. The PSOW shall include the Page 40 of 358 • FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 18 of 21 following information plus any additional information or scientific methods deemed appropriate by the contracted scientists: a. Flight-dated aerial photography of the Clam Bay ecosystem before and after the activities authorized by this permit are conducted. The aerials shall be taken during July of each year and submitted to the Department annually for the duration of the permit. The aerials must be color, vertical aerial photographs,controlled and rectified at a scale appropriate' for post-production digitilization and a scale sufficient to delineate differing habitat zones and dominant species within each zone. The flight line shall include all of the Clam Bay Natural Resource Protection Area and the nearshore zone to at least 400 feet offshore (from the mean high water line). b. As concurrently as possible with taking the aerial photographs, ground-truthing activities shall be conducted in areas of special concern within the Clam Bay ecosystem, including areas of widespread dead and dying mangroves, Inner, Upper, and Outer Clam Bays, the areas receiving water discharges from the uplands, and areas contiguous with the main pass. The ground-truthing activities shall include the use of the latest accepted scientific methods to survey the types of habitats of concern within the Clam Bay ecosystem, including mangrove and seagrass dominated habitats. These surveys shall include a listing of species present, percent coverages by species, size ranges and averages, and overall health/biological trends for each fixed quadrat, transect, or plot studied.. These surveys and any associated drawings/mapping shall be conducted prior to conducting the dredging activities and once each year (in July)thereafter for the life of the permit. c. Annual biological monitoring reports (BMRs) shall be submitted beginning one year following permit issuance. The first annual BMR shall contain the time-zero conditions of the Clam Bay ecosystem existing prior to commencement of the permitted activities and a progress report of the activities conducted since permit issuance. Thereafter, each BMR shall contain a progress report of the activities completed since the previous BMR and all the data collected pursuant to a. and b. above. Each BMR shall include graphical representation and overlays of the collected data on computer generated drawings of the aerials, and ground-level color panoramic photos of each study area at fixed stations. The annual BMRs shall also contain an analysis of the collected data and make conclusions and recommendations concerning the impacts the permitted activities have had on the Clam Bay ecosystem based on the analysis of the data collected, including the biological monitoring data, the hydrographic monitoring data, and the water quality monitoring data. MONITORING SUMMARY: Turbidity monitoring during construction; hydrographic/water quality monitoring of Clam Pass, the interior waterbodies,the adjacent beaches, and the Seagate culverts; biological monitoring associated with marine turtle and manatee protection; and, long-term biological monitoring of the Clam Bay ecosystem via fixed vegetative and benthic surveys. li Page 41 of 358 FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 19 of 21 COMPLIANCE TRACKING SUMMARY: - Commencement of Activity Notice- Due at least 48 hours prior to commencement of activity, per General Condition 9. -Project Completion and Certification -Due within 30 days following subsequent dredging events from a Florida registered engineer, per General Condition 11. - Preconstruction Conference- At least 10 days prior to commencement of activity,per Specific Condition 1.d). - Marine Turtle Monitoring Reports- Reports due annually that include compaction measurements,escarpment survey results, and daily survey results, per Specific Condition 2. - Written Dredging Requests- At least 45 days prior to each event per Specific Condition 1.g). - Mangrove Tagging Verification by Department Staff- Must be done prior to trimming or removing any mangroves, per Specific Condition 7. - Study Plans- Due within 120 days following permit issuance, per Specific Condition 11. - Upland Water Discharge Reduction Plan-Due within 3 years following permit issuance,per Specific Condition 12. - Turbidity Monitoring Reports-To be conducted twice daily during construction and submitted weekly, per Monitoring Required section. - Water Quality Monitoring Reports-Due annually, per Monitoring Required section. - Hydrographic Monitoring Reports- Due annually, per Monitoring Required section. - Biological Monitoring Reports- Due annually, per Monitoring Required section. AGENCY COMMENTS: Florida Department of Community Affairs- May 23, 1997- No objections. Florida Department of State-Division of Historical Resources- June 23, 1997- Provided specific conditions to protect potentially historic sites 8CR476, 8CR547, and 8CR576. City of Naples- July 8, 1997- Supports the project. PARTIES REQUESTING NOTICE: Mangrove Action Group, Inc. Save the Bays Association. Inc. The Conservancy of Southwest Florida Page 42 of 358 FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 20 of 21 Executed in Tallahassee, Florida. STATE OF FLORIDA DEPARTMENT OF ENVIRONMENTAL PROTECTION Kirby B. een Deputy Secretary Copies furnished to: Bob Brandy,Bureau of Beaches and Coastal Systems Jon Iglehart, DEP- South District Office- Ft. Myers Kalani Cairns,U.S. Fish and Wildlife Service George Percy, Fl. Dept. of State Keri Akers, Fl. Dept. of Community Affairs Andreas Mager, U.S. Dept. of Commerce Susan Gray, SFWMD Stacey Cowley, DEP, Office of General Counsel Estus Whitfield, Governor's Office of Environmental Affairs Chip Clough, U.S. Army Corps of Engineers Mac Hatcher,Collier County Government Collier County- Pelican Bay Services Division David Guggenheim,The Conservancy of SW Florida Dan Spina, Save the Bays,Association Kay Potter, Mangrove Action Group, Inc. Hilburn Hillestad, Environmental Consultant-Arvida Dorothea Zysko,Wilson,Miller,Barton&Peek,Inc. Karen Moody, DEP- Bureau of Protected Species Management John Iliff,National Marine Fisheries Service Eric Staats, Naples Daily News John Mac'kie, Becker &Poliakoff,P.A. Permit Information Center Page 43 of 358 FDEP Permit No.: 0128463-001-JC (Previously 113049919) Page 21 of 21 FILING AND ACKNOWLEDGMENT FILED, on this date, pursuant to Section 120.52,Florida Statutes,with the designat d Department Clerk, receipt of which is hereby acknowledged. 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I, .:'.• ------ 1,S II :i...N. • .....• , = I.. i• •• ." ..•• • . ; 1 il ...All '•••••-1 .. ' a: '241*•••..••••••••• • • I 1''. 2•• : n.7. ; • • .. / 'If I ,••••____...• • . 14 .. ' • r‘ , i 1 :i" ,.,....1 • .„ y.:..ii, ,..,...t.1.----: ca.17.5Wx•Ii.,•; `" ! ;•----z-gq. . ; ::„• ,._____...c. - . '.."', \ . ' ' i I . 1 ; . •• • II.1 ', . i i j)OW'''. L'' :`.--`0...' . .1.44%.......--a-, -.--F-'---1 II JUL: c1 - - 1997 ! ,i'...:...i..,:sf&:.---;•,:''.... .. .. . 1r. . .• • 1 . • ••••••: .. _ \ • i• - - --fstlit AU OF AE.2..3 .,.. ., .-.:%,;.::;$-,-;,:•§....-. :: .'" _ .. ,i .." I.:, e a C ,:;)..•1 ' :.-;'. .•.:.li'•";f ke.,Ifi."44.:: :',•••••.;.:•3,11..'. ••.: II :i :: '11.1 P I ." FAS,„„ t--._-,= ' , • 14...,..,,, :•:. -..„.2.3........, ...... ••_ .•. ® • 14 toA9-rAr SYSTE1V •,. '■a. t 1: ' ' 1 •:.......f■ - ' ' 17..../L..:•.%."4 . . .•. 1= . - • ... ,.... ', ' ••••• L' -.I a 2 -7-. .7 '..-41; ,,.."*\,, : . .,.-.... i. . ,....4.,_ 1,..... , ,_ ...... , .. . i• - • • 4• , i i • . t, I. .• .. t l% ..r ', • Ill:Like. .....L.;,,Z=.••••erics,„....... Page 45 of 358 • 1 . . . jo • 1 ,,....0= '• ....- - • %... ' "'"I 1 1. 1 a..134% S....-..." \-:: - ■;:f • 7- ... A---4 S117:.0.....,. ... . • •.• 1.--ts5 LI1 -.• ..:: - : --, 'c . - - - • SLER 0818 PERMANENT MANATEE SIGNS INSTALLATION PROCEDURES • -. •�' :it) • �( •0;g- �•ea X 4 3.. '•a• • • 1 -ter �v,. "�'J ..`•�' There are two types of manatee signs that may be required, 1)."Caution Manatee Area"; and 2) "Manatee Informational Displays" (see attached examples). The typical Manatee Informational Displays include two signs: a"Manatee Fact Sheet" and"Basics for Boaters". These signs are intended to increase the awareness of boaters of the presence of manatees in the area and of the potential threat boats pose to the animals. Custom- designed signs are allowable if the basic specifications and information are comparable, but must be approved by the Department. These signs are non-regulatory in nature. Procedure for Approval: 1. The applicant should forward a project site plan, with the type and locations for signs to the Bureau of Protected Species Management, Department of Environmental Protection, 3900 Commonwealth Boulevard, Mail Station 245, Tallahassee, Florida 32399. The applicant should also include a chart indicating the location of the facility in relation to waterways and county location, and the Permit and/or Lease number associated with the .project: 2. The Bureau of Protected Species Management will review the proposed site sign plan. The applicant will be notified within 30 days if the signs and locations proposed by the applicant are unacceptable. Correspondence will be sent to offer suggestions on the type, number and locations of sign(s). If the applicant has not received a response within 30 days, the proposed signs and their locations should be considered approved. 3. If during a site visit, approved signs and their locations are'found not to be in accordance with the instructions given ih this'document, failure to follow these directions may require relocation or addition of signs RECEIVED 1995. FEB 1 S ATTACHMENT - March 15, 1995 Page 46 of 358 SUB LANDS&ENV.RES. Attachment t, Page 1 SLER 0818 PERMANENT MANATEE SIGNS INSTALLATION PROCEDURES (continued) Instructions for location and types: FACILITY TYPE/SIZE SIGN REQUIREMENT Private, Commercial, or Public facility No Signs Required <10 wet or dry slips, for permanent mooring Private, Commercial, or Public Facility Manatee Informational Displays with 5 or more slips for temporary mooring (in association with upland service restaurants, charters, etc.) Private, Commercial, or Public facility Caution Manatee Area Signs Required ,; with 10-19 wet, dry, temporary or permanent slips Private, Commercial, or Public facility Caution Manatee Area Signs with >20 slips (wet, dry, temporary or and Manatee Informational Displays permanent) Boat Ramp, Private or Public Manatee Informational Displays Manatee Informational Displays must be located in a prominent location, such as near walkways, dockmaster offices, restrooms or foot traffic access points to piers/docks for maximum visibility. Caution Manatee Signs for docking facilities should be placed on land, walkways or docks. These signs should be oriented so that the boaters using this facility will be reminded to watch for manatees while boating. These signs are not required to be placed in view for the general boating public. If a facility has separate docks with separate access walkways, a Caution Manatee Sign should be installed near each walkway or dock. Permanent manatee signs should not be installed on pilings in water, or be attached to navigational markers, or in any way impede navigation. RECEIVED R . FEB 15 1996 SUB LANDS&ENV.RES. ATTACHMENT - March 15, 1995 T7' Page 47 of 358 Attachmen , D, Page 2 • SLER 0818 INSTALLATION REQUIREMENTS for Permanent Manatee Signs (continued) Approved Sign Supplierst Both types of signs are available through the companies listed below and may also be available from other local suppliers throughout the state. Permit/lease holders, marinas, and boat docking/launching facilities should contact sign companies directly to arrange for shipping and billing. Caution and Informational Signs: Cape Coral Signs & Designs Inc. JADCO Signing Inc. 1311 Del Prado Boulevard 708 Commerce Way Cape Coral, Florida 33990 Post Office Box 911 1-800-813-9992 Jupiter, Florida 33458 813-772-9992 1-800-432-3404 FAX 813-772-9992 407-747-1065 FAX 407-744-2985 Municipal Supply and Sign Company Information Signs (only) Post Office Box 17 New City Sign Company Naples, Florida 33939-1765 2245 Central Avenue 1-800-329-5366 St. Petersburg, FL 33713 813-262-4639 813-323-7897 FAX 813-262-4645 FAX 813-323-1897 • e.J E ' r RECEIVED r FFR 1 5 1996 !! SUB LANDS&ENV.RES. tjA • Page 48 of 358 K ATTACHMENT - March 15, 1995 Attachment D, Page 3 I . SLER 0818 . - . • • r . . • - • MANATEE BASICS L I . WEST INDIAN . . . • FOR BOATERS • MANATEE FACT SHEET : .• . .. .,...::,....,..,.......„..,,,,,...,,,,,r,.:x,5,...,:g.,...ri: . .:.q.:.:4.,." • • E_ , 11..4,•!*.r.s.ta::,..:,...4.4.0, :1.::zIA:;.::::::.: . - • rzagnArratt +0,4...6..1..... , . . 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L 1::• %-...,..m 4.:2,1',‘,4•• .....:.t"%:::::;,:,..:5.:-.R.4.- it.,• ..:W :"*.:.:. ••-,00‘4 32:Vg2,....2'V.tb,,._.,..... :.:,......2 -g,90;•:.-1:0A-n•-''...$• g...••••A •• .4.- . ....iti„.... ....,...,,,, ti -9.4..M.A5'77.17..*--....H.'"Ittgrea-**:"."1:)..1:r.. ..,' 1--r*....,..K0,..,.:,-..goa.z.....4.z...?......:•::::,.• •••.". .-4.s.'•-•'.'N'''''r..a .:::?;*.: i . .11141Vart-4053.if...0.1::;:niMtIti)1:i.#0&...,,,'•:.P.:.*... '..t.,W....,51 ax.k,:!,.:IffieV:t2kok:0....a.:"..c.P.,:-:•.:,:ff,..ligt s-:!'•::'*ii,",?'..•:',W •..4,....e.4 Li ' 0.0.:..).,w,m4war.0,:mr.pommx. y..,A1 ;-......#.;.--- .. t.k . ristawavaterismemmr.avati.i6...:,;; 6.,?1,4 i ) 1 4.*i„:::-.:: .,:.;::ri-3,,,.:•:,;:::-.: :,...., . , 2 4.:'''''"''''"':;::::;.;,..:,•::•::.,.:;::,:::.,,,•:::i::•,-,•'-• . • ' •,$i.-,., •1 ;.;" - :2-* • • 2... I 1 ...,-.'::::•:7:::.;.;'.;;.-.7,1:::f-,,,:::::-;:2;;Ii•Si,;,..2 7.77:....:., • ! • 1 1 jf 2.2,•,••••:'.2-.1..."..tir....70,5;,*'..:-..:4:W::::.:,..'V.74:-:.!..Y::..:;.?:,•••••'. t.-. . ,...;;;Ot,:,..5:;:et... •.:.;',.:,n.t..?:4::-.47--•• i ..k:-.,, LY - • ; ?:• % P • 1 . RECEIVED 1 4 t • :5.:.: it: .41,1,. & /1 4'.> SUB LANDS&ENV.RES. ::4 ;. FEB 15 19% * , /2:-4 ::::"'t• .. ^"...'.ft;• .% . l ..,* *;14. :.`f ,i4.:... :4. %.7 / ! k .....................— .... . 1 Caution Manatee Area 11 Page 49 of 358 ATTACHMENT - March 15, 1995 Attachment D, Page 4 DEPARTMENT OF ENVIRONMENTAL PROTECTION STATE OF FLORIDA In the Matter of an Application for Joint Coastal Permit/Water Quality Certification, Request for Variance, and Authorization to Use Sovereign Submerged Lands by: APPLICANT: PROJECT NAME: Clam Bay Restoration and Collier County-Pelican Bay Services Div. Long-Term Management do Ted Brown,Esq. Akerman, Senterfitt, &Edison,P.A. File No: 0128463-001-JC 255 Orange Avenue County: Collier Orlando, Florida 32801 CONSOLIDATED NOTICE OF INTENT TO ISSUE JOINT COASTAL PERMIT, CONSENT OF USE TO USE SOVEREIGN SUBMERGED LANDS, AND VARIANCE The Department of Environmental Protection gives consolidated notice of its intent to: (a) issue a joint coastal permit under Chapter 161 and Part IV of Chapter 373, Florida Statutes (F.S.),and Title 62,Florida Administrative Code (F.A.C.) (draft copy of permit attached). Issuance of the joint coastal permit also constitutes certification of compliance with state water quality standards pursuant to Section 404 of the Clean Water Act, 33 U.S.C. 1344; (b) grant a consent to use sovereign submerged lands for the proposed activity,under Article X, Section 11 of the Florida Constitution,Chapter 253,F.S.,Title 18,F.A.C., and the policies of the Board of Trustees,as described,below subject to any fees or special conditions in the attached draft permit; and, (c) issue a variance(FDEP Variance No. VE-11-726) from Rule 62-4.244(5),Florida r ' Administrative Code(F.A.C.),which requires that a dredge and fill mixing zone be no more than 150 meters in radius from the point of discharge or source of pollution. Issuance of the joint coastal permit also constitutes a finding of consistency with Florida's Coastal Zone Management Program,as required by Section 307 of the Coastal Management Act. Page 50 of 358 Consolidated Notice of Intent to Issue Collier County-Pelican Bay Services Division File No. 0128463-001-JC (Previously 113049919) Page 2 of 14 I. DESCRIPTION OF THE PROPOSED ACTIVITY The applicant,Collier County- Pelican Bay Services Division, applied on April 21, 1997, to the Department of Environmental Protection for a 10 year permit/water quality certification/ authorization to use sovereign submerged lands owned by the Board of Trustees of the Internal Improvement Trust Fund(Board of Trustees) to implement the Clam Bay Restoration and Management Plan(CBRMP) to restore approximately 568 acres of mangrove estuarine ecosystem (known as the Clam Bay Natural Resource Protection Area). The project consists of enhancing the hydrology of the system by periodically dredging sediments(up to 22,000 cubic yards)constricting the pass and interior waterbodies,placing the beach quality material on the beaches adjacent to Clam Pass, disposing the fine material on the uplands,replacing the three existing culverts on Seagate Drive with new, one-way flow to the north culverts, removing nuisance exotic vegetation,performing minor mangrove trimming,conducting small charge blasting to open the restricted interior channels,and implementing studies and programs to identify and reduce the amount of stormwater discharge into the Natural Resource Protection Area. The beach quality material will be placed onto the beaches adjacent to Clam Pass between DEP monuments R-35 south to R-50. The applicant has also requested a variance from Rule 62-4.244(5), F.A.C.,which stipulates that dredge and fill mixing zones shall not exceed 150 meters in radius from the point of generation of turbidity (the dredge site and discharge site for this project). The applicant has applied for a variance from this provision to allow up to a 1,000 meter mixing zone parallel to shore for the disposal of the beach quality material in the intertidal zone. The project is located in the Clam Bay Natural Resource Protection Area and surrounding developments in Collier County, Sections 4, 5, 8,9,32,&33 of Township 49 South,Range 25 East,Class II waters,not approved for shellfish harvesting . The activity includes consideration of an application for a Consent of Use to conduct dredge and fill activities in sovereignty submerged lands of the State of Florida,and to replace three existing culverts in the same location within a City of Naples public easement(Seagate Drive culverts). II. AUTHORITY FOR REVIEW The Department has permitting authority under Part IV of Chapter 373 and Chapter 161, F.S., and Chapters 62B-41, 62B-49, 62-330, 62-341 and 62-343,F.A.C. The activity is not exempt from the requirement to obtain a joint coastal permit. Pursuant to Operating Agreements executed between the Department and the water management districts, as referenced in Chapter 62-113,F.A.C.,the Department is responsible for reviewing this application. Page 51 of 358 _ I Consolidated Notice of Intent to Issue Collier County-Pelican Bay Services Division File No. 0128463-001-JC (Previously 113049919) Page 3 of 14 The activity also requires a proprietary authorization,as it is located on sovereign submerged lands owned by the Board of Trustees of the Internal Improvement Trust Fund. The activity is not exempt from the need to obtain a proprietary authorization. Pursuant to Article X, Section 11 of the Florida Constitution, Sections 253.002 and 253.77, F.S., Sections 18-21.0040, 18-21.0051,and 62-343.075,F.A.C.,the policies of the Board of Trustees, and the Operating Agreements executed between the Department and the water management districts, as referenced in Chapter 62-113,F.A.C., the Department has the responsibility to review and take final action on this request for proprietary authorization. The applicant has requested a variance from Rule 62-4.244(5),F.A.C.,to allow up to a 1,000 meter mixing zone from the point of discharge of the dredged material into the intertidal disposal zone. The Department has the responsibility to review and take final action on this variance request per Chapters 403.201 and 403.938,Florida Statutes. III. BACKGROUND Previous permits have been issued by the Department to maintain Clam Pass in an open condition,to control elevated water levels within Upper and Inner Clam Bays, and to attempt to stop the abnormally high mortality rate of mangroves occurring in the estuarine system (DEP Permit Numbers CO-578, 112870025,and 112859039). Permit Number CO-578, a two-year permit issued in 1996, authorized the temporary usage of two portable pumps to control water elevations within Upper and Inner Clam Bays. Permit number 112870025,issued May 1, 1996, authorized the shallow dredging (using blasting and hand-digging) of 1,312 linear feet of main tidal channels and 356 feet of minor tidal channels in Upper Clam Bay to enhance the tidal prism/hydrology in areas where mangroves are dying. This work was completed on December 6, 1996, and according to the February 1997 Monitoring Report, appears to have enhanced the tidal prism/hydrology within the immediate vicinity. Permit no. 112859039 was issued in 1995 and modified by the Department in 1996, 1997, and 1998 to allow maintenance dredging of up to 9,000 cu.yds. of material within the main pass in a continual effort to keep the pass open. The applicant,Collier County- Pelican Bay Services Division,applied on April 21, 1997, to consolidate all the authorized and pending activities into the CBRMP and one joint coastal permit to authorize the restoration and management of the Clam Bay Natural Resource Protection Area over the life of a 10 year permit. The proposal to install the overflow structures was dropped as part of the current submittal, which proposes to conduct activities to improve the hydrodynamics of, and thus restore, the Clam Bay system by: dredging approximately 22,000 cubic yards of material from restricted channels within the system; conducting periodic maintenance dredging of the main pass and interior channels; replacing three 24 inch diameter culverts along Seagate Drive with similar sized one-way flow to the north culverts; depositing Page 52 of 358 -. Consolidated Notice of Intent to Issue Collier County-Pelican Bay Services Division File No. 0128463-001-JC (Previously 113049919) Page 4 of 14 the beach quality material (approximately 10,000-14,000 cubic yards) on the beaches adjacent to Clam Pass and disposing the fines on the uplands; removing or killing nuisance exotic vegetation within the system; conducting studies to determine the sources of and corrective actions for the excess freshwater discharge into the system; developing an Upland Water Discharge Reduction Plan;and, implementing the plan based on the recommendations of the studies to reduce the volume of water being discharged into the system from developed areas on the contiguous uplands. The Clam Bay watershed covers approximately 3,000 acres, of which approximately t ` 2,000 acres is developed. Historically,there was a natural connection to Vanderbilt Lagoon at the northern end of Upper Clam Bay. This connection was blocked in the 1950's with the construction of Vanderbilt Beach Road. A single culvert installed here ceased to function in the 70's. Also,historically,there was a natural connection at the southern reaches of the system linking Venetian Bay to Outer Clam Bay. This connection was blocked in the 60's by the r construction of Seagate Drive. Three culverts were installed here in 1976. These culverts are functioning today with limited capacity. Pelican Bay,a resort coastal community,was permitted and constructed in the late 70's. These blockages of the historic,natural connections and conversions of natural areas to developed areas have contributed to the increased rate of shoaling and frequent need for dredging to keep Clam Pass in an open condition. The hydrological characteristics of the Clam Bay system include an average annual rainfall of 53 inches for the region. An additional estimated equivalent of 26 inches is being R ° discharged into the Clam Bay Natural Resource Protection Area via treated stormwater discharge 4,t from the developed uplands. Natural surface and groundwater drainage is towards the Clam Pass system,connected bays, and the Gulf of Mexico. The water levels within Upper and Inner Clam Bays are usually 3-12 inches higher than the Gulf of Mexico(even at ordinary high tides) due to several restrictions that have developed in the form of sedimentation,shoaling,and deposition of organic debris combined with the additional discharge of freshwater into the system from the stormwater management systems of the developed uplands. The typical tidal range is less than 5 inches in Upper and Inner Clam Bays compared to the greater than 2 feet tidal range normally occurring in Clam Pass. Clam Pass is so constricted that Outer Clam Bay,which is only 3,000 feet away from the pass,has a tidal range of less than 1 foot. Only 20-25% of the tidal exchange for Outer Clam Bay is provided by the Seagate culverts with the majority of water flowing through the culverts remaining in the upper reaches just sloshing back and forth between Outer Clam Bay and Venetian Bay. Clam Pass has most recently been dredged in April of 1996,in February of 1997,and again in April of 1998 (DEP Permit Number 112870025) . The trend over the past few years has been the need to dredge Clam Pass at least on a yearly basis to keep it in an open,free-flowing condition. This need for frequent,costly dredging is expected to continue unless activities are conducted to improve the tidal flow needed to keep the pass open(Tackney, g 1996). 'k 7� Page 53 of 358 _, Consolidated Notice of Intent to Issue Collier County.Pelican Bay Services Division i File No. 0128463-001-JC (Previously 113049919) Page 5 of 14 In the Gulf of Mexico, the surf zone adjacent to Clam Pass can be characterized as an unvegetated, sandy substrate to approximately 200 feet offshore (from the mean high water line). Very productive hardbottom with up to 5 ft. relief is reported to begin between 200-300 feet offshore and extends Gulfward. This zone consists of large areas of hardbottom that are covered by many species of sponges,soft corals,tunicates, gorgonians,and marine macro-algae. The hardbottom provides a very important foundation for a biologically productive marine ecosystem as evidenced by the numerous species of living organisms observed in this zone (Turrell& 1-1 Associates, Inc.,July 1995). The Clam Bay Natural Resource Protection Area is characterized as a coastal mangrove -, estuarine ecosystem vegetated by all three species of mangroves native to Florida,white mangroves (Laguncularia racemosa), black mangroves (Avicennia germinans), and red mangroves (Rhizophora mangle)with black mangroves being the most prevalent. The Clam Bay system has approximately 568 acres of jurisdictional wetlands, of which approximately 443 acres J;; are mangroves, 124 acres are open water,and about 1 acre is cattail (Typha spp.)marsh. There are approximately 7 acres of seagrasses(Cuban shoal grass-Halodule wrightii) in Outer Clam r Bay and some small isolated patches near the mouth of the pass. Small patches of remnant oyster beds can be observed in the bays. There are a few small patches of nuisance exotic vegetation throughout the system including, approximately 1 acre of Australian Pine(Casuarina equistifolia)and approximately 3 acres of Brazilian pepper(Schinus terebinthifolius)according - to a report from Collier County Environmental Services Division, 1994,and as verified by field observations of the site from Department staff in 1996 and 1997. Collier County is currently ' implementing a nuisance exotic vegetation removal program to eradicate Australian pine. r ; There is an increasing rate of mangrove mortality within the Clam Bay system as indicated by aerial photos and numerous field observations. Aerial photos indicate that prior to the development of the uplands in the late 70's, large-scale areas of dead mangroves were t, virtually non-existent. In 1978,a study conducted by Tropical Biolndustries Co. and Gee and Jenson found that 8.8 acres of the trees were dead within the black mangrove dominated forests in the interior of the system. By 1996, that figure had increased to approximately 50 acres of F 1 dead mangroves with an additional 50 acres stressed and/or dying. The majority of the dead or dying-mangroves are black mangroves which are most susceptible to actually drowning by excessive inundation of their roots (pneumatophores) that protrude from the soils surrounding the tree. The tree begins to die when the pneumatophores are completely submerged with stagnant water for periods longer than 24 hours (Scholander, 1955; Mckee, 1993 & 1995). The pneumatophores of the mangroves were submerged for up to a month in the early 90's due to 1 j above average rainfall amounts and freshwater discharges into the system from the upland development coupled with restricted tidal flow in the interior channels and Clam Pass. Additionally,chemical analysis of the soils in the mangrove die-off areas indicate high levels of `i hydrogen sulfide and low dissolved oxygen levels,two conditions indicative of stagnant water Page 54 of 358 Consolidated Notice of Intent to Issue Collier County-Pelican Bay Services Division File No. 0128463-001-iC (Previously 113049919) Page 6 of 14 accumulating toxins and contributing to the stressing and killing of the mangroves (McKee, 1995). On-going water quality monitoring data submitted by Collier County Environmental Services and Pelican Bay Services District does not indicate the presence of excessive chemicals or nutrients in concentrations high enough to solely cause the mangrove mortality. Rather,the data shows that the death of the mangroves is attributable to a combination of factors, including excessive freshwater input into the system from the developed uplands and inadequate drainage/ tidal exchange from constricted channels resulting in water becoming elevated and stagnated above the pneumatophores of the mangroves for lethally long periods of time (McKee, 1995 and Hatcher, 1994). Sediment grain-size analysis conducted by Law Engineering and Environmental Services, Inc. in February 1997, and historical data generated from previous dredging activities to keep Clam Pass open indicate that approximately two-thirds(10,000-14,000 cubic yards) of the total material proposed to be dredged(22,000 cubic yards) is beach quality in size, texture,and color. The material that is not beach compatible is primarily found in the bays and interior channels of the mangroves. This material consists largely of mangrove detritus and other organics in a fine, dark sediment matrix. The material that is not beach compatible will be deposited on the uplands landward of the marine turtle nesting beach. Unvegetated areas and areas with nuisance exotic vegetation have been targeted for this disposal. An unvegetated area immediately south of the pass has been determined by Department staff to be suitable to bury the non-beach compatible material provided the area is capped with at least 2 feet of the native soil and any remaining beach quality material from the area of excavation is placed on the adjacent beaches. The Clam Bay area was subjected to a cultural resources assessment survey in 1989. Seventeen archaeologically significant sites were identified in the region with three located within the area of the activities proposed by this project. These three areas are listed as 8CR476, 8CR547,and 8CR576. The Florida Department of State(DOS)- Division of Historical Resources has indicated no objections to the project provided the three archaeologically significant areas are avoided(DOS letter dated June 23, 1997). IV. BASIS OF ISSUANCE A. General Basis for Issuance The primary benefit expected from the proposed project is the enhancement/restoration of the ecosystem by improving the tidal flow/hydrology of the estuarine system. Approximately 568 acres of wetlands,including 443 acres of mangroves are expected to benefit from the project through enhanced/restored tidal flow/hydrology. By conducting the proposed activities,it is 1 Page 55 of 358 Consolidated Notice of Intent to Issue Collier County-Pelican Bay Services Division r File No. 0128463-001-JC (Previously 113049919) Page 7 of 14 estimated that the super-elevated water levels within Inner and Upper Clam Bays will be lowered to acceptable levels to support mangrove recolonization. An additional benefit of the project includes the contribution of beach quality sand to an eroding public beach. This will improve the recreational beach that is currently available to the public in Southwest Florida and it will replace valuable beach needed by the endangered marine turtles known to nest in the area. The applicant has agreed to conduct the proposed activities seaward of the dune crest(the marine turtle nesting beach) outside of the marine turtle nesting season (May 15`to October 31S`)to avoid adverse impacts to marine turtles. Specific conditions will be included in the permit to provide protection to endangered marine turtles and manatees. An additional benefit expected from the project is an improvement in water quality throughout the Clam Bay ecosystem. By opening the constricted channels and tidal creeks, improved tidal flow and flushing of the entire system is expected,thus enhancing water quality. Additionally, by installing the one-way flow culverts at Seagate Drive,water quality of both Outer Clam Bay and Venetian Bay to the south is expected to be improved. Currently there is two-way flow between the bays and hydrographic studies indicate that this is contributing-to a lengthy lag time in tidal flows as the water between these two lagoons simply sloshes back and forth through the existing culverts. By installing the one-way flow culverts,the incoming flood tide will flow north into Outer Clam Bay forcing cleaner saltwater into Venetian Bay. The tide- flex valves would then close on the outgoing ebb tide forcing the water to flow out of Outer Clam Bay and through Clam Pass improving the water quality in Outer Clam Bay and aiding in keeping Clam Pass in an open condition. Tidal calculations indicate that with the installation of the one-way flow culverts, Outer Clam Bay will flush in 7-10 days and Clam Pass will need maintenance dredging less frequently to keep it in the open condition needed to sustain the biological vitality of the ecosystem and alleviate stressors upon living organisms within the ecosystem induced by encroaching development and lethally high water levels and freshwater input(Tackney, 1996). Additional engineering calculations were conducted to assess potential impacts to the Venetian Bay and Doctor's Pass systems to the south of the connecting culverts on Seagate Drive. These calculations show that installation of the one-way flow culverts will have minimal and insignificant effects on the existing hydrological characteristics of these waterbodies I and installation of the culverts is not expected to contribute to adverse shoaling within or adjacent to Doctor's Pass(Crawford, 1997). El • Specific Conditions and monitoring will also be included in the permit to provide protection to the existing natural resources within the Clam Bay system including the seagrasses, oyster beds, and mangroves. The channels, areas to be dredged,and spoil disposal sites have all been selected in areas to minimize adverse impacts to existing natural resources. Some minor unavoidable adverse impacts will occur during the dredging process including the loss of 9 approximately 0.31 acre of seagrasses and some minor, non-lethal trimming of mangrove roots and branches. The seagrasses may recolonize and the minor trimming of the mangroves is not Page 56 of 358 Consolidated Notice of Intent to Issue Collier County- Pelican Bay Services Division r File No. 0128463-001-JC (Previously 113049919) Page 8of14 expected to have a major effect on the health of the trees or their biological productivity. To ensure that the health and productivity of the mangroves are not adversely impacted,specific i_ conditions are included in the permit establishing guidelines for the mangrove trimming that are consistent with the requirements in Sections 403.9321-403.9333,Florida Statutes. The adverse impacts to the environment have been minimized. This project is a restoration project and it is expected that the benefits to the entire mangrove dominated ecosystem will far outweigh the minimal adverse impacts identified. Specifically, approximately 568 acres of wetlands,including 443 acres of mangroves,will be enhanced/restored by the project with only 0.31 of an acre of adverse impacts to seagrasses. Therefore, the project is considered to be self-mitigating and no further mitigation is required. The beach disposal of the beach quality material will be in the intertidal zone of the adjacent beaches, pursuant to Chapter 161,F.S. The mixing zone for dredge and fill activities in this area cannot exceed 150 meters,pursuant to Rule 62-4.244(5),F.A.C. The beach disposal could cause elevated turbidity beyond the edge of a 150 meter mixing zone originating from the - point of discharge of the dredged material in the intertidal zone. Accordingly, the applicant has requested a variance from Rule 62-4.244(5), F.A.C., to allow up to a 1,000 meter mixing zone parallel to shore in the intertidal zone. There is no practicable means known to further minimize the mixing zone and the potential for elevated turbidity given the grain-size analysis of the dredged material and considering hydrodynamic processes in the intertidal zone at the beach nourishment site. Since ;.. there are no significant natural resources within the intertidal zone and within 200 feet offshore, a variance from the mixing zone requirement will be granted to allow up to a 1,000 meter mixing zone parallel with the shoreline. There will be a restriction of the mixing zone to not extend beyond 200 feet offshore (from the mean low water line)to avoid adverse impacts to the biologically productive hardbottom areas existing beyond the nearshore zone. Turbidity will be • monitored during the beach disposal work to ensure compliance within these limits and specific conditions will be included in the permit to ensure that turbidity will not be elevated above 29 nephelometric units outside the 1,000 meter mixing zone. . The permit will not be valid until and unless the Department issues a final order authorizing a variance from the above-referenced rule. The variance is temporary and shall only be valid during the beach disposal of dredged material activities accomplished under the requirements of and during,the term of the permit and shall be subject to all monitoring conditions required by the permit. Lt Page 57 of 358 Consolidated Notice of Intent to Issue Collier County-Pelican Bay Services Division File No. 0128463-001-JC (Previously 113049919) Page 9 of 14 B. Specific Regulatory Basis for Issuance • Through the above and based on the general/limiting and specific conditions to the permit, the applicant has provided affirmative reasonable assurance that the construction and operation of the activity, considering the direct, secondary and cumulative impacts, will comply with the provisions of Chapter 161 and Part IV of Chapter 373,F.S., and the rules adopted thereunder,including the Conditions for Issuance or Additional Conditions for Issuance, pursuant r to Part IV of Chapter 373,F.S.,Chapter 62-330 and Sections 40D-4.301 and 40D-4.302, F.A.C. I The construction and operation of the activity will not result in violations of water quality standards set forth in Chapters 62-3, 62-4, 62-302, 62-520, 62-522 and 62-550, F.A.C. The applicant has also demonstrated that the construction of the activity, including a consideration of the direct, secondary, and cumulative impacts,is not contrary to the public interest. C. Specific Proprietary Basis for Issuance Through the above and based on the general/limiting and specific conditions to the { consent of use, the applicant has met all applicable requirements for proprietary authorizations to use sovereign submerged lands, pursuant to Article X, Section 11 of the Florida Constitution, Chapters 253, F.S., associated rule 18-21 F.A.C., and the policies of the Board of Trustees. The applicant has provided reasonable assurance that the activity: (1) is not contrary to the public interest; (2) will maintain essentially natural conditions; (3) will not cause adverse impacts to fish and wildlife resources or public recreation or navigation;and, (4) will not interfere with the riparian rights of adjacent property owners. • In addition,the project is consistent with the goals and objectives of the "Conceptual State Lands Management Plan" adopted by the Board of Trustees on March 17, 1981. V. PUBLICATION OF NOTICE 1 - The Department has determined that the proposed activity, because of its size,potential • effect on the environment or the public,controversial nature,or location,is likely to have a Fj heightened public concern or likelihood of request for administrative proceedings. Therefore, pursuant to Section 62B-49.005 (8),F.A.C.,you(the applicant) are required to publish at your own expense the enclosed notice of this Consolidated Notice of Intent to Issue. The notice shall be published one time only within 30 days, in the legal ad section of a newspaper of general circulation in the area affected. For the purpose of this rule, "publication in a newspaper of general circulation in the area affected" means publication in a newspaper meeting the • requirements of Sections 50.011 and 50.031, F.S., in the county where the activity is to take place. Page 58 of 358 Consolidated Notice of Intent to Issue Collier County-Pelican Bay Services Division File No. 0128463-001-JC (Previously 113049919) Page 10 of 14 The applicant shall provide proof of publication to: Department of Environmental Protection Bureau of Beaches and Coastal Systems 3900 Commonwealth Blvd., Mail Station 300 Tallahassee, Florida 32399-3000 The proof of publication shall be provided to the above address within seven days of publication. Failure to publish the notice and provide proof of publication within the allotted time shall be grounds for denial of the permit and easement to use sovereign submerged lands. VI. RIGHTS OF AFFECTED PARTIES . The Department will issue the permit(draft permit attached) unless a timely petition for _1 an administrative hearing is filed pursuant to sections 120.569 and 120.57 of the Florida Statutes, or all parties reach a written agreement on mediation as an alternative remedy under section 120.573 before the deadline for filing a petition. Choosing mediation will not adversely affect the right to a hearing if mediation does not result in a settlement. The procedures for petitioning for a hearing are set forth below, followed by the procedures for pursuing mediation. A person whose substantial interests are affected by the Department's proposed permitting decision may petition for an administrative hearing in accordance with sections 120.569 and 120.57 of the Florida Statutes. The petition must contain the information set forth below and must be filed (received)in the office of General Counsel of the Department at 3900 Commonwealth Boulevard,Mail Station 35,Tallahassee, Florida 32399-3000. Petitions filed by the permit applicant or any of the parties listed below must be filed within fourteen days of receipt of this notice of intent. Petitions filed by any other person must be filed within fourteen days of publication of the public notice or within fourteen days of receipt of this notice of intent of intent,whichever occurs first. A petitioner must mail a copy of the petition to the applicant at the address indicated above, at the time of filing. The failure of any person to file a petition(or a request for mediation, as discussed below) within the appropriate time period shall constitute a waiver of that person's right to request an administrative determination (hearing) under sections 120.569 and 120.57 of the Florida Statutes,or to intervene in this proceeding and participate as a party to it. Any subsequent intervention will be only at the discretion of the presiding officer upon the filing of a motion in compliance with rule 28-5.207 of the Florida Administrative Code. A petition must contain the following information: (a) The name,address, and telephone number of each petitioner,the applicant's name and address,the Department Permit File Number, and the county in which the project is °,s proposed; Page 59 of 358 L . Consolidated Notice of Intent to Issue Collier County-Pelican Bay Services Division File No. 0128463-001-JC (Previously 113049919) Page 11 of 14 (b) A statement of how and when each petitioner received notice of the Department's action or proposed action; (c) A statement of how each petitioner's substantial interest are affected by the Department's action or proposed action; (d) A statement of the material facts disputed by the petitioner, if any; (e) A statement of the facts that the petitioner contends warrant reversal or modification of the Department's action or proposed action; (f) A statement identifying the rules or statutes that the petitioner contends require reversal or modification of the Department's action or proposed action; and (g) A statement of the relief sought by the petitioner,stating precisely the action that the petitioner wants the Department to take with respect to the action or proposed action addressed in this notice of intent. Because the administrative hearing process is designed to formulate final agency action, ti the filing of a petition means that the Department's final action may be different from the position taken by it in this notice of intent. Persons whose substantial interests will be affected by any ' such final decision of the Department on the application have the right to petition to become a party to the proceeding, in accordance with the requirement set forth above. Any person may elect to pursue mediation by reaching a mediation agreement with all parties to the proceeding(which include the applicant,the Department, and any person who has filed a timely and sufficient petition for a hearing)and by showing how the substantial interests of each mediating party are affected by the Department's action or proposed action. The agreement must be filed in(received by) the Office of General Counsel of the Department at 3900 Commonwealth Boulevard,Mail Station 35,Tallahassee,Florida 32399-3000,by the same deadline as set forth above for the filing of a petition. The agreement to mediate must include the following: (a) The names,addresses, and telephone numbers of any persons who may attend the mediation; -(b) The name, address,and telephone number of the mediator selected by the parties,or a - provision for selecting a mediator within a specified time; (c) The agreed allocation of the costs and fees associated with the mediation; (d) The agreement of the parties on the confidentiality of discussions and documents introduced during mediation; (e) The date,time and place of the first mediation session, or a deadline for holding the first session,if no mediator has yet been chosen; (f) The name of each party's representative who shall have authority to settle or recommend settlement; (g) Either an explanation of how the substantial interests of each mediating party will be affected by the action or proposed action addressed in this notice of intent or a Page 60 of 358 Consolidated Notice of Intent to Issue Collier County-Pelican Bay Services Division File No. 0128463-001-JC (Previously 113049919) Page 12 of 14 statement clearly identifying the petition for hearing that each party has already filed, and incorporating it by reference; and (h) The signatures of all parties or their authorized representatives. As provided in section 120.573 of the Florida Statutes, the timely agreement of all parties to mediate will toll the time limitation imposed by sections 120.569 and 120.57 for requesting and holding an administrative hearing. Unless otherwise agreed by the parties, the mediation must be concluded within sixty days of the execution of the agreement. If mediation results in settlement of the administrative dispute,the Department must enter a final order incorporating the agreement of the parties. Persons whose substantial interests will be affected by such a modified final decision of the Department have a right to petition for a hearing only in accordance with the requirements for such petitions set forth above, and must therefore file their petitions within fourteen days of receipt of this notice of intent. If mediation terminates without settlement of the dispute,the Department shall notify all parties in writing that the administrative hearing processes under sections 120.569 and 120.57 remain available for disposition of the dispute,and the notice will specify the deadlines that then will apply for challenging the agency action and electing remedies under those two statutes. A party to this proceeding has the right to request review of this order's consistency with section 161.041,F.S.,by the Governor and Cabinet,sitting as the Land and Water Adjudicatory Commission,in accordance with Chapter 42-2,Florida Administrative Code, and specifically Rule 42-2.0131,Florida Administrative Code. To initiate such a review,your request must be filed within twenty(20)days of the date of this order with the Secretary of the Commission at Florida Land and Water Adjudicatory Commission,The Capitol,Room 2105,Tallahassee, Florida 32399-0001. A copy of the request must also be served on both the Department of Environmental Protection,Agency Clerk, 3900 Commonwealth Boulevard, Mail Station 35, Tallahassee,Florida 32399,and on any person named in this order,within 20 days from the date of this order if the request for review is to be effective. ; • Executed in Tallahassee,Florida. STATE OF FLORIDA DEPARTMENT OF ENVIRONMENTAL PROTECTION • Aor 4- Alfre• B.Devereaux,Jr.,Chief ' 1 Bureau of Beaches and Coastal Systems Page 61 of 358 Consolidated Notice of Intent to Issue Collier County-Pelican Bay Services Division File No. 0128463-001-JC (Previously 113049919) Page 13 of 14 • Recommended and written by Rich Bray with valuable input from Ilene Barnett, Bob Brantly, Keith Mille, and Karen Moody. Copies furnished to: Bob Brantly,Bureau of Beaches and Coastal Systems Jon Iglehart, DEP-South District Office-Ft. Myers Kalani Cairns,U.S. Fish and Wildlife Service George Percy,Fl.Dept. of State Keri Akers,Fl.Dept. of Community Affairs Andreas Mager,U.S. Dept. of Commerce Susan Gray, SFWMD Stacey Cowley,DEP, Office of General Counsel Estus Whitfield, Governor's Office of Environmental Affairs Chip Clough, U.S. Army Corps of Engineers Mac Hatcher,Collier County Government Collier County- Pelican Bay Services Division David Guggenheim,The Conservancy of SW Florida Dan Spina, Save the Bays,Association Kay Potter, Mangrove Action Group,Inc. Hilburn Hillestad, Environmental Consultant-Arvida Dorothea Zysko, Wilson,Miller,Barton& Peek,Inc. Karen Moody,DEP- Bureau of Protected Species Management John Riff, National Marine Fisheries Service Eric Staats, Naples Daily News John Mac'kie,Becker&Poliakoff,P.A. Permit Information Center FILING AND ACKNOWLEDGMENT FILED, on this date with the designated Department Clerk,pursuant to 120.52(11), • Florida Statutes, ceipt of which is hereby acknowledged. anatia., ov-ed Deputy Clerk D to 'c r. Page 62 of 358 - Consolidated Notice of Intent to Issue Collier County-Pelican Bay Services Division File No. 0128463-001-JC (Previously 113049919) Page 14 of 14 References 1. Crawford, Robert. 1997. Assessment of the Impact of the Proposed Flow Control Valves of the Seagate Drive Culverts. 2. Hatcher,James. 1994, 1996, and 1997. Collier County Environmental Services Division Publication Number NR-SP-94-01. 3. McKee, Karen. 1993 and 1995. Soil Physicochemical Patterns and Mangrove Species Distribution. Ecology 81:477-487. 4. Scholander,P.F. 1955. Gas Exchange in the Roots of Mangroves. American Journal of Botany 42:92-98. 5. Tackney,David. 1996. Studies conducted in association with the long-term management plan for the Clam Bay System. 6. Tropical Biolndustries Company and Gee&Jenson Engineering, Inc. 1978. Carbon Flows in Portions of the Clam Pass Estuarine System. 7. Turrell&Associates,Inc. 1995. Clam Pass Inlet Management Plan. ; i-P 1 Page 63 of 358 Naples Daily News . Naples, FL 33940 • Affidavit of Publication Naples Daily News . AKERMAN, SENTERFITT & EDISON, P.A. 255 S ORANGE AVE PO BOX 231 r-- ORLANDO FL 32802-6610 REFERENCE: 054739 F 57705361 STATE OF FLORIDA DEP • State of Florida County of Collier Before the undersigned authority, personally appeared B. Lamb, who on oath says that she serves as the Assistant Corporate Secretary of the Naples Daily News, a daily newspaper published at Naples, in Collier County, Florida: that the attached ' copy of advertising was published in said newspaper on dates listed. Affiant further says that the said Naples Daily News is a newspaper published at Naples, in said Collier County, Florida, and that the said newspaper has heretofore been continuously la published in said Collier County, Florida, each day and has been entered as second class mail matter at the post office in Naples, in said . Collier County, Florida, for a period of 1 year next preceding the first publication of the . attached copy of advertisement; and affiant further says that she has neither paid nor promised any person, firm or coporation any discount, rebate, commission or refund for the purpose of securing this advertisement for publication in the said newspaper. PUBLISHED ON: 06/12 i AD SPACE: 328.000 INCH FILED ON: 06/12/98 j /1Signature of Affiant Sworn to and Subscribed before me this day of G sw 19 t fo Personally known by me ! 1/.felit,f 6 .a172)6'1- rj '':a'•. Judith A.Flanigan MY COMMISSION F CC5C8787 EXPIRES February 19,2000 n;. BONDED TNNu'Inv FAIN INSURANCE IN; `l` i. 1 I Page 64 of 358 0119 MISCELLANEOUS 0119 MISCELLANEOUS r NOTICE NOTICE i.! STATE OF FLORIDA DEPARTMENT OF ENVIRONMENTAL PROTECTION NOTICE OF INTENT TO ISSUE I PERMIT AND A VARIANCE The Department of Environmental Protection in- Because the administrative hearing process is de- ends to issue a taint coastal permit (File No. signed to formulate agency action,the filing of a pet!. 0128463-0014C)to Collier County - Pelican Bay Serv- tion means that the Department's final action may be ices Division,c/o Ted Brown w/Akerman,Senterfitt,& different from the position taken by it in this notice. .Edison, P.A. 255 Orange Avenue, Orlando, Florida Persons whose substantial interests will be affected by I32801,to restore approximately 568 acres of mangrove any such final decision of the Department on the appli- estuarine ecosystem known as the Clam Bay Natural cation have the right to petition to become a.party to Resource Protection Area by enhancing the hydrology the proceeding, in accordance with the requirement of the system by dredging approximately 22,000 cubic set forth above. yards of sediments constricting the pass and interior Any person may elect to pursue mediation by waterbodies conducting periodic maintenance dredg- reaching mediation agreement with all parties to the I in g,placing the the quality material on the beaches proceeding (which include the applicant, the Depart- adiacent to Clam Pass,disposing the fine material on ment,and any person who has filed a timely and suffi- the uplands, replacing the three existing culverts on dent petition for o hearing) and by showing how the Seagate Drive with new,one-way flow to the north cut- substantial interests of each mediating party are af- I veils,removing nuisance exotic vegetation,and(mpie- fected by the Department's action or proposed action. i menting studies and programs to identify and reduce The agreement must be filed in (received by)the Of- t the amount of stormwater dischrage into the Natural lice of Geneeral Counsel of the Department at 3900 Resource Protection area. Commonwealth Boulevard, Mail Station 35 Tailahas- The Department also intends to issue a variance see Florida 32399.3000, by the same deadline as set (VE-11-726)from Rule 62-4.244(5),Florida Administra- forth above for the filing of a petition. five Code (F.A.C.), which requires a dredge and fill The agreement to mediate must Include the fo1- ' mixing zone to be no greater than 150 meters. The lowing: variance would allow an extension of the mixing zone (a) The name, address, and telephone numbers of th up to a total length of 1000 meters from the discharge any persons who may attend the mediation; pipe parallel with the shoreline and no further than 61 (b) The name, address and telephone number of i meters (200 feet)offshore to avoid significant natural the mediator selected by the parties,or a provision resources(live hardbottorn communities). for selecting a mediator within a specified time; The protect is located to the Clam Bay Natural Re- (c)The agreed allocation of the costs and fees as- source Protection Area and surrounding developments- sociated with the mediation; in Collier County,Sections 4,5,8,9,32,&33 of Town- (d) The agreement of the parties on the confiden- t ship 49 South, Range 25 East, Class II waters, not ap- flality of discussions and documents introduced 'i proved for shellfish harvesting.. - . during mediation; Ld A persons whose substantial interests are affected (c) The date,time and place of the first mediation by the Department's permitting decision may petition session or a deadline for holding the first session,if for an administrative hearing In accordance with sec- no mediator has yet been chosen; it 'tions 120.569 and 120.57 of the Florida Statutes.The pe- (f) The name of each party's representative who titian must contain the information set forth below and shall have authority to settle or recommend settle- must be filed(received)In the Office of General Coun- ment- set of the Department at 3900 Commonwealth Boule- (g) Either an explanation of how the substantial in- yard Mall Station 35,Tallahassee Florida 32399-3000. terest of each mediating party will be affectbed by LPetitions filed by the permit applicant or any of the_ the action or proposed action addressed in this no- parties listed below must be filed wihln 21 days of re-.. tice of a statement clearly identifying the petition ceipt of this notice.Petitions filed by any other person for hearing that each party has already flied, and must be-filed within 21 days of publication of the public incorporating It by reference;and notice or within 21 days of receipt of This notice which- (h)The signatures of all parties or their authorized ever occurs first.A petition must mail a copy of pe- representatives. Ltitian to the licant at the address Indicated above,at As provided in section 120.573 of the Florida Statutes , the fling of filing.The failure.of any person to file a pe- the timely agreement of all parties to mediate will toll tition(or a request for mediation as discussed below) the time limitation Imposed by sections 120.569 and within'the-appropriate time period shall donsttute a 120.57 for requesting and holding an administrative waiver of that person's right to request an odministra• hearing Unless otherwise agreed by the parties the 1 tive determination(hearing)?under sections:120.569 and mediation must be concluded within sixty days of the 120.57 of the Florida Statutes, or to intervene-1e this exclusion of the agreement.if mediation results in set- proceeding and participate as a party to it Any-subse- tlement of the administrative dispute,the Department quest intervention will be only at the discretion of the must enter a final order Incorporating the agreement . presiding officer upon the filing of a motion in commppll- of the parties.Persons whose substantial Interests will once with Rule 28-5.207 of the Florida Administrative be affected by such a modified final decision of the De- { Code. partment have a right to petition for a hearing only in _. A petition must contain the following information:.. accordance with the requirements for such petitions (a)The name, address, and telephone number of set forth above,and must therefore file their petitions each petitioner,the applicant's name and address, within twenty-one days of receipt of this notice. If me- the Department Permit File Number,and the cover: diation terminates without settlement of the dispute ty in which the protect Is proposed; the Department shall notify all parties in writing that i (b) A statement of how and when each petitioner the administrative hearing process under sections I` received notice of the.Department's action or pro- 120.569 and 120.57 remain available for disposition of posed action; • the dispute, and the notice will specify the deadlines l c A statement of how each petitioner's substantial that then will apply for challenging the avenvy action I , interests are affected by the Department's action and electing remedies undertthosetwo statutes. i I or proposed action- - The application is available for public inspection (d) A statement of the material facts disputed by, during normal business hours, 8:00 a.m. to 5:00 p.m., petitioner,if any; Monday through Friday, except legal holidays at the (e) A statement of the facts'which petttloner corr. Department of Environmental Protection, 5050 West tends warrant reversal or modification-at the Dad- Tennessee Street, Building B, Tallahassee, Florida (partment's action ordposed action; 32304.9201. �� the petitioner �n ends require reversal or modM- June 12 No.1225198 cation of the Department's action or proposed ac- tion;and O A statement of the relief sought by petitioner, sfttina precisely the action petitioner wants the De- partment to take with respect to the action or pro- posed action addressed in this notice. Page 65 of 358 Page 66 of 358 DEPARTMENT OF THE ARMY PERMIT Permittee: Collier County, Pelican Bay Services Division 801 Laurel Oak Drive, Suite 605 Naples, FL 34108 • Permit No. 199602789 (IP-CC) Issuing Office: U.S. Army Engineer District, Jacksonville NOTE: The term "you" and its derivatives, as used in this permit, means the Permittee or any future transferee. The term "this office" refers to the appropriate district or division office of the Corps of Engineers having jurisdiction over the permitted activity or the appropriate official of that office acting under the authority of the commanding officer. You are authorized to perform work in accordance with the terms and conditions specified below. Project Description: To perform activities in association with and as specified by the Clam Bay Restoration and Management Plan (CBRMP) , which is attached to, and made a part of, this permit as Attachment "A". Except as modified herein by either the General Conditions or the Special Conditions, the Permittee is authorized to implement the CBRMP as set forth therein. Specifically, the Permittee is authorized to proceed with the following works : (1) Replacement of Seagate Drive Culverts (pages 44 through 49 of the CBRMP) . (2) Clam Pass main channel dredging for Cuts 1, 2, 3, and 4 (pages 49 through 65 of the CBRMP) . (3) Excavation and maintenance of Interior Tidal Creeks (pages 65 through 71 of the CBRMP) . Page 67 of 358 • PERMIT NUMBER: 199602789 (IP-CC) PERMITTEE: Collier County, Pelican Bay Services Division PAGE 2 The above referenced works are to be completed as specified within the CBRMP and as shown and described on attached plans numbered 199602789 (IP-CC) in 38 sheets, dated April 1, 1998, which are attached to, and made a part of, this permit as Attachment "B". Project Location: The project is located within Clam Bay and the Gulf of Mexico, Sections 4, 5, 8, 9, 32, 33, Township 49 South, Range 25 East, Collier County, Florida. Permit Conditions: General Conditions: 1 . The time limit for completing the work authorized ends on JULr-7 11g . If you find that you need more time to complete the authorized activity, submit your request for a time extension to this office for consideration at least one month before the above date is reached. 2 . You must maintain the activity authorized by this permit in good condition and in conformance with the terms and conditions of this permit . You are not relieved of this requirement if you abandon the permitted activity, although you may make a good faith transfer to a third party in compliance with General Condition 4 below. Should you wish to cease to maintain the authorized activity or should you desire to abandon it without a good faith transfer, you must obtain a modification of this permit from this office, which may require restoration of the area. 3 . If you discover any previously unknown historic or archeological remains while accomplishing the activity authorized by this permit, you must immediately notify this office of what you have found. We will initiate the Federal and state coordination required to determine if the remains warrant a recovery effort or if the site is eligible for listing in the National Register of Historic Places . 4 . If you sell the property associated with this permit, you must obtain the signature and mailing address of the new owner in the space provided and forward a copy of the permit to this office to validate the transfer of this authorization. Page 68 of 358 • • PERMIT NUMBER: 199602789 (IP-CC) PERMITTEE: Collier County, Pelican Bay Services Division PAGE 3 5. If a conditioned water quality certification has been issued for your project, you must comply with the conditions specified in the certification as special conditions to this permit. For your convenience, a copy of the certification is attached to, and made a part of, this permit as Attachment "C". • 6. You must allow representatives from this office to inspect the authorized activity at any time deemed necessary to ensure that it is being or has been accomplished in accordance with the terms and conditions of your permit. Special Conditions: (1) The Permittee agrees to submit semi-annual reports (these and all other reports shall be submitted to U.S. Army Corps of Engineers, Regulatory Division, Enforcement Branch, P.O. Box 4970, Jacksonville, Florida 32232-0019 and shall reference the permit application number) commencing six months after permit issuance indicating the status of the project and shall include the following information: a. Date permitted activity was begun; if work has not begun on-site, please so indicate. b. Brief description and extent of work (site preparation, monitoring, created wetlands) completed since the previous report or since permit was issued. Indicate on copies of the permit drawings those areas where work has been completed. c. Brief description and extent of work anticipated in the next six months. Indicate on copies of the permit drawings those areas where it is anticipated that work shall be done. (2) The Permittee agrees to comply with the components and timeframes as specified within the Clam Bay Restoration Management Plan (CBRMP) , which is attached to this permit as Attachment "A". (3) The Permittee agrees that all studies and reports conducted as a part of the Stormwater/Freshwater Management component of the CBRMP will be coordinated with and approved by the Corps . Following this study period, the Permittee shall analyze the data gathered, formulate recommendations based upon the data, and to Page 69 of 358 PERMIT NUMBER: 199602789 (IP-CC) PERMITTEE: Collier County, Pelican Bay Services Division PAGE 4 the extent suggested by the data, design a plan or plans to reduce fresh water discharges into the Clam Bay ecosystem from the developed uplands. Furthermore, approval by the Corps of the study plans, final reports, and implementation is a requirement of this permit . Information contained in the study plans should include studies goals and objectives by which to achieve those goals . The Permittee agrees that if Corps determines that augmentation of the studies objectives are necessary to obtain the study' s goals then appropriate changes will be made to the details of the studies. (4) The Permittee agrees to submit to the Corps detailed drafts of the study plans indicated on sheet 11 of 35 of the CBRMP for review within 120 days from the date of the permit . The Permittee agrees that further augmentation of Study No . 1 (Stormwater Detention Volume & Water Budget Analysis) may be necessary pending review by the Corps . (5) The Permittee agrees that implementation of the studies will commence within 180 days from the date of this permit and preliminary data compiled within three (3) years from the date of this permit. The Permittee will provide a draft report of the studies to the Corps for review and approval within 30 days of the completion of the studies . (6) To the extent suggested by the data, the Permittee agrees to develop a plan to reduce upland water discharges into the system. This plan or plans are referred to as "Upland Water Discharge Reduction Plans" (UWDRP) and must be submitted for approval by the DEP and the Corps within 120 days following completion of the studies . (7) Once the UWDRP is approved by the DEP and the Corps, the Permittee shall implement the UWDRP in accordance with its terms, but in no event later than five (5) years following permit issuance unless a modification to that time frame is agreed to by the Corps . (8) The Permittee agrees to submit the monitoring report for UWDRP and any noted modifications or corrective actions needed as required by the UWDRP and/or the Corps . Furthermore, the Permittee agrees that all activities described here and in Section 4 .5. 4 of the CBRMP will be completed within ten (10) years from the date of this permit. Page 70 of 358 • PERMIT NUMBER: 199602789 (IP-CC) PERMITTEE : Collier County, Pelican Bay Services Division PAGE 5 (9) The Permittee agrees to provide compensatory mitigation for the 0.31 acre of proposed seagrass impact if re-establishment of those seagrasses lost as a result of the CBRMP implementation has not occurred in five years from the date of the permit. This mitigation will be accessed and in accordance with the Habitat Equivalency Analysis as proposed by the National Oceanic and Atmospheric Administration Damage Assessment and Restoration Program (HEA.doc Nov95) . (10) The Permittee agrees to the following conditions for any works associated with renourishment of the beach area: a. All works will occur outside of the sea turtle nesting season. b. The standard manatee construction conditions shall be included in any contract issued for the work. These conditions are attached to, and made a part of, this permit as Attachment "D". c. All beach impact areas will be tilled to a depth of 36 inches after the placement of spoil material. d. Native vegetation will not be disturbed by the placement of fill . Further Information: 1 . Congressional Authorities: You have been authorized to undertake the activity described above pursuant to: (X) Section 10 of the Rivers and Harbors Act of 1899 (33 U.S .C. 403) . (X) Section 404 of the Clean Water Act (33 U.S .C. 1344) . ( ) Section 103 of the Marine Protection, Research and Sanctuaries Act of 1972 (33 U.S.C. 1413) . 2 . Limits of this authorization. a. This permit does not obviate the need to obtain other Federal, state, or local authorizations required by law. Page 71 of 358 PERMIT NUMBER: 199602789 (IP-CC) PERMITTEE: Collier County, Pelican Bay Services Division PAGE 6 b. This permit does not grant any property rights or exclusive privileges. c. This permit does not authorize any injury to the property or rights of others. d. This permit does not authorize interference with any existing or proposed Federal projects . 3 . Limits of Federal Liability. In issuing this permit, the Federal Government does not assume any liability for the following: a. Damages to the permitted project or uses thereof as a result of other permitted or unpermitted activities or from natural causes . b. Damages to the permitted project or uses thereof as a result of current or future activities undertaken by or on behalf of the United States in the public interest. c. Damages to persons, property, or to other permitted or unpermitted activities or structures caused by the activity authorized by this permit . d. Design or construction deficiencies associated with the permitted work. • e. Damage claims associated with any future modification, suspension, or revocation of this permit . 4 . Reliance on Applicant' s Data: The determination of this office that issuance of this permit is not contrary to the public interest was made in reliance on the information you provided. Page 72 of 358 • PERMIT NUMBER: 199602789 (IP-CC) PERMITTEE: Collier County, Pelican Bay Services Division PAGE 7 5. Reevaluation of Permit Decision. This office may reevaluate its decision on this permit at any time the circumstances warrant . Circumstances that could require a reevaluation include, but are not limited to, the following: a. You fail to comply with the terms and conditions of this permit. b. The information provided by you in support of your permit application proves to have been false, incomplete, or inaccurate (see 4 above) . c. Significant new information surfaces which this office did not consider in reaching the original public interest decision. Such a reevaluation may result in a determination that it is appropriate to use the suspension, modification, and revocation procedures contained in 33 CFR 325.7 or enforcement procedures such as those contained in 33 CFR 326.4 and 326.5. The referenced enforcement procedures provide for the issuance of an administrative order requiring you comply with the terms and conditions of your permit and for the initiation of legal action where appropriate. You will be required to pay for any corrective measures ordered by this office, and if you fail to comply with such directive, this office may in certain situations (such as those specified in 33 CFR 209. 170) accomplish the corrective measures by contract or otherwise and bill you for the cost . 6. Extensions . General condition 1 establishes a time limit for the completion of the activity authorized by this permit. Unless there are circumstances requiring either a prompt completion of the authorized activity or a reevaluation of the public interest decision, the Corps will normally give favorable consideration to a request for an extension of this time. limit. Page 73 of 358 PERMIT NUMBER: 199602789 (IP-CC) PERMITTEE: Collier County, Pelican Bay Services Division PAGE 8 Your signature below, as Permittee, indicates that you accept and agree to comply with the terms and conditions of this permit . i -7?,'/-K; `''/ . �/; C.1"! Attachments to Department of the Army Permit Number 199602789 ( IP-CC) A. CLAM BAY RESTORATION MANAGEMENT PLAN (CBRMP) : The CBRMP consist of 95 pages B. PERMIT DRAWINGS: 35 pages, dated April 6, 1998 C. WATER QUALITY CERTIFICATION: Florida Department of Environmental Protection Specific Conditions (DEP) in accordance with General Condition number 5 on page 3 of this DA permit. The DEP Specific conditions consist of 14 pages . D. Manatee Conditions: 2 pages Page 75 of 358 Page 76 of 358 • CLAM BAY RESTORATION AND MANAGEMENT PLAN ATTACHMENT "A" to U.S. Army Corps of Engineers Permit No. 199602789(IP-CC) and Florida Department of Environmental Protection Permit No. 0128463-001-JC (formerly 113049919) This Attachment"A" corresponds to and is the same as the Clam Bay Restoration and Management Plan dated December 11, 1997. 1 OR038780;1 1 Page 77 of 358 ,-- INDEX OF FIGURES SHEET FIGURE DESCRIPTION 1 1.1(a) Location Map 2 1.1(b) 1992 Mangrove Die-off Areas 3 1.1.(c) 1995 Mangrove Die-off Areas 4 1.1(d) 1996 Mangrove Die-off Areas 5 3.2.2.1(a) Map of Clam Bay 6 3.2.2.1(b) Map of Pelican Bay Stormwater Management (North) i 7 3.2.2.1(c) Map of Pelican Bay Stormwater Management (South) 8 3.2.3.1(a) Salinity and Tide Gage Field Stations 9 3.2.3.3(a) Water Quality Monitoring Stations 10 4.4(a) Restoration Implementation Schedule 11 4.4(b) Water Study Implementation Schedule 12 4.5.1(a) Location Map- Seagate Culverts 13 4.5.1(b) Existing Conditions - Seagate 14 4.5.1(c) Proposed Improvements - Seagate 15 4.5.1(d) Check Valve Detail 16 4.5.1(e1) Erosion/Turbidity Control 17 4.5.1(e2) Erosion/Turbidity Control 18 4.5.2(a) Plan View of Constrictions 19 4.5.2(b) Mean Tidal Cycle 4.5.2(c) Water Surface Cumulative Frequencies 20 4.5.2(d) Representative Water Depths 21 4.5.2(e) Model 1; Creeks and Bays 4.5.2(f) Model 2; Storage Areas 22a 4.5.2(g)(1) Alignment of 4A of the Channel 22b 4.5.2(g)(2) Sheets 1 and 2 showing Seagrass Disbursement 22c 4.5.2(g)(3) Sheets 3 and 4 showing Seagrass Disbursement 23 4.5.2(h)(k) Excavation/Disposal Plan -Cuts 1, 2, & 3 24 4.5.2(1) Excavation Plan; Cuts 3 and 4 -4D 25 4.5.2(i) Typical Cut Sections 26 4.5.2(m) Organisms Offshore From Clam Pass 27 4.5.2(n) Hardbottom Transect Locations 28 4.5.2(o) Spoil Discharge and Mixing Zone Locations 28(a) 4.5.2(p) Spoil Discharge; Plan View 29 4.5.3(a) Photographs of West Side of Upper Clam Bay 30 4.5.3(b) Phase One Sub Management Area 31 4.5.3(c) Phase Two Sub Management Area 32 4.5.3(d1) Phase Three Sub Management Area 33 4.5.3(d2) Phase Three Sub Management 34 4.5.3(e) Matrix of Channel Excavation Priorities OR025292,1 .I Page 78 of 358 35 4.5.3(f) Cross Sections of Main Channels 36 4.5.3(g) Lateral Channels and Swales 37 4.5.3(h) Methods of Spoil Disposal (1) 38 4.5.3(i) Methods of Spoil Disposal (2) 08025292;1 Page 79 of 358 Page 80 of 358 TABLE OF CONTENTS 1.0 INTRODUCTION 1.1 Background 1 1.2 Purpose 4 1.3 Goals 5 1.4 Approach 6 1.5 Management Plan Organization 7 2.0 ROLE OF PELICAN BAY SERVICES DISTRICT 2.1 Existing Regulatory Framework and Management Authority 9 2.2 Role of Manager 10 3.0 MANAGEMENT OPTIONS 3.1 Education and Public Awareness 13 3.2 Environmental Management 14 3.2.1 Characteristics of Clam Bay 14 3.2.1.1 Geography 14 (a) Mangrove Mortality 19 3.2.1.2. Hydrology 20 (a) Estuarine Component 21 (b) _ Freshwater Component 25 3.2.2 Proposed Characteristics of Clam Bay 28 3.2.2.1 Clam Pass 28 3.2.2.2 Interior Tidal Creeks 31 3.2.2.3 Vanderbilt Lagoon Reconnection 32 3.2.2.4 Seagate Culverts 33 3.2.2.5 Stormwater Management 34 - 3.2.2.6 Upland Irrigation Water Management 35 OR025293;1/FP1 j Page 81 of 358 3.3 Recreation 36 3.3.1 Current Recreational Component 36 3.3.2 Proposed Recreational Component 37 4.0 IMPLEMENTATION 4.1 Approach 40 4.2 Action Plan Development 40 4.3 Management Plan Evaluation, Planning and Funding 41 4.3.1 Evaluation and Review 41 4.4 Implementation Schedule 43 4.5 Management Components 43 4.5.1 Seagate Culverts 45 4.5.1.1 Existing Conditions 45 4.5.1.2 Proposed Conditions 46 4.5.1.3 Timing 47 4.5.1.4 Design 48 4.5.1.5 Construction 48 4.5.1.6 Post Construction Management 49 4.5.1.7 Pre Construction Monitoring 49 4.5.1.8 Post Construction Monitoring 50 4.5.2 Clam Pass 51 4.5.2.1 Existing Conditions 51 4.5.2.2 Remedial Alternatives . . 59 4.5.2.3 Design 61 4.5.2.4 Construction 65 4.5.2.5 Monitoring 66 4.5.3 Interior Tidal Creeks 68 4.5.3.1 Existing Conditions 68 4.5.3.2 Proposed Conditions 69 4.5.3.3 Timing 70 4.5.3.4 Design 72 - 4.5.3.5 Construction 72 4.5.3.6 Post Construction Management • 73 4.5.3.7 Post Construction Monitoring 73 OR026293;1/FP1 11 Page 82 of 358 4.5.4 Stormwater/Freshwater Management 74 4.5.4.1 Existing Conditions 74 4.5.4.2 Proposed Conditions 76 (a) Study Number 1. 78 (b) Study Number 2. 78 (c) Study Number 3. 81 (d) Study Number 4. 81 (e) Study Number 5. 82 (f) Study Number 6. 82 4.5.4.3 Conclusion 83 4.5.5 Ecosystem Enhancements 84 4.5.5.1 Integration and Modification of Exisiting Permits Monitoring Criteria 84 4.5.5.2 Withdrawal of Permit Application for Clam Bay Overflow Structure 87 4.5.5.3 Evolution of Clam Pass Tidal-Channel Network 87 4.5.5.4 Dead Mangrove Removal and Landscape Restoration 88 4.5.5.5 Cattails 90 4.5.6 Monitoring 91 4.5.6.1 Salinity Monitoring 91 4.5.6.2 Biological Monitoring 93 4.5.6.3 Sediment/Water Quality Monitoring 94 4.5.6.4 Hydrologic Monitoring 95 4.5.6.5 Seagate Culverts Flow Monitoring 95 4.5.7 Contingency Planning _ 96 4.5.7.1 Clam Pass/Main Channel 96 4.5.7.2 Interior Tidal Creeks 97 4.5.7.3 Seagate Culverts 98 5.0 FIGURES • 0R026293;1/FP1 1 1 1 Page 83 of 358 Page 84 of 358 INTRODUCTION 1.1 Background Clam Bay is located on the west coast of Florida in Collier County. (Figure 1.1(a)) Over the years it has remained relatively undisturbed but in recent years, partly as a result of urbanization of the region and land development and partly as a result of implementing water control practices on adjoining lands, modifications to Clam Bay and its associated ecosystem have been observed. These changes are noticeable in how they affect historic freshwater flow patterns as well as salinity and sedimentation regimes. Although changes occurred, Clam Bay continued to be a relatively pristine estuarine environment, and the natural qualities of the system have, in the main, been preserved. By limiting development in the uplands lying east of the estuary and designating the estuary itself as a county preservation area the prospects for its continued success would appear promising. Up until approximately 1992, Clam Bay was functioning • without noticeable threat to the viability of the mangroves and the interrelated ecosystem. However, in 1992 an area of dead black mangroves was discovered west of Upper Clam Bay. (See Figure 1.1(b)) Subsequent investigation of the mortality did not reveal the cause and red and white mangroves were seemingly unaffected by the die-off. First reports limited the geographic extent of the die-off to no more than 7 acres. In 1995 significantly larger areas of-mangroves were dying and as of April 1996 the acreage of dead mangroves within the Clam Bay system was approximately 50 acres. (Turrell, 1996; Collier County Report, 1996). More recent investigation suggests that the system has remained relatively stable, but still under considerable stress. Although there is some indication of regeneration in the areas of prior die off(Figure 1.1(c)) other areas exhibit signs of increasing stress. (See Figure 1.1(d)). In response to this die-off a number of interrelated initiatives were undertaken by both the public and private sectors in an attempt to: (1) determine the cause of the die-off onoaspinol and, (2) slow the die-off and initiate limited restoration. Those efforts all produced meaningful data that has and will contribute to the understanding of the system that we have today. As a result a variety of related permit applications were prepared by WCI Communities, L.P., The Pelican Bay Services Division and Collier County. The applications proposed to alter the operational characteristics of the Clam Bay system, primarily by altering the temporal extent and quantity of water within the Clam Bay system. First, Collier County processed a permit to dredge limited areas of Clam Pass to facilitate the movement of tidal water in and out of Clam Bay. The USACOE permit for this activity was issued on April 2, 1996 with the companion FDEP Permit being issued on March 28, 1996. The latter was modified April 10, 1996 with the authorized work being undertaken and completed on April 17, 1996. The practical effect of implementing this Permit was to reopen the Pass, but it now seems clear that without a more comprehensive strategy, this effort, standing alone, will not revitalize the Clam Bay ecosystem. Second, a permit to improve channel flow within defined areas of the Clam Bay system by a combination of blasting and hand excavation was issued on June 26, 1996. The work was undertaken and completed in two segments. The first channels were opened in August, 1996 and the second chanhels were opened in November, 1996. The results of these two initiatives are positive in that measurable improvements in tidal flow are discernible and with that has come improved conditions for natural revegetation. Third, a permit was issued on January 5, 1997 to construct a portable pump and pipe system as an interim measure to divert freshwater within the Clam Bay system to the Gulf while a more permanent solution contemplated by the construction of an outran structure was reviewed. This plan envisioned two pumps that would be operational when the water surface elevation within Clam Bay exceeded a specified threshold. The 86 of 358Pi 2 plan anticipated the direct discharge of excess water into the Gulf with the expectation that this system would augment the natural discharge through the tidal mechanism after severe storm events. Fourth, is an effort to provide a mechanism for discharging excess stormwater directly to the Gulf by construction of an overflow or outfall structure on a permanent basis. When complete, the system as proposed,'would allow water within the Clam Bay to be maintained at predictable levels and like the portable pump and pipe system described above, provide for additional discharge capacity. The disposition of this application is discussed in Section 4.5.5.2 below. Lastly, Collier County has authorized the pursuit of a ten year permit to allow the County, or its designee, to maintain Clam Pass in an open condition. The application, as filed, does not address any other issues affecting the operational characteristics of Clam Bay and essentially mirrors the Permit described in paragraph "First" above. It is anticipated that a modified version of the permit as applied for will have been issued and implemented prior to final agency review and approval of this Management Plan. The permit to be issued pursuant to the pending application is anticipated to be for a period of one year and to allow only modest excavation within a discreet area of Clam Pass. Various other initiatives have from time to time been proposed, reviewed, and discussed by groups and individuals, both public and private, in a continuing effort to manage and preserve the Clam Bay ecosystem. The land use patterns surrounding Clam Bay are primarily residential with complimentary retail, office and hotel development. The restrictions on development and use activities resulting from both the imposition of land use regulation and restrictions have helped preserve the conditions of Clam Bay, but the increased urbanization of portions of the drainage basin that drains into Clam Bay has contributed to physical, chemical, and biological changes to Clam Bay. tiPCbtf 3 1.2 Purpose The Pelican Bay Services Division (PBSD), both as a representative body for the resident base of Pelican Bay and as an operative division of Collier County government, considers Clam Bay an important natural resource, not only for the Pelican Bay community, but also for the State of Florida and Collier County. As a result the PBSD seeks to devise and implement a Management Plan for the whole of Clam Bay, including Clam Pass. The Management Plan is intended to assure control over public recreational uses, improve the ecological productivity of the bays, and preserve and enhance the natural resources and multiple, beneficial uses of Clam Bay. To do so the Management Plan addresses the Pelican Bay development and the Clam Bay ecosystem as an integrated whole; recognizing that both systems interact with and contribute to the other. The Management Plan for Clam Bay is contained in this document. The PBSD has developed this Management Plan with a goal of implementing a series of immediate or short term adjustments to the system as well as creating a guidance document for the long-term management of Clam Bay. It is recognized that as management protocols are implemented, monitoring conducted, and the demands on the natural ecosystem change, new challenges and opportunities will develop beyond those presented in this-plan. The PBSD is aware that changes will occur and has developed a Management Plan that is dynamic and can be modified through time while still meeting the PBSD's goals. The schedule discussed below provides for a yearly review of the management protocols, selecting management protocols for future implementation and modifying protocols to address changing needs. The management protocols to be implemented are based on a priority of importance resulting from a decision matrix generated by a review of the environmental history of Clam Bay as reflected in various data sets, reports, studies and interviews, the majority j g age 8 o�f�3 1 4 of which are summarized in a report dated September 19, 1996 entitled "Clam Bay Ecosystem Management: An Opportunity" (the "Report"). The Report has been used to select those management protocols that meet the goals established by the PBSD and related and interested stake holders. The long-term goal of the Management Plan is that it be used as a tool for evaluating new management options, as well as existing protocols as circumstances require. It should be used minimally, on an annual basis, for reviewing any new issues or options, as well as for evaluating existing operational protocols. These analysis will assist in the prioritization for implementation in the next ensuing year. As new management issues develop and others are resolved or implemented,the Management Plan can be updated to reflect the current and future needs of Clam Bay. This Management Plan has focused on a defined set of protocols and goals as described below. • 1.3 Goals The goals established by the PBSD for the Clam Bay Management Plan are: • restore the hydrology and efficient tidal flushing to Clam Pass and the interior tidal creeks; • restore the habitat values of the Clam Bay ecosystem and diversify the same; • satisfy the-stormwater-discharge, including irrigation and water quality requirements necessary for the continued development of Pelican Bay, exploring how those might be adjusted to accommodate the needs of the Clam Bay ecosystem; • consider the development and implementation of a best management practices program to assist in modulating irrigation requirements for the developed areas of Pelican Bay; • develop a contingency plan for the continued maintenance of Clam Pass and the interior tidal creeks; oRP50%%;010/1 5 • maintain the storm surge attenuation values of the mangrove forest; • continue limited human intrusion into mangrove forest and under controlled circumstances; • develop operational protocols that allow the permit holder the flexibility to respond to changing circumstances under defined parameters; and • accelerate the revegetation of the barren area by planting those species most appropriate to the specific site conditions. The balance of this report discusses the immediate needs of Clam Bay, the suggested maintenance and rehabilitation requirements of Clam Bay after initial retrofitting, and seeks to provide the guidance and protocols to accomplish the objectives of the plan. 1.4 Approach The approach used to develop the management plan utilized a multi disciplinary team. The PBSD selected the team approach because of the complexity of the Clam Bay system. For example, the presence of loggerhead sea turtles (Carett? carella), a threatened species, the concern for freshwater inputs, the maintenance of adequate tidal flushing, and recreational uses are but a few of the issues that make management of Clam Bay a dynamic issue. The multi disciplinary team was headed by Ted R. Brown and Hilburn Hillestad as project managers. The consultant team consisted of: • Steve Means and Dorothea Zysko of Wilson, Miller, Barton & Peek, Inc., environmental and civil engineers; • David Tackney of Tackney & Associates, Inc.,hydrological and coastal engineers; • Robin Lewis of Lewis Environmental Services, Inc., environmental consultant; • Sam Snedaker, Ph.D. of University of Miami, environmental consultant; and onge950, 358p1 6 • Mac Hatcher and Bill Lorenz of Collier County Department of Natural Resource Protection. • The approach used by the PBSD to develop the management plan included several supporting tasks. First, a technical assessment was conducted that included a bibliographic search of available information relating to Clam Bay. This included a review of environmental, engineering data and computer modeling of various operational characteristics of the Clam Bay ecosystem. This technical information was gathered to provide a better understanding of Clam Bay and the required up-to-date and relevant facts needed to develop a workable and successful management plan. This information was compiled to evaluate management options in relationship to their potential for meeting the goals of the Management Plan. A variety of management options were considered and not all are reviewed here. The management options were evaluated with one overriding objective in mind; restoring the ecological productivity of Clam Bay and in particular, the productivity of the mangroves within the Clam Bay ecosystem. Based on local public input, directives from Federal, State and local government, technical studies and fiscal considerations a total of five (5) management protocols were selected for implementation. They are set forth in Section 4.0 of this Management Plan. 1.5 Management Plan Organization The Management Plan is organized and discussed under the following major topics: • Role of the PBSD; • Education and Public Awareness; • Environmental Management; and • Management Plan Implementation. O1042680;1/FP1 7 Page 91 of 358 In the section entitled the Role of the PBSD, the report discusses a framework for the PBSD to become not only a clearinghouse and coordinator for activities relating to the Clam Bay, but also the primary manager of the implementation protocols. The Education and Public Awareness section discusses the management options for enlisting public support and educating the public relative to the importance of Clam Bay as an ecological resource. The Environmental section discusses associated and selected environmental attributes of .Clam Bay and how they point to various management options leading to implementation. The Management Plan Implementation section discusses guidelines for implementing the Management Plan, a proposed schedule for implementing the Management Plan and potential funding sources for the implementation of the Management Plan. • Tat2e680;1/FPl 8 Page 92 of 358 Page 93 of 358 Page 94 of 358 2.0 ROLE OF PELICAN BAY SERVICES DISTRICT 2.1 Existing Regulatory Framework and Management Authority Numerous federal, state, county, local government agencies and concerned citizens are involved in some aspect of management, regulatory control or other activities relating to Clam Bay. For the long-term management of Clam Bay to be successful, coordination among these disparate groups and agencies is critical. The PBSD's position as a unifying force and manager is a logical outgrowth of its initiation of this process. The PBSD is a dependent special district known as the Pelican Pay Municipal Services Taxing and Benefit Unit. As such, it was formed pursuant to Chapter 125, Florida Statutes, and was activated under enabling legislation passed by the Collier County Commission in Ordinance No. 90-111 and 91-22. It was created to, among other things, provide for the "maintenance. of conservation or preserve areas"within Pelican Bay. This charge is consistent with the proposed management prerogatives contemplated under this Management Plan. As a dependent special district, the PBSD is an arm of local county government and as such does not enjoy the unfettered right to make decisions concerning the implementation mne County Commissionof .the The Manage district's ent budgetPlan, and indepe therefore dent its of capacity the wishes to control of th its work Collier and project undertakings, is controlled by the Collier County Commission. In practical application, this has not proved problematic, as the Commission has routinely approved the suggested undertakings of the PBSD and the Commission has authorized this application and the Management Plan. The PBSD implements County policy within the confined geography of the Pelican Bay community and the defined responsibilities of the PBSD. The PBSD sets its own agenda and routinely submits the same to the County Commission for approval. The actual workings of the relationship suggest therefore, omitAexpoalitFi 9 that the PBSD has experienced a significant degree of practical autonomy and that is expected to continue here. The result is that the PBSD will be the official manager of the Management Plan with delegated management prerogatives to be implemented consistent with Ordinance No. 90-111 and 91-22 of Collier County. 2.2 Role of the Manager As the official manager of the Management Plan, the PBSD will direct and have responsibility for its implementation and operation over time. As such, the PBSD will plan and implement identified management protocols. The objectives of these management protocols will be to protect, enhance, and maintain the natural resources and the ecological value of Clam Bay. • The PBSD has several attributes which already make it a unifying and guiding force in the management of Clam Bay. These attributes include: • • Located within the Clam Bay drainage basin; • Advisory board appointed by the County Commission from residential, business and landowner communities within Pelican Bay; • Fiscal support from local benefit assessments; • Accessible by the public - local governing board - monthly public meetings; and • a demonstrated commitment to the resource and its preservation and enhancement. These attributes give PBSD the knowledge and expertise in matters of local concern and, in particular, being made aware of problems, opportunities and interests of local residents, particularly as they relate to the Clam Bay ecosystem. Its relationship by operation of law to the County Commission give it an additional level of access to oRmgEgy 10 expertise and oversight, necessary to assure that the Management Plan, as contemplated here, is fully implemented in the field. As part of its responsibilities, the PBSD will assemble and dispense various technical reports and assessments as required under the Plan, as well as, provide for coordination among various public and private groups interested in Clam Bay. There are a variety of permits required by a various natural resource and environmental regulatory agencies in the ongoing administration of Clam Bay. For the PBSD to have meaningful impact on the management of Clam Bay, it must have full knowledge of all regulated activities and the agencies which administer them. This, together with knowledge and information about activities that may result in potential negative environmental consequences and the probable reaction of the various regulatory agencies having jurisdiction over the resource, is invaluable to the ongoing administration of the Management Plan. The PBSD is organized for and designed to maintain both its knowledge of the Clam Bay resource and to generate enhanced public support for the same. The PBSD has identified and recognizes the following needs: • the need for broadening the base of public support and involvement; • the need to develop focused scientific and political expertise; • the need to develop accountability, both short term and long term; • the need to insure preservation and enhancement of the data base; • the need to develop enhanced citizen participation; • the need to have a structure around which government agencies can interface with the plan managers and vice versa • the need to minimize, and eliminate, duplication of effort. The PBSD will insure that the general public resident in Pelican Bay, PBSD consultants when appropriate, and representatives from government agencies with jurisdiction over O O vi WO 2. 11 Clam Bay each have ongoing involvement in the administration of the Plan as appropriate. To that end, the PBSD will design a mechanism for bringing the selected agencies • together to review and discuss their respective positions with the PBSD. These discussions will focus on both the ongoing implementation of the Management Plan and concerns for future modifications to the same. Additionally, the PBSD will allow input from consultants and the resident base, as well as, the general public. The mechanics for incorporating these protocols into the operational characteristics of the PBSD will be developed following approval of the Management Plan. mow%;(gf/ i 12 Page 99 of 358 3.0 MANAGEMENT OPTIONS 3.1 Education and Public Awareness One of the most important management protocols is to increase education and public awareness of the issues affecting Clam Bay. For the Clam Bay Management Plan to be successful, and the PBSD to fulfill its role as a coordinator and manager, public involvement will be a necessity. The PBSD already has several ongoing projects that encourage public involvement. Primary among these is their monthly meeting. The PBSD needs to educate the public and enlist their support for the Management Plan to be a success. An important aspect of enlisting public support is to inform and educate them to what the PBSD has done in regards to furthering the understanding of the Clam Bay and the PBSD's goals and objectives for managing and preserving Clam Bay. The PBSD will develop an enhanced "Constituent Relations Program" for information dissemination. This program will be managed by PBSD staff and focus on presentations for group meetings both inside and outside the Pelican Bay community. The program could also-be used as-a tool to raise donations and to find and educate potential funding agencies. It will be updated as needed to reflect the accomplishments of the PBSD, the Management Plan and future objectives. Because the implementation of this option is beyond the present manpower capabilities of the PBSD staff, it will of necessity, require substantial assistance from the resident base, civic groups and city, county and state governments. 99g6 13 The goal is to make sure at the beginning of the implementation of the Management Plan, that expectations are managed and that as implementation proceeds, the accomplishments of the Management Plan can be recorded and disseminated to ensure that first;the constituency served by the Management Plan is fully informed; second,the government is abreast of all development affecting the resource and the Management Plans impact upon it and third, an ever larger base of informed citizens is able to make rational decisions for future adjustments to the Management Plan. 3.2 Environmental Management One of several reasons for promoting a Management Plan for Clam Bay was to identify enhancement, restoration, habitat protection and monitoring requirements for the Clam Bay. The elaboration of these requirements is important to the Management Plan for a variety of reasons. First, the enhancement of existing habitat and the restoration of damaged or lost habitats will necessarily improve the productivity and environmental quality of Clam Bay. This directly addresses one of the management goals, to enhance the productivity of the marine estuary. Second, monitoring of the identified important parameters will provide the information needed to determine the effectiveness of the implemented management protocols, identify long-term changes, and identify future management needs. 3.2.1 Characteristics of Clam Bay 3.2.1.1 Geography Typically, wherever coastlines are protected from the direct action of waves, the area between tides (intertidal zone) supports salt tolerant wetland vegetation. At Clam Bay the intertidal community is the mangrove forest. The mangrove forest at Clam Bay is structured and behaves as expected for a normal mangrove forests of the type found in the coastal regions of South Florida. (Lugo 1976). °Page61 ;(AP' 14 Clam Pass is part of the Clam Bay system which consists of three primary bays; Outer Clam Bay, Inner Clam Bay and Upper Clam Bay. (See Figure No. 3.2.2.1(a)). The three bays are connected by a series of tidal creeks and all receive runoff from adjacent upland and wetland areas. (Turrell 1995; Tackney 1996). Outer Clam Bay, the largest of the three bays, connects to an interior channel that connects to the Gulf of Mexico by way of Clam Pass. Tidal range is restricted throughout the Clam Bay system. (Turrell 1995; Collier County Report 1996; Tackney 1996). Clam Pass is a small, marginally stable inlet that has migrated north and south along the shore over the years. The Pass remains the primary source of tidal exchange for the Clam Bay system, but it is restricted by sediment deposits just inside the pass and in the long meandering tidal creeks surrounded by mangrove forests. The smaller embayments located primarily to the north of the pass are not subject to normal tidal exchange except during exceptionally high tides. (Tackney 1996; Turrell 1995). The system is bounded on the north by Vanderbilt Beach Road, to the south by Seagate Drive, to the east by the Pelican Bay Development and to the west by the Gulf of Mexico. The development of Pelican Bay had a limited impact on the wetlands themselves (approximately 78 acres located in the northwestern corner of the property) leaving the mangrove forest intact and preserved around the bay. (Tackney 1996; Wilson, Miller et.al. 1996). The development landward of the mangroves required a stormwater management system which was designed to and does spread runoff along the eastern edge of the Clam Bay estuary. (Collier County Report 1996). At the extreme northwest end of the system and continuously along the eastern edge of Clam Bay, runoff into the bay occurs. (See Figures No. 3.2.2.1(b) and (c)) (Collier County Report 1996; Wilson Miller et.al. 1996). A berm separates the developed portion of Pelican Bay from the estuary lying to the west of the development, but numerous culverts through the berm discharge water to a Swale system along the eastern perimeter of Clam Bay. (Wilson, Miller et.al. 1996). oi$is ; 15 Clam Bay, now designated a Natural Resource Protection Area by the Board of County Commissioners of Collier county, consists of approximately 540 acres of mangroves and some 30 acres of open water bays. Lodge (1994) in "The Everglades Handbook" discusses the ecological requirements, characteristics, and the contribution of mangroves to coastal ecosystems. He observes that mangroves are tropical trees, adapted to salt water and the rigors of living in areas of persistent tidal exchange. Three species of mangroves are found in Clam Bay: the red mangrove (Rhizophora Mangle), the white mangrove (Laguncularia racemosa) and the black mangrove (Avicenna germinans). The red mangrove is adapted to its intertidal habitat by its aerial or"prop" roots. These roots form the support for the tree, reaching out in all directions from the trunk. Red mangroves normally occupy the channel edges and outer locations of mangrove swamps where the tidal influence is most pronounced. The white mangrove typically occurs at higher elevations within Clam Bay ecosystem adjacent to the edges of the black mangrove wetland, and adjacent to the uplands when these area are fairly well drained. The species may occur sporadically elsewhere especially near the fringes of the small intertidal drainage systems. The black mangrove has adapted to life on saline, hydric anaerobic soils. A characteristic that distinguishes the black mangrove species is that it has a distinct horizontal root system consisting of long cable roots with small extensions called pneumatophores rising above the sediment and anchoring roots extending deep into the sediment. Pneumatophores function to allow the tree to exchange gases and by doing so allow the tree to survive in the interreaches of the intertidal zone where the tidal action is very sluggish and where shallow flooding may be prolonged. This root characteristic also makes the black mangrove susceptible to stress when the mean water table elevation rises above the horizontally-flattened base of the tree trunk and 0%1011193 WE6 16 the cable roots. Those species with a vertical root architecture, like the red and white mangrove, are not similarly affected. (Snedaker pers. comm. 1996). In general, mangroves maintain a high portion of their total living biomass below ground. • Whereas, the root system in most other trees represents 20-30 percent of the living biomass, in mangroves it is between 40-60 percent. This suggests that any stress on the root system of mangroves has a significant effect on the health of the trees. (Snedaker pers. comm. 1996). There are three processes of the black mangrove forest which are applicable to the Clam Bay ecosystem. These three processes are briefly reviewed here. Salt balance: Salt is available to the black mangrove forest from a variety of sources, but the normal tidal exchange is the most important. Black mangrove can tolerate a marginally higher sediment salinity than the other mangrove species but can be affected adversely by an excess accumulation of salt. In a natural setting, a potentially toxic accumulation of salt is prevented by dilution and leaching by rainfall and washout on outgoing tides. Accordingly, the transport of dissolved and diluted salt back to the Gulf is critical to the health of the black mangrove. Organic matter budget: Like the salt balance, the organic matter budget is intimately related to the flushing component of the tidal cycle. It is generally recognized that even in the best of circumstances only 60-86% of the decomposing matter generated by the black mangrove forest is consumed on site. Accordingly, the balance is exported. This export is in the form of highly fragmented or dissolved organic matter fractions and as such is dependent upon tidal flushing. Water budget: Water enters the Clam Bay system through rainfall, freshwater run-off and through the influx of seawater. It leaves via evaporation from water surfaces, transpiration from leaves and run-off to the Gulf. Since evapotranspiration rates within °Rage ISA of 358 17 the black mangrove forests are relatively low it follows that the black mangrove forest must freely drain or else water logging occurs that quickly leads to stress and mortality. Rainfall in South Florida contributes about 53 plus inches of water per year and most of that occurs in the wet season. Additional freshwater inputs to this system occur from groundwater flow and from irrigation in the developed portions of Pelican Bay. The latter amounts to about 26 to 28 inches of rainfall equivalent every year. When this amount is added to normal rainfall, the export capacity of the system to the Gulf becomes critical, especially when considered in the context of the need to transport the organic matter and salt described above. The combination of these mangrove species and other intertidal vegetation makes mangrove forests extremely productive natural resources, but their productivity depends on the right combination of tidal "flushing" (movement of water and suspended material in and out of the estuarine wetland) and freshwater run-off to maintain their ability to function. The freshwater input dilutes the high salinity of marine waters, thereby reducing the effort needed by the mangrove to exclude or excrete salt. This allows more of the trees' energy to be directed to normal growth and maintenance. Tidal flushing also allows nutrients to be distributed within the forest and provides for the transportation of dead leaves, twigs, etc. As these materials decay, they become food for marine life. It is this mangrove deiritus which is consumed by the many organisms at the base of the food chain and which in turn create the next level of the food chain necessary to support the fish populations that characterize the mangrove community. It is the combined interaction of fresh and salt water through tidal flushing that is critical to the ability of the mangrove forest to sustain itself. It follows therefore, that anything that materially disrupts the maintenance of the flushing component threatens the long term viability of the mangrove forest itself. Wa2, af! 18 (a) Mangrove Mortality The death of mangroves within Clam Bay was seemingly confined to black mangroves, or in areas categorized as basin forests. The death of trees occurred around hyper saline ponds and is consistent with conditions caused by periods of excessive inundation of freshwater followed by periods of continuous dry down, particularly where the mechanism for flushing is impaired. (Lugo 1976). During the period immediately preceding the observed die off, and during the period following, Clam Bay received record amounts of rainfall. This rainfall, when coupled with an admittedly impaired circulation system and intermittent pass closure, resulted in water levels that "were high enough for a long enough period of time to suffocate the root systems of black mangroves..." (Hatcher 1995). It should be noted, however, that the death of trees around hyper saline ponds is a process that is now occurring for a variety of reasons elsewhere in Florida and the Caribbean and is not necessarily evidence that the forest is in a state of irretrievable decline. The presence of new seedlings confirms that these conditions may well be able to return. (Lugo 1976; Snedaker pers. comm. 1996). Presently the black mangrove die- off area or dead zone appears to be transitioning into a highmarsh community consisting of saltwort(Batis maritime) and glasswort(Salicomia virginica)(Johnson 1996). Further, there is abundant evidence of the re-emergence of mangroves as well. The die-off area is contributing to a diversification of habitats within the Clam Bay area giving rise to significantly increased use of portions of the site by foraging wading birds. (Johnson 1996). The interim remedial efforts described earlier and in particular the dredging of Clam . Pass and the opening of several of the impacted tidal creeks by blasting and hand excavation have had the desired effect of improving the circulation of tidal waters within the system. (See Sections 4.5.2 and 4.5.3 below). (Lewis pers. comm. 1996; Means °PRO t8e 19 pers. comm. 1996). Rainfall for 1996 has returned to a more normal pattern, although somewhat drier, but Clam Pass itself continues to accumulate sand and suggests that future excavation will be required to maintain the pass in an open and fully functioning condition. 3.2.1.2 Hydrology The hydrological regime, sometimes referred to as the surface water or surficial hydrology, is the most critical factor for mangrove maintenance. This is because the surficial hydrology has horizontal and vertical components which serve two key ecological functions although on differing spatial scales. With respect to the horizontal component, incoming water into a mangrove wetland brings with it nutrients, dissolved oxygen, and marginally lower salt concentrations. Conversely, the outgoing water leaving a mangrove wetland removes metabolic waste products (e.g., carbon dioxide, toxic sulfides) and excess salt. The vertical component refers to incoming oxygenated nutrient-enriched water that percolates down into the sediment and root zone, and the sediment drainage, on falling tide, the removal of metabolic wastes and excess salt. (Snedaker pers. comm. 1997) It is the inflow and outflow of sea water that is critical to the ability of the mangrove forest to manage these'two ecological functions and as such dissipate salts, organic matter and freshwater. It follows that anything that affects the system and alters the ability of the system to perform these functions, will, in most instances, cause stress to the system and, at some point in time, result in the death of the system, or portions of it. Tolerances are wide and stress is to components of the system and while death is rare, recovery is slow. °Pa4k 7;Yfiti 20 (a) Estuarine Component The Clam Bay system was originally part of a larger tidal system connected to the Gulf of Mexico by three tidal inlets; Wiggins Pass, Clam Pass and Doctors Pass. (Turret! 1996). During the early 1950's this system was isolated from adjacent bays by the construction of Seagate Drive to the south and the construction of Vanderbilt Beach Road to the north. The practical effect was to leave Clam Pass as Clam Bay's only connection to the Gulf. In 1976 culverts were placed under Seagate Drive to provide some exchange from Venetian Bay (a residential sea wall bay system) and improve water quality in the Doctors Pass area. The USEPA in 1975 suggested that the culverts be constructed to only allow flow to the north and to set inverts of the pipes of 1.0 ft. msl to protect the sea grass meadows in Outer Clam Bay. The invert elevation was achieved but water was allowed to flow both ways through the culverts and this two way flow persist today. (Tackney 1996; Collier County Report 1996; Wilson, Miller et.al. 1996). Hydrologic studies indicate that the tidal flushing capacity of Clam Bay is limited and almost insignificant in Upper Clam Bay. The preliminary hydrographic assessment of the Clam Bay system prepared by Tackney & Associates, Inc. (August 1996) demonstrates rather dramatically that there is a significant reduction in tidal range between the middle boardwalk and Inner Clam Bay.-Tackney describes the flow in that area as "measurably reduced"and "very inefficient". This connecting tidal creek is the key conduit for tidal input and outflow to the northern reaches of the Clam Bay system and its constriction and the ancillary constriction of tributaries connecting to it, impact the quantity and quality of the flushing that can occur in Inner and Upper Clam Bay. (concurring Lewis pers.comm. 1996; Collier County Report 1996). As noted earlier, it is the daily rise and fall of the tide and the exchange of seawater between Clam Bay and the Gulf that are critical to the ability of the mangrove forest to °Page bb'03f/. 1 21 export both organic matter, and excess salt and freshwater as well as receive oxygen rich water and nutrients. (Snedaker pers. comm. 1996). The greater the tidal amplitude (or tidal prism) the greater the benefit to the mangroves - more needed resources are delivered and more wastes are removed. Conversely, in the absence of surface water circulation or tidal activity, mangroves slowly die due to deleterious changes in the sediment: (1) in the absence of oxygenated water, the sediment became anaerobic or anoxic, and (2) metabolic wastes and hydrogen sulfide accumulate in the anoxic sediment. The consequence is that the root systems dies and eventually the whole tree. (Snedaker pers. comm. 1997). Note that the tidal exchange mechanism that is critical to the health of the black mangrove forest is, within this ecosystem, seriously constrained. (Turrell 1995). Another key aspect of the surficial hydrology is the vertical location of the mean high water level elevation relative to the mangrove sediment elevation. Specifically,the mean surface water elevation, or more importantly,the mean low water (tide) elevation, has to be sufficiently lower than the mangrove sediment elevation in order for mangrove sediments to drain during low tide. A persistent high surface water elevation stops sediment drainage and, as above, results in sediment anoxia and the accumulation of toxic waste products. (Snedaker pers. comm. 1997) It should be observed that the black mangrove forest does not require the kind of intense flushing that is more typical of the red mangrove systems in order to maximize its productivity. However, the total absence of meaningful exchange is most certainly a contributor to the significant degradation of the black mangrove system within Clam Bay. (Snedaker pers. comm. 1996; Tackney 1996; Lewis pers. comm. 1996; Johnson 1996). • In this context Tackney observes that even in the absence of rainfall, the average water surface elevations for the inner bays are higher than the average surface elevation for the Gulf. Analysis of the tidal data indicates that average water surface elevations in the Inner and Upper Clam Bays are both super-elevated above the average Gulf water surface elevation by approximately 0.2 feet. This indicates that the tidal range in Inner °e.6°We.6f6b,210E4 22 and Upper Clam Bays is muted and that the system is receiving significant additional water through runoff and restricted capacity to drain additional inflow. In fact, during portions of the Tackney study no tidal fluctuation was noted in the Upper Clam Bay and only marginal tidal effects were observed in Inner Clam Bay. • The tide in the Naples area is classified as a mixed tide with significant diurnal and semidiumal components, or stated differently, on most days the system will experience two tides and for a few days each month there will only be one significant tide. (Turrell 1995; Tackney 1996). Tackney's study was intended to identify the hydraulic characteristics of the Clam Bay system and to determine if the bathymetry and geometry of the tidal creeks and bays caused or resulted in excessive periods of high water surface elevations in the Inner and Upper Clam Bays. (Tackney 1996). Tackney's study of measured tide levels within the system indicated that, as expected, tidal amplitudes diminished with increasing distance from Clam Pass. In certain areas, however, the reductions were extreme. In Upper Clam and Inner Clam Bays, for example, the average tidal ranges were less than 0.4 feet while the average Gulf tide was slightly greater than 2 feet. Even in Outer Clam Bay, which is less than 3000 feet from the pass, the tidal range was less than half the Gulf range. The reduced tidal ranges were also accompanied by relatively large phase lags. The phase lag is the average time delay measured in hours and minutes between the occurrences of slack (high or low) water in the Gulf of Mexico and the measurement stations. It is affected by both the distance between measurement stations and the amount and quality of hydraulic resistance of the connecting channel. The longer the distance and the higher the resistance, the more pronounced one would expect the phase lag to be._In the upper bays, high and low waters generally occurred over three hours later than the Gulf tides. ° 46fflf 3t/H81 2 3 These conditions indicate that the tidal creeks connecting the interior bays are hydraulically very inefficient. As a result, the upper bays are prone towards extended periods of flooding as a result of freshwater runoff and the inability of the system to drain efficiently. During Tackney's field studies of May,.1996, rainfall of approximately 4 inches in three days was adequate to flood the Upper Clam Bay above high tide levels and sustain this flooded condition for over two days. Accordingly, we conclude that the creeks and bays that serve to connect the Inner and Upper Bays are significantly less efficient in the ebb tide stage than they are in the flood stage. Studies undertaken by both Lewis Environmental Services, Inc. and Turrell&Associates inc.would support this conclusion.. (Turrell 1995; Lewis pers. comm. 1996). The system takes on and retains significantly more water than it is presently able to discharge. (Lorenz and Hatcher pers. comm. 1996; Lewis pers. comm. 1996, Wilson, Miller et. al. 1996; Snedaker, pers. comm. 1996). An additional hydrological impact on Outer Clam Bay is contributed by the Seagate culverts. As noted, three, 24-inch culverts were installed at the Seagate crossing in 1976 to provide some tidal exchange between the Clam Bay area and the Venetian Bay to the south. The culverts were allowed to flow both ways. The currents through the culverts are high, with maximum velocities exceeding 5 feet per second. This is measurably higher than the currents in the tidal creeks of the Clam Bay system. Tackney notes that slightly less than one quarter of the tidal prism (the exchange water volume in any tidal cycle) of Outer Clam Bay is from Venetian Bay via the Seagate culverts. This is consistent with current observations as the system freely exchanges water from Venetian Bay to Outer Clam Bay. Ground water inflow into the bay system is minimai.(Tackney 1996; Lewis pers. comm. 1996; Martin 1996). °PigAPIR i 3 24 Finally, an additional attribute of the system that is directly related to tidal prism and the quantity of inflow and outflow is the question of inlet stability. Inlet stability refers to a tidal inlet's capacity to adequately scour out deposited sediments and prevent inlet closure. Fora given wave environment, inlet stability is governed primarily by the volume of water(tidal prism) carried by the inlet. To remain stable, an inlet must have the characteristic that a temporary constriction in cross sectional area produces an increase in current velocities adequate to scour out the constriction. A corollary to Tackney's observations is that the velocity of the water entering the intertidal zone on a rising tide is slower than on the subsequent falling tide. This is because water movement is slowed by surface friction whereas on the outgoing tides the bulk of the water experiences no surface friction. (Snedaker pers. comm. 1996). Note, however, that since the duration of the ebb tide is also increased (Tackney 1996), the drainage velocity of outgoing tide water is decreased. This translates into a longer total period of inundation and a loss of the scouring potential. To function without mechanical intervention. the system must generate sufficient volume of water on the ebb tide to scour out the inlet naturally. otherwise the inlet will, over time. continue to close. (emphasis added) This is particularly true during periods of high wave activity and low tidal ranges. (Turrell 1995; Tackney 1996). The five closures of Clam Pass that have occurred in the past twenty years indicate that stability of Clam Pass is marginal. (Turrell 1995; Tackney 1996) (b) Freshwater Component Under predevelopment conditions, much of the area's rainfall was held on the surface of the land in sloughs and other low areas. This water would either slowly filter through the soil to recharge the shallow aquifer or move through the mangrove community to the bay. Less than ten inches of the approximately 53 inch average rainfall is estimated to have been lost from the uplands east of Clam Bay as surface runoff. The storage capabilities of the land thus moderated surface flows, preventing extremely high flow oPage 1 o635 25 rates during the rainy season and serving to maintain surface flow and groundwater flow during the dry season. (FDER 1981). In 1977 the Pelican Bay Planned Unit Development was established by Westinghouse Communities, Inc. The development contains a mixture of residential, retail, commercial and recreational facilities and lies east of Clam Bay. As a condition of development, Clam Bay, the area that lies west of the Pelican Bay and consist of approximately 530 acres of mixed mangrove forest and wetlands was designated as the Pelican Bay Conservation Area. As such, it was designated for conservation but with limited recreational access. The development of Pelican Bay had limited fill impact to the Clam Bay system, but it did modify the pattern of freshwater entering the Clam Bay system. (Wilson, Miller et.al. 1996). It is these modifications which may need further analysis. The stormwater management system as designed, permitted and implemented at Pelican Bay employs a series of detention ponds, swales and culverts to regulate the discharge of run-off into Clam Bay. Discharge occurs almost continuously along the eastern perimeter of the conservation area. Run-off from the northern end of Pelican Bay is collected and discharged into Upper Clam Bay. Irrigation water for 27 holes of golf and landscaping in Pelican Bay is obtained from the Pelican Bay Waste Water Treatment System, the Pelican Bay-offsite well field and from Collier County's North Naples Wastewater Treatment Facility. (Ward pers. comm. 1996). The relative contributions of each of these systems is approximately 0.68 MGD, 1.02 MGD and 1.43 MGD, 'respectively. The combined average volume from these three sources is approximately 3.0 MGD which approximates 26 inches per year of additional rainfall equivalent, (Wilson, Miller et.al., 1996). When added to the average rainfall for South Florida of approximately 53 inches per.year, the local area has an effective rainfall of approximately 80 inches plus annually. This is significant, particularly when viewed in the context of predictable storm events that have the potential for altering the amount o Nage 1131df�3p5ti 26 of average rainfall entering the Clam Bay system. Additionally,the 3 MGD (an average) "rainfall equivalent" is a daily event for the Clam Bay watershed and is independent of the seasonal wet-dry season. The "Pelican Bay Water Management System - Stormwater Detention Volume and Water Budget Analysis" (Wilson, Miller, Barton & Peek, Inc.April, 1996) describes the water management system as being divided into six watersheds or drainage systems. Rainfall, including irrigation, reaches the ground and either seeps into the ground or runs off to a stormwater detention area within each system. The stormwater detention plan for Pelican Bay has a standard, permitted design capacity to hold the first inch of stormwater during a 25-year storm event. The stormwater is detained for flood protection and water quality treatment. Stormwater discharge is controlled by a series of weirs designed such that the post-development stormwater run-off rate does not exceed pre-development rates. Stated differently, the system is designed to discharge stormwater in the developed portion of Pelican Bay in the same manner that it discharged stormwater prior to development. The stormwater discharge exits the weir system for a final release into Clam Bay. Stormwater runoff from an additional 130 acres of watersheds, outside Pelican Bay, contributes an additional and significant volume of discharge to Clam Bay. This water represents 7.9% of the total stormwater discharge to Clam Bay. As the area of Pelican Bay to the east has undergone development, it has increased the impervious surface area, with a concomitant increase in surface runoff, which is eventually discharged to Clam Bay. The daily irrigation water volume enhances the saturation of the uplands which reduces their ability to accommodate rainfall volume, thus effectively increasing surface and groundwater discharge. Groundwater discharge can be commonly observed throughout the eastern side of Clam Bay and is discernable as a very slight sheet flow. Where this water encounters a discharge system, even one that is not operating at peek efficiency, such as Outer Clam Bay, excess water is °Vage 114 i( . 2 7 effectively removed from the system. However, in the northern section, even the small incremental sheet flow is not efficiently removed due to lack of flow through the channels. Thus, it accumulates, increasing soil saturation and raising the mean water table elevation, and apparently overwhelming the black mangrove's anaerobic soil/gas exchange mechanisms. Mangroves in these areas have, therefore, become stressed and/or die. 3.2.2 Proposed Characteristics of Clam Bay In assessing a variety of alternatives to the restoration of Clam Bay, the need is not so much to restore the system to a mangrove forest (although that remains the primary goal) as it is to stabilize and restore the system as a thriving natural resource. We recognize that with each change in naturally induced flushing rates and hydrological regimes the mangroves will adjust by altering zonation patterns, species compositions, rates of growth and mortality, etc. (Lugo 1976). We conclude that the Clam Bay ecosystem and the Pelican Bay development are all part of an integrated and impacted system that will best function in natural ways with strategically induced adjustments imposed over time by man. The balance of this report discusses both the immediate needs of the system and the suggested maintenance needs of the-system after initial retrofitting. The management plan protocols provide the guidance to accomplish the objectives of the Plan. 3.2.2.1 Clam Pass 1 The single most important thing that can be done to restore the health of the Clam Bay system is to improve the total tidal flushing capacity of the system. (Tackney 1996; Snedaker pers. comm. 1996; Lewis pers. comm. 1996; McKee 1996; Turrell 1996; Wilson, Miller et.al. 1996). As has been discussed earlier, the tides in the upper o Page 11 0t.5 2 8 reaches of Clam Bay are weak and variable. Runoff from rainfall further reduces the interior tidal range and during Tackney's field study, total rainfall of approximately 4 inches in three days was sufficient to flood Upper Clam Bay to such an extent that tidal fluctuation was completely eliminated. In Outer Clam Bay, where the channel leading to Clam Pass is relatively short, the tidal range is only 50% of its potential value.. This diminished exchange capacity is a direct result of the constricted nature of the inlet and its adjacent interior channels. During flood tides, sand is carried into the pass by tidal currents and settles out of the water column where the currents drop below the magnitude necessary to maintain the sediment in suspension. At Clam Pass this has resulted in the gradual accumulation of sediment in the channels interior to the inlet. This sedimentation process reduces the hydraulic efficiency of the channels and results in diminished tidal ranges for the interior bays. At present, the channels immediately interior to the pass are so constricted that even when the pass is excavated,the interior tides remain muted. Efforts to maintain the pass in an open condition, therefore, could be dramatically improved by enlarging the dredge area to include not only Clam Pass, but also the critical areas of the adjacent interior channels. This action would not only augment the volume of tidal flow through Clam Pass, but would also reduce the probability of inlet closure during adverse weather conditions. Accordingly, the essential goal of the Management Plan is to augment the flow of sea water in and out of Clam Pass. As previously noted, Clam Pass is of marginal stability, however, prospects for improved tidal exchange can be materially enhanced if the pass is both deepened and widened. (Tackney 1996; Humm and Rehm 1972; Turrell 1995). It is the accumulation of sand in the ebb and flood tidal events that reduces inlet hydraulic efficiency and demonstrates why it is necessary to expand the opening to the oR�laaggAb'�fa 2 9 • Gulf beyond the range of stability indicated on the closure curves discussed in the"Clam Pass Inlet Management Plan" prepared by Turrell and Associates, Inc. (1996), in association with Humiston & Moore Engineers. They conclude in their report that expanding the magnitude of the excavation within Clam pass materially enhances the probability of creating a more hydraulically efficient cross section and therefore a more hydraulically efficient pass. (Turrell 1996; Humiston & Moore pers. comm. 1996). [See Discussion @ Section 4.5.2] The single most critical factor inducing the Upper Clam Bay mangrove die off and restricting natural regeneration of mangroves is the relative absence of adequate tidal flushing, or tidal pumping, typically measured in terms of tidal amplitude and its frequency of occurrence. Tidal pumping refers to the hydraulic change in water pressure in a mangrove sediment that is controlled largely by tidal activity. When rising tides force a rise in the water table in the sediment beneath mangroves, gasses (e.g., carbon dioxide, hydrogen sulfide, methane, ammonia) and various fluid wastes (including refactory and labile dissolved organic matter) are expelled from the sediment. Since some of these compounds are toxic, particularly hydrogen sulfide, their frequent (daily to twice daily) removal is critical to the health of the mangroves. Conversely, on falling tides and a drop in the sediment water table, gases (e.g. , oxygen) and nutrients present in the over-lying water are drawn into sediment. The frequent renewal of sediment oxygen is particularly important because it is required in normal root respiration which, if stopped, causes mortality. Thus in the absence of tidal pumping, metabolic wastes accumulate in the sediment and it eventually turns toxic and anoxic, meaning no oxygen. It is important to note that this critical process has nothing to do with the salinity, or absence thereof, or with the presence or absence of surface and subsurface water. Because the tidal amplitude is wholly inadequate mainly due to the restricted tidal circulation and tidal pumping within the Clam Bay system, and between the Clam Bay °PagiW/CAN 3 0 • system and the Gulf of Mexico,the correction provide by this portion of the Management Plan is critical to the creation of conditions required to foster mangrove growth in addition to improving and maintaining water quality within Clam Bay. 3.2.2.2. Interior Tidal Creeks It is important to recognize the interrelationship between the maintenance of Clam Pass and the maintenance of the interior connecting tidal creeks. The tides in the upper reaches of Clam Bay are weak and variable. In the absence of rainfall, the tidal ranges for the Upper and Inner Clam Bay's are in the order of 15% to 19% of the Gulf tidal range. Run-off from rainfall quickly floods the upper bays and further reduces the interior tidal range. As previously noted, during Tackney's study, total rainfall of approximately four inches in three days was adequate to flood Upper Clam Bay to the extent that tidal fluctuation was completely eliminated. The reduced tidal ranges in the interior bays are due to the restrictive condition of the interior connecting tidal creeks. (Tackney 1996; Lewis pers. comm. 1996; Wilson, Miller et.al. 1996). These restrictions not only super-elevate the average water surface elevation within the bays but also retard drainage. The problem is exacerbated by the addition of pulsed water from the stomiwater management system,which by design stores water in its detention/retention areas and then allows it to discharge into the bays. The constricted condition of the interior tidal creeks coupled with the additional water being continuously discharged into the bay can and does elevate the water surface -elevation in the upper bays and contributes to extending the periods of flooding beyond tolerance levels that mangroves can accommodate, particularly the black mangrove. (Turrell 1995; Tackney 1996; Lewis pers. comm. 1996). The sediment that has a tendency to form inside the inlet is in an area protected from wave energy and is relatively significant in size. As such it affects the inlet tidal hydraulics by restricting flow. (Turrell 1995; Humiston & Moore pers. comm. 1996). This reduces the effective tidal prism, and therefore reduces inlet stability. Stated °ROWao8bfesB 31 differently, an ancillary impact of a reduced tidal prism is a reduction in the amount of sea water that accesses the upper reaches of the Clam Bay system. As Tackney notes, "It is the enlargement of the tidal prism which is important to increasing the [tidal] flushing capacity of Clam.Bay as a whole." If the constrictions responsible for these low tidal ranges could be reduced, then the tidal prism can be significantly increased. This will not only aid in the maintenance of Clam Pass, but will also aid in the maintenance of more appropriate water levels in the interior tidal creeks and ponds of the upper reaches of the system as a whole. (Concurring Lewis pers. comm. 1996; Humiston & Moore pers. comm. 1996). Therefore, the second proposed remedial action of the plan will require that the interior tidal creeks be selectively reopened and in some cases enlarged in order to augment the transfer of water. (Concurring Tackney 1996). Removing the constriction to allow the present inflow of water will also enhance the outflow of water. These adjustments will, therefore, enhance the flood tide ingress and will allow for increased volume to exit on the ebb tide. [See Discussion @ Section 4.5.3] 3.2.2.3 Vanderbilt Lagoon Reconnection A third remedial option that has been suggested and has been reviewed involves the potential for reconnecting the Clam Bay system to the north end of Vanderbilt lagoon. The greater weight of the data suggest that such an undertaking would have a negative effect on the operational characteristics of the Clam Bay system by further reducing the magnitude of the tidal prism; a result that is at odds with the generally accepted notion of enlarging or enhancing the tidal prism of Clam Bay. (Tackney 1996; Turrell 1995; Humiston & Moore pers. comm. 1996). • Further, it is recognized that the historical connection at this point was marginal at best, and while passable at times, it was not uniformly and consistently navigable. Further, O 426M0inW 32 reference to historical photography suggest that the northern extreme of Clam Bay, like the southern extreme of Vanderbilt Lagoon, was located at the apex or node of both tidal systems and as such the flow of water into and out of these upper reaches of the two systems was limited at best. Given this historical background and viewing it in relation to the level of development and the nature of the severing that has taken place, reconnecting the Clam Bay system to Vanderbilt Lagoon in any meaningful sense would be impractical, particularly where it offers no positive contribution to the restoration of Clam Bay. Accordingly, it is not part of the Management Plan. 3.2.2.4 Seagate Culverts At the southern end of the property, adjustments to the operational characteristics of the Seagate culverts has the potential to augment the tidal prism and in doing so, allow for a more natural maintenance of Clam Pass. At present,.the three Seagate culverts at the south end of the Clam Bay system provide between 20% and 25% of the tidal exchange for Outer Clam Bay. Flow in the culverts, however, reverses with the tides and, as a result, the net exchange, when averaged over a complete cycle, is quite small. In addition, southerly flow through the culverts results in a corresponding reduction in flow through Clam Pass to the north. (Tackney 1996). By installation of flap gates or water control structures in the three culverts (originally proposed by the USEPA1n the 1970'x)water would be retained in Outer Clam Pass on the flood tides and would exit through Clam Pass on the ebb tide cycle. Such retrofitting of the existing culverts would both increase the tidal flow volume through the pass during half a tidal cycle and pump water in one direction, between Venetian Bay and Outer Clam Bay. Under present conditions, it is estimated that this one directional discharge through the culverts would be sufficient to displace the volume of water in Outer Clam Bay within approximately 7 to 10 days. (Tackney 1996). By so doing natural scouring and maintenance of the pass would be enhanced. OR042680 3 3 Page 120 o,1f 3/F58 P1 The anticipated result will be less frequent need for mechanical intervention for pass maintenance. Accordingly, the third attribute of the retrofitting of the system would require that the culverts at Seagate Road be redesigned and fitted with flap gates or a comparable apparatus to retain ebb tide flows and direct the discharge of these waters through Clam Pass. [See Discussion at Section 4.5.1] 3.2.2.5 Stormwater Management To evaluate the potential for reducing stormwater runoff into Clam Bay, Wilson, Miller, Barton & Peek (1996) was commissioned by The Pelican Bay Services Division to conduct a study of the capacity to retain additional water within the Pelican Bay stormwater management system. Their study concluded that with modification to the existing system one could add only an additional 27 acre feet of storage capacity within the system. That represents 0.7 percent of the total yearly volume of surface water flow to Clam Bay. As such there appears to be little benefit to enlarging the detention/retention areas given the cost and the physical constraints that presently exist within the Pelican Bay community, but this will be evaluated further and in relation to all other studies being undertaken under the Management Plan. The system, as presently designed, holds for discharge to Clam Bay approximately 3800 acre feet of water. Presently, the incremental benefit to be derived from-the minimal expansion capable within the existing land mass does not, as noted, suggest that this a cost effective option, but as suggested, it will continue to be evaluated. See Study No. 1 in Section 4.5.4.2. In this context it is also important to recognize that the development of Pelican Bay has been engineered and permitted through build out to provide water quality treatment and quantity attenuation to meet State of Florida water quality and quantity standards. A series of studies is proposed in Section 4.5.4 below to determine the best and most efficient way to get the right amount of water in the right place at the right time. 01'140881'dt 's 34 3.2.2.6 Upland Irrigation Water Management A related attribute of the freshwater management system of the Clam Bay ecosystem is the quantity and quality of water used within the Pelican Bay community for irrigation • purposes. Irrigation water for the developed areas of Pelican Bay, including a 27-hole golf course, is obtained from an effluent re-use system. As previously noted the combined average volume of irrigation water for the community is approximately 3.0 MGD or a rainfall equivalent of 26 to 28 inches per year. We hypothesize that there is high level of soil saturation in the upland areas of the Pelican Bay development and as such the continued application of this additional amount of water may serve to reduce the ability of the upland soils to accommodate abnormal rainfall volumes. This results in increasing surface and groundwater discharge which, when accompanied by extraordinary storm events and excessively wet rainy seasons, as occurred over the last several years, essentially results in a much speedier release of water to the Clam Bay system than would have otherwise been the case. An examination of the stormwater management and effluent disposal system suggest adjustments to the disposal of treated effluent within the developed area of Pelican Bay is required to make certain that the amount of treated effluent or water discharged does not exceed the assimilative capacity of Clam Bay. At present the assimilative capacity is not known and gaining an understanding of that going forward will be an important part of the management-undertaking: Modifying the water consumption pattern of the Pelican Bay community and developing a phased change in the mix and type of vegetation used in the common areas of the developed community should be examined to determine,what, if any,opportunities may exist to reduce the irrigation needs of the community. In this context consideration of the adoption of Best Management Practices (i.e. rain sensors, irrigation head modifications, watering pattern adjustments, modified planting palettes, etc.) for the installation and maintenance of landscaping and irrigation equipment will produce some oxcsg 6 $+8 35 benefit to the system. Additionally, improvements to the Clam Bay ecosystem will be achieved by reducing and/or modifying the amount of irrigation water used by the Pelican Bay community. While the pass has closed on a variety of occasions, the system, while stressed, retained its basic health throughout all of those closures until the most recent rain events. This suggests that with significantly improved tidal flushing, the system does have the capacity to take on larger amounts of water than rainfall alone would normally contribute and to do so on a regular basis as contemplated by the stormwater management system. Improved management of the system will allow for the development of operational directives that balance these two objectives and allow for the adjustment of irrigation disposal when the level of inundation within the soil column reaches predetermined levels of saturation. This initiative should also include a review of the management practices for the administration and discharge of the first-flush stormwater runoff and the adoption of Best Management Practices to insure that such stormwater runoff will have minimal adverse impacts on the water quality of the riparian habitat adjacent to the Pelican Bay development. [See Discussion @ Section 4.5.4] 3.3 Recreation 3.3.1 Current Recreational Component. For the most part, Clam Bay remains inaccessible to the general public. Because significant portions of the bay are and remain densely populated with mangrove vegetation, it (the bay) is physically difficult to traverse on foot. The three boardwalks which do cross the bay provide access to the beach and, as a general proposition, provide the level of access to the mangroves that the public demands; a visual, non- consumptive utilization. ° a4f43 bf§'Eg• 3 6 Limits on the amount of beach access is also controlled by limiting utilization of the boardwalks to differing segments of the public. Membership or resident status within Pelican Bay is required to use both the northern and middle boardwalk, thereby providing a predictable amount of use that to date has not proved problematic. The southern boardwalk is accessible by the public at large and while it generates measurable amounts of increased traffic, the established train and foot traffic has not adversely affected either the estuary or the beach. Canoeing of the waterways within Clam Bay remains a popular activity for those seeking a more intimate look at the estuary, and its wildlife or those seeking solitude in the upper reaches of the bay. Fishing is also a frequent undertaking from either the boardwalks or canoes. Swimming is confined to the beach area, although there is a reasonable amount of wading in Clam Pass and back into the estuary as much as 1,000 or so feet from the mouth of the Pass. The use of motorized watercraft is not prohibited, and evidence of periodic use of such is evident from observation. For the most part, the accumulation of sediments and the shoaling that has taken place has resulted in physically limiting the accessibility of Clam Bay to deeper draft boats and particularly those equipped with engines. Most, if not all, of the motorized boat traffic is believed to originate in the Seagate residential area and be confined to the area from Outer Clam Bay to Clam Pass. 3.3.2. Proposed Recreational Component. The Management Plan would not anticipate any changes in the recreational use characteristics of Clam Bay. The contemplated widening and deepening of Clam Pass and the interior channels leading into Outer Clam Bay will not measurably improve navigability. Earlier assumptions to the contrary have proved to be inappropriate as the channel area itself remains very confined. Further, since no dredging of Outer Clam Bay is proposed, accessability across the same will not be noticeably improved. "W1 4 of 35E'1 37 Presently, Collier County has enacted Ordinance 96-16 which Ordinance provides for the utilization of the Clam Bay area by motorized watercraft provided that they operate with no wake and at idle speed. The Management Plan recommends no change in that protocol. The PBSD will however, in cooperation with the County, vigorously enforce the existing Ordinance. Further, if significant adverse impacts to the natural resources and water quality of the Clam Bay system are confirmed by the Collier County Department of Natural Resources, the FDEP and the Corps environmental staffs to be directly attributable to the use of motorized boats within the Clam Bay system, then additional restrictions or adjustments in the use of motorized boats within the Clam Bay system shall be considered for imposition to insure that the ecological integrity of the Clam Bay system Is preserved. To the extent that additional constraints on the use of the Clam bay system are at any time in the future determined to be necessary to preserve the ecological integrity of the Clam Bay system, such constraints will be imposed only so long as is necessary to ensure that the damaged resources within the Clam Bay system have recovered and/or the water quality has returned to and will continue to meet state water quality standards for those parameters associated with boating and motorized vessel usage including copper, cadium, zinc, hydrocarbons (PAHs) oils and greases, dissolved oxygen total nitrogen, total phosphorous and total fecal and coliform bacteria. Appropriate notification, signage and policing will be provided by the County or PBSD to ensure compliance. The signage will be strategically placed both at the entrance to Clam Pass and in the areas around the boat ramp located at the southern end of Outer Clam Bay. These are intended to insure that persons accessing the Clam Bay system are informed of its unique ecological characteristics, the limitations of access resulting from variations in water depth, the existence of no wake/idle speed requirements for motorized boat operation and importantly,the necessity of staying out of areas identified as having maturing seagrass beds and potential manatee habitat. Precise locations and language to be included in the signage will be determined in cooperation with the agencies post permit issuance. Finally, the main channel will be marked in accordance oFiS618235; / 3 8 with the requirements imposed by the United States Coast Guard to insure that those who use the system clearly know where the channel is and the prohibitions against operating their water craft outside the same. Additionally, the enlargement of the tidal exchange mechanism creates potentially hazardous conditions at the mouth of Clam Pass. Historically, this area has noticeable tidal movement, but is gentle enough to allow free swimming and wading. The adjustments contemplated here are likely to result in tidal movement that can be hazardous except to the strongest of swimmers. Channel depths will prohibit most wading, particularly during a high tide. Appropriate warning signs and monitoring of human use in the Clam Pass area will be required post implementation of the Management Plan to insure the safety of beach users. • oFtPav6ed 3 9 Page 127 of 358 4.0 IMPLEMENTATION 4.1 Approach The Clam Bay Management Plan is a guidance document that will be modified through time to address new opportunities and problems that affect the Clam Bay (See Section 1.0). The Management Plan is based on available technical information and was evaluated based on the goals established by the PBSD. The recommended management options involve a variety of technical disciplines and expertise, and in some situations specialized equipment will be required. Implementation and completion -of the management options is the responsibility of the PBSD. The PBSD Advisory Board consists of fifteen (15) members that provide an implementation, overview and policy-making function. Implementation of each management option will require the development of a detailed action plan. The present staff, with guidance from the Advisory Board , technical assistance from their consulting engineers and scientists, and, in some instances, other specialized consultants have prepared the required action plans for the management options. Some of the management options can be completed entirely by PBSD staff. Other management options will require outside contractors to complete. 4.2 Action Plan Development - The purpose of each action plan is to provide a detailed description of the work required to complete a management option. The action plans are to be used by the PBSD staff for their own guidance, to assist in the preparation of bid documents for contractors, as the deliverable element of contracts, as proposals for soliciting outside funding and as part of their annual planning process. • ° age 12h13FP1 4 0 The action plans are set forth below and are contemplated to be permitted by applicable governmental authority. In the future they should be developed as part of the annual planning process, although they can be developed for unforeseen management needs at any time. An action plan should contain the following minimum information: • Project purpose; • Project benefits; • Detailed scope of work; • Expected deliverables or product; and • Schedule. Each action plan, depending on its purposes(proposal, bid document, etc.), may include permit requirements, estimated costs and evaluation criteria. The purpose of developing evaluation criteria would be to determine the success/failure/problems associated with each management option. To provide guidance in developing the action plans two important elements were evaluated. First, potential permit requirements for each management option were reviewed and second, a list of cost estimates for selected management option components were identified. 4.3 Management Plan Evaluation, Planning and Funding 4.3.1 Evaluation and Review The Clam Bay Management Plan is a dynamic document and will require review and evaluation on an annual basis. The review and evaluation of the Management Plan should include the following: • Evaluation of past projects, successes/failures/problems; • Review of work in progress; OR042680.1/FP1 41 Page 129 of 358 • Evaluation of potential funding sources; and • Selection of projects for the upcoming year. The degree of success for a particular restoration project is generally based on percent • survival of the vegetation, but in this instance the monitoring criteria specified in the Management Components (Section 4.5) should be the gauge. The environmental enhancement restoration and habitat management options discussed in Section 4.5 will require a Section 404 Permit from the Corps of Engineers and a Joint Coastal Permit from the Florida Department of Environmental Protection. These permits will specify requirements for determining overall project completion and success and more specific requirements for implementation and monitoring. The Management Components (Section 4.5) are designed to anticipate the permitting requirements for the first tier restoration effort. Successive efforts will be undertaken within the context of agreed upon permit conditions thereby allowing the PBSD to maintain the components of the Management Plan and act upon the same within defined parameters as specified in each management option and as permitted by the government. The review and evaluation process will include PBSD staff and commissioners, their consulting engineers,scientists and other technical consultants as required. The annual planning process will include not only public input, but the outcome of the process, including the establishment of the following year's goals and objectives. This review, evaluation and planning process will correspond to the PBSD fiscal year budgetary planning. The process will begin in April with public meetings. This would allow the month of August for finalization of the plan, followed by implementation in October, but always subject to constraints imposed by other adverse ecological impacts or the potential for the same, such as turtle nesting season and the like. ° age 4 2 • The Management Plan is to be funded initially by an assessment of the Pelican Bay resident base under the direction of the PBSD, by a contribution of$1,000,000 from WCI Communities and by Collier County. Funding priority and availability of funds will change yearly. It would, therefore, be appropriate during the annual planning exercise to closely evaluate funding availability and determine sources for both immediate and long term needs. 4.4 Implementation Schedule Established Management Plan schedules can be used as a tool for implementation and budgetary planning. Based on present information, a one year implementation schedule is proposed for all Management Plan options except those set forth in Section 4.5.4 dealing with freshwater/stormwater studies and adjustments. Figures 4.4(a) and (b) detail the anticipated schedule for both the restoration activities and the various studies described in Section 4.5.4 below. An annual review and update of the Management Plan will allow the PBSD to be more responsive to various programs needed for maintenance of the system. This schedule, as with the Management Plan, is dynamic and is expected to and should change through time. The schedule is designed around an annual review and update. The prioritization of the approved management options is based primarily on the decision matrix review discussed earlier and taking into account the complexity of the management option and the capabilities of the PBSD. 4.5 Management Components The Management Components described below are the activities to be undertaken presently in support of the goals described in Section 1.3 above. While each 01194049i 30§gb 43 component can stand alone for purposes of its individual evaluation, it is the integration and cumulative impact of all that assures restoration success within Clam Bay. 4§2 a6BE1 44 4.5.1 Seagate Culverts 4.5.1.1. Existing Conditions The Seagate Culverts are located at the extreme south end of Outer Clam Bay and serve as the connection point to Venetian Bay to the south. The culverts allow water to be exchanged between Outer Clam Bay and Venetian Bay through three twenty-four inch diameter culverts. The culverts are topped by Seagate Drive, a private thoroughfare connecting to developed land lying adjacent to the Gulf of Mexico. (See Figure 4.5.1(a)) The culverts are organized so that they lie parallel to each other in a north-south direction. The end walls on either side consist of sand cement bags and rip rap. The present condition of the system suggests that the culverts and supporting structure is stable and reasonably well maintained. Some disruption of flow appears evident from time to time suggesting some impediments may exist in one or more of the culverts. Although the culverts are physically located much closer to Clam Pass than to Doctors Pass (the access point to the Gulf for Venetian Bay), flow in the culverts is dominated by flow through Doctors Pass. This condition results because the tidal amplitude in Venetian Bay is approximately twice that in Outer Clam Bay. Flow measurements taken at the culverts show exceptionally high velocities, approaching in magnitude rates of up to five (5) feet per second. Volume measurements based on the tide in Outer Clam Bay and flow in the culverts indicate that between 20% and 25% of the tidal flow for Outer Clam Bay is supplied by the culverts. Notwithstanding a surprisingly high flow rate, the culverts contribution to flushing exchange for either Clam Bay or Venetian Bay is negligible. This result occurs ° agRMAg. 45 because the flood volume is generally equal to the ebb volume and flow through the culverts simply oscillates back and forth between the two bays. • 4.5.1.2 Proposed Conditions. The Management Plan intends to take advantage of the flows through the culverts on the flood cycle by retaining the volume of water generated on the north side of the culverts (the Clam Bay side) for discharge through Clam Pass. This is to be accomplished by the installation of Red Valve Tideflex check valves (or equivalent). This product is designed to preclude the oscillation of the tides through the culverts. This undertaking has no detrimental impacts on the Venetian Bay side of the culverts and was selected because it has the lowest head losses and requires minimal maintenance. Neither ebb flows through Doctors Pass nor water quality will be negatively impacted. Data confirms that the volume of water carried by the Seagate Culverts is in the order of 700,000 cubic feet each half tidal cycle. However, the net flow, averaged over a full tidal cycle is very small because the ebb volume essentially equals the flood volume. This means that the same volume of water carried from Venetian Bay into Outer Clam Bay on a flood tide is returned to Venetian Bay on the following ebb tide. The volume of water (tidal prism) that flows through Doctors Pass on an average tide is about 24 million cubic feet. (Tackney 1997): Accordingly,- the Seagate Culverts carry the equivalent of slightly less than 3% of the flow through Doctors Pass. Modified as proposed, the culverts will effectively operate as a pump, pushing water from Venetian Bay to Clam Bay. Each flood tide would produce a one directional pulse of water from Venetian Bay to Outer Clam Bay. Importantly, this pulse would not be returned to Venetian Bay, but would gradually be displaced towards Clam Pass by each successive tide. Such a system would increase the exchange rate for all of the bays • °RlNg8°3d1t19s 4 6 between the two inlets and, since most days would produce two pulses, even a modest discharge rate would be capable of replenishing the bays within a short period of time. In this context it is important to observe that Doctors Pass is a very stable inlet and the tidal prism is capable of maintaining a fixed cross sectional area. This does not mean that shoals cannot develop, but it does mean that the pass is not in danger of closure. The Doctors Pass system.has.adequate_reserve.tidalprism-that even a 3% reduction, which is the maximum amount that could occur from a total closure of the Seagate Culverts, would not materially affect inlet stability. Our studies suggest that the installation of flow control valves coupled with the excavation of Clam Pass can be expected to produce an approximate 2% reduction in flow through Doctors Pass. From the characteristics of the Doctors Pass system as reported in the "Doctors Pass Comprehensive Inlet Management Plan, 1994", a change of this magnitude would not produce any measurable affects on either inlet stability or shoaling pattern. (Tackney 1997). By supplementing the tidal flow volume through Clam Pass on a recurring basis it is anticipated that there will be less frequent need for mechanical intervention for pass maintenance as natural scouring of the pass will be enhanced. 4.5.1.3 Timing The Seagate Culverts work will proceed following the first phase of improvements contemplated under the Management Plan. This timing is necessary in order to minimize impacts on residents requiring access to their property during the construction/installation phase. The completion of the check valve work is expected to assistin the maintenance of water quality by accelerating the dilution and transport of released slurry water to the Gulf resulting from the dredging of the main Channel Cuts 4A through 4D. (See Section 4.5.2). Construction is estimated to take approximately six weeks from on site mobilization and no impediments to implementation are anticipated, once permitted. This timing assumes that the condition of the culverts will allow for the retrofitting described below. a4ge6135 of 358 4 7 4.5.1.4 Design The design of the improvements to the Seagate Culverts will require the replacement of the Seagate Culverts. Additionally, the design will require a check valve that is • appropriate for the tidal conditions encountered at the Seagate Culverts and which check valve can be installed and maintained in a cost sensitive way. As noted above, the PBSD proposes to use .a tide.check-valve-manufactured by The Red Valve Company. The selected valve is specially designed for marine conditions, operates automatically with a small head differential, and is low maintenance. The check or culvert valve detail is shown on Figure 4.5.1(d). The valves will not be directly connected to the culvert ends so as to eliminate the possibility of failure of the culvert barrels due to the weight of the valve. To overcome this problem, a properly anchored end wall will be constructed around the northern ends of the three culverts and the valves will be secured to the end wall. The area beneath and waterward of the end wall will be rip-rapped to provide erosion protection and to provide a sediment trap. The south end of the culverts (Venetian Bay side) will remain as is. See Figures 4.5.1(b) and (c). 4.5.1.5. Construction Construction of the improvements described above will require in the first instance the obtaining of appropriate access to the Seagate Culverts. The culverts are privately owned by the Naples Cay Master Association and in order to complete this portion of the Management Plan, an Access Easement must be obtained and recorded in the public records of Collier County, Florida. Additionally, the City of Naples must independently issue its Dredge and Fill Permit in order to implement this portion of the Management Plan. Based on preliminary submittals to both the owners of the Seagate Culverts and the City of Naples staff, appropriate approvals can be obtained. mighlye6fiti 2,004 4 8 Construction of the improvements will require excavation around the northerly end of the culverts, placement of a coffer dam during construction of the end wall, placement of the check valves, backfilling behind the end wall, and installation of rip-rap. A backhoe will be used for excavation and coffer dam construction, a crane for setting forms, steel, and valves and a dump truck for removal of excess material. Existing plant material will be removed and preserved for.reinstallation to the extent feasible. If lost, it will be replaced with like kind material to the end that upon completion of the work the road and culvert area will be fully restored to its pre-construction appearance. Any destruction of roadways will be repaired. Best management practices will be utilized during all phases of the construction and appropriate silt retention devices and the like will be used in order to minimize siltation during the construction process. (See Figure 4.5.1(e1) and (e2)). 4.5.1.6 Post Construction Management Post construction operation and maintenance is not anticipated to be significant. The design of the system is intentionally passive in its operational phase and while the structural integrity of the system will be checked monthly, repairs and/or maintenance are not expected in the early years. To the extent required they will be made immediately. 4.5.1.7 Pre-Construction Monitoring Flow meters will be used to monitor two (2) complete tidal cycles prior to construction of the culvert modifications to determine the quantity of the water flowing through the culverts. See also Section 4.5.6.5 below. ° age1 g'o]ff3F i 4 9 • 4.5.1.8 Post-Construction Monitoring Culvert flows will be monitored post-construction through two (2) complete tidal cycles and every other month for two (2) years to determine consistent operation of the flows through the culverts and to quantify water amounts being retained in Outer Clam Bay. Subsequent monitoring of culvert flow will be evaluated following completion of the former protocol and adjustments, to the same;..will.besubmitted to the FDEP and the Corps as appropriate. Water quality monitoring is not undertaken independently in this location, but is addressed in Section 4.5.6.3 below. *98 arssa 5 0 Page 139 of 358 4.5.2 Clam Pass 4.5.2.1 Existing Conditions The tides at Naples are classified as "mixed" with significant diurnal and semi-diurnal components. This means that most days experience two tides. On a few days each month, however, there is only one tide. The data for the Gulf tides in the project area are given below: Mean range 2.01 ft. Diurnal (daily) range 2.88 ft. MHW(Mean High Water) 1.50 ft. NGVD MLW(Mean Low Water) -0.51 ft. NGVD • Although Naples is located approximately midway between the primary tide station at Key West and St. Petersburg, the tides at Naples do not correlate well with the tides at either location. Predicted tides at Naples are based on the reference station on St. Marks River (Appalachee Bay). It should be noted, however, that frequent and significant differences occur between the predicted and actual tides in the Naples area even in the absence of storm conditions. When considering the effects of tides, it is important to note that the average water- surface elevation in the Gulf of Mexico is not constant but shows significant seasonal variations. In the Naples area, the lowest average water surface elevations occur during the months of January and February at which time the average elevation is approximately 0.7 ft. below the maximum value which occurs during September. This means that the same tidal range will produce water surface elevations in September that are approximately 0.7 ft. higher than those produced in January and February. It is also significant to note that the annual average water level for the Gulf of Mexico is approximately 0.5 ft. above NGVD. aRD426184VgFP1 51 Page 140 of 358 Field studies revealed two different conditions that contribute to the observed mangrove mortality. The tidal creeks leading north from Clam Pass and the two upper bays are surrounded by a berm with a crest elevation of between approximately 1.4 and 1.8 ft. NGVD. Landward of this berm the ground elevations generally decrease and then rise • again. As a result, the berm functions as a dike which separates the tidal creeks and upper bays from smaller embayments within the mangrove forest. Under present conditions, normal high tides seldom exceed the crest of the berm and • therefore the interior bays are effectively isolated from normal tidal exchange. However, during storm conditions and exceptionally high astronomical tides, the berm is overtopped and the interior bays are flooded. As the tide lowers, these smaller interior bays do not drain below the elevation of the surrounding berm. Moreover, these interior bays remain flooded until evapotranspiration and ground water seepage lowers the water surface elevations. Water loss from these two causes, however, is relatively slow and weeks may occur before water surface elevations within the isolated bays return to the average surface elevations of the adjacent tidal creeks and primary bays. [See Section 4.5.3 for a more complete discussion of this condition.] The second condition which contributes to prolonged periods of flooding results from the existing geometry and bathymetry of the bays and connecting tidal creeks and flow channels. The tidal creek leading north from Clam Pass is narrow and extremely sinuous. Although the average creek depth is approximately -2.5 ft. NGVD, two areas of localized constriction were noted and in one of these areas, the maximum creek depth was less than -1 ft. NGVD. In addition, the northern end of the creek connecting Inner Clam Bay and Upper Clam Bay is extremely constricted. These local constrictions are shown in Figure 4.5.2(a) which is a plan view of the primary creeks, channels and bays. To determine the effects of the creeks and local constrictions on tidal exchange, tides were recorded throughout the Clam Bay system in May and June 1996 and again in • OR042680;1/FP1 52 Page 141 of 358 January and February 1997 at the recording stations shown in Figure 4.5.2(a). The May 1996 measurements were taken about 1 month after Clam Pass was artificially reopened. By January 1997, much of the channel, excavated in reopening the pass, had shoaled and the pass appeared to be again approaching closure. These changing conditions of the Pass and approach channels are noted because they significantly affected the tides throughout the bay system. The tide recordings also showed that the water surface elevations in the upper bays were strongly affected by rainfall and therefore the tide measurements were divided into two groups: days without significant rainfall or runoff and days with significant rainfall or runoff. For tide measurements taken without fresh water inflow in 1996, the average tidal range in the Gulf of Mexico was approximately 2.10 ft. In Inner and Upper Clam Bays, the average tidal ranges were approximately 0.38 ft. and 0.31 ft. respectively. These values correspond to relative tidal ranges (tidal range at site divided by Gulf range) of 18% and 15%. It is interesting to note that similar water level readings taken in 1978 (Hydrographic Study Clam Bay System, Collier County, Florida, February 1978, Gee & Jenson Engineers, Architects, Planners, Inc.) indicated slightly lower tidal ranges in the upper bays. In this previous study, however, no attempt was made to identify the effects of rainfall and, had runoff effects been isolated, the observed tidal fluctuations would have been larger. It is important to note, and this study indicates, that as much as 19 years ago, the flow into the upper bays was very restricted. Days with heavy rainfall during the field studies were very limited. Between May 19 and May 21, 1996, however, four inches of rainfall occurred. Water surface readings in Upper Clam Bay showed that for the days following this event the water level remained above the normal high tide level and tidal fluctuations were immeasurable. In Inner Clam Bay, similar conditions were noted. Small (<1 inch) tidal fluctuations, however, could be identified. ono A1412 a/31931 53 From the water surface readings, the average water surface elevations of the upper bays were found to be greater than 0.2 ft. higher than the average Gulf elevation. The effects of these conditions are illustrated in Figures 4.5.2(b). This Figure shows an approximate mean tidal cycle for the Gulf and Inner Clam Bay in mid 1996. The most obvious features of this Figure are the reduced bay tide and the large phase lag, the same being defined as the time delay between the occurrence of slack water[high or low tide] in the receiving waters[Gulf of Mexico]and the bay. between the Gulf tide and the bay tide. Other less obvious features include the set-up or superelevation (0.2 ft.) of the average bay elevation above the average Gulf elevation and the distortion between the flood and ebb stages of the tide. For the Gulf tide, the durations of the flood and ebb stages of the tide were approximately equivalent (6.2 + hrs.). For the upper bays, however, the average flood duration was approximately 5.7 hrs and the average ebb duration was approximately 6.7 hrs. Since the ebb discharge volume must equal or exceed the flood volume, the average flood velocities exceeded the average ebb velocities because they occurred for shorter durations. Additional tide readings were taken in January and February 1997. These readings showed that between June 1996 and February 1997, the relative tide range for Upper Clam Bay had decreased from 15% to approximately 9% of the Gulf range. The reduced tides in the upper bays are due to the high resistance to flow offered by the tidal creek and the reduced tidal range at the southern entrance to the creek. In addition, runoff from the surrounding drainage basin can exceed the drainage capacity of the tidal creeks and result in prolonged periods when the upper bays remain flooded above normal tide levels. The set-up and asymmetry between the ebb and flood stages of the tide are due primarily to the shallow characteristics of the waterways. Resistance to flow is inversely related to water depth. As a result, the same waterway will afford higher relative resistance when the water depths are shallow than when they are deeper. Since high tides in the bays are governed by relatively efficient inflow during the later stages of a flood tide, when water depths are near maximum, and low tides are OR042680;1/FP1 54 Page 143 of 358 governed by the relatively inefficient outflow during the later stages of an ebb tide, when water depths are near their shallowest, the bays may be considered to fill more efficiently than they drain. This condition superelevates the average water surface elevation in the bay and since the ebb volume must equal or exceed the flood volume, it also prolongs the duration of the ebb tides. Figure 4.5.2(c) illustrates the cumulative frequency..distributions for the water surface elevations in the Gulf and the two upper bays during the May and June 1996 field studies. The ordinate(vertical axis)shows the percentage of time that the water surface elevations exceeded specific values (referenced to NGVD) at the three stations. The most significant features to be noted are that the average water surface elevation in the bays exceeded 1.0 ft. NGVD 50 percent of the time and the water surface elevation in the bays never dropped below a value of 0.6 ft. NGVD. In reviewing this Figure, it should also be noted that the average water surface elevation for the months of May and June is usually in the order of 0.3 ft. lower than the average water surface elevation for late summer and early fall. Therefore, water levels during the normal rainy season would be expected to exceed the elevation shown in the Figure by approximately 0.3 ft. In May and June 1996, the measured tide in Outer Clam Bay was approximately 50% of the Gulf tide and by February 1997, the bay tide had dropped to approximately 35% of the corresponding Gulf tide. Although these ranges are substantially greater than the tidal ranges in the upper bays,they still represent high resistance to flow between Outer Clam Bay and Clam Pass. For comparison, it may be noted that the relative tidal range for Venetian Bay, which is approximately two miles north of Doctors Pass, is over 95%. By contrast, Outer Clam Bay which is less than 'A mile from Clam Pass currently has a tidalOrange of 35% of the Gulf range. In addition, tidal exchange to Outer Clam Bay is not restricted to Clam Pass but also occurs through three 24 inch diameter culverts under Seagate Drive. These culverts connect Outer Clam Bay to Venetian Bay. During flood tides, flow is toward the north while during ebb tides, flow is towards the south. OR042680;1/FPi 55 Page 144 of 358 Although the culverts are small (<10 square feet total cross sectional area) they carry exceptionally high flow velocities. Readings taken in May 1996 indicated that flows frequently exceeded five feet per second. As a result, in May 1996, flow through the culverts contributed between 20% and 25%of the tidal exchange volume for Outer Clam Bay and this percentage has undoubtedly increased since the pass has become more constricted. It should be noted that, although the culvert flow is relatively high, it does little to improve exchange between Outer Clam Bay and the Gulf of Mexico. This is because flow in the culverts reverses with the tides and most of the water carried north during a flood tide is returned to Venetian Bay on the succeeding ebb tide. [See Section 4.5.1 for more analysis.] Figure 4.5.2(d) shows representative water depths, referenced to NGVD, for the major bays and creeks within the Clam Bay system based on measurements taken in May and June 1996 and January and February 1997. A number of pertinent features can be noted. Except for the first approximate 800 feet of channel inside Clam Pass, the water depths between the pass and Outer Clam Bay are relatively uniform and exceptionally shallow. The average depth of the tidal creeks is approximately-2.5 ft. NGVD. In three areas, however, the creeks are severely constricted with depths in the order of-1.0 to -1.5 feet NGVD. The easiest method of illustrating the effects of water depths and constrictions on the tides in the upper bays is to consider two models for the bay system. The first model, shown in Figure 4.5.2(e), includes only Clam Pass, the entrance channel, the tidal creeks and the northern bays. In this Figure, the actual and relative tidal ranges are shown. At the southern entrance to the tidal creek, the relative range for May and June 1996 was approximately 71% and in the two upper bays the relative ranges are approximately 18% and 15% respectively. OR042680;1/FP1 56 Page 145 of 358 To increase the relative range at the southern end of the tidal creek, it will be necessary to reduce the hydraulic resistance between the pass and the creek. This can be accomplished by excavation. An indication of the effects of such excavation can be • obtained by noting that approximately one (1) month after the pass was reopened in April 1996, the relative range at the entrance to the tidal creek was approximately 71%. Since the time of those measurements, the pass and the channel have shoaled significantly and at present,the-relative tidal range-at-the.entrance.to the tidal creek has been reduced to approximately 55%. This recent shoaling also illustrates the fact that the tidal flow in the pass is inadequate to maintain efficient interior channels. This condition will be further discussed later in this report. The restricted condition of the tidal creeks also dramatically reduces the tidal range in the upper bays. This reduction is due to the relatively small cross sectional dimensions of the creek and its sinuous nature. It may also be noted that the creeks are not of uniform depth and that in three areas, the depths are significantly less than the average depth. Excavation in these areas to enlarge them to the average cross section of the creek will significantly increase tidal flow in the creek without the destruction of mang roves. In the second model, shown in Figure 4.5.2(f), the entire bay system is represented. The interior bays, however, have been simplified and are shown as an upper storage - area (tidal creeks, Inner Clam Bay and Upper Clam Bay) and a lower storage area (Outer Clam Bay). This presents a somewhat distorted perspective of the system since the surface area of the upper bays and mangroves is physically much larger than the surface area of the system north of Clam Pass is physically much larger than the portion of the system to the south of Clam Pass. It should by noted, however, that the tidal ranges for Inner Clam Bay and Upper Clam Bay are less than one third the tidal range in Outer Clam Bay. As a result, the tidal flow volume to the lower storage area is approximately twice the flow volume to the upper storage area. OR042680;1/FP1 57 Page 146 of 358 This model is helpful in illustrating the conditions that are responsible for the periodic closure of Clam Pass. This pass is an unimproved, marginally stable tidal inlet. The controlling cross section is small and variable. In 1995, this section was measured to be approximately 60 square feet NGVD, although it was enlarged to approximately 495 square feet where the pass was last reopened. By January 1997, it had shoaled to a cross section area of approximately 40 square feet. In the past 20 years, the pass has closed on at least five occasions;-the most recent of which was in January 1996. After each closure,the pass was reopened by excavation following various periods of closure. In all but the most recent reopening, excavation was restricted to the area of the inlet throat. In April, 1996, however, a channel slightly over 600 feet in length was excavated. At present, much of the excavated channel has silted in and the pass appears to be approaching closure. The reason that the pass has closed so often is that the tidal prism (volume inflow during a tidal cycle) of the inlet is inadequate to scour out sediment carried into the pass by wave generated Iongshore transport. Inlet stability occurs when equilibrium is maintained between the self scouring capacity of the inlet and the sediment load generated by wave activity. A necessary condition for stability is that any constriction of the inlet cross sectional area must result in an increase in flow velocities. From the closures that have occurred in recent years, it is apparent that the existing tidal prism for Clam Pass is inadequate to maintain the pass open for prolonged periods. In addition, the periods between closures appear to be decreasing indicating that the restricted condition of the interior waterways is continuing to deteriorate. It is also apparent that future efforts to reopen the pass will provide, at best, only temporary relief if excavation is restricted to the vicinity of the inlet throat.. To fully appreciate the condition of the pass, it is helpful to note a distinctive feature that makes Clam Pass different from other tidal passes or inlets. For most tidal inlets, the throat represents a relatively short section of channel with a high resistance to flow O12042680;1/FP1 58 Page 147 of 358 bounded on both sides by relatively efficient bodies of water. For Clam Pass, however, not only is the throat constricted but the approximate 2600 feet of channel leading to the primary storage area (Outer Clam Bay) is also severely restricted. A similar condition exists north of the pass but since the upper storage area is much smaller than the lower storage area, the effects are less significant. The restricted (shallow) condition of-the-entire channel between Clam Pass and Outer Clam Bay explain why previous efforts to reopen the pass have had only temporary success. In order to significantly increase the tidal prism of Clam Pass, it will be necessary to re-establish an efficient flow channel between the pass and Outer Clam Bay. Excavation restricted to the vicinity of the pass only addresses a small portion of the problem and is inadequate to materially improve the tidal prism. 4.5.2.2 Remedial Alternatives If the flooding tendencies of the upper(northern) bays are to be reduced, the hydraulic efficiency of the tidal creeks will have to be improved and openings will have to be made in the berms surrounding the isolated smaller bays (a discussion of existing and proposed efforts to re-establish flow to the isolated interior bays can be found in Section 4.5.3 below) and an efficient flow channel will have to be maintained between Clam Pass and the southern terminus of the tidal creeks. There are, however, limitations on the extent to which these objectives can be realized. Avoiding further damage to the existing mangroves is of paramount importance, and accordingly, the creeks cannot be randomly straightened nor widened. This limitation greatly restricts the effectiveness of creek excavation since much of the flow resistance is due to the sinuous nature of the creeks and their relatively small cross sectional dimensions. 0R042680;1/FP1 59 Page 148 of 358 • Field studies, however, identified three areas of severe constriction which can be improved by localized excavation. To enlarge these areas to average cross sectional areas of the adjacent creeks, an excavation depth of-3 ft. NGVD is required. This depth is approximately % ft. deeper than the average creek depth, but, since some of the constricted creek widths are narrower than the average creek width, a deeper depth is required to produce an equivalent cross sectional area. From the severe shoaling of Clam Pass that occurred in the nine (9) months since the pass was last reopened, and the further reduction of the tidal range in the primary bays, it is apparent that removing the constriction in the tidal creeks will provide only temporary relief unless the stability of the pass is also improved. As previously noted, inlet stability can be improved only by increasing the tidal prism of the inlet and this can be most effectively accomplished by excavating an efficient flow channel between the pass and Outer Clam Bay. South of Clam Pass, the channel leading to Outer Clam Bay is relatively broad and exceptionally shallow. In addition, scattered grass beds can be readily identified. Meandering through and around the grass beds, is an existing channel which contains intermittent remnants of seagrasses. Portions of this channel are of adequate width to allow for excavation of an effective flow channel to Outer Clam Bay without encroaching on the seagrass beds. However, in order to achieve the desired improvement in tidal prism, some encroachment into the seagrass beds will be required. The Plan, however, minimizes those impacts by aligning the proposed excavation to avoid the most mature seagrasses within the system. An alignment of the channel is shown on Figure 4.5.2(g)(1) through (3). Importantly, the areas to be impacted represent less than 19% of the total area to be excavated and less than 1/3 of an acre of total impacts to seagrasses generally. Notwithstanding the relatively minor impacts to existing seagrasses, the PBSD recognizes the importance of the seagrasses within the Clam Bay system. As such, PBSD believes that the overall improvement in water quality and tidal exchange will insure the reestablishment of those seagrasses lost as °Page 149 Hof 3581 6 0 a result of Plan implementation and will, if after five years of operation of the Plan, provide for a mitigation response to reconstitute the lost seagrasses if they have not recovered fully in that time. Avoiding disruption to existing mangrove communities was also critical to the Plan and no encroachment on existing mangroves occurs. 4.5.2.3 Design The cuts which are intended to relieve the constrictions in the main channels flowing to the North from Clam Pass are identified in this Plan as Cuts I, 2, and 3. For Cut 1, which is immediately south of Upper Clam Bay, a depth of-3 ft. NGVD and a maximum bottom width of 15 feet are proposed. Field adjustments to this proposed configuration will be made in those areas where the existing creek is too narrow to allow a full 15 ft. bottom width. In these areas, the actual width of cut will be reduced to prevent undercutting the mangroves. In addition, to minimize the volume of spoil, the excavated channels are to conform with the deepest part of the existing channels. For the two cuts in the tidal creek south of Inner Clam Bay (Cuts 2 and 3), a depth of-3 ft. NGVD is also proposed. This creek, however, carries greater flow volume than the northern creek and the maximum bottom width has, therefore, been increased to 20 feet. This will also facilitate improved tidal exchange. Sediment excavated from Cuts I, 2, and 3, as shown on Figure 4.5.2(h) and (k), is to be pumped to three areas lying between the dune line and the mangroves to the west. The spoil disposal sites will first be cleared of vegetation in preparation for receipt of fill. The sites have been chosen with a view to selecting those where the benefits of such removal is consistent with the overall goal of ecological enhancement and as such the sites are typically overgrown with exotics and other nuisance plants. A temporary containment dike will be constructed-on the eastern edge of the disposal site and buffered to the east by hay bales to retard backflow of spoil into the mangroves during pumping. The location of these disposal sites is shown on Figure 4.5.2 (k). ORPage 042680; 3F5P1 61 150 of 358 In order to increase the tidal prism and stability of Clam Pass, excavation of a more efficient flow channel is proposed between the inlet and Outer Clam Bay. This channel, which is referenced as Cut 4, consists of four segments which are shown on.Sheet 2 in Figure 4.5.2(l) and (I). The proposed depth for these segments.is -4 ft. NGVD. The widths vary. For Segment 4A, which is to terminate in Outer Clam Bay, a maximum bottom width of 30 feet is proposed. For the short segment 4B, which will carry flow .from the entrance channel to the northern-tidal creeks,-a.maximum bottom width of 20 feet is proposed. For Segment 4C, which will carry the entire tidal prism of the system, a maximum bottom width of 40 feet is proposed. Segment 4D has been included as a contingency, to be utilized only in the event that access from the Gulf of Mexico is required for dredge mobilization. If such access is not required then Section 4D will not be excavated. Cuts 4B, 4C, and 4D conform to the existing channels and these cuts will not result in any encroachment on existing mangroves or seagrasses. The existing channel in the vicinity of Cut 4A is not well defined and the proposed alignment has been selected to minimize encroachment on the existing seagrasses. This has resulted in a somewhat meandering channel but the changes in the alignment will not create any significant increase in the hydraulic resistance of the channel. It is estimated that Cut 4A will impact approximately 1/3 acre of seagrasses. This level of encroachment is necessary to achieve the objectives of the project. Spoil from excavation of Segments 4A 4B, 4C and 4D consists of varying mixtures of sand and organic fines. In Cuts 4C and 4D, most of the material is relatively clean sand. In Cut 4B, the material is primarily sand but enough fines are present to give it a light gray appearance. In Cut 4A,the material varies from a relatively clean sand at the north end to dark organic fines at the south end. To accommodate this variation in spoil quality and remain consistent with direction received from the FDEP, the organic fines excavated from the south end of Cut 4A will be discharged . to a spoil disposal site located behind the dune line adjacent to the entrance to Clam Bay. See Figure 4.5.2(o) • • 93SV1 51'of/3581 62 and(p). This area presently consist of predominately clean sand which will be excavated to a depth of- 1 foot NGVD to accommodate approximately 1500 to 2000 cubic yards of organic fines. Excavated beach sand from the spoil disposal site will be used for beach renourishment in part, but a portion will be stored on site for covering the fines upon completion of this portion of the excavation. Any native vegetation damaged or destroyed as a result of this excavation will be replaced with natural vegetation and natural regeneration will be encouraged. To assist in the control of turbidity during this portion of the excavation, the spoil disposition site will be diked and turbidity screens will be placed at the two points of connection into the main channel of Clam Pass. If additional disposal areas are required for the organic fines, then the PBSD in consultation with the FDEP and the Corps of Engineers will locate such additional areas in uplands behind the dune line to receive surplus fines applying the protocols for disposal of material from Cuts 1, 2, and 3 described in Section 4.5.2.3 above and shown in Figure 4.5.2(h) and (k). As an adjunct to the above analysis an examination of the condition of the offshore bottom was undertaken to determine the feasibility of various offshore disposal locations. This effort was undertaken in a study by Turrell & Associates, Inc. in July 1995 and is incorporated here by permission. This study concluded that "sand substrate containing a thin layer of silt dominates the Gulf floor offshore to approximately 200 feet." Seaward of the sandy bottom, hard bottom and vertical relief was observed. The initial indications of vertical relief contained scattered rocks with attached gorgonians (sea whips, sea fans), and various algae. One of the two areas with the highest vertical relief was located from approximately 50 feet north to approximately 50 feet south of the Inlet and approximately 250 to 300 feet offshore. This area is known to contain the highest diversity of algae, epifauna and vertebrates. The other area with high vertical relief is opposite the Florida Department of Natural OR042680;1/FP1 63 Page 152 of 358 Resources monument R-39, approximately 350 feet from the shore. It however is located considerably north of the area targeted for disposal of dredge fines. These hard bottom areas were located with the use of a bottom finder (KING 1350 • Model 1350A, 11-40voc). East-west transects were run using Department of Natural resources beach monuments R39 through R42 as reference points. Transects were run out to approximately 3000 feet offshore. A perpendicular.(north-south) set of transects were run on approximate increments of 300 feet (from east to west) to a distance of approximately 3000 feet offshore. Examination of bottom finder returns was used to locate any hard bottom throughout this area and once located, "bounce" dives were performed to observe conditions on the bottom. Documented organisms identified in the dives are listed on Figure 4.5.2(m)and the general conditions observed are as noted above. Figure 4.5.2(n) shows the hard bottom transects and Figure 4.5.2(o) shows the areas of vertical relief and hard bottom. While there are areas suitable for offshore disposal of organic fines southwest of R42 and across the hard bottom area approximately 3000 feet from the shore, it is proposed that this disposition be targeted for the spoil disposition site described above to avoid the possibility of exacerbating naturally occurring Red Tide blooms in the area by adding nutrients and organic materials into the marine environment. Once that excavation is completed, the discharge point will be relocated to a point on the beach approximately 200 feet south of Clam Pass and located between the mean high and low water lines. This location was selected because the net littoral transport in this area is from North to South. The dredge spoil from the northern reaches of Cut 4A and Cuts 4B, 4C and 4D, consisting primarily of sand, will nourish the beach down drift of the pass and will have the least potential for reintroduction into the Clam Bay system. Both disposition areas will require a variance from the requirements of Ch. 62- 4.244(5) Ha. Adm. Code to allow for an adequate mixing zone and some measure of relief from established turbidity requirements. The locations of both disposition areas are shown on Figure 4.5.2(o) and (p). o o4 in,ati ma 64 Figure 4.5.2(1) shows representative cut cross sections from the stations shown in Figures 4.5.2(h)(k) and (I). The dimensions of the proposed excavation cuts are as follows: Section Design Depth Bottom Width Length Volume (NGVD) (in cubic yards) 1 -3ft 15 ft 730ft 1140 2 -3ft 20 ft 550 ft 1680 3 -3ft 20 ft 630 ft 980 4A -4 ft 30 ft 2330 ft 15800 4B -4 ft 20 ft 200 ft 1300 4C -4 ft 40 ft 1070 ft 7700 4D -4 ft 40 ft 200 ft 1200 The estimated volumes given in the table above were obtained by calculating the differences between the existing cross sections and the design cross sections. These differences were then multiplied by the distances between the adjacent sections and the results were summed. A total of 63 cross sections were used for calculating the amount of excavation for Cuts 1 through 3 and 26 cross sections were used for estimating the channel excavations for Cuts 4A through 4D. 4.5.2.4 Construction The existing tidal creeks are too narrow and shallow for access by conventional dredge equipment. Moreover, upland access to the cut areas is not available for back hoes or upland excavation equipment. Existing conditions, therefore, restrict excavation to either a diver operated system or a small barge system such as a "Mud Cat". 0R042680;1/FP1 65 Page 154 of 358 For Cuts 4A, 4B, 4C and 4D, excavation is to be undertaken with floating equipment and spoil discharge is to be accomplished through use of a discharge pipeline. Access will be gained either from the boat ramp at the south end of Outer Clam Bay or through the Pass at the Gulf. Access through the Gulf is not anticipated, but, if utilized, it likely would require the dredge to cut its way through the inlet shoals to gain access to the excavation areas. The sequencing of the interior Cuts (1, 2, 3, 4A through 4 D) is not critical except for the need to complete the work associated with Cuts 4A through 4D outside of turtle nesting season. Accordingly, it is anticipated that the order of excavation will be left to the contractor's discretion, subject only to the necessity for meeting the preservation protocol's discussed earlier and the time constraint imposed by turtle nesting season. This excavation work in all sectors of the Plan is anticipated to be commenced as soon as practicable following approval of the Plan and will take, following mobilization on site, approximately 120 days to complete. There are no known constraints that would adversely affect commencement and completion of the work contemplated by this protocol once begun. Best management practices will be employed in order to insure that disruption to the existing ecology is minimized during the excavation process but as noted earlier, relief from the standard mixing zone protocol of 150 meters is required. 4.5.2.5 Monitoring and Maintenance These adjustments to the channels of Clam Bay are expected, when taken in concert with the other management protocols, to result in significantly improved tidal prism for the bays, improved transport of water and its constituents within the bay system and measurably improved flow rates through Clam Pass which will result in improved pass stability. The monitoring plans designed to quantify these response features are discussed in Section 4.5.6 below. o ge6fta 3581 66 Over the term of the Management Plan, PBSD will be entitled to maintain the Cuts identified herein to there design profiles, when and as often as they silt over during the term of the Management Plan. No further permitting from either the Corps nor the FDEP will be required to institute maintenance operations, but prior to initiating the same, the PBSD will provide written notice to both the Corps and the FDEP detailing the nature and extent of the required maintenance,the time for doing so and the proposed method for spoil disposal.. The Corps and FDEP will, upon receipt-of a request to perform ongoing maintenance on the Clam Bay system advise the PBSD of its approval or denial within forty-five (45) days of receipt of the request, specifying such additional conditions as either agency might reasonably impose. The initial request for maintenance shall include the information specified in Section 4.5.7.1 below. It is understood that PBSD shall not undertake any maintenance which requires access to the beach during turtle nesting season and no maintenance shall be undertaken until both the Corps and the FDEP have approved the same. The approval contemplated here will not involve a de novo review of the permit or permit conditions, but will focus on the nature and extent of the maintenance request initiated by the PBSD and the proposed benefit to be derived from the same. Maintenance that is consistent with the Plan and permit conditions shall be presumed authorized in the absence of a finding by either the Corps or the FDEP that a material detrimental impact to the ecology of Clam Bay is likely to or will occur if undertaken. 0R042680;1/FP1 67 Page 156 of 358 Page 157 of 358 4.5.3 Interior Tidal Creeks 4.5.3.1 Existing Conditions The existing interior tidal creek system of Clam Bay consists of three conditions distributed throughout Clam Bay. The three conditions are: (1) nonexistent, (2) restricted or blocked, and (3) restored. The nonexistent condition is the result of significantly reduced tidal exchange and reduced velocity of water within the interior tidal creek system over a protracted period of time. Historically, the tidal creeks were maintained in an open channel condition by three factors. The first is the scouring of the channel sides coupled with peak water velocities expected twice a month at peak flood and ebb tides. The second factor is a result of the abrasive characteristics of prop roots and cable roots as they grow and extend into the intertidal zone of the tidal channel. These two factors combine with a third, which is boring isopod damage. Two species of isopods are normally found in excavated chambers in the prop roots of red mangroves and occasionally in other root tissues and peat sediments. These organisms act as filter feeders and construct burrows as hydraulic conduits to accommodate their feeding methods. The totality of the process leads to a weakening of the prop roots and drop roots of the red mangroves, with the result being that they will break off at the water line giving rise to characteristic browse-line effect which can be observed in portions of Clam Bay. All of these factors have combined to retard the function of the tidal channels with the result being that they are beginning to silt in some places and in others the tidal channels no longer exist. This has resulted in the loss of natural channel maintenance processes with the consequence being that the interior tidal channels are in many areas of Clam Bay totally filled in (nonexistent) or on a track to be totally filled in absent some effort at restoration (restricted or blocked). The third condition is restored and evidence of the potential for restoration can be observed from the implementation of Corps Permit 93-si9oiME1 68 • No.199601979(LP-CC) and FDEP Permit No.112870025. See Figure 4.5.3(a). As Figure 4.5.3(a) suggests the preliminary results from the work undertaken pursuant to these permits indicates positive outcomes for improving tidal flows within the tidal creeks of Upper Clam Bay and therefore a positive contribution to the restoration component of the Management Plan. 4.5.3.2 Proposed Conditions - It is proposed that an additional 32963 linear feet of restored channels of four types be constructed in Phases in Clam Bay (Figures 4.5.3(b), © and (dl) and (d2). The four proposed types of restored channels are: • 1. Internal Main Channels being approximately 96"wide and 24"deep for a total distance within Clam Bay of 380 linear feet (Yellow). • 2. Internal Side Channels being approximately 36" wide and 12" to 18" deep for a total distance of 8318 linear feet (Light Blue). • 3. Internal Lateral Channels being 6" to 12" wide and 12" deep for a total distance of 11918 linear feet (Green). • 4. Internal swales being approximately 3"to 6"wide and 6'to 12" deep for a total distance of 12347 linear feet (Dark Blue). Additionally, yellow dots are used to reference areas where existing channels will be subjected to maintenance and refurbishment consistent with the existing profile of that particular channel, but only to the extent required when examined in the sequence of the implementation protocol. The maximum contemplated linear feet of maintenance excavation is approximately 16002 linear feet. If fully implemented these construction activities will generate a total of 2281 cubic yards of material. Since it is expected that this protocol will be undertaken sequentially and based on results achieved from early efforts, it is probable that the actual cubic yards 04i 69 of material to be disbursed will be significantly less. In any event, the material will be disposed of on site by careful placement in adjacent mangrove areas and in such a fashion so as not to create concentrated piles of spoil nor create blockages to existing and proposed drainage. In order to prioritize the applicability of each Internal Channel cut, the Clam Bay site has been systematically divided into.twelve_(12)_sub:.rnanagement.areas (Figures 4.5.3(b), (c), (dl) and (d2). Within each of these sub-management areas an examination of the existing conditions has allowed us to determine which of the identified channel cuts is most necessary within that sub-management area and which should be undertaken only as a contingent response to post restoration conditions. Examination of historical aerial photography (1940, 1960, 1973, 1984 and 1995) indicates areas where the closure of internal tidal channels has occurred. Evidence of probable positive impacts to the overall system from this activity can be observed from the opening of interior tidal channels in 1996 in Sub Management Area I. The restored channels have resulted in improved drainage within the isolated basins in this management Area and it is believed will, in time, contribute to the recovery of mangroves in this area, particularly if done in connection with the other restoration protocols set forth in this Management Plan. 4.5.3.3 Timing Attached as Figure 4.5.3(e) is a matrix setting forth the priorities(phases) and linear feet for channel excavation within Clam Bay. Phase One areas are those that are presently subject to waterlogging stress and are evidenced by dead or dying mangroves. These areas are in need of immediate repair and are located in Management Areas I and IV. In these areas there is a sense of urgency to accomplish remedial adjustments promptly in order to maximize the potential for improved drainage within this area of Clam Bay and to insure that even as the balance of the Management Plan is implemented, these areas will have improved tidal exchange and drainage capacities at the earliest possible time. ° °a`6i d-0 7 0 Phase Two areas are those where there are severely stressed mangroves, with some potential for expansion. See Figure 4.5.3(c). These are found in Sub Management Areas VI, VII, VIII and XII. These areas will be implemented as required after field examination of the results following completion of all other implementation protocols. This post development analysis will determine if inflow and outflow can be further enhanced by initiating this next level of excavation. Additionally, areas which were excavated in Phase One will.be_reconsidered for_supplemental_inclusion within Phase Two, if after a minimum of one year of post implementation monitoring of the Phase One restoration, the results suggest that Management Areas I and IV can be further enhanced by additional excavation. Phase Three areas are shown on Figures 4.5.3 (d1) and ( d2) and are those areas where the mangroves show no present signs of stress, but where historical evidence suggest that internal channels were present, but now are closed or severely restricted. They are located in Sub Management Areas II, III, V, IX, X and XI. As with the Phase Two adjustments, improvements to these areas will be undertaken only after an examination of the results of the Phase One and Phase Two restoration and only to the extent then on site evaluation justifies. It is anticipated that these areas will benefit from the totality of the work being undertaken by the other protocols and that designed levels of excavation within Sub Management areas labeled as Phase Two and Three will be required, but only minimally, provided that the totality of the restoration protocols set forth in this Management Plan are completed in a timely fashion. Chief among those are the improvements to Clam Pass and the inner bay channel improvements discussed under Section 4.5.2. gage teb gg1 71 4.5.3.4 Design Attached are Figures 4.5.3(f), (g) (h) and (I) depicting the location and size of each of the proposed interior channels as required in each Management Area. The exact location of each of the proposed interior channels shall be field located by a suitably trained and experienced individual who will mark the exact location of the channel to be excavated within the mangroves and consistent.with .the.priorities .described above. Written notice of the completion of the field marking of the channels to be excavated shall be provided to the Corps of Engineers and the FDEP prior to any excavation activity being commenced and the Corps and FDEP shall have a period of forty-five (45) days within which to inspect and approve or disapprove of the field located interior channel excavations. If the Corps and/or the FDEP shall not comment on the proposed field located interior channel excavations within the forty-five (45) day review period, then PBSD shall be authorized to proceed consistent with the construction protocols and monitoring requirements set forth in this Management Plan, otherwise the PBSD will work with the Corps and/or FDEP to resolve any outstanding and unresolved issues surrounding the proposed implementation of the excavation of the field located interior tidal channels. 4.5.3.5 Construction Actual construction of the previously-located and marked interior tidal excavation sites will be supervised by an environmental professional approved by the Corps and the FDEP. Construction protocols shall insure that collateral damage to existing mangroves and their understory is minimized and that Best Management Practices are employed in the implementation of the excavation required herein. It is anticipated that excavation will be accomplished by a combination of blasting and hand excavation. To the extent that ancillary permits are required for-blasting to take place, PBSD will acquire such authorization independent of this Management Plan. All excavation requiring blasting will be undertaken with deference to and outside of the sea turtle nesting season. 9 ge fYbigg1 72 Excavated materials will be disposed of onsite they will not adversely affect the topography of the site nor the existing and contemplated drainage on the site. Photographic evidence of both the pre and post construction activities- will be undertaken from locations approved by the Corps and the FDEP. Final as-built dimensions will be measured in the field, noted in a boundary survey with the approximate location recorded by a GPS reading. Actual survey dimensions will not be required. This work can is to.be undertaken as.soon as practicable following the approval of the Management Plan and continually processed to completion of Phase I. It is anticipated that Phase I can be completed within 120 days following field mobilization. 4.5.3.6 Post Construction Management and Maintenance Not later than thirty (30) days following completion of.any section of the excavated interior tidal creeks a reexamination of the same shall be made to remove and/or alter any debris or channel cut that may, on further review, adversely effect the operation of the excavation work. During the term of this Plan, the PBSD is authorized to maintain the excavated interior tidal creeks at their design elevation and width, provide that the maintenance initiation protocol described in Section 4.5.2.5 above is followed. 4.5.3.7 Post Construction Monitoring Monitoring of the work contemplated under this protocol shall be as described in Section 4.5.6 below. For work previously undertaken in connection with FDEP Permit No. 112870025 and US Army Corps Permit 199601979(LP-CC) it is anticipated that those monitoring protocols will be subsumed into this Management Plan and will therefore cease. OR042680' /FP1 73 • Page 163 01`358 Page 164 of 358 4.5.4 Stormwater/Freshwater Management 4.5.4.1. Existing Conditions The lands within Pelican Bay slope in an east to west direction beginning along a ridge line located roughly along U.S. 41 to the easterly fringe of Clam Bay. Elevations along 9 Y 9 Y 9 Y the ridge vary between 14 and 16 feet NGVD while elevations at the Clam Bay fringe are about elevation 1 foot NGVD. Accordingly, the slope across Pelican Bay is rapid, sloping at an average rate of 18 feet per mile. By contrast most of Collier County slopes from east to west at a rate of less than 1 foot per mile. Natural vegetation within the upland portions of Pelican Bay consists predominately of pine, palm, palmetto, turkey oak, wax myrtle, and rosemary. Much of this vegetation has been preserved within the landscape, but significant amounts of more tropical plant material has been incorporated into the landscape as a result of development. Historically, rainfall reaching the ground would either seep into Clam Bay via groundwater migration following the slope of the land or would be lost to the atmosphere via evapotranspiration. Under predevelopment conditions, much of the area's rainfall was held on the surface of the land in sloughs and other low areas. This water would then slowly filter through the soil to recharge the shallow aquifer or through the mangrove wetlands to the bay. The storage capabilities of the land thus moderated surface water outflows, preventing the occurrence of extremely high flow rates during the rainy season and serving to maintain surface flow and groundwater flow into the bay during the dry season. Present conditions of land development have modified the watershed's natural hydrologic response to rainfall as described below. As development of Pelican Bay commenced, a freshwater management system was designed and permitted under the regulations of the South Florida Water Management District (SFWMD) whereby a series of interconnected detention ponds and open water storage areas were built. These were designed primarily for flood protection for the OR042680;1/FP1 74 Page 165 of 358 residents of Pelican Bay, but they additionally provided water quality treatment and quantity attenuation sufficient to meet the State of Florida water quality and quantity standards. As developed the water management system is divided into six water sheds each labeled as a Drainage System. Each Drainage System is self-contained. Rainfall reaching the ground either seeps into the ground or runs off to a storm water detention pond or detention area within each Drainage System. Stormwater is detained within the detention ponds for flood control and water quality treatment. Stormwater discharge from the detention ponds is controlled by a series of weirs designed such that the post- development stormwater runoff rates do not exceed pre-development run-off rates. As a result, all stormwater discharges that are not lost to evapotranspiration or to ground water seepage are ultimately discharged down gradient through controlled detention ponds or areas with final outfall to Clam Bay. This flow is accomplished through a series of weirs located in the berm that separates Clam Bay from the developed portion of Pelican Bay. See Figure 3.2.2.1(b). The Pelican Bay water management system also accepts runoff from areas outside Pelican Bay. These areas are shown on Figure 3.2.2.1(b). There is a total of 130 acres of lands outside Pelican Bay which flow through the water management system. This represents approximately 7.9% of the total contributing area. Irrigation water for 27 holes of golf and landscaping in Pelican Bay supplements rainfall in the amount of 3.0 MGD or approximately 26 to 28 inches per year of additional rainfall equivalent. The source of this additional water is from the Pelican Bay Waste Water Treatment System (0.68 MGD),the Pelican Bay offsite well field (1.02 MGD) and Collier County's North Naples Wastewater Treatment Facility (1.43 MGD). This water, with the exception of the well water, is treated effluent which is stored and mixed with the well water prior to its utilization in the irrigation system. When added to the average rainfall for South Florida of approximately 53 inches per year, the Pelican Bay area has an effective annual rainfall approaching, 80 inches. When viewed in the context of predictable storm events that tend to distort the amount of average rainfall in any given time span, this additional amount of irrigation water is significant. This is particularly so, omg ns:0 W 75 when you consider that the 3.0 MGD (an average) "rainfall equivalent" is a daily event for Pelican Bay and therefore Clam Bay and occurs irrespective of and independent from the normal wet-dry season. • Importantly, more that 41 inches, or 80% of the rainfall, occurs during the rainy season (Simpson et. al. 1979). Much of the summer rainfall occurs in the form of thunderstorms, and is typically of high intensity and short duration. However, prolonged periods of rainfall sometimes result from continued inland air flow from the Gulf of Mexico. Hurricanes and less severe tropical depressions are at times major sources of precipitation, especially in late summer. During the winter and early spring the weather is generally clear although the sporadic passage of frontal systems during the winter can result in widespread, light to moderate rains lasting up to two to three days. (EPA 1973). It seems clear that the daily irrigation water volume enhances the saturation of the developed portion of the Pelican Bay uplands which in turn, reduces their ability to accommodate rainfall volume, thus effectively increasing surface and groundwater discharge. This results in noticeable groundwater discharge along the eastern side of Clam Bay. It is observable as a very slight sheet flow and evidences the significance of the altered capacity of the restructured uplands to accommodate the freshwater inputs as it did predevelopment. 4.5.4.2. Proposed Conditions Modifications to the freshwater/stormwater management system are constrained by the need to find solutions that meet the test of being cost effective, logistically achievable, and technologically feasible. The goal is best described as getting the right amount of water through irrigation in the right place at the right time and in the right amount. At present, the PBSD does not know what amount of water is necessary to augment rainfall in order to sustain the vegetation palette that characterizes Pelican Bay, nor does the PBSD know what modifications to that palette might be appropriate over both the short and long term to augment adjustments in water consumption. As OR042680;1/FP1 7 6 Page 167 of 358 a general proposition the PBSD accepts the notion that native vegetation utilizes less water than does non-native vegetation and that the practice of dispersing water through irrigation without regard to rainfall, evapotranspiration rates and vegetation requirements is in need of further study. However, accepting the notion that adjustments are feasible and having the power to enforce the same are not the same thing. Within the Pelican Bay community there are a variety of ownership structures which compromise the ability of the PBSD to enforce community wide standards for moderating freshwater usage. This reality must be considered in developing any plan for adjustment to freshwater usage. For example, the golf course which consumes on an average day something in the neighborhood of 500,000 GPD is owned and operated by a separate legal entity. It does obtain its water through the auspices of the PBSD, but the PBSD does not have the legal authority to compel a moderation in that use. In like manner, the various individual homes, condominium associations, commercial and retail properties are all owned and operated under various associations with divergent and various interests impacting their willingness to be a participant in any effort to ameliorate water usage within Pelican Bay. The PBSD has direct responsibility for irrigating only about 68 to 70 acres of the common area within Pelican Bay, leaving the remainder of the acreage including the golf course or approximately 630 acres, to be managed by various individual homeowners, associations of homeowners . Accordingly, the Management Plan recognizes the necessity for bringing together these potentially disparate interests and attempting to create a framework which will allow them to work together toward a common goal of developing a series of revised management protocols for limiting the need and demand for freshwater. To accomplish this objective, the Management Plan contemplates a series of studies designed to determine the best and most cost effective way to better manage freshwater inputs to the Pelican Bay watershed and to that end will describe a set of targets for OR042680;1/FP1 77 Page 168 of 358 reporting back on the outcome of various studies and establish various timetables for implementing the results of the same. 4.5.4.2(a) Study Number 1. Stormwater Detention Volume and Water Budget Analysis This study has been undertaken and its results are incorporated here by reference. The firm of Wilson, Miller, Barton & Peek concluded in a study undertaken in April 1996. entitled "Pelican Bay Waster Management System - Stormwater Detention Volume and Water Budget Analysis"that modification of the existing stormwater detention ponds in order to enlarge there storage capacity was not practicable, given both the constraints of existing development and the de minimis benefit to be achieved. Their analysis demonstrated that only 27 acre feet of additional storage capacity was available and that this represented only 0.7% of the total yearly volume of surface water flow into Clam Bay. (The latter estimated to be 3807 acre feet). It is worth noting that in four of the six Drainage Systems within the developed portions of Pelican Bay, the stormwater detention ponds are currently storing 7% more stormwater runoff than the permitted storage volume, lending further validity to the conclusion articulated in the study. 4.5.4.2(b) Study Number 2. Vegetation Analysis/Irrigation Requirements In order to determine the amount of water necessary from irrigation to sustain the landscape palette within the common areas and golf course of Pelican Bay it is first necessary to determine how much water is required and when, in relationship to the existing landscape. Accordingly, a first study will involve an analysis of the vegetation presently being irrigated by the PBSD and The Club Pelican Bay (golf course), its location within the community and its requirements for water in the ordinary course. This is, at its most basic, a study of the existing irrigation system utilized by the PBSD and The Club Pelican Bay, including a mapping of the existing vegetation which is subjected to PBSD and golf course maintenance. OR042680;1/FP1 7 8 Page 169 of 358 • This study will involve the taking of soil samples in various locations to be determined in order to ascertain the moisture level and rooting depths of the vegetation in the various locations. During this review, the technician's will also take water measurements from the irrigation system to determine the timing and volume of water that is being disbursed during each irrigation cycle. Comparisons will be made between actual water being used in the irrigation system presently and water that should be used for the same vegetation palette in the same location if the system were operating at peak efficiency. As an adjunct of Study Number 2, additional data will be collected to determine the chemical content of the irrigation water and the fertilizers, herbicides and pesticides being used within the areas managed by both the PBSD and The Club Pelican Bay. As with freshwater, the application of these chemical constituents to the vegetation and in particular to the turf grasses administered by both groups is significant to improved water quality. The same test applies:the right place at the right time in the right amount. With regard to the other key areas within the Pelican Bay community, the PBSD will convene a panel of representatives from the various homeowner associations and commercial interests with a view to conducting the same kind of analysis and to encourage the same kind of response. In that context, this group will be encouraged to adopt the Pelican Bay Yards and Neighborhood Program as the same might be modified after further review and input from a consortium of these persons. The PBSD will act as the coordinator and facilitator of these meetings, providing both technical support and data to assist the resident base in reaching the decision that the reduction of freshwater usage is necessary for the future ecological health of not only Clam Bay, but of the community as a whole. Accordingly, this study is divided into two parts. The first relates to a joint undertaking by the PBSD and The Club Pelican Bay to determine the matters referenced above and to develop a response to the same. Organization and implementation of the study protocols are to be devised and implemented within six (6) months following adoption OR042680;1/FP1 7 9 Page 170 of 358 of the Management Plan. The study will be completed not later than one year following commencement of the same and the implementation protocols emanating from the study will be phased in over the life of the Management Plan, but to be completed no later than the year 2003. Targeted areas of specific inquiry and areas where there is thought to be potential for improvement involve upgrading of the irrigation system so that it calibrates both evapotranspiration and rainfall.inputs as needed at any given location. This analysis also assumes the probable necessity for some adjustment in the quantity and location of sprinkler heads so that the placement of water corresponds with the areas where water is needed. Intuitively, PBSD suspects that the results of the study will demonstrate the following; first, that the system as presently operated is inefficient and tends to put too much water in some places and too little in other places; second, that the system by reason of excessive watering in some areas tends to create pockets of severe leaching into the ground water of fertilizers and pesticides; third, that the imposition of Best Management Practices in the utilization of the existing irrigation system would result in a more uniform and correct disbursal of water thereby avoiding over watering; fourth, that opportunities Wile identified for the modification of the landscape palette over time that will allow a measured adjustment to the same, but with significant reduction in the amount of water required to sustain the vegetation over time; and fifth, that the irrigation system itself requires some modification and upgrading to insure that it operates with maximum efficiency. To facilitate the development of this Study, the PBSD will consult with appropriate experts, including, but not limited to the USDA Natural Resources Conservation Service to design the study protocols and define within the context of the broad goals articulated here the precise goals and methodologies required to accomplish the Study. The second part of the inquiry will involve an examination of the potential to retrofit the landscape palette of the common areas and golf courses with vegetation that demands less irrigation than is presently the case. PBSD will undertake this analysis in an effort 0R042680;1/FP1 8 0 Page 171 of 358 to identify areas within the community controlled and managed by it and The Club Pelican Bay to determine what, if any, adjustments might be planned for implemented over time. The out growth of this study will be to develop a long range plan that targets areas of opportunity for replanting at various times over time. The goal is to reduce the amount of acreage subjected to irrigation by introducing plant material that requires less irrigation to support it in this environment. In like manner, the PBSD will encourage individual homeowners and associations of homeowners to follow suit, providing them with the technical expertise and support necessary to assist them in making the transition to this planting palette over time. The revised palette will be published and as and to the extent that the PBSD can enforce the same as a requirement of planting new vegetation within the community, it will do so, otherwise, it shall serve as guide to the resident base. 4.5.4.2(c) Study Number 3. Retarding Freshwater Flows into Clam Bay As an adjunct to the Study No. 2, it is also important to understand where water can be eliminated from the irrigation component. PBSD believes that the analysis being done under Study No. 2 will demonstrate that the application of Best Management Practices to the irrigation of the golf course and common areas of Pelican Bay will result in a diminished need for importing water for irrigation. In anticipation of that outcome, the PBSD will initiate dialogue with Collier County to explore alternatives available over a three to five year period for reducing the quantity of treated effluent provided to the PBSD from Collier County, thereby reducing the amount of freshwater being applied through the irrigation system. 4.5.4.2.(d) Study Number 4. Reducing Flow from Perimeter Berm Area to Clam Bay PBSD believes that there exists a present opportunity to reduce flows into Clam Bay and that can be accomplished by reducing back the discharge into Clam Bay by reducing the size of the water control structures and the related discharge pipes that presently Tage226f 0'1 81 facilitate the transport of water from the developed section of Pelican Bay to Clam Bay. An analysis will be undertaken to determine the cost/benefit of undertaking this adjustment in the water management system. The study protocols will be designed and completed within 180 days following adoption of the Management Plan, with implementation of the same to follow as soon as practicable. If, as anticipated, it is determined that this adjustment will have a positive effect on both the water management system and contribute to limiting the flow of freshwater into the Clam Bay ecosystem, then the appropriate permits from the South Florida Water Management District will be processed and once obtained, promptly implemented. In this regard, it should be understood that the time table for processing these permit adjustments from filing to completion will be in the neighborhood of eight to nine months. Accordingly, this process will take approximately 14 to 16 months to complete. 4.5.4.2.(e) Study Number 5. Groundwater Flows PBSD believes that the combination of rainfall and irrigation, taken together with the design characteristics of the water management system as a whole, contributes to increased ground water flow into Clam Bay. To determine the present condition of that groundwater flow and in particular the discharge rate of ground water so that the relative contribution of ground water vs surface water can be calculated, PBSD will design and initiate a groundwater monitoring program to determine these flow characteristics. The protocols for the monitoring plan will be developed within 180 days of adoption of the Management Plan and once developed will be implemented as soon as reasonably practicable. It is anticipated that the data collection effort under this test will continue for a minimum of one (1) year or through one complete hydrological cycle. 4.5.4.2(f) Study Number 6. Utilization of Stormwater Management Lakes as Source for Irrigation An additional method of reducing both the inflow of water for irrigation and contributing to a more effective utilization of existing water resources, PBSD will analyze the • OR042680;1/FP1 82 - Page 173 of 358 feasibility of using the stormwater management lakes as primary source for accessing water for irrigation. At present, PBSD anticipates that this source may well be feasible particularly during the wet season when the lakes are typically filled to capacity. It is thought to be less likely that these facilities will be available in the dry season. Accordingly, this study is projected to develop a recommendation that the stormwater lakes be used as a part of a series of adjustments, all designed to reduce both the need for freshwater irrigation and to better manage the freshwater irrigation that has been and will continue to be a part of the maintenance mix at Pelican Bay. 4.5.4.3 Conclusion The results of the referenced studies are expected to allow the PBSD to develop a variety of additional initiatives to both manage fresh water utilization within the community and, importantly, to reduce the amount of freshwater utilized for irrigation in the community. All studies identified above must be initiated and completed within three (3)years following permitting of the Management Plan. At the completion of all studies, PBSD will prepare a comprehensive report to be submitted to the Corps and the FDEP which report shall (1)detail the results of the studies (2) articulate the conclusions which the studies suggest for modulating freshwater utilization within the Pelican Bay development and (3) set forth a plan for implementing the freshwater/stormwater management adjustments, including time lines for commencement and completion of the proposed activities. None of the proposed activities identified in the report referenced here will be commenced until the Corps and the FDEP have approved the same following submission to the agencies as above described. Nothing contained herein shall preclude the Corps and/or FDEP from requesting further and additional data or information in the event that the report prepared pursuant to this Section is deemed incomplete in any material way. OR042680;1/FP1 83 Page 174 of 358 Page 175 of 358 Page 176 of 358 4.5.5 Ecosystem Enhancements 4.5.5.1 Integration and Modification of Existing Permits Historically, both Collier County and the PBSD have either individually or collectively pursued and obtained a variety of permits designed to adjust one or more conditions within Clam Bay. To varying degrees these permits have been obtained and implemented by the permittee. Each of these permits contains various monitoring and performance criteria for certain portions of the Clam Bay system. This restoration and management plan contains additional monitoring requirements that may overlap with those permits already issued. The plan proposes to remove any monitoring conflicts or redundancies and produce a more complete and consolidated data set for analysis and evaluation of the restoration progress of the entire Clam Bay system. The plan will amend and/or modify the below referenced permits monitoring and reporting criteria. To that end, each of the referenced permits shall, by the permitting of this Management Plan, be incorporated by reference and modified as described in this Management Plan. Reference should be had to Section 4.5.6 below for amended and restated monitoring criteria. Permits issued for specific activities in Clam Bay include the following: Permit Number Permit Name Date Issued DEP Permit No. CO-578 Portable Pumps and Pipe %197 DEP Permit No. 11-2870025 Wetland Enhancement 5/1/96 DEP Permit No. 11-2859039 Clam Pass Dredging 4/2/96 Modification 4/10/96 ACOE Permit No. 199602789 Portable Pumps and Pipes 1/28/97 ACOE Permit No. 199501979 Flushing Cuts 6/26/96 Modification 8/9/96 Modification 10/31/96 ACOE Permit No. 199500127 Clam Pass Dredging 4/2/96 oR1440407b48 84 (a) Clam Pass Dredging. These permits allowed for the emergency maintenance dredging of Clam Pass which as previously noted has closed several times over the past few years. Because of the frequency of pass closure, an agreement was made a part of the Corps permit that a long term management plan for the Clam Bay ecosystem would be prepared and submitted prior to consideration of any additional dredging applications. The Corps has demonstrated flexibility in the application of that condition precedent by favorably reviewing and permitting an extension of the same to allow for additional excavation in calendar year 1997. However, that Inlet Management Plan prepared and submitted by Collier County has received Corps comment suggesting that the same should be reviewed in concert with this Management Plan. If this Management Plan is permitted as applied for, then the long-term maintenance dredging, to the extent required, will be administered according to this Management Plan. (b) Tidal Creeks These permits allow for the reopening of three historic main creek channels and several side channels to provide drainage of the surrounding black mangrove forest basin. Over the years, these creeks have silted in and mangrove roots and pneumatophores have choked the natural flow ways. Both the Corps and the FDEP permits applicable to this remediation effort were issued for five years, expiring in 2001. As permitted, monitoring includes: recording water level elevations through staff gauges and/or groundwater monitoring wells; recording salinity;sampling and analysis of eight vegetative plots;fixed point photography and completion of a baseline monitoring report. Subsequent monitoring reports are to be submitted on a semi-annual basis for a period of three years. Additional tidal creek improvements are proposed as a part of this Management Plan. Therefore, the adoption of this Management Plan is intended to and would supersede and replace the monitoring criteria specified in the referenced permits to the end that O12042680;1/FP1 85 Page 178 of 358 one comprehensive set of monitoring data may be obtained and evaluated for the entire Clam Bay system. (c) Portable Pumps and Pipes These permits allow for the installation and temporary use of two portable pumps and pipes to discharge water from Clam Bay when it reaches an elevation determined to result in highwater conditions that could negatively impact black mangroves. The FDEP permit was listed for one year and the Corps permit was issued for five years, expiring 2002. It is the inteattithis Management Plan, if permitted, to utilize the north portable pump and pipe toarge water only at peak elevations and during severe storm events that are likely to>awhelm the system to the detriment of the mangrove forest. The north pump and*system would discharge water from the stormwater management system prior to entriiiro Upper Clam Bay. The south portable pump and pipe is designed to discharge islisfrom Inner Clam Bay when that area reaches peak elevations. The use ofrortable pumps and pipes will be evaluated as the Management Plan progresses.( €:anticipated that the need for these improvements will be eliminated as the remai f the restoration initiative contemplated by the Management Plan is implemerdet In that basis, the portable pumps and pipes are intended as a long term contingeTonse to be utilized only in the most demanding of circumstances. No tong ical or water quality monitoring was required by permit condition for these aciwgesatanone are proposed beyond the comprehensive set of protocols set forth in ;6 below. OR042680;1/FP1 8 6 Page 179 of 358 4.5.5.2 Withdrawal of Permit Application for Clam Bay Overflow Structure Consistent with the provision of Section 4.5.5.1 above, upon the adoption of this Management Plan, the Collier County Pelican Bay Services Division withdraws its Joint Application for Coastal Permit, Authorization to Use Sovereign Submerged Lands and Federal Dredge and Fill Permit Application entitled Clam Bay Overflow Structures filed with the Army Corps of Engineers and the Florida Department of Environmental Protection on or about April 11, 1996. 4.5.5.3 Evolution of Clam Pass Tidal-Channel Network Within the vicinity of Clam Pass is a network of tidal channels and sediment shoals of various ages and levels of evolution. Like the channels, the shoals are not permanent landscape features but instead are dynamic units that are being contiguously formed, reshaped, and eventually destroyed by normal tidal action and periodic storms. Typically, during a major storm, the sandy sediments in the channels and forming the shoals are "blown out"through inlets in the Gulf. It is following such storm events that Clam Pass and the inner tidal channels are at their deepest. Then during subsequent no-storm years, beach sand moving along the littoral beach front gets "pumped" in by tidal action through the pass and into the inner network of channels where it accumulates. Over time the channels fill in with sand and shallow shoals are formed The present situation reflects a relatively long interval since the last"blow out" and an almost continuous corresponding period of sand accumulation. It for this reason that it has been necessary in the past to dredge the pass to increase its cross section and depth for tidal exchange. Those recent dredging actions did not materially affect the sediment accumulations in the inner tidal channels with the result being the formation of three major shoal systems of differing ages and stages of evolution. At the present time there is a continuing net accumulation of sand within Clam Pass and the interior tidal channel network as a result of tidal pumping. If this sand is not • removed, accumulation will continue concomitant with a decreasing flow cross section OR0680;1/FP1 8 f Page 180 of 358 and a corresponding reduction in tidal exchange - at least until the next major storm event that either reopens Clam Pass (in its present location) or opens a new pass (as in the past). This decreasing tidal exchange will further contribute to the deterioration of the interior mangrove forest, and, significantly reduce the probability of natural or assisted recovery of native vegetation. Accordingly, the no corrective dredging option has been rejected and the dredging plan is more comprehensively analyzed in Section 4.5.2 above. The determination to excavate both Clam Pass and the support channels running to Outer Clam Bay gives rise to a concomitant need to dispose of the spoil generated by such activity in a fashion that is not only respectful of the natural environment presently in place, but that will, if implemented properly, enhance ecological diversity and productivity within the Clam Bay ecosystem. Additionally, the need to dispose of spoil requires that it be done consistent with existing technology, and that the process for • disposal be both logistically feasible and cost effective. It is out of these concems,that the spoil disposal plan described above emerged. 4.5.5.4 Dead Mangrove Removal and Landscape Restoration For aesthetic reasons and to facilitate restoration, the majority of the standing dead trees along the coastal development road should be removed. Removal can be accomplished with chain saws to cut the trees trunks at close to ground level and to buck (cut) the trunks and limbs into small pieces (18 to 24 inches). All of the bucked slash (cut wood) should be placed in contact with the sediment to facilitate natural decomposition -wood not in contact with the sediment will only decompose very slowly. A number of the tallest trees should be left standing to serve as perches for birds. By leaving the bucked slash onsite to naturally decompose eliminates the significant problem caused the physical removal of the trees which would necessary result in extensive sediment disturbance and compaction. OR042680;1/FP1 8 8 Page 181 of 358 In terms of tree removal intensity, all standing dead trees should be removed from within about 20 feet of the Strand road, together with 50 percent of the remaining dead trees in the area. From the road, the foreground would be totally cleared of dead trees whereas dead trees would remain in the background but these tend to visually blend in with the living forest backdrop. To accelerate restoration at minimal cost, mangrove starter islands should be established at random suitable locations throughout the area of mortality. Mangrove starter islands are irregular circles or polygons approximately 3 yards in diameter within which the substrate has been tilled and subsequently planted with a high density of older reproductively-mature (2 to 4 feet tall) potted or root-balled mangroves of several species. The substrate is prepared by tilling (literally turning over the soil with a spade to loosen it to a depth of 1.0 to 1.5 feet) to improve substrate aeration. The planting holes are then excavated, partially filled with mulch and slow-leach fertilizer and the plants planted. When the island has been planted the substrate surface is then covered with surface litter (leaves, twigs, debris)from a nearby natural forest area. The started islands are then fertilized every three months for one year. Starter islands serve several important purposes. First, they are aesthetically pleasing and provide "instant" visual landscape diversity. Second, they serve as a local propagule or seed source which results over time in a lateral expansion of the island. Finally, they serve as a microhabitat and refugia for resident and transitory arboreal and cryptic fauna. Also, from a more practical view, starter islands are a reasonable substitute for the uniform planting of large areas with small plants. With specific regard to the barren areas around Clam Bay, they are far removed from existing seed sources such that only the relatively small seeds of the white mangrove are capable or being transported to those areas. Thus, having starter islands with the other mangrove species would create a viable opportunity for local regeneration. The only issue concerning the location of the islands is that each should be linked, minimally with a ditch, to a nearby surface water. OR042680;1/FP1 8 9 Page 182 of 358 4.5.5.5 Cattails In the more northern reaches of the Clam Bay system where salinities are extremely low, there are viable populations of cattails. Although not desirable, this type of aquatic vegetation is notoriously difficult to remove. However, in the context the broad plans to restore the hydrology of the system, it is likely that the planned increase in surface water salinity will serve as a control on cattails which are salt intolerant.Accordingly, over time the cattail population will be subjected to salt stress and eventually decline, and therefore no overt cattail eradication measure is proposed as a part of this Management Plan. 9 i89 4881 9 0 Page 184 of 358 4.5.6 Monitoring The monitoring is designed to not only continue the development of the base line data that gives rise to these recommendations, but to develop additional data that will suggest alternative management options and evaluate the success of the management protocols that have been implemented. Five areas have been selected for periodic monitoring. They are as follows:. . • Salinity Monitoring • Biological Monitoring • Sediment/Water Quality Monitoring • Hydrologic Monitoring • Seagate Culverts Flow Monitoring These five areas represent important indicators of the overall well being of the Clam Bay system and each is discussed below. 4.5.6.1 Salinity Monitoring The inflow of both freshwater and saltwater Clam Bay is of primary importance to the biological communities and the overall health of the Clam Bay ecosystem. An important component of the Management Plan is to evaluate any changes to fresh and saltwater inflow into the Clam Bay as a result of implementing the Management Plan. A salinity data set will be developed for Clam Bay to evaluate the impact of selected management options on changes in salinity. The management options to be evaluated consist of maintenance dredging and expansion of existing channels at Clam Pass and the interior tidal creeks and how those impact on the distribution of salt and freshwater in Clam Bay. • To better refine the salinity data set for future use and to obtain a better understanding of the fresh and saltwater distribution in the Clam Bay six (6) continuous salinity OR 61 5;af/da& 91 monitoring units are recommended. These monitoring units would provide information on, not only short-term, but long-term changes in the bay as well. The six locations for the salinity monitoring units are to be located as follows: one at the southern and northern end of Outer Clam Bay, one in the vicinity of Clam Pass, one at the northern and southern end of Inner Clam Bay and the sixth at the northern end of Upper Clam Bay. Salinity monitoring is an ongoing activity of the PBSD at three of the six locations with a fourth being managed by the.Collier County-Natural Resources Department. This management protocol contemplates the continuation of these data gathering activities following implementation of the Management Plan and the addition of two more monitoring stations. The salinity monitoring protocol contemplates quarterly analysis over a period of one week. The Clam Pass station would provide information on saltwater inflow while the Upper Clam Bay units would provide information on salinity distribution in this portion of the bay. The Inner Clam Bay stations would provide an interim calculation to monitor consistency and/or deviations as seawater moves north through the system. The Outer Clam Bay station would provide insight into the effectiveness of both the enhanced tidal prism and the Seagate Culverts retrofit on salinity within the southern reaches of the system. (See Figure 3.2.3.1(a)) The recommended equipment for this monitoring function is a Micro CAT SBE - 37-SM with serial interface and memory. It will record over 100000 data points for salinity, temperature and time over intervals ranging from 14 days to over two years (10 minute sampling intervals). The desired sampling interval will be field determined. Once programmed and deployed, data can be down loaded with a lap top computer. This information would assist in further evaluation of salinity patterns and future modeling activities. This management option would be coordinated with PBSD's ongoing water quality monitoring program. olim r0;qf i 92 4.5.6.2 Biological Monitoring To determine the long-term status of the biological condition of Clam Bay, it is recommended that several parameters be monitored on an bi-annual basis. These parameters would include the distribution of: • . .. Seagrasses; .. . .. .. . . . . _.. _ . _ - ._..... ... . • Wetland plant types including mangroves; • Exotic plant species; and • Selected wildlife. Seagrass distribution, abundance, and species richness appears to be tied to the dynamic behavior of the shoals, salinity, and light within the area from Clam Pass to the south and into Outer Clam Bay. It is recommended that a continuing survey program be implemented on an annual basis. The need for this work is apparent given changes in grass bed location and size proposed in this Management Plan. The kind of seagrass growing in each sub-area also reveals long term salinity and light conditions and when coupled with the salinity monitoring results will serve as a check on those reports. Wetland types and distribution as well as mangrove types and distribution need to be monitored closely. The system is large and difficult to access, but aerial photography can be interpreted with meaning and on ground verification of the aerial photography can be undertaken selectively and with precision. The specifics of this task are linked to the modifications to the interior tidal creeks and the monitoring protocols are defined there. Another related need is the monitoring of exotic plant species encroachment into the spoil disposal sites within Clam Bay. Attention will be given to exotic infestation within these communities and to the extent encountered, appropriate steps will betaken to insure that the percent of cover is kept at or below 1% of the surface area of any one spoil disposal site. OR042680;1/FP1 93 Page 187 of 358 4.5.6.3 Sediment/Water Quality Monitoring. To determine the present and prospective quality of the sediments in the stormwater runoff, and in particular the character of the nutrient loading resulting from the same will require that the program of sampling and monitoring of various water components as is presently being performed by the PBSD and Collier County be continued and consolidated under the Management Plan exceptas otherwise.described herein. • In this context there are four locations located along the eastern berm that separates the mangrove estuary from the developed areas of Pelican Bay, as well as, three sampling stations located in the Clam Bay area itself. The latter three are located in Outer Clam Bay, inside Clam Pass at the point where the channel cut takes the main portion of the tidal exchange to the north and at the northern terminus of Inner Clam Bay. A fourth station will be added in Upper Clam Bay. Except for the addition of salinity monitoring, the protocols tested for at each of these stations will remain as presently conducted by the PBSD. Accordingly, at the four units located within the bays, PBSD will test for salinity, Silicate, Nitrites, total Organic Carbon, Chlorophyll, Phaeophytin, temperature, pH, conductivity, dissolved Oxygen, total Phosphorous, Nitrate, Nitrate Ammonia, total Kjeldahl Nitrogen, and total dissolved solids. At the monitoring stations located along the interior berm at the eastern edge of Clam Bay, the monitoring will include each of the parameters from temperature through dissolved solids listed above. See Figure 3.2.3.3.(a)) for the location of these monitoring stations. It is anticipated that this program will be conducted on a quarterly basis during the life of the Plan with reports to be submitted semi-annually. OR04Pag26 ;1/ 94 e 18088 of 358 FP1 • 4.5.6.4 Hydrologic Monitoring. In order to ascertain the workings and effectiveness of the improved tidal amplitude contemplated by the remedial action recommended by this report a program of hydrologic monitoring will be implemented. The movement of tidal water will be catalogued as will water levels at various times over the life of the project This monitoring-will -include analysis-of tide measurements,-rainfall, and groundwater accessing the system in order to better understand over time both the amplitude and duration of the flood and ebb tides behavior within various parts of the geography of Clam Bay. The plan contemplates three (3) recording tide gauges that will operate continuously. They are located at Clam Pass, Outer Clam Bay and Inner Clam Bay. Additionally, Tide Staves will be field located within Clam Bay to augment the automated tide gauge readings. Locations of tide gauges and staves are shown on Figure 3.2.3.1(a). Bathymetry readings at ten (10) locations to be field located will complete the hydrologic monitoring protocol. 4.5.6.5 Seagate Culverts Flow Monitoring. In orde r o understand the working orking ch ara ct en characteristics o f the Seagate Culverts s a s modified, , the flow velocity of the culverts both pre and post modification will be monitored by use of a flowmeter. Flow will be measured at least once every hour at the low tide and ending at the high tide of Venetian Say. Time, direction and flow velocity are to be measured and from that approximate quantities of water through the culverts is to be computed. [See Sections 4.5.1] 0R0426B0;1/FP1 95 Page 189 of 358 • Page 190 of 358 4.5.7 Contingency Planning The research and analysis which supports this Management Plan indicates that the increased tidal exchange and the long term modifications of freshwater inputs into Clam Bay will rectify the conditions responsible for recent mangrove die-off and restore the bays to a more productive condition. It would, however, be unreasonable to believe that all future responses of a system as complex.asthe.Clam Bay_system could be precisely predicted. Moreover, it is expected that, once the system has adjusted to the proposed changes, areas for further improvement will become apparent. To maintain operational flexibility, the Management Plan includes provisions for future contingencies. This approach is both desirable and consistent with the overall intent of the Plan; to create operational flexibility in the long term management of Clam Bay. Accordingly, four areas of contingency planning have been identified and are discussed here. 4.5.7.1 Clam Pass/ Main Channel After the completion of the initial restoration of the primary flow channels within the Clam Bay system, the system performance will be maintained as previously discussed. If it is found that maintenance activities are required or that further improvements could be realized by work of a character similar to that authorized in the initial restoration, such work will be considered to fall within the provisions of the Contingency Plan. Before undertaking such Contingency Work, PBSD shall submit to the permitting agencies the following data (1) plan and cross-section views of the areas proposed for maintenance, (2) calculations of excavation quantities, (3) the timing of the maintenance excavation including the duration of the proposed activity and (4) such other matters as the • permitting agencies might reasonably require. It is recognized that PBSD must obtain the prior approval of the permitting agencies for the implementation of Contingency Work in the Pass and the main channel. Notwithstanding such requirement, it is not °Roam af/4481 9 6 intended that the process of approval for Contingency Work in the Pass and/or the main channel will rise to the level of a full Permit review, it being understood that Contingency Work within the system described in the Plan is a permitted activity, provided that such Contingency Work is consistent with and does not exceed the design and implementation criteria specified in FDEP Permit No. 0128463-001-JC. 4.5.7.2 Interior Tidal Creeks - - The excavation of the interior tidal creeks described in Section 4.5.3 above contains the operative contingency protocol. Sub Management Areas I and IV will be restored as a first response with work in the other Sub Management Areas to be undertaken, if at all, only to the extent required to achieve the then determined field improvements. After the work in Sub Management Areas I and IV has been completed together with the work at Clam Pass and the main entry channels, then an evaluation of the results of the same will be undertaken in the field and recommendations made with regard to, whether or not and to what extent, additional work on the interior tidal creek system is needed. If it is determined that additional work is desirable, the PBSD will file a report with the Corps and FDEP advising them of the findings and detailing the proposed scope, location and rationale for the additional excavation. The Corps and FDEP may, at their option, comment on the proposed work, but absent a finding of material and substantial change that impairs the ecological integrity of Clam Bay or that the proposed work exceeds the contemplated scope of excavation as detailed in Section 4.5.3 above or that the proposed work will, based upon a new finding or more current data compromise the ecological health of the Clam Bay system, the PBSD is authorized to implement the additional excavation. All additional excavation undertaken pursuant to this Section shall be in conformity with the excavation protocols set forth in Section 4.5.3 above. OR042680;1/FP1 9 7 Page 192 of 358 4.5.7.3 Seagate Culverts The installation of the flow control structures to the Seagate Culverts is expected to contribute to an increase in the tidal prism in Outer Clam Bay. It is not expected to have any detrimental effect on the operational characteristics of Doctors Pass or the Moorings Bay system. Therefore, as and to the extent any post installation review of the operational characteristics of the Seagate Culverts reveals any level of disintermediation in the operation of the Moorings Bay System or of Doctors Pass, a reevaluation of the Seagate Culverts will be undertaken and such adjustments as are suggested by the evidence will be evaluated and, if appropriate, made in the operation of the Seagate Culvert system. This may include, among other modifications, the reestablishing of the oscillating flow characteristics that preceded the installation of the control valves. As and to the extent that the post installation data suggest a return to the pre modification condition, this modification will require the concurrent consent of the Corps and the FDEP before implementation. The PBSD will submit to the Corps and the FDEP such data as is reasonably necessary to evaluate the recommendations of the PBSD and the Corps and FDEP will evaluate the same in accordance with their established procedures. The PBSD will implement the recommendations that emerge from the review by the Corps and the FDEP. OR042680;1/FP1 98 Page 193 of 358 Page 194 of 358 Apr 02, 1997 — 12:01:39 0:\0WC\0102\PR079501.dwg MARIANNA 1 IrlegN M 11114r1.00� A k. ONVlLLE PANAMA CIT .41r �� Sr. AUCUSTINE allb I'l`4 OCALA 'AYTONA BEACH 1 NIIIA ORLA tI KISSIM\, E T AINES Lt(r l"`-+++• =RADE 'ON `' PROJECT L"x LOCATION ECHO=EE • } NAPLES 1 jjj L,L V MIAMI irti ai11111 MEIERIIIIIIIM VIRTAI UTTIII1° , 1r!4111Mii 'r`UI R "11"11IUUW COLLIER KEY WEST !f NB:lil t COUNTY II 1 iii . . IP INNS illifellitillaEll IIIIRIIP ..aw.16..;∎� IIIIMINIIiii- F WY LOCATION MAP PROJECT: CLAM BAY Figure "PPLICANT: PELICAN BAY SERVICES DIVISION 1.1(a) WILSON - -- MILLER S , OL�ER, E: REV PICk 32.33 R.' '99' 33 49S 25E P EN SCRPg A n ' CO Cogrrm EN61Nmm, NOElO?080-OOl-ERPAP n�PER-79 SORYN70ld fLA3ND®CAPi ARCIG7tCii t CONSraOCRON WetnctRa y �, NO. SHEET STEPHEN MEANS WOO Why l.:,a n: a1N�rk n..wiss %.1 (p)N0-+ao n.Nrq M3-nu LM.B./918 i ar 35 Fu. REG. 36644 Apr 02, 1997 — 12:04:16 0:\0W 0102\PR079S02.dwg 1 t1ti� VAN DERBI� VOL� �. T BE,gCH t . illlir �� , ROAD 1 c ipr j pir c 1�•� i I r- Ili) iir," -mg 400 ku 4. ' �o O ' . F-1–n A,..,,1 I I , 10/11a„(- -iii 4 ,,,,,,,,ii,. . .eir rn x lekk \elAt., --1. - '‘ ,. A 41117-13 - t-T O k it"iii ',...,:i,... .,.) ,..'r1 k , 4�1 ,41”; @ t. IF n,,.sri 1�,\^ d. .Q \ �' t / 1992 DIE-OFF AREA = (7.4 cc.) LOCATION OF 1992 MANGROVE DIE-OFF AREAS PROJECT: CLAM BAY Figure APPLICANT: PELICAN BAY SERVICES DIVISION 1.1(b) WILSON �'"'~ COLLIER ° APR., 7997 410- LEWIS ENVIRONMENTAL S2 ""°495 25E """� SERVICES, INC. PROJECT f 080-oo7-001 ""PER-79 MILLER �.r^o.NO. - STEPHEN M,N ui.B./919 2 or 35 Page 196 of 3 : Apr 02, 1997 — 12:04:56 D:\DWG\0102\PR079S03.dwg I ,/ t��.,.... ANDERB1 LT CA D I.� �,�� BEACH R......N , ...s,,„.........t lah.,/)c14,„„,,i, 1 N I il■ ,, 11M116' � . > / ■CIEV 4 \ I i" --1 41----:p--- lli ft.,;3$■ A 1.-P.11.1111: r: 4i'''• Aigib lg i Pitdr! '1- 0 , 'A \ , 40 ce'4o� �} ,_t; : :rte, ' �� Q ,:?.7.„)4 1 f\ C ., _ 4 - 0 \ ,o �t1, 7 (n l o ' ^ ‘ • � > NNE' O f 0 BAY 50 4 ..=_ �__ ,:: \ d ‘ S \ j 1995 DIE—OFF AREA = (29.6 ac.) LOCATION OF 1995 MANGROVE DIE-OFF AREAS PROJECT: CLAM BAY Figure APPLICANT: PELICAN BAY SERVICES DIVISION 1.1(c) WILSON LEWIS ENVIRONMENTAL COUNT: COLLIER °", a., 1997,sm 0- 2_]3 fa"49S 25E leer SERVICES, INC. z OAO_OO,_(RPAP PER_79 MILLER �army Na. , ►,� STEPHEN MEANS Payc t99 vf958 L.Af B./9l8 3 ov J5 FLA. REG. 36644 Apr 09. 1997 - 06:26:40 0:\DWG\0102\PR079SO4.dwg i VANDER� .. - , - ,.. eik D 1 , iiipp 1 gI�T B�� EAC H 1 ROAD� a 411P --- (1#. "s"-- 11111d 411 0 illi ' : '■ 4• .-\ ' 714 V r- iT' ,.�� i �.R. Tc.,‘ t\1\,„ 44 . . ax„.. -17% 1 f_:5_ ,_-_..; - . igi 0 414 7---,04 id --,-, it `�7 Jed .(:) ; cI K 6r::> 1 -11-...■ X �1! 4111 IBC , .IiJ- ! cn ,.___0 8 Q ,� ti 0 et5 _ . NNE' N � ° � CLAM o o �,`` �! .� BAY �` /:iv N. i FEB"• 1996 DIE—OFF AREA = (8.9 oc.) TOTAL DIE-OFF = 45.9 ac. LOCATION OF 1996 MANGROVE DIE-OFF AREAS. PROJECT: CLAM BAY Figure APPLICANT: PELICAN BAY SERVICES DIV/S/ON 1.1(d) WILSON e COLLIER PR.. 1997 LEWIS ENVIRONMENTAL 32:;, """,9s ""25E "" SERVICES, INC. 0102 080-0O1-ERPAP ""PER-79 STEPHEN MEANS MILLER ORM°�"°"a L.M.B. 918 4 or 35 FLA. REC. 36644 Apr 02. 1997 — 12:06:09 D:\DWG\0102\PR079508.dwg _ tSllr.... i TO �• e WIGGINS ��` INNER PASS = • IAMy d IV o Q 1 � III. , C • • ti vs r ..,...e.,3 z,,,,. , ,_...; * 14 (4., ,,''').' s. , CLAM itr 11..% PASS ` tp.:4_, 1 . ) %-.1.1 1(4,1* , (fr ,---.;' * f(\6 . 44 OUTER 1 11' CLAM4"° 8 i fBAY j,'NNE' BAY ?��• (7f7.1 • TIDE GAUGE ■ SALINITY I0 TIDE STAFF GAUGE 0 CURRENT SALINITY AND TIDE GAUGE FIELD STATIONS PROJECT: CLAM BAY Figure '1 aPPLICANT: PELICAN BAY SERVICES DIVISION 3.2.3.1(a) WILSON TACKNEY AND ASSOC. INC. COLLIER °U2PR.. 1997 I . SEC 4.9 1NV av Moe COASTAL ENGINEERING . 49s 25E R�Mo MILLER NO 102-080-001—ERPAP PER-79 aenm e►/DP Ma ytaT MOs II T. TACXNEY Pogo 100 of.'i.6 L.M.B./918 8 a 38 FLA. REC. 20535 i pz ?a . W } r E N z it — N Uri as E ii 1 r 3A+813- S ..■�,`, I I ■ 01` l ) ,.. .,.. .":. 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PM , • 1 , we' TY•iiimma 11 ■!�� T !III o iILPROJi,,c,-„, I I ► i�� c ' ■ -r-1 o 1 .... —1 Ili I: rill rl X 0 Ii i. b 11011.4 1111 CLAM ItAY 1141111111 MI; ::. 411111111111101111limiT elm .111 111 I Pi- it 6p,...,'- _/_- - t� Ir' �..,,,„ : 11 ii . . LOCATION MAP PROJECT: PELICAN BAY/CLAM BAY-SEAGATE CULVERTS IMPROVEMENTS Figure APPLICANT: PELICAN BAY SERVICES DIVISION 4.5.1.(0) muwtr. COLLIER 01/97 WILSON MILLER ,� T495 25E NW NM PLANNEss EW KoNrerru. CONSULTANTS.ENGINEERS. 010381 PER-79 SOUVSroks.LANDSCAPE AACtuTECTI !CONSTRUCTION MANAGff,'R.7 STEPHEN A. MEANS ��ao� 1OIJiR uRtaN!PESE.sOt OWN SW/ow NO. '>,UT NO1 STEPHEN NEC /36844 • atop Dams I�i��61�Q�4OiOwfw.O9:eu.a��or-year rw.WO«0-4ew PIP<K�1 Ks-m0 J.0 R/319 12 or 35 . Apr 02. 1997 - 12:09:50 D:\DwC\0102\PR079513.dwQ axcr. r.zr jr. .. TIERED SAND CEMENT MACS EXISTING TRIPLE 24' ROUND +b REINFORD in ftM E°igiimp— CY U 4 L PLAN VIEW • XISTING GRADE C SEAGATE DRIVE ��TYPIC -- XISTINALG)HEADWALL 11 II 1 1 I 1 --- = -...A.i I --- La 4.1 SECTION EXISTING CONDITIONS PROJECT: PELICAN BAY/CLAM BAY—SEAGATE CULVERTS IMPROVEMENTS Figure . APPLICANT: PELICAN BAY SERVICES DIVISION 4.5.1.(b) awn: COLLIER aTE 01/97 WILSON - = - MILLER , ,� ""'�9s �`25E _FILE NM Puina>Ra ENVIRONMENTAL CONSULTANT%.EMMEN% Of03-OBf-OQS PER-79 SURVZYO>m,LAxuacArs AACWrTZCT$s CoNSTWUCnON 1lANACan am er/or ND. OW ND: ' STEPHEN A. MEANS am awry>+..PO193RR a1F8 °Nn.eMi N1 8,WM a4/-404o n:WI)sa-ssu J.C.R/319 f3 or,55 F & REC. /35844 ,ex c r. ,•.,p �..rim.■■.. TURBIDITY BARRIER - EXISTING TRIPLE Swo crD cNT ears 24' ROUND REINFORCED CONCRETE PIPE (TYPICAL) Y. 41 in 0 In 16 E 1 'e . •:•�.•t•;r. i iii viii i 0 eilq /AI D% 1_ alp U / j TURBIDITY BARRIER 0 v EDGE OF WATER PLAN VIEW I'-20' INSTALL CONCRETE HEADWALL, 3 - TIDEFLEX CHECK VALVES AND RIP-RAP SEDIMENT BASIN SEAGATE DRIVE CXISTING HEADWALL MATCH EXISTING I (TYPICAL) BOTTOM ELEVATION rT --- ---� 1 ----�- ---T 11 11 ' . . VJ LJ EXISTING GRADE TOP OF RIP-RAP SECTION ELEVATION = (-).30 I" . 20' HORIZONTAL N.T.S. VERTICAL PROPOSED IMPROVEMENTS PROJECT: PELICAN BAY/CLAM BAY-SEAGATE CULVERTS IMPROVEMENTS Figure APPLICANT: PELICAN BAY SERVICES DIVISION 4.5.1.(c)ISM ME: COL WILSON MILLER B 49SR 25E 1'97 P Ettm rorrN. CoNSUtTA TS.ENCR�te>ale, hloraa0 f03-081-005 ME PER-79 SvRVSY0fq.8i0stlGRIDOlsCas !ConstaurnON WNA6ptf STEPHEN A. MEANS Kt aeao a.op r..:�%r. N. r,.lo i tree•= )! - 4$ f..(Nr)MS-11119 oerw J.C. /319 X 14 ar 35 _ roe-aes► rr... Nr FLA. REG. 136844 Apr 02, 1997 — 1211:29 0:\OWt\0102\PRO79S15.dwq VWATER LEVEL w j U F. VARIES H • o o 6 II n t I I I I 1/ /Fr METAL BENDING EXISTING 24' RCP 316 STAINLESS 43 / \ I I \ / / RED BALL TIDEFLEX (TF-2) CHECK VALVE N.T.S. CHECK VALVE DETAIL • PROJECT: PELICAN BAY/CLAM BAY-SEAGATE CULVERTS IMPROVEMENTS Figure _ APPLICANT: PELICAN BAY SERVICES DIVISION 4.5.1.(d) COWER a1c O J/97 WILSON { MILLER R 1� : NW Nil 16 49S 25E PLANNERS E1ITmONYOr?AL CONSULTANTS,ENGINWn, MOH= SURVEYORS.LANDSCAPE ANCffiscTs a Cor raucnoN WNAGEU 0105-081-005 FLY�-79 D IN m/L NO. lEET roe STEPHEN A. MW aeoo Baum,L.Ry i.Qfi.1i,°Nr►. 141 AP.(M1)ka+ae n■mil)Ks—nu J.C.R./319 _ 15 Or 55 fu. REC. /36844 Apr 02. 1997 — 12:12:03 D:\DWG'\0102\PR079S16.dwq OPTIONAL POST POSITION PRINCIPLE POST .-J 20't POSITION (CANTED _ P. 20' TOWARD FLOW) POST 6' MAX. J j '7 FILTER FABRIC (IN 1 O 1 SEC. 985 FOOT 8 EC.) I FILTER FABRIC `,n 00 II 4 I I / I I / I SILT FLOW O —'bo i� I 4 _1 ^ = 8" BURIED DEPTH i i°D II II v U U ELEVATION TYPICAL SECTION SILT FENCE N.T.S. ANCHOR BALES WITH 2 — 2" x 2" x4' STAKES PER BALE FLOW BALES • TO BUTT PLAN LOOSE SOIL PLACED BY SHOVEL 2" x 2" & LIGHTLY COMPACTED ALONG STAKE UPSTREAM EDGE OF BALES i II.. 3 2 .\-I`.R .-j`-\v�` FILL SLOPE .\SECTION _ TYPICAL BALE SILT BARRIER N.T.S. EROSION/TURBIDITY CONTROL PLAN . PROJECT: PELICAN BAY/CLAM BAY-SEAGATE CULVERTS IMPROVEMENTS Figure APPLICANT: PELICAN BAY SERVICES DIVISION 4.5.1.(el) COMM COLLIER a1c 03/97 am lam WILSONY MILLER "` 16 , 49S 25E P ENTIM YENTAL CONSULTAN'1E.EN;1N . X0103-081-005 t�PER-79 SUR MS LANDSCAPE ARC107NC11 a CONStEUCTION ILtucto moon n/cr Mo MEET wo STEPHEN A. MEANS MO a wnRviopp.loopxo+oN N.S4 lMW 141-4641 Paz l+u)NO-OTIS _ J.0.R./319 16 or 35 FLA. REG. 0544 Apr 02. 1997 — 12:12:40 D:\OWE:\0102\PR079517.dwO CLOSED CELL PLASTIC FOAM SOLID POST OPTIONS: FLOATATION (6" DIA. 2" x 4 OR 2 1/2" EOIV.)(12 LBS. PER MIN. DIA. WOOD; STEEL 6, MAX.BUOYANCY) 1.33 LBS/FT. MIN.) I X18 OZ. NYLON I g/8" POLYPRO w ce c REINFORCED PVC .TAB/ROPE (600 LB. c FABRIC (300 PSI BREAKING TEST )WITH LACING �. STRENGTH) o GROMMETS --� _ —I-I- TYPE I lie e FLOATING TURBIDITY°~ f' GALVANIZED STAKED TURBIDITY BARRIER NYLON REINFORCED BARRIER � PVC FABRIC (300 PSI TEST) DI .S' STD. (SINGLE PANEL FOR DEPTH 5' OR LESS). NOTE DJ .5. STD. (ADDMONAL PANEL FOR DEPTHS )5). ��O TURBIDITY BARRIERS FOR FLOWING CURTAIN TO REACH BOTTOM UP TO DEPTHS OF 10 FEET. ——— STREAMS AND TIDAL CREEKS MAY TWO (2) PANELS TO BE USED FOR DEPTHS GREATER THAN — _—— % (11 %� BE EITHER FLOATING,OR STAKED ]GIVO.LEEET UNLESS SPECK. DEPTH CURTNNS SPECIFICALLY LIMITS OF TYPES OR ANY CORONATION OF D FOR IN THE PUNS OR AS DETERMINED BY THE SHORE LINE / / CONSTRUCTION TYPES TMNT WILL AIR SITE ENCNEER CONOITKINS ANO MEET EROSION LIMITS OF 1 SHORE LINE CONTROL MD WATER QUALITY REOUREMENTS. THE BARRIER NOTICE CONSTRUCTION / TYPE(51 AT THE PAPONTS OF TYPE I MAY BE SNILAR OR ——— OTHERWISE SPECiION MESS EN N THE PLANS. •7ENTIGV. TO PROPRIETARY DESIGNS. ANY HOWEVER PAYMENT WILL BE UNDER INFRINGEMENT ON THE PROPRIETARY ROCS or THE THE PAY WAS) ESTABLISHED DESIGNER SHALL BE THE SOLE RESPONSIBILITY Of THE IN'ME PLANS FOR FLOATING USER. S S THE NS FORR TYPE I &NU.BE AS TURBIDITY TURBIDITY MRRIER AND/OR STAKED TUMMY WIRIER. POSTS N BARRIERS STAKED TURBIDITY BARRIERS TO BE INSTALLED IN VERTICAL POSITION UNLESS OTHERWISE DIRECTED BY I.nAaBnITY BARRIERS ME TO BE USED N ALL PERMANENT TURBIDITY BARRIER APPLICATIONS THE ENGINEER. BODIES OF WATER REGARDLESS Of WATER DEPTH. 2. NUMBER MO SPACING OF ANCHORS DEPENDENT ON WATER VELOCITIES. 3. DEPLOYMENT Of BARRIER MOUND PILE LOCATIONS MAY VARY TO ACCOMMODATE CONSTRUCTION OPERATIONS. 4. NAVIGATION MAY REQUIRE SEGMENTING BARRIER DURING CONSTRUCTION OPERATIONS. TURBIDITY BARRIERS N.T.S. • EROSION/TURBIDITY CONTROL PLAN PROJECT: PELICAN BAY/CLAM BAY-SEAGATE CULVERTS IMPROVEMENTS Figure APPLICANT: PELICAN BAY SERVICES DIVISION 4.5.1. (e2) COUNTY: COLLIER ° 03/97 WILSON MILLER 49S 25E PLANNERS E,mRowrsNw. CONSULTANTS.Exam= 0103-081-005 PER-79 SUNYmYOR8. PLANNERS, Animals &CONNSUCEnON Maw= nom 17010 N0. :,IEEr N01 STEPHEN A. MEANS =AM mace k�I O Nifty LAWR Q!ap.o M :WA s Ws)0E11-4040 no(sal)143-1711 _ J.C.R./319 17 or 35 FLA. REC. 116844 Apr 02. 1997 - 12:13:45 0:\0WG'\0102\PR079S18.dwq MATCH LINE, 1 TG-2 INNER CLAM BAY , to • TS-1 P.■.r. L I 1 O Q �7 4CONSRCTIEN NORTH T5-3 1 r BCORDIALK TS-4 0 a CLAM PASS • e.„,,...-moo T5-4 O 4 TS-6 sauIH K W KORDYLILK 1 75_2 `MIDDLE 6 o m OUTER CLAM Ar BAY TG-3 INNER ! Apr 02. 1997 - 12:14:53 D:\0WG\0102\PR079S19.dwg +2.5 ! GULF HIGH 1 I I +2.0 +1.5 PHASE IAG : BAY HIGH .� ..�.M.r..1..-•-H4••:.Ni....... •...w.. ....ye �A�...� 4.r +1.0 .....r......•.W•••rt:••p.- , -ww.w..w'•♦.r • •AY9. Bay Level �...• • Hi % Av. Cull Level ■• •• L BAY LOW +0.5 �''1' • GULF LOW 0-11N) • 9;00 10:00 11:00 12:00 13:00 14:00 15:00 15:00 17:00 1900 1t00% 20:00 21:00 -0.5 Is -1.0 -1.5 I I I 1 I I I I I I APPROXIMATE MEAN TIDAL CYCLE FOR GULF GULF AND INNER CLAM BAY - JUNE 6, 1996 100% UPPER CLAM BAY % GULF of MEXICO HIGHER I 50% 10% INNER CLAM BAY 0 r— -1.0 0 1., 0 2.0 3.0 WATER SURFACE CUMULATIVE FREQUENCIES PROJECT: CLAM BAY Figure _ APPLICANT: PELICAN BAY SERVICES DIVISION 4.5.2.(b) WILSON COMM 4.5.2.(c)COLLIER °" rPR., 1997 4.5.2.Roe TACKNEY AND ASSOC., INC. 9 " ,9S 25E "" COASTAL ENGINEERING NO102.- -001-ERPAP "`PE7a-79 MILLER �II/�. NM 0. T. TACKNEY Ago 21 z pc 1 L.M.B./918 79 or 35 Fu REC. 20583 Apr 02. 1997 - 12:16:47 D:\OWC\0102\PR079520.dwg MATCH LINE -1,4 INNER -1.5 CL -13 BAY -1.4 -3.0 t 21 i116 -1A -1.0--,_, PNIII -1.6 -1518 i I . -22 4 -23 -"+-24 P ) -3.1 (1.6 26 -2.0( -2.0 -22■7 1.6 - ♦ -15 }ti}�, NOM mow -2.2 -2.0 -1.9 UPPER P� • a CLAM -2.5 x %+.3 BAY CLAM .`' �� Z. PASS -1.1 +.2 o -20 • -2.2 0 0 -1.1 ~ -2.2 X _g +1.0 W -1.4 uJ •+.6 M -1.9 _ ,1 M ,ti ii -10 -.3 LI_ O `�1 O _ r Muni- -44 f eoum+wx• J --1 n -1.7 ,ti NORTH C -1.6 %. BOARD ■ 0 -1,6 -15 -2.1 -1.9 -1.6 OUTER CLAM BAY S1 -1.7 r$�\ -1.7 -.9 -2.0 jp IAY • -1.6 �"� -1.5 \ MATCH LINE REPRESENTATIVE WATER DEPTHS PROJECT: CLAM BAY Figure APPLICANT: PELICAN BAY SERVICES DIVISION 4.5.2.{d) WILSON oourtr. COLLIER cih R., 1997 110- TACKNEY AND ASSOC., INC. 23J �'`49S "�`25E Illy COASTAL ENGINEERING � N0102-080-001-ERPAP FILE PER-79 MILLER ° �/°L > 0. T. TACKNEY Pap +^an s- 20 a 35 _ FL& REC. 20583 Apr 02, 1997 — 12:17:52 D:\DWG\0102\PR079S21.dwg R=0.31ft 15% UPPER STORAGE AREA UPPER CLAM I BAY ( O s -R=0.3 ft C.) 16% X 4 g CLAM , PASS iBOAARRDWA L 0 o `--'1 R=0.38ft 5< 18% L.L_ lJ J D i L ill! . L'- INNER cl( CLAM BAY LL R=0.39ft —J 19% M LOWER 641 STORAGE AREA 4 R=1.49ft MIDDLE e-71 CLAM BOARDWALK PASS R=2.01 ft . 100% f'7 . n - MODEL- 1 MODEL-2 (UPPER CREEKS & BAYS) (STORAGE AREAS) PROJECT: CLAM BAY Figure _ APPLICANT: PELICAN BAY SERVICES DIVISION 4.5.2.(e) WILSON `°""" COLLIER a12PR., 1997 4.5.2.(f) TACKNEY AND ASSOC., INC. sr.*i9 �49S HG( """I -0 COASTAL ENGINEERING N"�"o"°-'Oeo-OO1-ERPAP PER-79 M I L IvBRof 3 58 WHIN NOW NO. SHEET NO: 0. T. TACKNEY L.M.B./918 21 a JS FL A. REC. 20853 Nov 24. 1997 - 10:02:57 D:\DwC\0103\PRO7922Aewg / . II jepieloir SHEET 4 CLAM PASS . n • SHEET 3 4 , tk,i 1 0 + i SHEET 2 W '• if 1 L j' SHEET 1 0 isi J D CD OUTER CLAM BAY REFER TO FIGURES 4.5.2(g)(2) AND 4.5.2(g)(3) FOR BREAKOUT SHEETS ALIGNMENT OF SECTION 4A OF THE CHANNEL FOR PERMITTING PURPOSES ONLY PROJECT: CLAM BAY Figure APPLICANT: PELICAN BAY SERVICES DIVISION 4.5.2.(g)(1) WILSON COLLIER o"T PR., 1997 lik TACKNEY AND ASSOC., INC. sm 44.9 11ry �xc 97 COASTAL ENGINEERING p 02—O8O—OO1—ERPAP t1 PER-79 MILLER r �. ow"a O. .R��K E3 L.M.81918 22o or 35 Page 216 of 358 Dee 10, 1997 - 123231 D:\OviC\01:.TPR0793.Ads9 I SHEETI SHEET 2 30-9076 70-8076 -- Holodule Mgoe Covered 20-30% 40-50% Short Gross Holodule Mangrove Algae Covered Mangrove a c 60-70% ii ,y Holodule 1,11 38% to / West Side / 30-40% Holodule 40-50% Holodule South 800rdwolk 44Nmiimmoilk 40-5076 < 18% Holodule Restricted to West Side 65-70% Holodule Hargrove • Mangrove 207E Thoiossio 20'* Patchy - FOR - R 4ITTING PURPO ES ONLY PROJECT: CLAM BAY Figure APPLICANT: PELICAN BAY SERVICES DIVISION 4.5.2.(g)(2) WILSON MIMI cou►m , 1997 4:11). TACKNEY AND ASSOC., INC. 'eft 495 "°`25E 11 9 COASTAL ENGINEERING NOf02-080-001-EiRrPAP PER-79 MILLER ossv filar la OW Kt O. , C.M.B./918 22b or 38 Page217of358 . One 10. 1997 — 123427 D:\DWK'\0103\PR07L„_.;.duq SHEET 3 SHEET 4 t.,10-20X • Heavily 0-1% re Scoured t al • i <30X < 5% 10,t 1 Heavily Shaft—AN)oe / Scoured Covered Mangrove 10-15% ....N.N\ 50-60X Short—Algae Heavily Covered Scoured Mangrove Mangrove 10-15% Short—Algae 60-70X Covered Heavily Scoured 5-10% Short—Algae Covered 10-20% Short 1 60-70X Scoured I Heavily Scoured < 5X Scoured ' Grovel—Sand � Mangrove 20't 22't 5-10X Very Heavily _ Scoured 'R PER RTING RPOS ONLY . I PROJECT: CLAM BAY Figure APPLICANT: PELICAN BAY SERVICES DIVISION 4.5.2.(g)(3) WILSON C0""'` . c.occ °' 1997 41). TACKNEY AND ASSOC., INC. "; 49S 25E 11 COASTAL ENGINEERING 111OW2 o8O-CO —79 MILLER 0. 1. UCKNEY loom warm.Y. silt«Q Fu► REG. 20953 L.M.B./918 22c or Jd Page 218 of 358 Dee 10. 1997 — 12:05:41 O:\DwG\0103\PRO79 ..4■9 r UPPER CLAY a (-?? ' BAY ,... 1 Approximate - Ending Point O 1__5f CHANNEL O �i/, R-37 0 730 ft LENGTH c.) X X INNER BAY , .4 Li L.._ Approximate 0 O J-'4% Beginning U. Point Li- -J J D 0 (, NORTH e BOARDWALK 14 ,,,. ../ R-36 Approximate i. �� Ending Point R-39�1 ''i+�—CUT I 2 ,/ - 20ft CHANNEL • �ti 550 ft LENGTH Approximate Beginning 516 ^ Point f// APPROXIMATE LOCATION OF SPOIL DISPOSAL AREAS FOR CUTS 1. 2 & 3 1 AND APPROXIMATE LOCATION OF DNR MONUMENTS SILT FENCE/ FILTER FABRIC DUNE ■ 1 GULF BEACH SPOIL N TYPICAL SECTION FOR 1 SPOIL DISPOSAL ANCHOR L HAY BALES EXCAVATION/SPOIL DISPOSAL PLAN CU T S 1 & 2 & 3 FOR PERMITTING V J & & PURPOSES ONLY PROJECT: CLAM BAY Figure APPLICANT: PELICAN BAY SERVICES DIV/S/ON 4.5.2.(h) WILSON Y: COLLIER °"x.. 1997 4.5.2.(k) TACKON ., . ;� TM'�9s "° n� ;" COASTAL NEY A ENGINEERING D ASSOCINC 110102-080-001-�pAp aEN-79 MILLER � 1W WOO KR 0. T. TACHNEY L.U1.8./918 23 a 38 FLA. REG. 20053 i Page 219 of 358 Nov 24. 1997 - 10:13:27 0:\0WG\0103\PR079S2&.o.q SHEET 1 SHEET 2 Approximate %. Ending Point ar.......----CUT #3 CUT #4B 630 Pit A NGTN 20ft CHANNEL �_ 100 ft LENGIN� `1� Approximate CUT #4C Beginning r it Point 40ft O4ANEL �,, 1070 II tDIG1N - *Mr CUT #40 ,'. CLAM , 111111 MIDDLE 2c0 II MTH PASS = C BOARDWALK ��_— •■ i 0 ' 0 0 :,` CUT # 4A X ; 30ft CHANNEL LLJ �., 2330 ft LENGTH M CLAM O L.. PASS ° U 0 X w 1// / -,,.. U- , n La_ \ % SOUTH C 7 O j r BOARDWALK I LL di,..)J D CD OUTER CLAM BAY EXCAVATION PLAN FOR CUTS 3 & 4A THROUGH 4D FOR PERMITTING PURPOSES ONLY PROJECT: CLAM BAY Figure APPLICANT: PELICAN BAY SERVICES DIVISION 4.5.2.(1) WILSON • ` `• COLLIER ' iPR. 1997 TACKNEY AND ASSOC., INC. ; P: NZ:251 97 COASTAL ENGINEERING NO102-080-001-ERPAP PER-79 MILLER o gr a.ta. , , D. T. TACKNEY L.ALB./918 24 or 38 M REG. 20053 Page 220 of 358 New 06, 1997 - 15:22:23 0:\0w0\0103\PR079525.dwg SEE NOTE-1 -\ V o Ncw l p o' NG O Cut 2 cur 3 _ -3 ft -3 ft Jr 15 ft 01, 1, 20 ft I CUT 1 CUT 2 & 3 /vo' NCw -4 ft 40 ft ■I, CUT 4A 1 vo' NGw -4 ft J. 520 ft I, /( CUT 4B /( V 0' NGVD ice' _I-- SEE NOTE-2 -4 ft 01, 530 ft Jr 5—, NOTES: CUT 4C 4- 1. EXISTING SECTIONS S 3— VARY. W 2- SCALE 2. SIDE SLOPES 0 ANGLE 1— OF REPOSE (ASSUMED 30') , , , , I 0 2 4 6 8 10 - NORIZ0NTAI TYPICAL CUT SECTIONS PROJECT: CLAM BAY Figure APPLICANT: PELICAN BAY SERVICES DIVISION - 4.5.2.(i) WILSON CAWS: COLLIER " CPR., 1997 TACKNEY AND ASSOC., INC. =311 "m'25E "E"495 COASTAL ENGINEERING Z o8O—OO1—ERPAP ,1 PER-79 I MILLER - . ,. > 0. T. TACKNEY L.M.B./918 25 aF 38 FLA. REG. 20553 Page 221 of 358 Nov 06. 1997 - 15:59:52 0:\OWC\0103\PRO79526.d-g INVERTEBRATES OBSERVED OFFSHORE ALGAE OBSERVED OFFSHORE Porifero Algae Aplysina fistvlari.s Chondrilla nucula Green algae (Division chloroohvto' Cin .chyrella alloclada Acetabularia spp. Cinachyrella kuekenthal Cavlerpa sertvlarioides (Bona delitrix Caulerpa rnexicana Cliona celata caulerpa peroliJera Jrcinia spp. Penicillus capitatus Niphates erecta Ulva lactuca Haliclona spp. Ulna fasciata Cnidario (corals) Udotea spp. Cladocora arbuscula Codsums spp. Diplorin spp. Red algae (Division rbodoohyta' Murieen spp. cracilaria tikuahiae Parazoanthus. parasiticvs • "Hypnea spp. Siderastrea radians Salenastren hyades Brown oboe (Division ohaeoohyta' Leptogorgia hebes Sargassum filipenduta Leptogorgia virgulata Dictyota divaricata• Polychaetes Aricidea philbinae 'Species believed to be correct. Capitella capitata Fabricia trilobata Pricnospio heterobranchia Tunicotes Didemnum spp. Styela spp. Mollusks Fighting conchs Strobus alatus Pen shells Atrina rigida Echinoderms Beaded sea star Astropecten spp. Long-spined block urchin Dladema antillarum Netted sea star Luidia clathrata Nine-armed sea star luidia senegalensis Variable urchin Lytechinus variegatus Five-holed keyhole urchin Mellita quinquiesperjbrata Anthropods Stone crab Menippe mercenaria Horseshoe crab Limulus polyphemus Spider crab Lib inia emerginata VERTEBRATES OBSERVED OFFSHORE Fish Leather jackets 01iguplites saurus Seo robin Pri.onotus scritulus Sand perch Dipiectrum bivittatum Toadfish Opsanus beta Tiger golby Cobiosoma rnacrodon INFORMATION PROVIDED BY Sheepsheod Archosargus probatocephalus TURRELL & ASSOCIATES. INC. Pinfish _Lagodon rhombeides Nurse shark Cinglymostoma cirratum DOCUMENTED ORGANISMS IDENTIFIED OFFSHORE FROM CLAM PASS FOR PERMITTING PURPOSES ONLY PROJECT: CLAM BAY Figure APPLICANT: PELICAN BAY SERVICES DIVISION 4.5.2.(m) WILSON COMM COLLIER ° rPR.. 1997, 40- TACKNEY AND ASSOC., INC. "'49S "�25e 97.2633 COASTAL ENGINEERING 1110102-080-001-ERPAP PER-79 1 MILLER o�IN/D•NO. > •RSCioes3 L.M.B./918 26 or 38 Page 222 of 358 ----_—__ • _ j �� = N ;._ = ..."^". -�. =r te-.a- _°- -•= Q-- S-" 0 250 500 1000 SCaI.E 1•.500•-0" **•". �'� ----- �:: 1 l KM AN 1!117 r_...., .. --u�� b� "`--d�o --- \eoANOwALK M � � _ � YANGRO VES f �a _ t /11,1-t' -.`- - - .ter __I • 42t = _ mss' --. 3 --7-..--&- ..,,t-,t, '�,.,e- 4.;_, uANGaOVE 5 dr* 4121 --_ .. . =-114- _ -- —� 410.. _=;:t tot. -- _ --_-' . u a" ,.,.-.,---- - 'mac- ..:_Y�- --_ `---- - . O.3,-1-,'-. ...... 'S.�i_ •� ` •-- •�-' -i -`7 -sue. f4--'TA 6-mac' 4112* i ,........-- tom. , A 51 -_ z � /_...._______... , 7.71.r.4.• \jt,,,. .• ____r_,,__._„,:„_. .-„_.. _____,.._ . .-. C• .fry ...11..11 Tl 'cFr ua7cT -r Alf. ''.1.V. , ,'--.--C-.-.- ---a'` - - --.- { .. - �-^~tea .-i_-. 7�;x-- -* 'r '.7----"-- :---"-- -' 'Ct--- yam_t.- ti --.-_ 37OUTER: r `"� 3� .. ;` - iw COLLIER COUNT? 'CLAM RAY MANGROVES r".= = BOARDWALK te. f X22_• --- r.--'' . ' `..-��..'''—._. - t _ �Frc' $ - T TA:.... ��-c- �:i►r ate. r w.y � �.��. �-r-.---. yraamms.. _ - te f t ,nanMT.tnraccn w to p0 nrwc_ ...- Turrell & Associates. inc_ Panne & Environmental Consulting . rs_ cftry.-R.Fivi le` .. 3564 Exchange Awe. Sulla B. Naples. n 33942 CLAM PASS HARD BOTTOM TRANSECT LOCATIONS HARD BOTTOM MOPED I.T.T. REvtstO,. Ow6 NOE 1557011117 7n7l TRANSECT T LOCATIONS MANN MANN wMAMA 5 SIEET 27 of 38. Figure 4.5.2.(n) DATE .u25r5S SCALE 'r • 500 - JOB N0. 5370.5 , SEC. cm, NOC • Page 223 of 358 • Dec i i 1997 — 15:16 47 D\DwG\0103\PRO79S28.del I. 1 cl) C, I O CLAM o PASS ilrill° 'I' SPOIL DISPOSAL AREA 4) OUTER CLAM BAY • SPOIL DISPOSAL LOCATION FOR PERM111'fING PURPOSES ONLY • PROJECT: CLAM BAY Figure APPLICANT: PELICAN BAY SERVICES DMS/ON 4.5.2.(o) WILSON CUR COLLIER R., 1997 TACKNEY AND ASSOC., INC. 9 rrw-495 25( 1197 COASTAL ENGINEERING NO102—O8O—OOI—ERPAP PER-79 MILLER DININ[t/Er°N0 s RE . toess t.M.6./918 28 a 38 rage Z44 or S 1 O7 _ 12.43:3: O'.DWG'XI—\ ,,. _2!,413 B 0.: 4E ` 345 9_ SPOIL . DISPOSAL AREA 7 88 .,.56 2.64 6 - 5 — 7.92 3 67 2.98 • 2.66 4 ■∎ v 3 — eF A 7.95 3.36 A 2.34 .�' .se"�� 5.09 as:'='• 4 2.7 1 1`.. 4 7.02 2.1 O r .I .aI ` , _1 — �� 1.97 I .49 172 SECTION A-A 4 4 255 SCALE: 1" = 40' 7.78 .43 ..27 7.59 81' B PLAN VIEW SPOIL DISPOSAL AREA 6 -- 3 - rre;..J.r./74,74W1 1 - Al/1:4 -. 0 - ,, jyydei 0-1 - - EXISTING ELEVATION PROPOSED ELEVATION NOTE: SECTION B-B EXCAVATED BEACH OUALITY ;', ;:., PROPOSED SPOIL SAND WILL BE RELOCATED TO GULFSIDE FOR BEACH PROPOSED SE NOTE)EXCAVATION RENOURISHMENT. M l\ TB RMORARY RETAINING SPOIL DISPOSAL FOR PERMITTING PURPOSES ONLY ROJECT: CLAM BAY Figure APPLICANT: PELICAN BAY SERVICES DMSION 4.5.2.(p) couNrt: WILSON COLLIER °'TAPR., 1997 TACKNEY AND ASSOC., INC. sm.34.9 495 R"25E iil9i COASTAL ENGINEERING O10 080-080 -001 "`NO MILLER6RNN sr/Do NO SNEET NO D. T. TACKNEY ILg.226-e4.3C3 - L.M.B./918 280 a 38 FLA. REG. 20953 +=y,r _ -< '=y+-- ,pry + T.w 1,. _ -•...;.... • ad . EL F t q4,115 .,�r,At y%1 YS i i t/t hg,.A. (� ,1 F y�5A' ,?0 / . ,y + a‘542;r 11.t.' It''pp1+W«��y1r1d$1�" / h , - r•. - -.1.141,, ',�. � 7hloil -.h - l P ^_ i�:ter �• �� ...1 'r• k _(I�'1,':Jr M1`6,.. +L`�"t S,` 3\Vi% `i C ., L . / X 4 ._,cam! •• r r•fF + 1 •- l 1 r .,.• -. l3 � �� '; l '-r YS • lib �� •"1 � ,-,,'.43A.,-,;.; .•,-...,••:- v I T.r1t -.•.. ti 4 4 (F ,,i ..*;'7",-1 ,•+ rle .1 r' t 1Vr if ' __. ` '.'''.'2, Photo I. The west side of Upper Clam Bay looking south from the top of the Contessa, November 15, 1995. (Photo by Roy/R. `Robin"Lewis d,?. Leii'is Enviroaaemal Services, Inc., Tampa, Florida.) ,-.� , JL 3 n 12+.t-i 5 , L1uWD I I i�7 i i `I.�• �r y 'J,,,e16! o �+ t �'y-}. e1r ', rr y _., t I -, ..Li - r :,gym ,` S. • ++� Photo 2. The west side of Upper Clam Bay looking south from the top of the Contessa, December 12, 1996. (Photo by Roy R. "Robin"Lewis III, Lewis Environmental Services. Inc. 7■.unpa, Floricla.t Page 226 of 358 FIGURE 4.5.3(a) SHEET 25 OF 35 j•(/ Chi 2 • n `4 -?` t 7 { t 9 r a / c � $'- -1 °� ^ ;•+ ICY T , it rn is .,,,--....-s! ` ' !''- :Y s, r V 3• y $ +•• , • Y _ ate..ey` + `` • . ••°' _4.9,,-;;-= • - pF d• Ster . d a y ' j rte. ; • Lf. r 'f a? ' It � � ` `L . rt: - e-, Y` WILSON N PHASE ONE " `E S MILLER BOUNDARIES OF MANGROVE PROPOSED LATERAL CHANNEL PER-79 MANAGEMENT UNITS RESTORATION + EXISTING RESTORED CHANNELS PROPOSED SWALE RESTORATION Sheet 26 of 35 PROPOSED MAIN CHANNEL PROPOSED MAINTENANCE OF RESTORATION EXISTING CHANNELS Figure Page 227 Of 358 PROPOSED SIDE CHANNEL 4.5.3.'b) RESTORATION I I I PROPOSED MANAGEMENT AREAS 11 r 1 ` , a ; I k - • lvc , i '• ,40...,-F.,1- ' ' .• ••• ,I••• • • 4ayT � • • • •• 1 '•• k '• • • e • • --:S.: G 7 ail i •O f- • 1, r • j p . "i ' .. • • p4 WILSON N PHASE TWO wTE CONTINGENCY PLAN s MILLER BOUNDARIES OF MANGROVE __ ..". PROPOSED LATERAL CHANNEL MANAGEMENT UNITS RESTORATION EXISTING RESTORED CHANNELS - PROPOSED SWALE RESTORATION PER-79 Sheet 27 of 35 PROPOSED MAIN CHANNEL PROPOSED MAINTENANCE OF RESTORATION EXISTING CHANNELS Figure . Page 228 of 358 - PROPOSED SIDE CHANNEL 1 l l PROPOSED MANAGEMENT AREAS 9 RESTORATION ON 4.5.3.(c) r + 1.. .. r� _•S» Se- _ l 5 x` • r s.4 ( t F • ,t, Q' I} 6 .- ;Y.' WILSON PHASE THREE (a) " CONTINGENCY PLAN W "E S MILLER �� BOUNDARIES OF MANGROVE _ ..__ _,...._... PROPOSED LATERAL CHANNEL MANAGEMENT UNITS RESTORATION PER-79 EXISTING RESTORED CHANNELS .. PROPOSED SWALE RESTORATION Sheet 28 of 35 PROPOSED MAIN CHANNEL PROPOSED MAINTENANCE OF RESTORATION EXISTING CHANNELS Figure PROPOSED SIDE CHANNEL I Page 229 of 358 RESTORATION I I 1 PROPOSED MANAGEMENT AREAS 4.5.3.(d1) it e I . c T • A $: 4 1I R 1. 1t L' 1; 4•q, r ji a. na WILSON PHASE THREE (b) N CONTINGENCY PLAN W+E s BOUNDARIES OF MANGROVE _ .. . ._ _ __. PROPOSED LATERAL CHANNEL MILLER MANAGEMENT UNITS RESTORATION EXISTING RESTORED CHANNELS PROPOSED SWALE RESTORATION PER-79 PROPOSED MAIN CHANNEL PROPOSED MAINTENANCE OF Sheet 29 of 35 RESTORATION EXISTING CHANNELS Figure _ PROPOSED SIDE CHANNEL Y Page 230 of 358 RESTORATION I 1 I PROPOSED MANAGEMENT AREAS 4.5.3.(d2) Nov 06. 1997 - 12:25:13 D:\DW\0103\FR079534.d.9 W n n N CO J a Ln Cs1 CO 14J In>- w Li.l J 0 Z w S - n Z LL.1 ` F- w <cn Li, ° v'"t co^ Z I 1n N M w j Nov 06, 1997 - 12:26:01 0:\DWG\OtMS\PR079S35.Org INTERNAL MAIN CHANNEL RESTORATION • ft, p/ 4p/ , 1 06• EXISTING PROPOSED SECTION X—X INTERNAL SIDE CHANNEL RESTORATION M NC -If EXISTING I-� EXISTING PROPOSED SECTION Y—Y SECTION Z—Z TYPICAL EXISTING AND PROPOSED CROSS- SECTIONS, HISTORICAL MAIN DRAINAGE CHANNELS AND SIDE DRAINAGE CHANNELS. N.T.S. PROJECT: CLAM BAY Figure APPLICANT: PELICAN BAY SERVICES DIVISION 4.5.3.(f) WILSON W'"'" COLLIER 01 i PR., 1997 LEWIS ENVIRONMENTAL "° 4, "ft 62' 'Ck SERVICES, INC. mail 49S 25E i t 97 MILLER o N0102-080-001—ERPAP PER-79 h/EmL.,. . IOW p STEPHEN MEANS l.AI B./918 35 a 38 FLA. REG. 36644 Page 232 of 358 Dee 12. 1997 — 12:34:13 0:\0 10103\PR074as6.thrq • INTERNAL LATERAL CHANNEL RESTORATION eC MAN r-1r IT EXISTING PROPOSED SECTION XX—XX INTERNAL SWALE RESTORATION MHW — 1.50 FT. NGVD. MLW — (—)0.51 FT. NGVD (GULF TIDE ELEVATIONS PER D.T. TACKNEY, P.E.) SMALL LATERAL CHANNEL AND SWALES N.T.S. PROJECT: CLAM BAY Figure APPLICANT: PELICAN BAY SERVICES DIVISION 4.5.3.(g) WILSON COLLIER 1347APR.. 1997 LEWIS ENVIRONMENTAL "cr4 4•9 1w. "ra SERVICES, INC. r +31. 495 25E 1,/97 MILLER N0102-080-001—ERPAP PER-79 aOM a,./Ey NO. WM MO STEPHEN MEANS L.M.B./918 36 ar 38 M REG. 36644 Page 233 of 358 • Dec 12. 1997 — 12.34:Se D:\DWG\0103\ 79Sa/41p INTERNAL MAIN CHANNEL RESTORATION • (CHANNEL "A" ONLY) • ' )011 (1" MANUAL AND \'�. EXPLOSIVE ` • CLEARING , r/00, _ ., MAXIMUM 225 CU. YDS.• OF BOTH MANUAL AND EXPLOSION DISTRIBUTED DEBRIS NOTE; EXISTING PROPOSED ALL SPOIL DISPOSAL AS THIN LAYER OF BIODEGRADABLE SECTION X—X ORGANIC MUCK, PEAT AND PLANT FROMSEXPLOSONS. INTERNAL SIDE CHANNEL NO SPOIL PILES, RESTORATION BERMS OF UPLANDS TO BE CREATED. (CHANNELS B,C,D,1 A-6A & 1 C) TOTAL DEBRIS AS SPOIL WILL NOT 1 _EXCEED XXX CU. muuc / MANUAL AND ' EXPLOSVE /1424:1:12± 14 ' CLEARING �� 1.386 CU. YD S. 1 MAXIMUM OF BOTH MANUAL AND EXPLOSION DISTRIBUTED DEBRIS EXISTING PROPOSED SECTION Y—Y MHW — 1.50 FT. NGVD. SECTION Z—Z MLW — (-)0.51 FT. NGVD (GULF TIDE ELEVATIONS PER D.T. TACKNEY, P.E.) METHODS OF SOIL DISPOSAL *( 1 ) N.T.S. PROJECT: CLAM BAY .Figure APPLICANT: PELICAN .BAY SERVICES DIVISION 4.5.3.(h) COMM COLLIER °u'PR., 1997 WILSON 4.9 "" '197 SERVICES, INC. '9s ?5E rat 97 N010?-080-001—ERPAP PER-79N y MILLER ••'°L.M.B./9/8 ' 37 a 38 fu NEG. 36644 Page 234 of 358 1 Dec 12. 1997 - t2:35d6 DNDWG\0103\ 795x-de9 INTERNAL LATERAL CHANNELS■r 3-v,/ �t ��' ` � MANUAL \ � - CLEARING ONLY )�.�..........� MAXIMUM 441 CU. YDS. OF MANUALLY DISTRIBUTED DEBRIS EXISTING PROPOSED SECTION XX—XX INTERNAL SWALES , , 0 YANC MANUAL CLEARING r hi /i lip 0111111111 ONLY Nilkill MAXIMUM 229 CU. YDS. OF MANUALLY DISTRIBUTED DEBRIS EXISTING PROPOSED SECTION YY—YY MHW - 1.50 FT. NGVD. MLW - (-)0.51 FT. NGVD (GULF TIDE ELEVATIONS PER O.T. TACKNEY. P.E.) METHODS OF SOIL DISPOSAL *(2) N.T.S. PROJECT: CLAM BAY APPLICANT: PELICAN BAY SERVICES DIVISION Fig.5.3u re 4 .(1) WILSON °°`"" COLLIER °' PR.. 1997 'O. LEWIS ENVIRONMENTAL 4.9 tea: a SERVICES, INC. ..1431* 25E WI:.E PER-79 Oe. VAMP.o. ■*ICU•o STEPHEN YEARS L.M.B./918 38 a 38 FLA. REG. 36644 Page 235 of 358 Project Managers Ted R. Brown, Esquire Hilburn 0. Hillestad, Ph.D. Akerman,. Senterfitt& Eidson, P.A. 1205 Arvicla Parkway, Building •3 255 S. Orange Avenue, 17th Floor Ft. Lauderdale, FL 33327 Orlando, Florida 32801 Page 236 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 TABLE OF CONTENTS 1.0 Introduction Purpose, scope, of revised management plan. Differences/additions from original plan Personnel/consultants responsible Role of Pelican Bay Services Division 2.0 Clam Bay Location and Setting Maps, description of Pelican Bay and the estuary system Natural history and habitats within ecosystem 3.0 Historical Overview Historical time line Original mangrove die-off causes Restored characteristics of Clam Bay 4.0 Authorized Construction Activities List of permits and work undertaken to date 5.0 Monitoring Work Summary of annual report results 6.0 Management Objectives Management action/work required, performance criteria and monitoring, responsible entities,timeframe 6.1 Maintain Optimal Hydrographic Environment at Clam Pass (continue monitoring with maintenance work as required) 6.2 Maintain Optimal Hydrographic Environment of Tidal Creeks (continue monitoring with maintenance work as required) 6.3 Maintain Optimal Hydrographic Environment of Interior Channels (continue monitoring with maintenance work as required) 6.4 Maintain stormwater management system, including the berm/mangrove. -r ace : 6.5 Manage and Improve Water Quality(continue monitoring implement Y n,f;me 4 type improvements) �' ss 4,4 6.6 Monitor Ecosystem Communities 6.7 Monitor Mangrove Communities 6.8 Exotic and Nuisance Vegetation Control (address cattails a s '8f 6.9 Continue and Improve Community Awareness and Involveme „dal opportunities, annual meetings, informational/educ• aterc Page 237 of 358 Yv CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 1.0 Introduction The Clam Bay estuarine system is a 570-acre area of sandy beaches, shallow bays, seagrass beds and mangrove forests on the coast of Collier County in southwest Florida. The community of Pelican Bay abuts the northern and eastern edges of the system, while the Seagate and Naples Cay communities abut the southern portion of the system. The Clam Bay estuarine system is an important natural and recreational resource for local residents and visitors. This plan, in addition to providing a brief history of activities undertaken within this system, outlines management goals, objectives and methods to achieve optimal functioning of the delicate mangrove system. Drawing on an earlier plan (The Clam Bay Restoration and Management Plan prepared by the firm of Wilson Miller Barton & Peek, CBRMP 1998), and the findings of nine years of monitoring activities within the system, this plan outlines the goals for future enhancements to, and maintenance of,the mangrove ecosystem throughout Clam Bay. The Clam Bay Restoration and Management Plan, 1998 In 1992 a small area of dead black mangroves was first observed in the northern part of the system. In 1995 a significant area (approximately 50 acres) of dead and dying mangroves was reported (Turrell, 1996). Following the die-off, restorative dredging was proposed to increase tidal flushing by opening up the pass and widening several tidal creeks within the system. The CBRMP was prepared in conjunction with State and Federal environmental permits to carry out the work, and consequently focused on management objectives which were proposed at that time, namely; • Deepening and Maintaining Clam Pass • Dredging portions of the interior tidal creeks to improve flushing capacity • Studying the potential for improvements in upland stormwater/freshwater management • Installation of flushing culverts under Seagate Drive The Clam Bay Mangrove Management Plan, 2008 The Clam Bay Mangrove Management Plan (CBMMP, 2008) combines the c• zh , ve outline and background provided in the original plan with lessons learned over ear implementation period. The goals of this Plan will be to direct the ma ageme sties undertaken to enhance the mangrove habitats in a manner that maintains but he overall integrity of the Clam Bay ecosystem. Namely, the activities unde e'Ian will: • Maintain hydrology and efficient tidal flushing through. • Continue the restoration progress of the mangrove stre am . ; • Enhance and maintain the viability and integrity o . a ecosystem; 2 Page 238 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 • Maintain the stormwater discharge and surface water management necessary to support the Pelican Bay community; • Maintain a review process to determine, where feasible and/or practicable, whether management activities in support of the ecosystem can or should be implemented; • Maintain the recreational and aesthetic values inherent in the system; • Continue to educate and inform residents and visitors about the importance of the ecosystem. Personnel/consultants responsible This CBMMP has been prepared by the firm of Turrell, Hall & Associates, Inc., who, as project managers for the restorative dredging and associated monitoring work has a long history with the project and ecosystem. Input and monitoring data has been incorporated from coastal engineers, Humiston & Moore, Inc. and restoration consultants Robin Lewis & Associates Inc, as well as other interested stakeholders such as the Mangrove Action group, the Seagate Community, and the City of Naples. The ongoing support and assistance of the PBSD and Collier County is gratefully acknowledged. Pelican Bay Services Division Turrell, Hall &Associates Coleman Connell—Chairman Tim Hall—Project Manager 801 Laurel Oak Drive, Suite 605 3584 Exchange Ave Naples, FL 34108 Naples,Fl 34104 (239) 597-1749 (239) 643-0166 Lewis Environmental Services Humiston & Moore Engineers Robin Lewis—Project Manager Ken Humiston—Project Manager 23797 NE 189th Street 5679 Strand Court Salt Springs, FL 32134 Naples, FL 34110 (352) 546-4842 (239) 594-2021 Pelican Bay Services Division In order for the management of Clam Bay to be successful and the mangrove conditio red Itp il to fully recovered status, coordination between a myriad of local, state, and federal w ie > ,d concerned citizen's groups is required. The Pelican Bay Services Division (PBSD) � undertaken that role for the past ten years. The PBSD is a dependent special district known as the Pelican Bay Munici , g and Benefit Unit. It was formed pursuant to Chapter 125 of the Florida Statu formally enabled by the Collier County Commission pursuant to O n :s 90-111 and 91-22. This MSTBU was created to, among other things,prove aint, ce of conservation and preserve areas within Pelican Bay. This resp undertaken diligently for the past ten years under the previous Manage 1e t ` " . is insistent with the goals and objectives proposed under this Management ,T y 3 Page 239 of 358 °� CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 As a dependent special district,the PBSD is an arm of local county government and as such does not enjoy the ability to make decisions concerning the implementation of the Management Plan independent of the desires of the Collier County Commission. The PBSD budget, and therefore its ability to undertake work projects, is controlled by the Collier County Commission. In practical application,this has not proved problematic, as the Commission has routinely approved the mangrove management undertakings of the PBSD and the Commission has authorized this permit application and Management Plan. The PBSD implements County policy within the confined geography of the Pelican Bay community and the defined responsibilities of the PBSD. The PBSD sets it own budget and agenda and routinely submits same to the Collier County Commission for approval. The actual workings of the relationship suggest therefore,that the PBSD has experienced a significant degree of practical autonomy and that this is expected to continue in regards to the implementation of this Management Plan. The result is that the PBSD will be the official manager of this Management Plan with delegated authority to be implemented consistent with Ordinances 90-111 and 91-22 of Collier County. The PBSD will direct this Management Plan and have the responsibility for its implementation and operation over time. As such,the PBSD will plan and implement defined management activities whose purpose will be to protect, enhance and maintain the mangrove community and ecological integrity of the Clam Bay estuary. The PBSD has several attributes which already make it a logical guiding force in the management of Clam Bay. The PBSD: • Is located within the Clam Bay drainage basin; • Has an advisory board(appointed by the County Commission)made up of residential, and business members within Pelican Bay; • Garners fiscal support collected from local benefit assessments; • Is accessible by the public due to its local governing board and advertised public monthly meetings; • Has demonstrated a long-term commitment to the resource and its preservation and enhancement over the past ten years. These attributes give PBSD the knowledge and expertise in matters of local concern and, particular,the problems, opportunities and interests of local residents as they relate to to am Bay ecosystem. Its relationship by operation of law to the County Commission give additional level of access to technical expertise and oversight that is necessary to as " e Management Plan, as contemplated in this document, is fully implemented in e fiel• As part of its responsibilities, the PBSD will assemble and distribute variou * s and assessments as required under the Management Plan, as well as coordina j her public and private groups interested in Clam Bay. The PBSD is or r:7:. for esigned to maintain both its knowledge of the Clam Bay resources and to • . ic s iort for the same. PBSD will insure that the general public, residents in P consultants, and representatives from government agencies with jurisdictio. • ay e:`ch have on-going involvement and input into the Management Plan as ap 4 Page 240 of 358 VIr , I CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 2.0 Clam Bay Location and Setting Maps, description of Pelican Bay and the estuary system Clam Bay was designated a Natural Resource Protection Area by the Board of County Commissioners of Collier County in 1994 (Collier County, 1994) and consists of approximately 420 acres of mangroves and some 115 acres of shallow, open water bays, as well as a 35 acre beachfront parcel (Clam Pass Beach Park). The system consists of three primary bays; Outer Clam Bay (southernmost), Inner Clam Bay (central), and Upper Clam Bay (northernmost), connected by a series of tidal creeks. immeoloom '' . w _ _ i r c * •c " ,x s v ', :7-, ..6:,1 . d 'x #t; * ` 1: • ,i, }d `05 a '41,4, 4 iR4r s4'.s.•..4% rt * t: ' "' µ4b �* i-jh' # t " _-t E1 4is G,,-..._ - ' .' „‘ .. 4114.; f The entire system receives runoff from adjacent upland and wetland areas. Upper Clam ' ek connected to Inner Clam Bay by a winding narrow creek. Inner Clam Bay is connecte am Pass through another narrow creek. Outer Clam Bay is connected to the Gulf of M- o a wider creek through Clam Pass. Some water also flows south to Doctor's pass thr, he culverts under Seagate Drive. Clam Bay Vital Statistics Total acres: Approx. 570 acres Beaches: Approx. 3 miles Mangrove: Approx. 420 acres Open Water: Approx. 115 acres Latitude and Longitude of Pass:N 26° 13' 11",W 81°49' 01" Section, Township, Range: Sec. 32 & 33, Twp 48S,Rng 25E, & Sec. 4, 5, 8, & 9,Twp 49S, Rng 25E 5 Page 241 of 358 lir CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 Clam Pass is a small, marginally stable inlet that has migrated north and south along the shore over the years. Prior to dredging, average water depths were -2.5' to -1.0' with a width of 30-50' (Collier County, 1994). The Pass remains the primary source of tidal exchange for the Clam Bay system, but it is restricted by sediment deposits just inside the pass and in the long meandering tidal creeks surrounded by mangrove forests. The smaller embayments located primarily to the north of the pass are not subject to normal tidal exchange except during exceptionally high tides. Tidal range is restricted throughout the Clam Bay system (Turrell 1995; Collier County Report 1996; Tackney 1996). Tide gauges are installed and monitored on the County boardwalk at the north end of Outer Clam Bay, the north and south Pelican Bay boardwalks, and in Upper Clam Bay. These gauges indicate that the dredging done at the pass and in the interior creeks has drastically improve the tidal exchange throughout the system. Tidal ranges vary from 2 feet out in the Gulf to 1.5 feet in the southern portion of the system down to about 0.5 feet at the northern end of the system. South of Clam Pass, a channel oriented north-south with water depths varying between -1.0' to - 4.0' leads to Outer Clam Bay (approx. 72 acres), itself connecting to the Venetian lagoon system via a couple of concrete culverts under Seagate Drive. There are also three dead end canals off the south end of Outer Clam Bay that are associated with the Seagate community. North of Clam Pass, a long narrow (approximately 6,600') tributary leads to Inner Clam Bay (approx. 32 acres). Evidence in the literature suggests that oyster bars were once present in this channel (Humm and Rehm, 1972). A further, narrow creek(5,400') leads north from Inner Clam Bay to the smallest and most isolated; Upper Clam Bay (approx. 20 acres). Historical aerials and anecdotal recollections from long-time County residents note a connection of the system at Upper Clam Bay to Vanderbilt Lagoon and Wiggins Pass to the north via a small creek (Collier County, 1994, Tropical BioIndustries, 1978). This connection was eventually severed with the development of Vanderbilt Beach Road in the 1950s. The system is bounded on the north by Vanderbilt Beach Road, to the south by Seagate Drive, the east by the Pelican Bay development and to the west by the Gulf of Mexico. Pelican Bay is predominately a residential community of private single-family homes, e 1 as both high and low-rise condominium units. The community also includes a golf course,;, o ► • on areas with meeting rooms, tennis courts, beach park facilities, emergency services faci„; ' .nd commercial areas with shopping and hotels. The 2,104-acre Planned Unit Developm•; '•UD) was approved in 1977 as a partnership between Collier Enterprises and West` se Communities. It was one of the first developments in Florida required to save fragi .stal wetlands and associated ecosystems (Urban Land Institute, 1981). The dev lopme elican Bay had a limited impact on the wetlands themselves (approximated 944acre in total with about 78 of those acres located in the northwestern corner of the prop- eaving the mangrove forest intact and preserved around the bays. As mitigation for these •• pacts, the 35 acre beach park was donated to Collier County. 6 4Z° Page 242 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 1 ,,,:„.,,_,...,_ , ,...„3,,,,A v.I fj," i ,, ,„.; ,1.'.::.; s Is, t Is 1 5er .yrtiM'r..'F, Wes' t � Approximate extent of Clam Bay Estuary system. Development landward of the mangroves required a stormwater management syste ed to spread runoff along the eastern edge of the Clam Bay estuary (Collier County-Report ,� A four to six foot high and 2 %2 mile long berm separates the developed portion of Pelican Bay from the estuary lying to the west of the development, but numerous culverts through the berm discharge water to a swale system along the eastern perimeter of Cl. ' .y. The eastern edge of Pelican Bay is about 12-14 feet above sea level at US 41, slo.' east- .., t direction to about 2 feet near the berm. Six drainage basins operate o • • slowly move surface water into the receiving area of Clam Bay. 7 4;'° Page 243 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 164VN 6 Approximate locations of Drainage Basins within the Pelican Bay Development(photo is oriented with east up and north to the left). 8 111111,4‘ Page 244 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15,2008 Natural History Prior to development, the entire coastline of south Florida would have resembled the Clam Bay system with meandering mangrove lined waterways buffering sandy barrier islands and terrestrial communities. Unique within the moderately developed coastal community of Collier County, Clam Bay is a valuable resource for wildlife (particularly juvenile marine species and birds) as well as residents and visitors to the area who enjoy the recreational opportunities the system offers such as kayaking, fishing,walking,bird watching,beach going, and others. The system is a mixture of mangrove-lined tidal creeks, mangrove forests, shallow bays and tidal passes, seagrass beds, tidal flats, sandy beaches and brackish interior wetlands. A man-made water management berm now divides natural and developed portions where historically mangrove forest would have transitioned gradually into the mesic coastal hammocks and upland pine scrubs that made up the now developed portions of the Pelican Bay community. A brief overview of these important habitat types, their key characteristics and value is provided for reference below. Mangroves Mangroves are salt tolerant trees that grow in tidal areas of the tropics and are legally protected for their ecological value,with such functions as; • Providing habitat for marine and terrestrial wildlife. • Protecting coastal areas from storm surges and coastal erosion. • Acting as a natural filter for land based freshwater run-off. • Forming the basis of an incredibly productive estuarine food chain which includes many commercially valuable species. Three species are common in Florida as far north as Cedar Key and St. Augustine, where cold winter temperatures limit their range. All have special biological adaptations to cope with s and unstable, mucky, low oxygen soils that result in a tidal, hence continually waterlo environment. The dominance of mangroves in tidal areas is a function of these adaptati• hence their ability to out-compete other wetland plants. Red mangroves (Rhizophora mangle) are recognized by their tangle of reddish .rop roots, long cigar shaped seedlings (the propagules which can be seen in the s mer and their large, pointed evergreen leaves. They are typically the most seaward'of t - hre- 'es with the prop roots and vertical drop roots providing support, small pores on t '' alled lenticels allow oxygen exchange via air as the waterlogged soils beco e oxygen depleted. Salt is excluded from the plants cells through a process cafd ultra- tration in the roots. The characteristic propagules germinate on the parent tree and drop and at for up to a year, finally becoming heavier at one end so that when encountering a suitable substrate they are ready to root upright. Good tidal flushing is essential for healthy development of red mangroves, to prevent the build up of toxic metabolic waste prod cts in the mangrove soils. The mass of 9 Page 245 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15,2008 prop and drop roots forms extensive surface area under water for attachment of sessile, filter feeding marine species (such as sponges, tunicates and mollusks) as well as hiding places for juvenile fish. Birds, butterflies, insects and mammals find home and food within the canopy. Fall and breakdown of Red mangrove leaves is the start of productive estuarine food webs. Black mangroves (Avicennia germinans) are typically found slightly further inland and key identification features include the snorkel like pneumaptophores which radiate upwards out of the soil from the base of the trunk, a grey-black rough bark and slightly pointed, oval leaves which are silvery with salt deposits on the undersides. The pneumatophores play an important role in oxygen exchange and unlike the Red mangroves, which keep salt, out of body cells, the Black mangrove excretes salt onto the backside of the leaves. They are also reliant on adequate tidal exchange but lack the supporting prop roots that typify the Red mangrove. Small white flowers and small lima bean shaped propagules are apparent during the summer months and, on falling from the parent tree, float for a short period and establish in the mucky soil. Often, (although zonations described are typical and frequently vary) found further inland again is the White mangrove (Laguncularia racemosa). Occurring in drier areas they do not exhibit the adaptations to soft, anaerobic soil of the other species. The bark is characteristically grooved and furrowed and leaves are oval, mid-green and leathery with two small glands on the petiole at the base of each leaf which are responsible for salt excretion. White mangroves also flower in the spring and early summer and the small seedlings have the shortest floating dispersal stage of the three species. The Buttonwood (Conocarpus erectus), which is considered a mangrove associate, occurs further inland still than the White mangrove. Small, round, brown seeds give rise to the name and it is a hardy species, able to withstand the full sun, high temperatures and salty conditions of coastal Florida. These characteristics also make it an excellent and attractive landscaping plant. Creeks On the seaward edges of small islands and the tidal creeks, passes and estuarine waterways th make up the Clam Bay system, a fringe of Red mangroves will be found growing up to 25 fe height. This zone can be just one or two trees in depth or extend landward for some di depending on topography. The habitat provided by the prop roots of red mangroves ' eat importance to many fish and tidal creeks are popular fishing spots. Forests Much of Clam Bay is comprised of low-lying basin forests and the domina s e ack mangrove. Tides inundate these areas via small surface waterways. Sub ) .rces of water are also important. Tidal flushing allows nutrients to be dis d w x ``` e forest and provides for the transportation of dead leaves, twigs, etc. As material decays, it becomes food for marine life. It is this mangrove detritus which is c d b many organisms at the base of the food chain and which in turn create the next lev& .of t e chain necessary to support the fish populations that characterize the m. munity. Associated plants 10 Page 246 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15,2008 include the succulent groundcovers Saltwort (Batis maritime), Glasswort (Salicornia cervicornis), (especially where a fallen tree provides a break in the canopy and light penetration to the forest floor) and, further inland and closer to freshwater sources, the Leather fern (Acrostrichum danaefolia). Tidal Passes The Clam Bay system was originally part of a larger tidal system connected to the Gulf of Mexico by three tidal inlets; Wiggins Pass, Clam Pass and Doctors Pass. During the 1950's and 60's this system was isolated from adjacent bays by the construction of Seagate Drive to the south and the construction of Vanderbilt Beach Road to the north. The practical effect was to leave Clam Pass as Clam Bay's only connection to the Gulf. The exchange of seawater between Clam Bay and the Gulf is critical to the ability of the mangrove forest to export organic matter, as well as excess salt and freshwater. It also supplies oxygen rich water and nutrients from the Gulf. The greater the tidal amplitude (or tidal prism) the greater the benefit to the mangroves — more needed resources are delivered and more wastes are removed. Conversely, in the absence of surface water circulation or tidal activity, mangroves slowly die due to deleterious changes in the sediment: 1) in the absence of oxygenated water, the sediments become anaerobic or anoxic, and 2) metabolic wastes and hydrogen sulfide accumulate in the anoxic sediment (CBRMP, 1998). Tides in the Gulf of Mexico are mixed, with the norm being two high tides and two low tides experienced per day and normal amplitude (range) of approximately 2 feet. The highest tides (springs) are experienced twice per lunar month at full and new moons when the gravitational pull on the earth's surface waters is greatest. Neap tides also occur twice per lunar month when the planetary(gravitational) influences of earth,moon and sun are perpendicular. CLAM BAY TIDAL,RANQES 2w O .,H,,,,, III 111asao:asmrtraair II IPo-;e,a+,tue wdKar IllAtAM-hUYa AoVn;+r R? y .� 'OYYk.;.apta...IS k r a . 'f i 11°lkk a' ,.r : , k- 1. Ile 04/011L Exhibit from 2007 Clam Bay Mo • • 111111k 11 Page 247 of 358 i CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 OW* CLAM SAY ., TOE CIAUOF '' L.L.-- .. • tO: 10371 4. — 8: 388540.10 .. * '(7, 494955.60 i .- LAT: 26 14 35.80 .t .'..,,, LIMA et 48 51746 ', , . . . 1...... 4 , I i 13: 1:149137 ;;4 1:::23133 83:16155:;: tA1; 212•t - st \ 4 : * *4 • .• - s MTH BEACH , TX* OAUCt _ :if 10: 10786 4. X; 33076 ,33 Y: 667173.00 . 1.47". '48.`1,1 18.74 ., • . "" L044: ar 48 S8.I3 g r."4.{", q , -g 7.. ,, r Pt CSTRY E404 POWA..< : i . . 0. ""Dr GALAW X. 309314.4, r. 885757.20 LAT: 26 '2 59.75 iir. 4 LOW,: al 48 SILA ,..4*F : .:6 '''''r Ati,. 1 e •\ , ;',1 I ' P., _ 'M 4 ,v.: . *. - *I. -------' '4414:4 Vr,-,',i„,„,:a.':44„,, it.;t , ...„,-- . 's *24•4,32200,24. 44.31. :..2:7. .47%, ........444.4. 44441.44.44.4-4+ i.ti 4 . ',- ;Pr-9194,X04 Pii911X,"O. _ ".. {1■ . '''r. . 00.4 4040r414-II- IL ': o'1.4. r ---- .,.1, 1, --,. ; ru- ..w.N.,,,r1,-", f",00/rc4r.2193rfr4THr Nr2C■Xfi.r...4 4. ' IA on: .("A . ,,.- „. •, .„i.. ,,,,..,..„ ‘ - .,.." . 1 it't '44 %N.' 4' '"'''4 4:1 .4 X, "`,. ,ss.„,s' ....- „,...,j,_ 41-4 , iegfP---........?; • _ • Ar 'ir. 3: flUMISTI)N c 0.1 PASS tii 72 SRA= COM 1111 VMC.)01ta ,..„,.,. ..,..,...1011r 044:61 Ltathl101.5 itAFI.X.S, I.... 44110 ENGIN: : 'L14.4*11114V..•`I"1110.H.Mr11111111.111.111111EIMIlili rAX: (239) 594-2925 t•LIRIFrriF71.7,111N138320111 SCALE: ''-- 5.3.3 0.10144.. (230 544 2021 COSUi I "."11:4?" MEVIIIIII• T IP 140N1 11...1RE: A ww of hartislonowctrrmars...:444r Tide Gauge Locations .... 12 Page 248 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 It can be seen that the health of mangrove forests is directly related to the efficiency of the tidal passes. These are dynamic creeks whose location vary annually and, as illustrated by Clam Pass, can periodically close such as has happened at least four times in the last 25 years (Turrell 1995; Tackney 1996). Tidal creeks are passageways for fish and marine invertebrates between the open waters of the Gulf and the protected embayments of Clam Bay. Manatees and turtles may also use the passes. Scouring action of the fast flowing tide generally prevents colonization by seagrasses and other benthic plants and the substrate is typically sand and shell with the finer sediments carried in suspension and deposited just outside the mouth of the pass (the ebb shoal delta) or to the interior of the system on the incoming(flood)tide. Oyster Bars Oysters (Croassostrea americana) are filter-feeding bivalves, which were once common within the tidal creeks of Clam Bay. They can form extensive bars and as such slow water movement and commence the development of small islands. The surface area provided by their convoluted shells provides habitat for many other marine species. Deteriorating conditions related to closure of Clam Pass is thought to have resulted in the disappearance of oyster bars in the system; though some re-occurrence has been observed to the south of the pass in the last few years during seagrass transect monitoring. Oysters have been documented around the perimeter of Outer Clam Bay in the past two years monitoring efforts. Tidal Flats The sand and mudflats that are exposed at low tides are rich feeding grounds for many species of wading birds. These organically rich sediments support a variety of mollusks, worms and invertebrates that scavenge detritus or, in the case of many bivalve mollusks, extend siphons at high tide and filter vast quantities of water. Birds such as a variety of herons, ibis, egrets and spoonbills pick through the sediment for the invertebrate food sources. Seagrass Beds Seagrasses are flowering marine plants of shallow, tropical regions. With a creeping g growth form connected by horizontal rhizomes they serve to trap and anchor sediment. th the grass i blades themselves and the surface area they represent provide food and attachment for marine 1 species and seagrass beds are renowned for their value as nursery habitats. Several areas within the Clam Bay system host seagrass beds, specifically Outer Clam Bay and waterways just inside Clam Pass. Three species are common in t th orida waters; the largest Turtle grass (Thalassia testudinum) with flat strap shape yes, smaller shoal grass (Halodule wrightii) with narrow, flat blades and Man grass Syringadium faliformis) with cylindrical blades. Of these three species only shoal a and,turtle grass are found in Clam Bay. Shoal grass is by far the most common 11 of turtle grass are also 13 Page 249 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 present. Also common in Clam Bay is Paddle grass (Halphila decepiens) which is usually more indicative of brackish water. Paddle grass is much more ephemeral in nature and diligence is required to be able to locate it during the time frames when it is present. Seagrasses rely on good light penetration to enable photosynthesis and are sensitive to reduced tidal water quality. Growing in shallow regions they are also vulnerable to physical damage by boats. A variety of marine algae can be associated with grass species, differing in the lack of a true rooting and vascular system. Several species of both brown and green alga have been observed. Sandy Beach In addition to the 35-acre Clam Pass Beach Park, south of the pass, sandy beach also extends north all the way to Wiggins Pass. Shorebirds feed on marine invertebrates such as coquina clams and mole crabs at the water's edge and beaches are crucially important habitat for nesting sea turtles. Coastal plants colonizing the dunes are key players in trapping windblown sand and preventing coastal erosion as the first defense against heavy winds and surge of tropical storms. Species common on the beaches of the Clam Bay system include; Sea oats (Uniola paniculata), Seagrape (Coccoloba uvifera), Cabbage palm (Sabal palmetto), Buttonwood (Conocarpus erectus) and Railroad vine (Ipomoea pes-caprae). Hardbottom Communities Another important marine habitat associated with the estuarine system is the hard bottom reef community found just seaward of Clam Pass. In about 10-15 feet of water a variety of sponges, stony corals, gorgonians, fish and associated invertebrates can be found within a system of rocks and ledges. Outcroppings of similar habitat type occur along the length of Collier County and are a little known resource of regional significance. Brackish Marsh At the interface between forested mangrove areas and the water management berm depressional areas that have become colonized by aquatic freshwater plants such as (Typha latifolia), Carolina willow (Salix caroliniana), Bulrush (Scirpus cal forte us), Needlerush (Juncus romerianus) and Leather fern (Acrostichum danaeifolium). Wildlife such as otters (Lutra canadiensis), alligators (Alligator mississippiensis), various turtles, and wading birds can be commonly observed. These areas require regular maintenance to preve ` e spread of nuisance and exotic plant species and ensure optimal functioning oft ma nt system. 14 Page 250 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15,2008 3.0 Historical Overview Original land use, development history, die-off and restoration work. To properly understand and successfully implement proposed management objectives, actions and events, which have lead to the current, situation in Clam Bay should be described. This chapter starts off with a time-line to most clearly portray the system in its historical context. It is intended as background information and as a factual recount based on personal experiences and comments, press reports, published and unpublished reports. The chapter finishes with an overview of the mangrove die-off including causes, and the work that has been undertaken so far as part of the last Clam Bay Restoration and Management Plan to restore the system. Time Line 1920 A dirt road is built by Forest Walker running from the north-east to south portion of Pelican Bay, a forerunner of US 41. 1950 With 6,000 residents of Naples, Clam Bay is part of a connected system of barrier islands, mangrove passes and waterways. The orientation of the beaches and passes would have changed seasonally and with storms Late 1950's Vanderbilt Road is constructed severing connection with the Wiggins Pass system to the north. 1958 Seagate Drive is constructed as the Parkshore community is developed. Flow is blocked into Venetian Bay to the south. Vanderbilt Lagoon AL Outer Clam Bay &I 1 r11.11". 41101 Upper Clam Bay _ ' 4 ;4 Venetian Bay Circa 1960 Aerial Photograph Cir e •tograph 15 Page 251 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 1972 Tri-County Engineering produces reports: • An Ecological Study of the Clam Pass Complex is published by Humm&Rehm • Hydrographic Investigation of the Clam Bay System Coral Ridge-Collier Properties,Inc. (a partnership between Westinghouse and Collier Properties) acquired the property and initiated development of Pelican Bay. 1974 Pelican Bay Improvement District is formed to manage common property in Pelican Bay and provide for long term sustainable infrastructure. 1976 Three, bi-directional 24-inch culverts are placed under Seagate Drive to provide hydrologic connection to Venetian Bay. Report"Environmental Assessment for Development Approval" is prepared for Pelican Bay. Clam Pass closed in and then was re-opened by dragline. 1977 Pelican Bay Planned Unit Development is approved and construction commences. 1977-1979 Gee & Jensen Hydrographic Engineers conduct a series of tidal studies within the system and distribute "A hydrographic study of Clam Bay system" in 1978. 1978 Tropical Bio-Industries produce a report: Carbon Flows in portions of the Clam Pass estuarine system. Ecological assessment work by Tropical Bio-Industries for permitting of the north-west f notes a small area of stressed and dead mangroves close to Upper Clam Bay. 1979 Environmental Assessment of the northwest fill area is distributed. Tropical Bio-Industries produce biological reports: • A comparative study of the water and carbon flows of Upper Clam Bay • Invertebrate Population Studies in the vicinity of Upper Clam 1981 Clam Pass closed in was re-opened by dragline. 16 Page 252 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 1982 Clam Pass preserve is dedicated to Collier County. 1983 Tropical Bio-Industries produce biological reports: • Fish populations of tidal ponds west of Upper Clam Bay 1986 Collier County constructs a 2,900' boardwalk to provide access across Outer Clam Bay to the county park, south of Clam Pass. 1988 Clam Pass closes twice, first in the spring and again in the late fall after Tropical Storm Keith (November 23, 1988). 1989 Small areas of stressed and dying mangroves are noted by residents in the basin west of Upper Clam Bay and east of The Strand in Bay Colony. A DNR interdepartmental memo highlights cause of the stress as "the lack of adequate water circulation resulting from the closure of Clam Pass". First emergency dredging permit received from DNR to re-open clogged Clam Pass, following memo by David Crewz to the DNR highlighting problems and danger if the pass was not re- opened. 1990 Pelican Bay Improvement District comes under Collier County as the Pelican Bay Services Division. 1992 The area of dead mangroves is reported at 7 acres. 1994 1°‘ 20 acres of mangroves are reported dead. 1994 Clam Bay is approved by the Board of County Commissioners as Collier County's tural Resource Protection Area(NRPA). 1995 Emergency dredging permit issued allowing opening of the pass, ' wo er back than 600 feet. 17 Page 253 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 1996 Permits to open Clam Pass received from DEP and USACE and work completed in April. In summer and fall blasting and hand excavation was permitted and completed in 1997. 1996 Mangrove die-off area estimated at 50 acres. 1997 Clam Pass dredged again under modification to 1996 Permits. 1998 Ten year permits received from DEP and USACE for dredging Clam Pass and the interior channels and Seagate culverts with associated monitoring work and storm and freshwater studies. 1999 Dredging work associated with the CBRMP is completed in the spring by Ludlum Construction Company. Ellicott Series 370HP Pum.ing Sand out of Clam Pass (1999) o •c I ft 1 � • . fe ;i' t t yam', Wk.Y , 1999 Staff at The Conservancy of Southwest Florida commences a 3-5 year study of mangroves, surface water level and elevation within the mangrove die-off area. 2002 Maintenance dredging of Clam Pass flood shoals completed to improve tidal ,, . . 2004 Hurricane Charley comes ashore about 50 miles north of Clam Pass. A lot of sand was redistributed but the pass did not close. Extensive limb and leaf loss was documented within the mangrove forest. 18 Page 254 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 2005 Hurricane Wilma comes ashore about 30 miles south of Clam Pass. More limb and leaf loss is noted. Pass does not close. • Hurricane damaged mangroves along bay 2005 Same mangroves along bay 2007 2007 Maintenance dredging of Pass and entrance channel completed to 1999 specifications. 1995 Die-off and Related Causes The majority of the original die-off occurred within the northernmost black mangrove areas of the system. Three defined processes of the black mangrove forest are applicable to the Clam Bay ecosystem. These three processes are briefly reviewed here are: Salt balance: Salt is available to the black mangrove forest from a variety of sources,but normal tidal exchange is the most important. Black mangroves can tolerate slightly higher sediment salinity than the other two mangrove species but can be affected adversely by a s accumulation of salt. In a natural setting,toxic accumulation of salt is usually prevent- dilution and leaching due to rainfall and washout on outgoing tides. Accordingly,t• s of dissolved and diluted salt back to the Gulf is critical to the health of the black ma .a Organic matter budget: Like the salt balance,the organic matter budget is mh 1 r i-d to the flushing component of the tidal cycle. It is generally recognized that even in theest of circumstances only 60-86%of the decomposing matter generated by a mangrove forest is consumed on site. The balance has to be exported. This export is irt'!''the form of highly fragmented or dissolved organic matter fractions and as such is -• de :- sent upon tidal flushing. 19 Page 255 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15,2008 Water budget: Water enters the Clam Bay system through rainfall, freshwater run-off and through the influx of seawater. It leaves via evaporation from water surfaces,transpiration from leaves and tidal out-flow to the Gulf. Since evapotranspiration rates within mangrove forests are relatively low it follows that the forest must freely drain or else water logging occurs that quickly leads to stress and mortality. Rainfall in South Florida contributes about 53 plus inches of water per year and most of that occurs in the wet season. Additional freshwater inputs to this system occur from groundwater flow and from irrigation in the developed portions of Pelican Bay. The irrigation amounts to about 26 to 28 inches(on average)of rainfall every year but can vary widely due to weather conditions. In a perfect world this irrigation component would be entirely taken up by the soil and plants but in these non-perfect conditions, it is expected that some run-off is also generated due to the irrigation. When this amount is added to normal rainfall,the export capacity of the system to the Gulf becomes critical, especially when considered in the context of the need to transport the organic matter and salt described above. The combination of these mangrove species and other intertidal vegetation makes mangrove forests extremely productive natural resources, but their productivity depends on the right combination of tidal "flushing" (movement of water and suspended material in and out of the estuarine wetland) and freshwater run-off to maintain their ability to function. The freshwater input dilutes the high salinity of marine waters,thereby reducing the effort needed by the mangrove to exclude or excrete salt. This allows more of the trees' energy to be directed to normal growth and maintenance. Tidal flushing also allows nutrients to be distributed within the forest and provides for the transportation of dead leaves,twigs, etc. As these materials decay,they become food for marine life. It is this mangrove detritus which is consumed by the many organisms at the base of the food chain and which in turn create the next level of the food chain necessary to support the fish populations that characterize the mangrove community. It is the combined interaction of fresh and salt water through tidal flushing that is critical to the ability of the mangrove forest to sustain itself. It follows therefore,that anything that materially disrupts the maintenance of the flushin component threatens the long term viability of the mangrove forest itself. According to detailed field surveys performed in the early 1970's (Tropical BioIndustri Company and Gee and Jenson 1978)tree densities ranged from 726 to 7,580 per acr maximum canopy height was 39 feet. Within the black mangrove dominated basin 16%of the trees or 8.8 acres of dead black mangroves were reported in the 1978 doc Dead and stressed mangroves were again reported for Clam Bay in 1989 when David W Crewz, a biologist with the Florida Marine Research Institute,was asked to ispect Clam'° Pass Park by Mary Ellen Hawkins,then a Collier County representaf $ the'legislature (letter to Don Duden dated April 3, 1989). Mr. Crewz concluded t the "dead and stressed mangroves were caused by lack of adequate water circulation ing from the closure of Clam Pass.... allowing toxin and salt buildup." 20 'IN/- Page 256 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 Westinghouse Consultants, Inc., employees in February 1992 noted additional mangrove die-offs, north of Clam Pass Park on the west side of Upper Clam Bay. This area was inspected by Dr. Eric Heald, a consultant to WCI, and reported to WCI in April 1992, as probably due to hypersalinity, although 1991 was an above average rainfall year. The same conclusion was reached by Robin Lewis of Lewis Environmental Services, Inc., after an inspection in May 1994. At this time the die-off area was approximately 6 acres. A widespread mortality of mangroves in Florida Bay was also reported in the summer of 1991 (Yarbro et al. 1994) and it was attributed, in part,to natural drought conditions and unusual tidal inundation patterns. After above average rainfall in the summer of 1995, The Conservancy, Inc.'s staff and residents in Pelican Bay reported additional mangrove deaths which continued through 1995 and 1996. The total area of the die-off through July 1999 was around 50 acres. The death of trees occurred around hyper saline ponds and is consistent with conditions caused by periods of excessive inundation of freshwater followed by periods of continuous dry down, particularly where the mechanism for flushing is impaired. (Lugo 1976). During the period immediately preceding the observed die off, and during the periods following, Clam Bay received record amounts of rainfall. This rainfall,when coupled with an admittedly impaired circulation system and intermittent pass closure, resulted in water levels that were high enough for a long enough period of time to adversely impact the mangroves. It should be noted, however,that the death of trees around hyper saline ponds is a process that is now occurring for a variety of reasons elsewhere in Florida and the Caribbean and is not necessarily evidence that the forest is in a state of irretrievable decline. The presence of new seedlings confirms that these conditions may well be able to return. (Lugo 1976;). Presently the die-off areas appear to be recovering as a result of the restoration work done to date. The remedial efforts described later in this Plan, in particular the dredging of Clam Pass and the opening of several of the impacted tidal creeks, have had the desired effect of improving the circulation of tidal waters within the system. (Humiston, pers. comm. 2007). Hydrology The most critical factor for mangrove maintenance is the hydrological regime, sometimA referred to as the surface water or surficial hydrology. This is because the surficial o• v has both horizontal and vertical components and provides key ecological functions mangrove forest. With respect to the horizontal component, incoming water(both tidal and s►� n+ff) into a mangrove wetland brings with it nutrients, dissolved oxygen, and mart { alt y2k� concentrations. Conversely,the outgoing water leaving a mangrov a� a nd '` _ tidal exchange)removes metabolic waste products (e.g., carbon dioxi• ic su s) and excess salt. The vertical component refers to incoming water that per e sediment and root zone, and the sediment drainage, on a falling tide,whic 24; e abolic wastes and excess salt. Page 257 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 It is the inflow and outflow of sea water that is critical to the ability of the mangrove forest to manage these two ecological functions and as such dissipate salts, organic matter and freshwater. It follows that anything that affects the system and alters the ability of the system to perform these functions,will, in most instances, cause stress to the system and, at some point in time, result in the death of the system, or portions of it. The Clam Bay system was originally part of a larger tidal system connected to the Gulf of Mexico by three tidal inlets; Wiggins Pass, Clam Pass and Doctors Pass. (Turrell 1996). During the early 1950's this system was isolated form adjacent bays by the construction of Seagate Drive to the south and the construction of Vanderbilt Beach Road to the north. The practical effect was to leave Clam Pass as Clam Bay's only connection to the Gulf. In 1976 culverts were placed under Seagate Drive to provide some exchange from Venetian Bay (a residential sea wall bay system) and improve water quality in the Doctors Pass area. One-way valves were placed on the pipes in 1999 but there was not enough head differential to operate the valves and they ended up acting as plugs instead. In October, 2002 these valves were removed to promote more flushing and water exchange in this southern portion of the system. Hydrologic studies indicate that the tidal flushing capacity of Clam Bay prior to the restoration dredging was limited and almost insignificant in Upper Clam Bay. The preliminary hydrographic assessment of the Clam Bay system prepared by Tackney & Associates, Inc. (August 1996) demonstrated rather dramatically that there was a significant reduction in tidal range between the middle boardwalk and Inner Clam Bay. Tackney described the flow in that area as"measurably reduced" and"very inefficient". This connecting tidal creek is the key conduit for tidal input and outflow to the northern reaches of the Clam Bay system. And its constriction and the ancillary constriction of tributaries connection to it, impact the quantity and quality of the flushing that can occur in Inner and Upper Clam Bay. As noted earlier, it is the daily rise and fall of the tide and the exchange of seawater between Clam Bay and the Gulf that are critical to the ability of the mangrove forest to export both organic matter, and excess salt and freshwater as well as receive oxygen rich water and nutrie z The greater the tidal amplitude (or tidal prism)the greater the benefit to the mangroves— needed resources are delivered and more wastes are removed. Conversely, in the absen. s surface water circulation or tidal activity, mangroves can become stressed and, in ce instances, rapidly die due to deleterious changes in the sediment or water levels. ` k consequence is that the root systems wither and eventually the whole tree dies. Note tidal exchange mechanism that is critical to the health of the mangrove fore ithi ecosystem, seriously constrained. (Turrell 1995). Another key aspect of th , = •r• •gy is the vertical location of the water level elevation relative to the mangrove s‘-' , ,..tion. Specifically,the mean low water(tide) elevation has to be sufficie er t = mangrove sediment elevation in order for mangrove sediments to drain dur. • �e intent high surface water elevation stops sediment drainage and results in d the accumulation of toxic waste products. 22 Page 258 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 It should be observed that the black mangrove forest does not require the kind of intense flushing that is more typical of the red mangrove systems in order to maximize its productivity. However, the total absence of meaningful exchange was certainly a contributor to the significant degradation of the mangrove system within Clam Bay. (Tackney 1996; Lewis pers. comm. 2008). In this context Tackney observed that even in the absence of rainfall,the average water surface elevations for the inner and upper bays were higher than the average surface elevation for the Gulf. Analysis of the tidal data indicated that average water surface elevations in the Inner and Upper Clam Bays were both elevated above the average Gulf water surface elevation by approximately 0.2 feet. This indicated that the tidal range in Inner and Upper Clam Bays was muted and that the system was receiving significant additional water through runoff and restricted capacity to drain additional inflow. In fact, during portions of the Tackney study no tidal fluctuation was noted in the Upper Clam Bay and only marginal tidal effects were observed in Inner Clam Bay. The reduced tidal ranges were also accompanied by relatively large phase lags. The phase lag is the average time delay measured in hours and minutes between the occurrence of slack(high or low)water in the Gulf of Mexico and the measurement stations. It is affected by both the distance between measurement stations and the amount and quality of hydraulic resistance of the connecting channel. The longer the distance and the higher the resistance, the more pronounced one would expect the phase lag to be. In the upper bays, high and low waters generally occurred over three hours later than the Gulf tides. These conditions indicate that the tidal creeks connecting the interior bays are hydraulically very inefficient. As a result, the upper bays are prone towards extended periods of flooding as a result of freshwater runoff and the inability of the system to drain efficiently. During Tackney's field studies of May 1996, rainfall of approximately 4 inches in three days was adequate to flood the Upper Clam Bay above high tide levels and sustain this flooded condition for over two days. Accordingly, he concluded that the creeks and bays that serve to connect the Inner and Upper Bays were significantly less efficient in the ebb tide stage than they were in the flood stage. Studies undertaken by both Lewis Environmental Services, Inc. and Turrell & Associates, In would support this conclusion. (Turrell 1995). Finally, an additional attribute of the system that is directly related to tidal prism and •u 7,tity of inflow and outflow is the question of inlet stability. Inlet stability refers to a tid. capacity to adequately scour out deposited sediments and prevent inlet closure. For aka=,£ wave environment, inlet stability is governed primarily by the volume of water(ti• ) c. wy the inlet. To remain stable, an inlet must have the characteristic that a temp ti• in cross sectional area produces an increase in current velocities adequate to c constriction. To function without mechanical intervention, the syst- st gsufficient volume off water on the ebb tide to scour out the inlet naturally, • ° _ the ill, over time, continue to close. This is particularly true during period •ity and low tidal ranges. (Turrell 1995; Tackney 1996). The five closures o at have occurred 23 f� Page 259 of 358 ,,.; CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 in the past twenty-five years indicate that stability of Clam Pass is marginal. (Turrell 1995; Tackney 1996). Freshwater Component Under predevelopment conditions, much of the area's rainfall was held on the surface of the land in sloughs and other low areas. This water would either slowly filter through the soil to recharge the shallow aquifer or move through the mangrove community to the bay. Less than ten inches of the approximately 53 inch average rainfall is estimated to have been lost from the uplands east of Clam Bay as surface runoff. The storage capabilities of the land thus moderated surface flows,preventing extremely high flow rates during the rainy season and serving to maintain surface flow and groundwater flow during the dry season. (FDER 1981). In 1977 the Pelican Bay Planned Unit Development was established by Westinghouse Communities, Inc. The development contains a mixture of residential, retail, commercial and recreational facilities and lies east of Clam Bay. Asa condition of development, Clam Bay,the area that lies west of the Pelican Bay and consists of approximately 530 acres of mixed mangrove forest and wetlands was designated as the Pelican Bay Conservation Area. As such, it was designated for conservation but with limited recreational access. This area was eventually given to Collier County and is currently classified as a Natural Resource Protection Area (NRPA). The development of Pelican Bay had limited fill impact to the Clam Bay system, but it did modify the pattern of freshwater entering the Clam Bay system. (Wilson, Miller et.al. 1996). The stormwater management system as designed, permitted and implemented at Pelican Bay employs a series of detention ponds, swales and culverts to regulate the discharge of run-off into Clam Bay. Discharge occurs almost continuously along the eastern perimeter of the conservation area. Run-off from the northern end of Pelican Bay is collected and discharged into Upper Clam Bay. Irrigation water for 2.7 holes of golf and landscaping in Pelican Bay is approximately 3.0 MGD which approximates 26 inches per year of additional rainfall equivalent, (Wilson, Miller et.al., 1996). When added to the average rainfall for South Florida of approximately 53 inches per year,the local area has an effective rainfall of approximately 80 inches plus annually. This is significant, particularly when viewed in the context of predicta storm events that have the potential for altering the amount of average rainfall entering the Bay system. The "Pelican Bay Water Management System-Stormwater Detention Volume Budget Analysis" (Wilson, Miller, Barton& Peek, Inc April, 1996) describes the wa management system as being divided into six watersheds or drainage syste fall, including irrigation, reaches the ground and either seeps into the ground or stormwater detention area within each system. The stormwater detention pla , 4y `:ay has a standard, permitted design capacity to hold the first inch of st• ter • a 25-year storm event. The stormwater is detained for flood protection an. i lity ment. Stormwater discharge is controlled by a series of weirs design -development stormwater run-off rate does not exceed pre-development rates •i tly,the system is designed to discharge stormwater in the development p. 'e -44',„.y in the same manner 24 . Page 260 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 that it discharged stormwater prior to development. The stormwater discharge exits the weir system for a final release into Clam Bay. Stormwater runoff from an additional 130 acres of watersheds, outside of Pelican Bay, contributes an additional and significant volume of discharge to Clam Bay. This water represents 7.9% of the total stormwater discharge to Clam Bay. As the area of Pelican Bay to the east has undergone development, it has increased the impervious surface area,with a concomitant increase in surface runoff, which is eventually discharged to Clam Bay. The daily irrigation water volume enhances the saturation of the uplands which reduces their ability to accommodate rainfall volume,thus effectively increasing surface and groundwater discharge. Groundwater discharge can be commonly observed throughout-the eastern side of Clam Bay and is discernable as a very slight sheet flow. Where this water encounters a discharge system, even one that is not operating at peek efficiency, such as Outer Clam Bay, excess water is effectively removed from the system. However, in the northern section, sheet flow was not efficiently removed due to lack of flow through the forest. Thus, it accumulated, increasing soil saturation and raising the mean water table elevation, and apparently overwhelming the black mangrove's anaerobic soil/gas exchange mechanisms. Mangroves in these areas became stressed and died. Restored Characteristics of Clam Bay In assessing a variety of alternatives to the restoration of Clam Bay,the original need was not so much to restore the system to a mangrove forest(although that remained the primary goal) as it was to stabilize and restore the system as a thriving natural resource. It was recognized that with changes to naturally induced flushing rates and hydrological regimes the mangroves would likely adjust by altering zonation patterns, species compositions, rates of growth and mortality, etc. (CBRMP 1998). Clam Pass The single most important thing that has been done to restore the health of the Clam Bay syst is to improve the total tidal flushing capacity of the system. (Humiston& Moore 2003; Le 2007; Turrell 2007). As has been discussed earlier,the tides in the upper reaches of Cl 'a were weak and variable. Runoff from rainfall further reduced the interior tidal range " .u i g Tackney's field study,total rainfall of approximately 4 inches in three days was su Upper Clam Bay to such an extent that tidal fluctuation was completely elimina During Hurricane Charlie, storm surge and rainfall far exceeded this 4 inch s d e y Clam Bay was experiencing tidal fluctuations the following day. The resto`` '�� `` • �' � dredging the pass, dredging the interior channels, and construction of the ne . ng cuts throughout the original die-off area proved very effective in m.;= -'ng 1 exchange and drainage capability of the system. 25 PES Page 261 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 In Outer Clam Bay, where the channel leading to Clam Pass is relatively short, the tidal range was only 50%of its potential value. This diminished exchange capacity was a direct result of the constricted nature of the inlet and its adjacent interior channels. During flood tides, sand is carried into the pass by tidal currents and settles out of the water column where the current drops below the magnitude necessary to maintain the sediment in suspension. At Clam Pass this has resulted in the gradual accumulation of sediment in the channels interior to the inlet. This sedimentation process reduces the hydraulic efficiency of the channels and results in diminished tidal ranges for the interior bays. In 1998,when the restoration activities commenced,the channels immediately interior to the pass were so constricted that even when the pass was excavated, the interior tides remained muted. Efforts to maintain the pass in an open condition were dramatically improved by enlarging the dredge area to include not only Clam Pass, but also the critical areas of the adjacent interior channels. This action not only augmented the volume of tidal flow through Clam Pass, but also reduced the likelihood of inlet closure during adverse weather conditions. Currently, Outer Clam Bay's tidal range has been improved by 4 to 6 inches as a result of the dredging activities and the increased self-maintenance capability of the inlet. The single most critical causative factor of the Upper Clam Bay mangrove die off and lack of natural regeneration of mangroves was the relative absence of adequate tidal flushing, or tidal pumping, typically measured in terms of tidal amplitude and its frequency of occurrence (CBRMP 1998, Roessler pers. comm. 2004). Tidal pumping refers to the hydraulic change in water pressure in mangrove sediment that is controlled largely by tidal activity. When rising tides force a rise in the water table in the sediment beneath mangroves, gasses (e.g., carbon dioxide, hydrogen sulfide, methane, ammonia) and various fluid wastes (including refractory and labile dissolved organic matter) are expelled from the sediment. Since some of these compounds are toxic, particularly hydrogen sulfide,their frequent(daily to twice daily) removal is critical to the health of the mangroves. Conversely, on falling ties and a drop in the sediment water table, gases (e.g., oxygen) and nutrients present in the over-lying water are drawn into sediment. The frequent renewal of sediment oxygen is particularly important because it is required in normal root respiration which, if stopped, causes mortality. Thus in the absence of tidal pumping, metabolic wastes accumulate in the sediment and it eventually turns toxic and anoxic, mea no oxygen. It is important to note that this critical process has nothing to do with the s._ , or absence thereof, or with the presence of absence of surface and subsurface water. Because the tidal amplitude was wholly inadequate mainly due to the restricted tidal ;on and tidal pumping within the Clam Bay system, and between the Clam Bay and f of Mexico,the correction provide by the restoration activities has been criti g� f•'and management of conditions required to foster mangrove growth in addition to .,d maintaining water quality within Clam Bay. 26 Page 262 of 358 f . CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 Interior Tidal Creeks It is also important to recognize the interrelationship between the maintenance of Clam Pass and the maintenance of the interior connecting tidal creeks. The tides in the upper reaches of Clam Bay were weak and variable. In the absence of rainfall,the tidal ranges of the Upper and Inner Clam Bay's were on the order of 15%to 19%of the Gulf tidal range. Run-off from rainfall quickly flooded the upper bays and further reduced the interior tidal range. The reduced tidal range in the interior bays were due to the restrictive condition of the interior connecting tidal creeks. (Tackney 1996; CBRMP 1998). These restrictions not only super-elevated the average water surface elevation within the bays but also retarded drainage. The problem was exacerbated by the addition of pulsed water from the stormwater management system, which by design stores water in its detention/retention areas and then allows it to discharge into the bays. The constricted condition of the interior tidal creeks coupled with the additional water being continuously discharged into the bay elevated the water surface elevation in the upper bays and contributed to extending the periods of flooding beyond tolerance levels that mangroves can accommodate, particularly the black mangrove. (Turrell 1995; Tackney 1996; Lewis 2007). The second restorative action of the plan required that three sections of interior tidal creek be dredged open and in some cases enlarged in order to augment the transfer of water. Removing the constrictions present in these waterways allowed the increased inflow of water as well as enhancing the outflow of water. These adjustments enhanced the flood tide ingress and allowed for increased volume to exit on the ebb tide. The results of this work showed an almost doubling of the tidal amplitude in the upper reaches of the system. While the amplitude is still far below the levels seen in the Gulf, it is still much improved from the pre-restoration levels. Interior Flushing Channels The third restorative action of the original plan was the creation of a network of flushing cuts within the mangrove forest and die-off areas. These cuts were dug by hand throughout the system the purpose of which was to connect depressional zones and areas subject to ponding to the main waterways of the system. This allowed for tidal water to flow into and out of the fo areas much easier and further enhanced the tidal exchange that could occur. .; Biological monitoring work over the past ten years has conclusively shown that t, p ved drainage which has been achieved through excavation of these small flushing the forest basin has greatly alleviated ponding and contributed to the observed improve the Clam Bay mangrove community. , ti • 27 Page 263 of 358 41.. CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 4.0 Authorized Construction Activities List of permits for work undertaken to date and relevant legal framework Collier County processed a permit to dredge limited areas of Clam Pass to facilitate the movement of tidal water in and out of Clam Bay. The FDEP permit for this activity was issued on March 28, 1996 with the companion USACOE permit being issued on April 2, 1996. The FDEP permit was modified on April 10, 1996 with the authorized work being undertaken and completed on April 17th, 1996. The practical effect of implementing this Permit was to reopen the Pass, but it was clear that without a more comprehensive strategy, this effort, standing alone, would not revitalize the Clam Bay ecosystem. A permit to improve the channel flow within defined areas of the Clam Bay system by a combination of blasting and hand excavation was issued on June 26, 1996. The work was undertaken and completed in two segments. The first channels were opened in August 1996 and the second channels were opened in November 1996. The results of these two initiatives were positive in that measurable improvements in tidal flow were discernible and with that have come improved conditions for natural revegetation. A permit was issued on January 5, 1997 to construct a portable pump and pipe system as an interim measure to divert freshwater within the Clam Bay system to the Gulf while a more permanent solution contemplated by the construction of an outfall structure was reviewed. Although this plan was never implemented and is no longer considered, it envisioned two pumps that would be operational when the water surface elevation within Clam Bay exceeded a specified threshold. The plan anticipated the direct discharge of excess water into the Gulf with the expectation that this system would augment the natural discharge through the tidal mechanism after severe storm events. Lastly, Collier County authorized the pursuit of a ten-year permit to allow the County, or its . designee (which in this case was the Pelican Bay Services Division),to maintain Clam Pass in open condition. The application, as filed, did not address any other issues affecting operational characteristics of Clam Bay and essentially mirrored the 1996 Permit describe first paragraph above. This permit was issued in 1998 and has been the guiding docum- .• the maintenance activities undertaken in the Clam Pass system since then. Fg. It is anticipated that an updated version of the 1998 permit will be issued and imp :d in conjunction with this revised Management Plan. The permit duration wil : *•rdin th both DEP and the Corps of Engineers but is anticipated to be for a mini ' -- i = (5) years. This permit will allow ongoing maintenance and enhancement activit • ,e along with occasional, modest removal of material by dredging within a . et a �` lam Pass in � =`�ansi order to maintain the existing tidal regime within the system dredging or other new management initiatives will be reviewed and pe : under separate applications. Ongoing investigations being undertaken b th e my Coastal Zone Management office are being developed to look at, a. �- +ems more in-depth water 28 Page 264 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 quality issues associated with waters to the north and south of the system, navigation concerns, expanded dredging outside of the previously approved footprint, and other issues that may arise as a result of stakeholder discussions. This Management Plan is specifically designed to maintain the work and activities already undertaken and to insure that the restoration success observed to date is continued. The following list contains more details related to existing and historical permits issued for the Clam Pass system. Permit Details Department of Environmental Regulation Construction Permit/Certification No.: 11-50-3769 Date of Issue: May 23, 1979 Expiration Date: May 15, 1984 Project Description: To provide construction sites for residential development in a planned community by: placing approximately 700,000 cy of clean upland fill material onto approximately 94 plus acres of submerged lands of waters of the state landward of the line of mean high water. Department of the Army Corps of Engineers Permit No.: 00754929 Date of Issue: November 18, 1981 Expiration Date: November 18, 1984 Project Description: This permitted the filling of 75±acres of mangrove wetlands north, east and west of Upper Clam Bay and south of Vanderbilt Beach Road. Department of Environmental Regulation Modification Permit No.: 11-50-3769 Date of Issue: December 23, 1981 Expiration Date: November 18, 1986 Project Description: This modification extended the expiration date of the permit to November . 18, 1986. Department of the Army Corps of Engineers Permit No 79K-0282 Date of Issue: August 2, 1983 Expiration Date:November 18, 1986 °Y Project Description: This was an extension of the permit authorizing the filling • _ . of mangrove wetlands north, east and west of Upper Clam Bay and south of Vand t each Road, plus approximately 2 acres of mangroves at the existing Collier Co ach at Vanderbilt Beach Road. The request was reviewed and no objection . 57 the proposed work schedule; therefore, the completion date of the permit was years until November 18, 1986. : Department of Environmental Regulation Modification of S „ gement Permit No 11-00065-5 Date of Issue: December 15, 1983 29 Page 265 of 358 e�;u CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 Date of Expiration: Project Description: Approved modifications to 1) Revise system V, drainage area 3. 2) Construction and operation of water management system number VI. Department of Environmental Regulation Permit No.: 86IPT-20328 Date of Issue: December 18, 1986 Expiration Date: December 18, 1991 Project Description: Discharge±2.3 acres of clean fill to construct an access road. Department of Environmental Regulation Modification Permit No.: 11-50-3769 Date of Issue: January 7, 1987 Expiration Date: December 18, 1991 Project Description: This permit modification extended the expiration date and reduced the amount of fill in the area extending south along the coastal edge from approximately 13 acres, as permitted, to 2.43 acres in order to construct a linear access road(for The Strand in Bay Colony). Department of Environmental Protection Permit/Authorization No.:0128463-001-JC Date of Issue: July 06, 1998 Expiration Date: July 06, 2008 Project Description: This application requested a variance from a permit condition which required that a dredge and fill mixing zone be no more than 150 meters in radius from the point of discharge or source of pollution. The applicant requested a mixing zone of up to 1,000 meters for the nearshore disposal of the beach quality material. The project activities are to be conducted to improve the hydrodynamics of, and thus restore and manage, the Clam Bay ecosystem. Department of the Army Corps of Engineers Permit No.:199602789 (IP-CC) Date of Issue: April 1, 1998 Expiration Date: July 08, 2008 Project Description: This Permit authorized the following works: 1) Replacement of Seagate Drive Culverts (pages 44—49 of the CBRMP). 2) Clam Pass main channel dredging for Cuts 2, 3 and 4 (pages 49 — 65 of the CBRMP). 3) Excavation and maintenance of Interior • Creeks (pages 65 —71 of the CBRMP). Department of Environmental Protection Permit Modification DEP Permit No.:01284 "40 C Date of Issue: December 15, 1998 Expiration Date: July 06, 2008 Project Description: This permit modification authorized: 1) an altern • upl. area for Cut #1; 2) an increase in the width of the channel Cut • ass; and 3) alternative pipeline corridors between the dredge cuts and the disposa Department of the Army Corps of Engineers Modification#1 fo z g o.:1 '789 (IP-CC) Date of Issue: February 26, 1999 Expiration Date: July 08, 2008 "tea rev 30 w' Page 266 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 Project Description: This application requested a modification to: 1) discharge the dredge material from Cut #1 to new disposal area identified as an upland parking area; 2) increase the width of channel Cut #4; 3) remove native vegetation and excavate a portion of upland Disposal Site #2; 4) remove native vegetation and excavate a portion of upland Disposal Site #3. Issues 1 & 2 were found to be insignificant and the permit was modified. The requests regarding issues 3 & 4 were not approved at this time. Department of the Army Corps of Engineers Modification#2 for Permit No.:199602789 (IP-CC) Date of Issue: March 08, 1999 Expiration Date: July 08, 2008 Project Description: This application requested a modification to: 1) discharge the dredge material from Cut #1 to new disposal area identified as an upland parking area; 2) increase the width of channel Cut#4; 3) remove native vegetation and excavate a portion of upland Disposal Site #2; 4) remove native vegetation and excavate a portion of upland Disposal Site #3. The proposed modification to widen channel Cut #4 is to be done without any additional seagrass impacts. Based on the review and coordination with FWS, the permit was modified in accordance with these requests. Department of the Army Corps of Engineers Modification#3 for Permit No.:199602789 (IP-CC) Date of Issue: May 05, 2000 Expiration Date: July 08, 2008 Project Description: This application requested modifications to the monitoring and reporting schedule referenced on page 93 (Biological Monitoring) of DA Permit (CBRMP). The request was to submit annual reports instead of semi-annual reports. The permit was modified as requested. Department of the Army Corps of Engineers Permit No.:199602789 (IP-CC)Extension Date of Issue: May 8, 2008 Expiration Date: July 08, 2009 Project Description: This Permit authorized the extension of the expiration date for a period of one year. Department of Environmental Protection Permit/Extension No.:0128463-001-JC Date of Issue: May , 2008 °° Expiration Date: July 06, 2009 Project Description: This modification authorized changes to Special Condition #5 dealing with changes to the informational signage required in the System and extended the expiration date for a period of one year k v s 'pW 31 Page 267 of 358 ° ° CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 5.0 Monitoring Overview 1999-2007 Restoration activities permitted by state and federal agency permits required a suite of monitoring activities to assess effects of the work efforts. Turrell, Hall & Associates, Inc. has carried out biological monitoring of mangroves and benthic habitats throughout the system while Lewis Environmental have focused monitoring efforts on mangroves within the die-off area itself. Humiston and Moore Engineers performed bathymetric assessments of the restored tidal channels and modeled the system in an effort to help analyze future work efforts. Monitoring reports were prepared and submitted according to permit requirements. This section provides a brief re-cap of the work to date to assess both the success of the restoration dredging and consider focus of future monitoring efforts. The following table lists reports by year, consultant and name. Year Date Report Name and Number Turrell, Hall&Associates, Lewis Environmental Humiston &Moore Inc. Services, Inc. Engineers, Inc. N/A Spring 1997 Baseline and Time Zero, #1, pre and post flushing channel construction in the die off area Fall 1997 First Annual, #2, one year post flushing channel construction 1998 Second Annual, #3,two years post flushing channel construction 1 Spring 1999 Time Zero, pre-dredging, #1 Summer 1999 Baseline, post dredging, #2 Results of Mo i Flow, U bered 2 Fall 2000 First Annual, 1 year post Third Annual, #4,post Bathy c ► ,ort# 1 dredge, #3 additional channel construction in 1999 and 2000 3 Fall 2001 Second Annual, 2 years Fourth Annual, #5,post post-dredge#4 additional channel construction in 200 4 Fall 2002 Third Annual, 3 years post- Fifth Annual, #6 B metric Report# 3 (9) dredge #5 post 2001 const 2003 , lam Bay Hydrodynamic w - b Modeling and Analysis 32 Page 268 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15,2008 5 Fall 2003 Fourth Annual, 4 years Sixth Annual,#7,two years Bathymetric Report#4 post-dredge#6 post 2001 construction (10) 6 Fall 2004 Fifth Annual, 5 years post- Seventh Annual, #8,three Bathymetric Report# 5 dredge#7 years post 2001 construction 7 Fall 2005 Sixth Annual, 6 years post- Eighth Annual, #9, four Bathymetric Report# 6 dredge#8 years post 2001 construction 8 Fall 2006 Seventh Annual, 7 years Ninth Annual, #10, five Bathymetric Report# 7 post-dredge#9 years post 2001 construction Summer 2007 2007 Clam Pass Maintenance Dredging Post-Construction Summary 9 Fall 2007 Eighth Annual, 8years Tenth Annual,#11, six Bathymetric Report# 8 post-dredge#10 years post 2001 construction Monitoring required by the DEP permit included: • Turbidity monitoring during dredging work. • Bathymetric survey prior to and following excavation and, subsequently, on each occasion maintenance dredging is carried out.Also following excavation of the interior channels. • Monthly hydrographic (tidal)data collection from at least three (3) sites. • Quarterly water quality analyses from at least six(6) sites. • Biological monitoring to include annual aerial photography, survey of mangrove and seagrass communities through fixed plots and transects. The USACE permit required submittal of semi-annual reports to summarize work completed and planned for the preceding and subsequent six months (respectively) and including monitoring activities. This requirement was later modified to coincide with the submittal of the annual reports per the DEP permit. As shown by the table above, this permit requirement has been satisfactorily fulfille • f the ten years,with reports for 2008 forthcoming at the end of the year Presented in this chapter is a brief annual summary of monitoring results from 1999 to date. The importance of regular, repeatable, surveys of ecosystem health is a crucial part of management efforts. Only by accessing some of the more remote portions of the 570-acre -m c s :ns of stress and degradation be caught. • 33 4; Page 269 of 358 CLAM BAY MANGROVE MENices Pelican Bay Ser T PLAN v Division May 15, 2008 Monitoring Plot Locations a =�� _ 4 }74,, mow. a lip V -w lip, cif �� ri[I i „''. 4lig.1?;4* "i:''' ,7„...;•,, ,4it,... . - ,:', -,: ' .,', r i ,-:- --7- ' li i I li ,...':'.; 1 ,:, 3 Mi ' x3y3,Y-,a°k,.,yF x.#e?va,.,&.,, «� �° ° • �.1/4 € s s, . w 6. v Y .. 0 r 3 c r y. y ,,c R's -As 0 fi �a. t 0 > .Zt €44 ae4� s aw. B z ,,,,s,,,,,., . ,:,,f°:•:A.,,Xt:;,-,, i ttptal ,1,11.;..e., ; , A ° bw Willi f , '1 °‘ 11[100 '';'. U'L '';::!!`"I'‘ '''`'. i. 1 ' • • . •1. 1 a. .. « 10-C.,,;,,, ,,...4,..-..Ili 1 D .t.ti. ,....- on . iii , ...„ ,,.,,..,,,,,,- , . OM :,,,,...Z.4;411:k.' ,` . 34 Page 270 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15,2008 Conclusions and Discussions: Year-by-Year 1999 A total estimate of 42.67 acres dead or stressed mangroves was provided by Turrell, Hall & Associates, Inc. consisting of the main basin area adjacent to The Strand and several, smaller, discrete areas possibly attributed to lightning strikes or where slight depressional areas allow ponding and salinity/oxygen stress. Seagrass acreage is estimated at 5.13 acres, restricted to Outer Clam Bay and the channel leading to Clam Pass. Little change was noted later in the summer at the time-zero survey although most mangrove plots showed significant standing water which could be a function of the dredging work as well as tides and rains around the survey time. Seagrass density was reduced following dredging work. e. M I ter. ..4. ., The main die-off area(NW Clam Bay, adjacent to The Strand) 1999 44411Z°4/1"il" 35 Page 271 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15,2008 2000 A full year after the dredging work, no dramatic changes were apparent, some mangrove plots had declined; others appeared in slightly better health. Seedling recruitment was good throughout. Heavy rains in late 1999 were thought to have contributed to a dieback in groundcover noted by Lewis Environmental Services. No new mangrove die-offs or expansion of stressed areas were noted although the reduction in seagrass density apparent at the time-zero survey continued. Work planned for 2001 included the experimental Riley encasement method for mangrove propagules. Main die-off area 2000 36 4;:° Page 272 of 358 4 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 2001 Mapping of the die-off area was repeated and estimated to have increased in size, spreading to the north,to encompass just under 50 acres. Additionally a few new stressed areas were identified through aerial photographs. Individual plots showed some additional tree losses but consistent seedling recruitment. Channel construction in the main die-off area and close to Plot 7 is thought to have contributed to the recovery process underway, illustrated by extensive Batis and dramatic seedling recruitment. Continued decline in seagrass coverage was reported. The observations generated sufficient concern amongst project managers in 2001 that a suggestion for additional drainage channel construction in the die off area was made. 4,10 -tts- .ki. Main die-off area 2001 k* Y kw z zr' 37 � . Page 273 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 2002 Additional flushing channels were constructed in the die-off area during late 2001 and results from the 2002 surveys show that these efforts were successful with a reduction of 12 acres made in the die-off area. Batis growth and seedling recruitment was good. The problem of exotic vegetation growth in many areas was highlighted and two new diffuse areas of stressed trees were identified. The presence of standing water and bacterial mats suggested lack of flushing was responsible. Seagrasses continue to show decline, attributed to the increased tidal range caused by the dredging work. The one-way culverts installed at Seagate,thought to have reduced tidal exchange in Outer Clam Bay,were removed in October to determine whether tidal exchange between Venetian Lagoon and Outer Clam Bay could be achieved without affecting Clam Pass. Main die-off area 2002 with notable re-growth 4;411411/PI"P 38 Page 274 of 358 =At .111111111111111111111•011111111111M. CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 2003 Stressed areas identified in 2002 were revisited and no changes were noted in 2003. One of the aerially depicted mangrove stress locations was found, upon groundtruthing, to actually be an infestation of exotic plant species. Of significance is a reduction in calculated die-off area to just over 17 acres total with 14 acres in this main die-off region, now classified as recovering. Decline in seagrass coverage is still noted. Water quality testing within the system does not indicate chronic degradation so it is still opined that changes in water levels due to increased tidal ranges is the cause of seagrass declines since initial dredging. Five water level monitors were installed at locations spread throughout the system in January 2003. F 1< Main die-off area 2003 39 Page 275 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 2004 Die-off acreage was estimated at 18 acres total in 2004, with the addition of a new area adjacent to the Contessa condominium building in Bay Colony and several new small lightning strike areas throughout the system. Plot 7 continues to show the most dramatic change of mangrove plots where most exhibit slow change in existing tree number, some losses, some growth and size-class change, but consistent seedling recruitment. Storm events in 2004 (Charlie, Frances, Ivan, and Jeanne) had minimal effects with some leaf loss and limb breakage. Seagrass coverage showed some improvements within channel transects, suggesting that the reduction in flushing that the flap-gate culverts had entailed may have led to the declines seen over past years, though reductions in coverage in the bay east of Clam Pass were observed. Additional flushing channels were constructed during dry season of this year. Water level monitors put in place last year were removed due to repeated equipment failures. #s . or. r e "t f u ' yet`, ' : x , • + 4f-A-1_-4,..t , . ., s 1 ,, t* . 1 F! :S 'f, It. 04 74.t =, W M1Y. lam r ' Ott ''' ' .�� r ; YfF71 M '� 5Cl P x' iiit,A,, rilf 40. 7.? ,4,17.,. .. _ _, ....0,04,,,,,,,". 51t -""' '4. ',71.1,-74..0,7,trAl 7F e _"fe,.t-+ rte . ? I - it ,: Main die-off area 2004 40 Page 276 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15,2008 2005 Several stressed areas were noted as recovering this year including that adjacent to the Contessa building where a drainage channel was in need of maintenance and clearing, work which alleviated the problems. A new die-off area was identified near the County boardwalk and it is suggested that clogging of channels due to Hurricane Charley may be responsible. Total die-off acreage in 2005 is estimated at 24.7 acres. Plot 7 and Plot 8 continue to show significant re-growth. Hurricane Wilma in October of 2005 caused considerable leaf loss, limb breakage and leaf browning throughout Clam Bay although the constructed flushing channels alleviated extensive ponding that could have occurred and the system weathered the storm well. Work completed in 2005 included the last component in flushing channel construction. The decline in sea grass coverage that has been documented since the 1999 dredging work shows signs of stopping with coverage in the channel transects apparent and increased density in the bay east of Clam Pass. 1 Main die-off area 2005 ` ile 1 lb 41 Page 277 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15,2008 2006 Stress damage from the 2005 hurricane season necessitated the need for a division of the classification system currently used to define the status of the mangroves in the system. Stressed mangrove zones are now classified as "die-off area" for mangroves stressed by some factor other than storm events or "area of concern" for mangroves stressed by storm events. It was estimated in 2006 there were 23 acres of recovery, 12.3 acres of stressed areas of concern and 23.4 acres of die-off area present, bringing the total area of stressed mangroves to 74.7 acres. Since the last mangrove channels were dug in 2004 and dredging work continues when needed, most of the monitoring plots have shown improvements and there has been a significant reduction of die-off in the original locale. Future hand- cuts may be required to prevent further stress of storm damaged areas over time. Shoal grass patches are still present in ecologically significant densities within the channel north of the County boardwalk and just inside Clam Pass mouth. Sea grass beds in Outer Clam Bay are still reduced compared to the 1999 pre-dredge conditions, but their steady decline since 1999 did not seem to have continued into 2006. Main die-off area 2006 42 Page 278 of 358 CLAM BAY MANGROVE GEMENT PLAN Pelican MANA Bay Services Division May 15, 2008 2007 The storm damage of 2005 added a level of difficulty to subsequent classification of areas within the system. Extensive defoliation and falling of individual trees meant that areas that could be termed stressed by the flow issues thought to have been responsible for the original die-off in Clam Bay were in fact affected by the high winds and storm surge. Approximately 4.9 acres of formerly classified `die off' have been reclassified to `recovered' this year. Stressed areas of concern that are likely not related to storm damage total about 15 acres while areas of concern that we suspect are due to the storm events have been estimated at about 25 acres. An additional 20 acres within the original die off area has not yet fully recovered and so is also included in this category. A total of 10.6 acres of mangroves are still considered dead, a significant reduction from the original die-off of.over 50 acres in the late 1990's. This brings the total aerial estimate of mangroves that are not at optimum health to about 70 acres. Shoal grass patches are still present at viable and ecologically significant densities within the channel north of the County boardwalk and the bay just inside the mouth of the Pass. Increased densities were also seen in Outer Clam Bay and seagrass coverage is higher than in years past. The gradual decline since the 1999 dredging does not appear to have continued this year, the grass beds have expanded in both number and density. Turtle grass (Thallassia testudinum) was observed back in the system this year in three distinct locations though this may be the result of the increased survey effort. ` Ne t,t ! .a`z Main die-off area lb 43 Page 279 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 6.0 Management Objectives This chapter outlines specific management objectives for Clam Bay; forming the work-plan portion of this Management Plan. As stated in the title of the plan, this is a mangrove maintenance and management plan. The activities and data collection proposed within this section are proposed to maintain the restoration progress observed to date and further the restoration efforts to the point where full recovery of the die-off area has been achieved. Each objective is explained and work items listed along with performance criteria,time-frames and responsible entities. 6.1 Maintain Optimal Hydrographic Environment at Clam Pass The importance and absolute dependence of the system's health on tidal flushing has been demonstrated. Continued monitoring of the bathymetry and tidal characteristics at Clam Pass, the estuary's connection to waters of the Gulf of Mexico, with maintenance dredging as required, is crucial. Work Items: 1. Continue Hydrographic Monitoring Bathymetric data collection will be carried out on an annual basis at stations around Clam Pass. Bathymetric survey information will be analyzed to determine if the cross section of the Pass is sufficient to support tidal exchange necessary for mangrove health. Timeframe: Once per year in the spring or as needed after dredging or storm events. Performance Criteria: Maintain improved tidal flow, improved tidal range, and reduced phase lags. Identify any shoali outside of expected parameters. Responsible Personnel: PBSD Hydrographic Engineers: (Currently Humiston&Moore, Inc.) *** (This information may be collected by the Coastal Zone Management (CZM) o part of further investigations within the system. If so, coordination with CZM will occur and this ation will be shared between the two parties). 44 Page 280 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 2. Analysis and Comparison of Annual Results An annual summary of the collected data will be prepared as a written report with graphical and tabular data presentation. Results will be compared with previous years and with concurrent biological monitoring results. Timeframe: Once per year, fall. Performance Criteria: Completion of a written report. Responsible Personnel: PBSD Hydrographic Engineers: (Currently Humiston&Moore, Inc.) 3. Maintenance Dredging A drastic reduction in the flushing capacity of the system due to shoaling within the pass will trigger a maintenance dredging event. Timeframe: As needed. Performance Criteria: Dredging conducted to remove shoaling and restore improved tidal flows to mirror or better past post- dredging improvements. See enclosed design parameters for cross section standards. Responsible Personnel: PBSD Hydrographic Engineers: (Currently Humiston&Moore, Inc.) *** This activity may be undertaken by the Coastal Zone Management office as part of an ded scope of work but maintaining at least the minimal cross section needed to support the o recovery will be a priority regardless of which office completes the work. 45 114;$11"lif Page 281 of 358 \ a Y� ` , i 1'. _ / ice/ "I AI , 4, +\• �'� I �4► v, b. 3 a ij i `41 ; . \ � .-\ ° + \ I \ \-mss - \ 1 . 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I m I N OA z C)C) D 1 - to ()() C) Z I 3 I -CID z G lT -1 C D ( D N c -11- 0 r m — m � ( __I � o a - I I �o m - En I vlm ; I Nm n k DC) s °- ---j n m NM 1 m m IQ Z 1 - -1 .m. u,_ I •m-1 crl b. 0 I xi O ~' I O £ -„zcn A I * 21.2.0) N — I N 0 I Z r c� o m z N O I N °sr1, m I c' m m C - NNw c O () _ C7 3,---.^: I o 1 x -1 m `'rD 0 'A O --c,-,o Z - Z o_ I Z Ov�AO O I O O , �''-•n I o 1 5 n4-• NOC f - C P,, m 1 N En z C N O N J -I N Ni O O 0 3 47 Page 283 of 358 .", 3 1 43 ' . ,* Of -031 4, Y —39 "mod Y F. t .r r .a t b LE r, orIAL- f CLAM. + �� '.' �i <. SASS AitllMI" .44 ,\ ` ,��u�i a twtru f. 0 4 .,, f BEACH FILL TEMPLATE ' i .1.,;-..,;''';'• (sue NOTE z) ". .". i :k' 'iNr S 1<. � ASR 43 a ' ' _ ±:; CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15,2008 6.2 Maintain Optimal Hydrographic Environment of Tidal Creeks Achieving tidal exchange throughout the system has been shown to be critical to the health of the mangrove forest. Adequate flushing characteristics of the tidal creeks throughout the system must be maintained in order to support the restoration efforts undertaken to date. Dredging carried out in 1999 as part of the CBRMP, was focused on three shallow areas. Revised management goals necessitate observation of the greater system to allow early identification of restricted areas. Work Items: 1. Continue Hydrographic Monitoring Bathymetric surveys will be carried out on a regular basis at the channel locations previously dredged. Other areas may also be surveyed if shoaling or constriction of the waterway is observed that has the potential to adversely impact(restrict) flows through the system Timeframe: Every fifth year(or as needed after a storm event) for the internal channels. Performance Criteria: Cross sectional bathymetry should be maintained at a minimum of the 1999 cross section area to facilitate improved tidal flow and ranges. See enclosed design parameters for cross section standards. Responsible Personnel: PBSD Hydrographic Engineers: (Currently Humiston & Moore, Inc.) 2. Analysis and Comparison of Monitoring Results A summary of the collected data will be prepared as a written report with graphical and tabular data presentation. Results will be compared with previous surveys and with concurrent biological monitoring results. Timeframe: Whenever interior channel bathymetric data is collected Performance Criteria: Inclusion in the annual written report (when collected) Responsible Personnel: PBSD Hydrographic Engineers: (Currently Humiston&Moore,Inc.) 49 Page 285 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 3. Maintenance Dredging A reduction in the flushing capacity of the system will trigger a maintenance dredging event. Timeframe: As needed. Performance Criteria: Restoration of the 1999 cross sectional area. See enclosed design parameters for cross section standards. Responsible Personnel: PBSD Hydrographic Engineers: (Currently Humiston&Moore, Inc.) 4. Mangrove Trimming In addition to the potential for shoaling constricting the waterways, fallen trees and hanging branches also pose a threat to the maintenance of the flushing capacity of these waterways. Keeping the waterways clear and open is important both for optimal tidal exchange as well as for aesthetic and recreational reasons. Areas of excessive overgrowth or clogging by fallen branches and debris will be removed per State (DEP) mangrove trimming guidelines on an as-needed basis. PBSD will notify the project managers who will document pre-trimming conditions and in turn notify DEP prior to any trimming work being done. Post-trimming conditions will also be documented. See enclosed trimming protocol for additional information regarding DEP guidelines. mss• Ott > - i. 1 . Interior channel- mangrove branch trimming_le • • g and access. 50 Page 286 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 Timeframe: As needed. Performance Criteria: Overhanging or broken branches, limbs, and/or roots will be removed to maintain flows through channels and creeks. Responsible Personnel: Pelican Bay Services Division Project Managers: (Currently Turrell, Hall& Associates, Inc.) 51 Page 287 of 358 u w:_ UPPER CLAM BAY ' - .x_ CU' ;SEE FIGURE B-1 FOR DETAIL' l i ) I f . '1 1 ti s ,n c 1 . , F y 4 e�. A • s • i ` w,M i Y ` #, as * f 3 At , z ,,,. --.., ,, .1,..::...\r41.4 *Ir CUT 12 (SE4144c 8 2 FOR DCCAil . § 4 CUT #3 (SIB �fOUFE. B-3 4FOR DE'�11L) �s, 7� I 0 f i y b d ,' . Yw�f►.J fir.. .. .' <f ,t d R M.9 1' CUT #4 ( E f If R C-1 FIB' 'J: aT ,, •�:+-„ REGISTRY , I'. k \ BOARDWALK ' + F.c t` BRIDGE A ,, / . 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'.COASIAI DATE: 05 12 08 FILE:SITEPLAN SCALE: t"=100' PHONE: (239) 5 -2021 %�IOPEPMirTl�cslrN JOB:13078 DATUM:NGVD FIG RE: www•humistonandmoore.com "girl Page 291 of 358 7 1. _ 7 s i• <x s O °ZNm ^f°- F . o imp pow 0 0 0 ;�� "L � N ELEVATION, NGVD (FEET) ELEVATION, NGVD (FEET) mss "s ° I I ELEVATION, I 1 I I I I 1 s' R11.4 �° ° Z N ♦ W N 0 N N J. N ♦ W N 0 N W ,�I.I Km N 1 1 I 1 I 1 1 C) sr+r 0 �C )< 0 C ' °op i� E 1 I G m _ _ b I I I 4u t 0 jAZ O' +1 I u O I O O �m� N W I mK0 � 0 c o c 1 �7 OA NN O IrOIr�1 pAo O p `L tiO O N m `•1 I8 I vl O Z I 1 p °_ _ t_ I I -< 3 0 S I 0 D . °- Y I (7 we u I n !n e D o . D DI r DI I r 6 ZN I ZN m°. 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Z iN ° -o �"N_ ,. n o z 'U m° A m < O m - o in y - I G r-ri .�io- in f �-nzcn r * x>>0) m RI N .• Z"�U) El 0- n A _, • m 12 Q 3 A--• .°4 - I Z 8 z rn Iv 0 O Z N -0'vNw0 G I O- ',� 310 m O N N -I W O N O J O 3 56 Page 292 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 6.3 Maintain Optimal Hydrographic Environment of Flushing Channels Biological monitoring work has conclusively shown that the improved drainage which has been achieved through excavation of small flushing cuts within the forest basin has greatly alleviated ponding and contributed to the observed improvements in Clam Bay. Work Items: 1. Monitor and Maintain Existing Flushing Channels The condition of flushing channels will be evaluated as part of the annual biological monitoring. Should debris or filling in of any areas be noted, work crews will be dispatched to hand-clear the areas in question. Timeframe: Monitoring as per biological surveys, work completed as needed. Performance Criteria: All channels should be functioning to alleviate ponding as designed. Responsible Personnel: Pelican Bay Services Division Project Managers: (Currently Turrell, Hall &Associates, Inc.) (Currently Lewis Environmental Services, Inc.) 57 Page 293 of 358 CLAM BA MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 k :4.,o• ii...%), t. ..,14,\,...-I Lic 14.:147 4c gad, Fp' i a j . ! ][t w fill' , - '''i ` :: 4" �{` a 'Ra , , ... , , . , ti t". a irs it- co 4 Ad E t I;:' .0 t` -, + 'a . ITIrr p,v' �p � —Gli r . ,. ,, , , , ,t1 ,.......,, ,,.. . ,4,,...,.., „.. .,. .. , . . , .4 C on f ° > 1-`',"t-= Zc,+t' '. ' cat r a AO r6 „i( E° 1 6 figu p h? e}yN�� ;yAya[' 4.-2.t ' ,4�rI 1;2~C,.,,, .a■ : 4. ' .4, ee i i E__, O y : 8 V F 4 • ` fib' ,„,47,. ...„8 8 t Cn In i m 0- , wit NWIt27-,,, . - - i LEI r .. 1 � .' a 1.r I ( r,F = 1 mac.c. Hand dug flushing channels (from 2006 Annual ReporH 58 Page 294 of 358 CLAM BAY MANGROVE MN Pelican MANAGE Bay Services E DivisioT PLAN n May 15, 2008 2. Alleviate Ponding with New Channel Construction Should new areas of ponding or surface accumulation of water be identified during monitoring work, project managers may carry out additional channel excavation. Timeframe: Monitoring as per biological surveys, work completed as needed. Performance Criteria: Insure that there are no areas of extensive surface water accumulation within mangrove forests of the Clam Bay system. See enclosed design parameters for cross section standards of flushing cuts. Responsible Personnel: Pelican Bay Services Division Project Managers: (Currently Turrell, Hall & Associates, Inc.) (Currently Lewis Environmental Services) , y"�t, t - *. '0`t � v A '41,. 1- . , `.4 »r ,C k° Efl t c t ` 1 t , � ` E : ,r 1 . II4 g ,, k R s y(''`I x YF" y ! i ,' k !r ¢ • `t. t �/t . �'' k ti -� ,ez s ib`" i t wck ? - r \ �e 5 � �, 2007 growth and visible channel cut it e � die- " k- M' off area. r � X94 ;' 2003 new growth resulting from channel cuts in main die-off area. 4� � ` 4 � y c4( 59 _a„ Page 295 of 358 ll )ec 12. 1997 - 12:3339 D.\DWG\0103\ 79 •dr9 IINTERNAL MAIN CHANNEL RESTORATION II I 14 iir.-/ \i", ,kp w,, •ry la . • t.f, . .f' • ..... I EXISTING PROPOSED III SECTION X-X I INTERNAL SIDE CHANNEL 111 RESTORATION /1111111 1 I (04 1 i 12•-1a' 4 . MHW 1.50 FT. NGVD. MLW - (-)0.51 FT. NGVD (GULF TIDE ELEVATIONS IIIIEXISTING PROPOSED PER D.T. TACKNEY. P.E.) SECTION Y-Y 111 SECTION Z-Z TYPICAL EXISTING AND PROPOSED CROSS- SECTIONS, HISTORICAL MAIN DRAINAGE • CHANNELS AND SIDE DRAINAGE CHANNELS. N.T.S. PROJECT CLAM BAY Figure APPLICANT PELICAN BAY SERVICES DIVISION 4.5.3.(f) X1 I L S O N COLLIER aTAPR., 1997 LEWIS ENVIRONMENTAL x` •• "" 49s 1.x:25£ 1 g SERVICES, INC. ]j,33 "1 �+NO 1102-080-001-ERPAP PER-79 MILLER DIFON trAV a). LEV.v STEPHEN MEANS 69 qr.L.M.B./918 .15 or 38 r REC. 36644 Page 296 of 358 Dec 12. 1997 - 12:34:13 Q:\DWG1CtQJ\PROn dug I I j INTERNAL LATERAL CHANNEL RESTORATION 111 14.414c3 I II -tr I is It EXISTING PROPOSED SECTION XX—XX INTERNAL SWALE RESTORATION MHW — 1.50 FT. NGVD. IMLW - (-)0.51 FT. NGVD (GULF TIDE ELEVATIONS PER D.T. TACKNEY, P.E.) SMALL LATERAL CHANNEL AND SWALES N.T.S. o' PROJECT: CLAM BAY Figure APPLICANT: PELICAN BAY SERVICES DIVISION 4.5.3.(g) WILSON COLLIER °"nAPR., 1997 LEWIS ENVIRONMENTAL 4.4 "' 6. R" z 49S 23f 1+/97 SERVICES, INC. 'NO 02-080—OO1—ERPAP PEP-79 MILLER .�, . LQ1 r0 STEPHEN MEANS L.M.B./918 36 co.38 fW REG. 36844 Page 297 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 6.4 Maintain Stormwater Management System,Including the Berm/Mangrove Interface Proper functioning of the Pelican Bay drainage system is a key element for healthy communities in Clam Bay. Without sufficient attenuation of the nutrient and chemical loads in surface water run-off, water quality in the natural system can deteriorate. Storm and freshwater studies completed in 2000 per requirements of original permits, showed that minimal additional storage area for surface water run-off was available. It was concluded that maintenance of the system as constructed was the only feasible and cost effective course of action. Work Items: 1. Maintain Surface Water Storage, Conveyance,and Distribution Capabilities Surface water storage areas include swales, lakes and ditches throughout Pelican Bay as well as the collection and spreader swales on either side of the water management berm. These areas can become clogged with trash, vegetative debris, sediment, and volunteer seedling generation. Routine maintenance activities are needed on an on-going basis to keep these storage and conveyance areas clean and functioning optimally. Trimming or removal of vegetation blocking the swales will be conducted. Periodic spraying of clogging vegetation with EPA approved herbicides may be conducted in conjunction with removal of debris or sediment. Clogging by exotic or nuisance vegetation is further discussed in objective 7.8. Timeframe: Observations carried out daily,maintenance work as needed. Performance Criteria: No restriction or blockage in any part of the surface water management system. Responsible Personnel: Pelican Bay Services Division - ..-.- .:- ,, , . - ' '4' '7' .,,,, '' ...ve'' 4 AO OP° .g4 're`N.��l 7 � A ire"'... * xS.,:.:.y�, Z i a - ' 4• .4. s ' rawt 62 Page 298 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 2. Maintain Physical Components of the Stormwater Management System Culverts, pipes and flashboard risers are some of the physical parts that make up the drainage system for Pelican Bay. For the system to operate as designed, no structural deficiencies should exist in any part of the system. Any breakages or weak areas should be rectified. Flashboard risers should remain in place as specified in the South Florida Water Management District Permit. Timeframe: Observations carried out daily,maintenance work as needed. Performance Criteria: No loss of integrity in any part of the surface water management system. Responsible Personnel: Pelican Bay Services Division .41(‘ 63 Page 299 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15,2008 6.5 Manage and Improve Water Quality Clam Bay is a unique estuarine system in that the majority of the watershed (the surrounding upland areas from which freshwater inputs reach the bays) is a developed area. Sustaining a healthy natural environment in a semi-artificial situation is a challenge embraced and successfully met by Pelican Bay residents and management. The stormwater system was designed to attenuate rainwater run-off so that flows reaching natural areas are of the highest water quality standards possible. This goal entails monitoring of water quality parameters, maintenance of the stormwater system (objective 7.4) along with a willingness to consider any changes that might improve the system. Work Items: 1. Continue Water Quality Monitoring Sampling and analysis of a suite of parameters has been carried out since 1981 as a commitment of the SFWMD permit for the development. This regime should be continued, with the possibility of adding parameters to make this sampling effort consistent with other efforts in the City of Naples and Collier County. The current suite of sampling parameters is included here: • Temperature • Conductivity • Ortho-phosphate • pH • Total Phosphorus • Total Dissolved Solids • Biological Oxygen Demand • Dissolved Oxygen • Salinity • Ammonia • Silica Dioxide • Nitrate • Chlorophyll a • Nitrite • Phaeophytin a • Total Nitrogen • Total Carbon When possible, information on water clarity should also be collected. 1111°‘ Timeframe: Monthly sample collection to be analyzed by a state-approved lab for the duration o .e t rmit. Annual collation of results. Performance Criteria: No negative change in designation of water bodies should be observed, i.e. at h ft = urn State standards (per 62.302.530 F.A.C.)for each parameter should be maintai•-• Responsible Personnel: • PBSD for sample collection and processing 64 Page 300 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 Sampling Locations: i `. , ,., ..- t _ R d` !, .ww .{e k. +", -R1D mac' ' ,w.,„ .1 . f '` g r 4 Ns�° a yyN � .. �'_ $�' ��e ,'-,-4- i a, ate` - . .e..,: .^7.' •- - _ t " '. s I + , : #"s$ ry ,fl- 'a4" B-wy E4^ S k'FP7%f'..n b AxRL` 2 3k a 140 ,1 aminewarweittocouvour rr. "` P L_1 C.A hJ B 4".:,.1.0- WI (110510.* i= is FIGURE 5-WATER SAMPLE LOCATIONS 4...A.,.,,.a..�, ...M 4 ...�� fi a 2. Analysis and Comparison of Annual Results x E ,. mow. , ftH 5, 3�.;c An annual summary of the collected data will be prepared as a written report with, p. t:=a 1 and � tabular data presentation. Results will be compared with previous years and with conegl ' 7=a logical monitoring results. , -. Timefame: y .to��Sample collection on a monthly basis and report generation once per ear,� 4 10 Performance Criteria: 4 ` Completion of a written report with relevant tables and exhibits. Appropriate QAC protocols should be established and adhered to with respect to sample collection and data compilation. 65 Page 301 of 358 \ Y CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 Responsible Personnel: PBSD Environmental Project Managers (Currently Turrell,Hall&Associates, Inc.) 3. Identify Watershed Improvements Advancements in environmental best management practice continue to be made. Where any protocol is considered to have potential benefits and is practical and cost-effective, it should be considered for implementation within the system. This could include: • Modification to irrigation systems. • Changes in fertilizer/pesticide products and applications. • Modification to surface water management system. • Other BMP improvements that may come about. • Resident and visitor educational efforts. • Landscape contractor education or requirements. • Fountains and/or bubblers. Timeframe: On-going. Performance Criteria: Not applicable. Responsible Personnel: PBSD Environmental Project Managers: (Currently Turrell, Hall&Associates, Inc.) 4 4114 101411"P*41 66 Page 302 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 6.6 Monitor Ecosystem Communities The health of seagrasses and condition of mudflats and other benthic areas within Clam Bay sheds light on associated tidal flushing and water quality issues. Marine life supported throughout the system (i.e. fish, macro-invertebrates, and micro-invertebrates) can provide indicators as to the health of the ecosystem. The importance of understanding the system in its entirety cannot be underestimated. Work Items: 1. Annual Seagrass and Benthic Community Monitoring Continuation of existing survey work focused on tidal flats east of Clam Pass, the channel south to Outer Clam Bay and Outer Clam Bay. Snorkel surveying of the established transects will continue to track those specific seagrass beds. In order to obtain a more detailed overview of the entire Bay and to track more ephemeral grasses throughout the Bay, twice-a-year random sampling may be conducted. Even further expansion of the transect surveys conducted every five years or so can provide an estimation of coverage of seagrasses within entire bay. Care must be taken with this technique due to the fact that ambient environmental conditions can drastically affect seagrass growth in any given year. Timeframe: Annual monitoring work in late summer. Bi-annual work conducted mid spring and late summer. Full Bay-wide survey conducted every three to five ears. Performance Criteria: Completion of a written report containing results of survey efforts undertaken in the give year. Responsible Personnel: Pelican Bay Services Division Project Managers: (Currently Turrell, Hall &Associates, Inc.) *** Some of this information may be collected by the Coastal Zone Management (CZM) office of further investigations within the system. If so, coordination with CZM will occur " information will be shared between the two parties. g legk 2. Offshore Hardbottom Community Monitoring Continuation of existing monitoring and observations of the hard bottom com {_ < > s". e from Clam Pass. Monitoring has been conducted prior to and immediately folio o 117''',Y44•ging and beach renourishment activities. Timeframe: a, Annual monitoring work in late summer or as needed during dredgi , s .,. 67 Page 303 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 Performance Criteria: Completion of a written report. Responsible Personnel: Pelican Bay Services Division Project Managers: (Currently Turrell, Hall &Associates, Inc.) *** This information is currently being collected by the Coastal Zone Management (CZM) office as part of the mitigation requirements for the latest (2006) beach re-nourishment project. Coordination with CZM will occur to insure that this information is collected and shared. 3. Marine Organism Monitoring The last systematic marine organism survey effort for Clam Bay was conducted as part of the formulation of the 1995 Inlet Management Plan for Clam Pass. Collection and documentation of seagrass, algae, invertebrates, and fish species found throughout the system will occur. This information will be updated and compared to the 1995 information. Periodic sampling efforts can then be undertaken so that changes or shifts in species richness or concentration can be compared. This will provide more data to formulate future management activities or goals and support assertions that may be made with regards to overall system health. Timeframe: Monitoring on a three to five year schedule. Performance Criteria: Creation of a repeatable survey methodology and completion of a written report and the completion of each survey effort. Responsible Personnel: Pelican Bay Services Division Project Managers: (Currently Turrell, Hall &Associates,Inc.) *** This activity is being contemplated by the Coastal Zone Management office as part,: : e,_sanded V scope of work. If so, results from the survey efforts will be examined in conjunction fforts undertaken as part of this Management Plan. NY 68 Page 304 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 6.7 Monitor Mangrove Communities Monitoring work has shown how crucial early detection of stress can be in responding quickly to ponding or signs of deterioration. Considerable savings in money and time can be realized before large-scale losses ensue. A long-term observation of fixed plots shows how the system responds to the physical changes carried out and identifies the most effective of these. Close examination of infra-red aerial photography also can help to highlight stressed areas so that survey efforts in the mangrove community can be concentrated. In addition, one of the best monitoring activities comes as a result of the residents of Pelican Bay. Residents within the high rises often call to report stressed or changing areas within the system even before they are observed by the project managers. Living over the forest and observing it every day gives these residents a unique perspective that allows them to quickly notice even minute changes within the forest. Work Items: 1. Annual Mangrove Community Monitoring Continuation of existing survey work focused on fixed vegetation plots as well as aerial photography of the entire forest system. Timeframe: Annual monitoring work in late summer. Performance Criteria: Completion of a written report documenting monitoring results. Responsible Personnel: Pelican Bay Services Division Project Managers: (Currently Turrell, Hall & Associates, Inc.) 2. Annual Hydrographic Monitoring Within Forest Area Install and monitor water level gauges within the forest system. Timeframe: Install gauges during monitoring work in late summer. Performance Criteria: Collect data at least quarterly during year Completion of a written re.. >; ua Responsible Personnel: Pelican Bay Services Division Project Managers: (Currently Turrell, Hall &Associates, Page 305 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 3. Mangrove Trimming Periodic trimming of mangroves is required along the waterways and pathways through the system. Trimming to keep open the waterways for tidal flushing is discussed earlier in this section but additional trimming to keep the canoe trail, berm, and boardwalks is also required to maintain access through these areas as well as for resident and visitor safety. The roadway along the western side of Bay Colony and the road into the Strand are also subject to overhanging mangrove branches and these roadways will also be kept clear of mangrove branches through approved trimming activities. Areas of excessive overgrowth or blockages caused by leaning trees and fallen branches will be removed per State (DEP) mangrove trimming guidelines on an as-needed basis. PBSD will notify the project managers who will document pre-trimming conditions and in turn notify DEP prior to any trimming work being done. Post-trimming conditions will also be documented. See enclosed trimming protocol for additional information regarding DEP guidelines. Timeframe: As needed. Performance Criteria: Overhanging or broken branches, limbs, and/or roots will be removed to maintain access through and along the canoe trail, berm, and boardwalks. Responsible Personnel: Pelican Bay Services Division Project Managers: (Currently Turrell, Hall & Associates, Inc.) WiTKIP ak g t 2°HOy 70 <r Page 306 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 6.8 Exotic and Nuisance Vegetation Control The spread of exotic vegetation is a threat to native communities and can reduce the effectiveness of the stormwater management system. Clogging of lakes and drainage swales with aquatic weeds has been a historic problem in Pelican Bay, which has been addressed through herbicidal treatments. A large-scale cattail removal effort was undertaken in 2002 for areas west of the water management berm. A small portion of the removal area was replanted with natives as an experimental effort. Invasive exotics such as Brazilian pepper and Moon vine have been observed in several basin forest areas. These exotics and any others observed in the system are noted and removed. 39 77 Post-restoration conditions 1°‘ rr�� Y { µ� Y Cattail infestation along perimeter of mangrove forest. (pre-restoratio conditions) 71 Page 307 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 Work Items: 1. Exotic Species Removal Treatment and removal of observed exotic species shall be carried out throughout the system on an as- needed basis. Timeframe: Maintenance and treatment as needed. Coverage assessment will be made on an annual basis following biological monitoring surveys. Performance Criteria: Areal coverage of exotic species not to exceed 5% between maintenance activities. Responsible Personnel: Pelican Bay Services Division 72 Page 308 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 6.9 Continue and Improve Community Awareness and Involvement The strength and importance of community support for mangrove and habitat restoration is a unique feature of work in Clam Bay. Residents of Pelican Bay accepted a benefit assessment to raise funds to carry out initial enhancement and restoration work. Work-shops and public meetings are continually well attended. The community has also sponsored educational work such as a canoe / kayak trail and guide, a field guide of the plants and animals in Clam Bay, interpretative signage, and a documentary film of the restoration efforts undertaken to date. Recognition and nurturing of this important facet of the project is the focus of this management objective. Work Items: 1. Maintain Trails and Informational Signage within System Periodic maintenance and repair of the canoe trail markers and interpretive signage must be undertaken to keep these items in good viable condition. Periodic updates on the status of the canoe trail (i.e. navigability and signage status) should be provided to the FFWCC. Timeframe: Annual inspection of signage, and repair or replacement when needed. Updates to FFWCC regarding the canoe trail should be provided every three years. Performance Criteria: Presentation of written and verbal report documenting inspection and repair actions undertaken during the past year. Responsible Personnel: Pelican Bay Services Division Project Managers: (Currently Turrell, Hall &Associates, Inc.) and sub-consultants as appropriate. avev 2. Annual Meetings Results of monitoring work and a summary of annual efforts and planned activities a 4 to the Pelican Bay Services Division management board via public meetings on an annual basis Timeframe: , Per scheduled public meeting. 'v Performance Criteria: Presentation of written and verbal report documenting work mon ,-1.1.;4,. g work conducted during the past year 4 x;. kAY 73f Page 309 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 Responsible Personnel: Pelican Bay Services Division Project Managers: (Currently Turrell, Hall & Associates, Inc.) and sub-consultants as appropriate. 3. Participation in Information Exchange with Concerned Parties The Collier County Coastal Zone Management office in conjunction with the City of Naples and various citizens groups has sponsored an Estuary Discussion Group relative to Clam Bay. The purpose of this group is to discuss and explore work efforts outside of the scope of this Management Plan designed to enhance and improve conditions within not only Clam Bay but also waters to the south. Pelican Bay will provide any data gathered through the implementation of this Management Plan to the discussion group so that it can be included or incorporated into any plans or activities contemplated b that group. Ina addition, PBSD will continue to foster dialogue and information sharing with the public. Examples may include organizing informal workshops, providing items for local newsletters or other print media, or other, information disseminating altern atives. Timeframe: As requested Performance Criteria: Not applicable Responsible Personnel: Pelican Bay Services Division Project Managers: (Currently Turrell, Hall & Associates, Inc.) and sub-consultants as appropriate. 74 Page 310 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 Clam Bay Management Plan Amendments Studies within the Clam Bay Estuary as well as in other similar local ecosystems are either ongoing or expected to occur within the asked for time frame of this document. The Management Plan is not expected to be a static document and ongoing research and data collection related to water quality, hydrographic changes in the various areas of the system, benthic community health, mangrove community health, exotic and nuisance vegetation control and public education will be conducted and/or collected. Conclusions, recommendations, or alternative management activities that come about as a result of studies conducted outside of the scope of this management plan will be examined and considered by the Pelican Bay Services Division and its consultants. Those modification that are found to be viable, pertinent, and economically feasible alternatives or additions allowed under the scope of this plan will be added to the plan. Those changes in management activities or new work items that are outside of the scope of the Plan but are considered important or practicable by the Pelican Bay Services Division and its consultants will be submitted to DEP and the ACOE for consideration and inclusion into this management plan. sa. 1 75 Page 311 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 Clam Bay Project Research Paper Bibliography 1. Gee &Jensen Engineers, Architects and Planners, Inc., 1978, Hydrographic Study Clam Bay System Collier County, Florida for Coral Ridge- Collier Properties Inc., report. 2. Tri-County Engineering, Inc., 1971, Tidal Datum Plane Determination for the Collier Company. 3. Davis, R.A. Jr., Gibeaut, James C., 1990, Historical Morphodynamics of Inlets in Florida: Models for Coastal Zone Planning, Technical Paper. 4. Department of Coastal and Oceanographic Engineering, Florida Engineering and Industrial Experiment Station, University of Florida, 1970, Proposed Navigation Entrance to Clam Bay on Marco Island, Collier County, Marco Island Development Corporation,technical paper. 5. February 1979, Environmental Assessment Northwest Fill Area for Pelican Bay, Turrell& Associates, Inc., technical paper. 6. Devlin, Donna J., Gore, Robert H., Proffitt, C. Edward, 1987, Preliminary Analyses of Seagrass and Benthic Infauna in Johnson and Clam Bays, Collier County, Florida,Natural Resources of Collier County Florida,technical paper. 7. Devlin, Donna J., Collier County Beach Renourishment Project: A Survey of the Marine Benthos,technical paper. 8. Heald, Eric J., Tabb, Durbin C., Roessler, Martin A., Beardsley, Gary L., Ward, Gerlad M., Durrance, Dallas H., Yeend, John S., 1978, Carbon Flows in Portions of the Clam Pass Estuarine System, Collier County, Florida, Tropical Biolndustries Company and Gee and Jenson, Engineers-Architects-Planners, Inc.,technical paper. 9. 1994, Clam Bay Natural Resources Protection Area Management Plan Draft, Collier Co Natural Resources Department,technical paper. 10. Worley, Kathy, Hennig, Markus, July 2000, Clam Bay Mangrove Projects: Inter 4 , ary of Statistical Results, The Conservancy of Southwest Florida,technical paper 11. Benedict, Mark A., Harvey, Judson W., Curran, Maura E., 1983,Part 1 .x:- an ,t Planning and Implementation Strategies at the Local Level,Natural Re h County Florida, technical paper. 12. Benedict, Mark A., Harvey, Judson W., Curran, Maura E., 1,!„, I Th a ach in Collier County: A Model in Southwest Florida,Natural Resource � • r lorida,technical paper. „ .f 76 Page 312 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 13. Benedict, Mark A., Harvey, Judson W., Curran, Maura E., 1983, Part 3 A Resource Management Program for the Coastal Barriers of Collier County Florida,Natural Resources of Collier County Florida, technical paper. 14. October 1990, Collier County Sand Source and Environmental Report Phase II Hard Bottom Characterization, Continental Shelf Associates, Inc., technical paper. 15. Hartwell, Richard W., Hatcher, James M., Grabe, Stephen,August 1994, Clam Bay Natural Resources Protection Area(NRPA), Collier County Environmental Services Division, Publication Series NR-SP-94-01,technical paper. 16. Dean, R.G., O'Brien, M.P., December 1987, Florida's West Coast Inlets Shoreline Effects and Recommended Action, Coastal and Oceanographic Engineering Department and Division of Beaches and Shores Department of Natural Resources,technical paper. 17. Heald, E.J., Roessler M.A., Beardsley, G.L., 1979, Litter production in a Southwest Florida Black Mangrove Community, Reprint from Proceedings of the Florida Anti-Mosquito Association 50th Meeting, Abstract. 18. May 1970, Coastal Engineering Study of the Proposed Clam Pass Improvement, The Collier Company, Department of Coastal and Oceanographic Engineering,technical paper. 19. Sarkar, Chiranjib K., October 1972, Hydrographic Investigation of the Clam Bay System, Tri- County Engineering, Inc., Technical paper. 20. June 1979,A Comparative Study of the Water and Carbon Flows of Upper Clam Bay, Tropical BioIndustries and Missimer and Associates, Inc.,technical paper. 21. Heald, Eric J., Roessler, Martin A., December 1979, Invertebrate Population Studies in the Vicinity of Upper Clam Bay, Collier County, Florida, Tropical BioIndustries,technical paper.,,;. �1; 22. Heald, Eric J., July 1983, Populations of Melampus coffeus and Cerithidea scalariformis of Upper Clam Bay, Collier County, Florida, Tropical BioIndustries, Inc.,technical pa .. 23. Heald, Eric J., July 1983,Fish Populations of Tidal Ponds West of Upper Clam ' o 'er County,Florida, Tropical BioIndustries,technical report. 24. Crewz, David W., 1989, Clam Pass Park mangrove damage, Departme tura ces Interoffice Memorandum. , 25. Wanless, Harold R.,Risi, J. Andrew, July 1996, Observations • ier� St atigraphy and Groundwater Flow in the Vicinity of the Mangrove Die : ent t ,i= Strand,Pelican Bay, Collier County, Florida, Collier County Natural Rest technical report. 26. Wanless, Harold R., February 1975, Report on the aft .� Florida,technical report. 77 v e Page 313 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 27. Hawkins, Mary Ellen, Obley, Ross P., "Pelican Bay-Visit and Revisit."Urban Land Vol. 40, No 11., (December 1981) 21-27. 28. Lorenz, William, D. Jr., January 1996, Clam Bay NRPA Nutrient Reduction Program Draft, technical report. 29. Scott, Will, December 1993, "Water, Water...Everywhere what you may not know about Pelican Bay's innovative water management system."Draft- memorandum,ABB. 30. Heald, Eric J., January 1972, Investigation of Fluctuations in the Clam Bay System, Tri-County Engineering, Inc and Tropical BioIndustries,technical report. 31. Acquaviva, Daniel J., October 1993, Responses to Development of Regional Impact Questions Number 14 and 17 Pelican Marsh Community,North Naples, Florida, ViroGroup Inc./Missimer Division, technical paper. 32. Davis, Richard A Jr., Gibeaut, James, January 1990, Historical Morphodynamics of Inlets in Florida: Models for Coastal Zone Planning. Department of Geology, University of South Florida, technical report. 33. Knapp, Michael S., Burns, Wm. Scott, Sharp, Timothy S. Preliminary Assessment of the Groundwater Resources of Western Collier County, Florida. Technical publication#86-1. February 1986. 34. "Modification of Permit No. 11-00065-S Pelican Bay." Pelican Bay Improvement District Staff Report. March 1983. 35. Preliminary Hydrographic Assessment Clam Bay Systems. Tackney&Associates, Inc., August 1996. 36. Hole, Montes &Associates, Inc., Post, Buckley, Schuh& Jernigan, Inc. Water Mana•e �. Plan Construction Permit Application for Systems 4 and 5. Pelican Bay Improvement B ` September 1982. 37. Goodrick, Robert L. "Pelican Bay—Environmental Considerations,permit Noy `- 1 -!r-S." Memorandum to file, January 15, 1982. 38. Hermanson, George H. "Proposed Modifications to Drainage Area 3, " +le, Montes &Associates, Inc., January 28, 1988. m 39. "Modification of Permit No 11-00065-S Pelican Bay." Pelf . pro° -nt District Staff Report, 1983. 78 Page 314 of 358 tom . CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 40. Florida. South Florida Water Management District. In Reply to Request for Modification of Surface Water Management Permit No. 11-00065-5." October 19, 1978. 41. Stanley W. Hole and Associates, Inc., Post, Buckley, Schuh& Jernigan, Inc. Water Management Plan Permit Application. Pelican bay Improvement District, April 1978. 42. Florida. Collier County Environmental Services Division Inlet Management Resources. Bibliography. 43. Florida. South Florida Water Management District. Application No. 04718-C for Surface Water Management Permit Staff Report. August 1978. 44. Post, Buckley, Schuh &Jernigan, Inc. Consulting Engineers and Planners. Engineering Report Water Management System VI for the Pelican Bay Improvement District. February 1984. 45. Wilson, Miller, Barton & Peek, Inc. Pelican Bay/Clam Bay Water Management System Contributing Areas. CAD drawings. October 1998. 46. Coral Ridge-Collier Properties, Inc. Pelican Bay A Planned Residential Community. 47. Florida. Natural Resources of Collier County Florida. Part 5 Coastal Zone Management Units: Atlas. 1984. 48. Suboceanic Consultants Inc.Naples Beach Study Report. University of Florida Coastal Engineering Archives. August 1980. 49. Wilson, Miller, Barton & Peek, Inc. Pelican Bay Mangrove Investigation, Pelican Bay Water Management System-Stormwater Detention Volume and Water Budget Analyses.April 1996. 50. Continental Shelf Associates, Inc. Collier County Sand Source and Environmental Report Phase I Hard Bottom Mapping. Coastal Engineering Consultants, Inc, October 1990. 6 � 51. Collier County Pelican Bay Services Division. Clam Bay Restoration and Manat emen � Florida Environmental Resource and Joint Coastal Permit Application, Federal Dre., ` and Fi permit Application. April 1997. 52. Missimer and Associates, Inc. Subsurface Water and Carbon Floes to Portions o .m Pass Estuarine System, Collier County, Florida. Technical report, March 197'V .� 53. The Collier Company. Coastal Engineering Study of the Proposed Clam ~=ment. Engineering and Industrial Experiment Station, College of En!'=s :!g, amity of Florida. May 1970. 4411W, -10 ro- 54. Crewz, David W. Florida. Department of Natural Resources zfl; ' 1 angrove Damage. Interoffice Memo, May 1989. 4 79 ea � Page 315 of 358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 55. Wilson,Miller, Barton&peek, Inc. Figure 1 Existing Stormwater Flows on an Outgoing Tide (Diagrammatic). Map of Clam Bay. 56. Wilson,Miller, Barton& Peek, Inc. Figure 2 Proposed Expedited Conveyance Plan of Stormwater Flows on an Outgoing Tide (Diagrammatic). Map of Clam Bay. 57. Acquaviva, Daniel J. Site Specific Investigations to Obtain Hydrologic Information for the Design of Horizontal Well Systems at Pelican Bay,Naples, Florida. Water Resource Solutions, Inc., September 1999. 58. Hole, Montes & Associates, Inc. "Evaluation of an Onsite Irrigation Water Source." The Pelican Bay Improvement District, April 1984. 59. Post, Buckley, Schuh& Jernigan, Inc. Hydrology and Geology of a Proposed New Well Field Site in North Collier, Florida. For the Pelican Bay Improvement District, March 1978. 60. Obley, Ross P., letter to Jim Ward. July 1999. 61. Gee &Jenson Engineers,Architects & Planners, Inc. "Pelican bay System VI Drainage."April 1983. 62. Wilson, Miller, Barton&Peek, Inc. "Pelican Bay." Memo to file. May 1987. 63. Florida. "Aquatic Plant Management Annual Operations Report." Florida Department of Environmental Protection Bureau of Aquatic Plant Management. January 1999. 64. Florida. "Agreement for Delivery and use of Treated Wastewater Effluent for Spray Irrigation." Official record of Collier County, Florida. Interoffice Memo. August 1996. 65. Florida. Department of Environmental Protection. "Aquatic Plant Management Permit." January 1999. 66. Davis, Richard A.,Hine, Albert C., Bland, Michael J. "Midnight Pass,Florida ml .t.bili Due to Man-Related Activities in Little Sarasota Bay." Coastal Sediments `87, • 67. Metz, Charles. "More than Mangroves at Stake."April 1997. 68. Florida. South Florida Water Management District. "Request for Modi :ace Water Management Permit No 11-00065-S." Staff Report. Oc v: 97:' 69. Florida. South Florida Water Management District. "Wat e 1998. 80 Page316of358 CLAM BAY MANGROVE MANAGEMENT PLAN Pelican Bay Services Division May 15, 2008 70. Hartman, P.K. "Excavation Permit No. 59.156." Collier County Water Management Department letter,March 1983. 71.Fox,Lloyd II. "Collier County-DW Spray Irrigation-Unrestricted Public Access(Residential) Groundwater Monitoring."Department of Environmental Regulation, State of Florida, letter. May 1987. 72. Florida. South Florida Water Management District. "Water Use Permit Staff Report."June 1978. 73. Florida. South Florida Water Management District. "Surface Water Management Staff Review Summary."April 1992. 81 Page 317 of 358 0 o w i s�' i n CO . 1 Z - Z > § 0 U c c c o U O C ... 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Nationwide permit application documents(using available resources to describe features of Clam Pass) Page 2 of 19 MANATEE BIOLOGICAL EVALUATION March 2011 The Corps has determined that your project has the potential to affect the endangered West Indian manatee. Therefore, pursuant to Section 7 of the Endangered Species Act of 1973, as amended,the Corps is required to seek consultation from the U.S. Fish and Wildlife Service for the proposed project. In order to assist us in making our final effect determination, we need you to provide us with information for items 4-8 below: 1. Description of the action considered: Maintenance dredging of Clam Pass in order to restore tidal flow and maintain ecological enhancements to the bay and mangrove system. 2. Description of the specific areas that may be affected by the action(scope of analysis): a. The proposed"action area"t is determined to be all or a portion of reach 29,based on the overall project purpose which is to maintenance dredge Clam Pass in order to restore tidal flow. b. The project site is located within which regional management unit of the West Indian manatee?(response is Bold) (1) Atlantic (east coast of Florida from St. Mary's River south to Cape Sable in Monroe County, and the lower St.Johns River from its mouth south to Rice Creek in Putnam County) (2) Upper St. Johns River (Rice Creek in Putnam County south to State Road 528 in Orange and Brevard Counties) (3) Southwest Florida(west coast of Florida from Pasco County south to Cape Sable in Monroe County) (4) Northwest Florida(west coast of Florida from Hernando County north and west to the Perdido River in Escambia County) 3. Description of any designated critical habitat that may be affected by the action. The action may affect the endangered West Indian manatee,but not affect its critical habitat. 4. Description of the manner in which the action may affect the manatee or its critical habitat: c. Habitat. Check those that would apply to within 1-mile of the project site and a brief description. (1) Source of warm water input to the area?N/A (2) Source of fresh water input to the area?Clam Bay consists of brackish water where the freshwater input is subsurface and from surface water run off from surrounding developments. Page 329 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3d. Nationwide permit application documents(using available resources to describe features of Clam Pass) Page 3 of 19 c) What is the estimated number of slips used for the following? d) Used primarily for day trips O. e) Used primarily for longer trips 0 f) Used primarily for dockside entertainment 0 f. Speed Zones. It is important to consider the presence and effectiveness of on-going enforcement activities within the action area. Is the project in a State-established manatee speed zone or Federal manatee refuge? Yes If not, how close is the nearest speed zone? miles? 5. Relevant reports, including any environmental impact statement, environmental assessment, or biological assessment prepared. Provide any relevant reports prepared for this project. Please see attached submerged resource survey report completed in June 2012. 6. Any other relevant information available on the action, the manatee and its critical habitat. Provide any other information available that would assist in our review of the effects your proposal may have on the manatee or its critical habitat, including specific actions you may propose to eliminate or minimize potential effects on the manatee and its critical habitat. N/A 7. A Florida Fish and Wildlife Conservation Commission (FWC) Manatee Impact Review. Provide a copy of the review, if applicable or available. Notify the Corps if the project is exempt from State permitting, regulatory review or authorized under a Noticed General Permit. N/A 8. Additionally, for projects within counties having a State-approved Manatee Protection Plan (MPP), a determination of project consistency with the MPP is needed. The FWC typically makes the determination and includes it in its Manatee Impact Review. The following counties have State-approved MPPs: Brevard, Broward, Citrus,Clay, Collier, Duval, Indian River, Lee, Martin, Miami-Dade, Palm Beach, St. Lucie, Sarasota, and Volusia. All State- approved MPPs are available for download at: www.myrwc.com. The Collier County MPP does not apply to dredging projects. The applicant will abide by the standard construction conditions to avoid impacts to manatees. g. If there is a FWC Manatee Impact Review available at the time of your application submission,include a copy of the review.N/A h. If the FWC review is not available at the time of application submission, you may attempt your own consistency determination and submit it with your application. If you do this, provide the supporting information and MPP reference which you believe makes your project consistent with the MPP for your county. In some cases, the supporting information may include a county MPP consistency letter. If so, submit it as part of your determination. Page 330 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3d. Nationwide permit application documents(using available resources to describe features of Clam Pass) Page 4 of 19 The"action area"is defined as the area to be affected directly or indirectly by the Federal action and not merely the immediate area involved in the action. Direct effects are those effects that are caused by or will result from the proposed action.Indirect effects are those effects that are later in time. Page 331 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3d. Nationwide permit application documents(using available resources to describe features of Clam Pass) Page 5 of 19 SEAGRASS SURVEY Page 332 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3d. Nationwide permit application documents(using available resources to describe features of Clam Pass) Page 6 of 19 CLAM BAY SEAGRASS MONITORING ANNUAL REPORT JUNE 2012 PREPARED BY: TURRELL,HALL&ASSOCIATES,INC 3584 EXCHANGE AVENUE,STE B NAPLES,FL 34104 Page 333 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3d. Nationwide permit application documents(using available resources to describe features of Clam Pass) Page 7 of 19 CLAM BAY SEAGRASS ANNUAL MONITORING REPORT JUNE 2012 1.0 INTRODUCTION AND METHODOLOGY Seagrasses are a valuable biotic indicator of environmental health and the PBSD has recognized the value in maintaining viable conditions for seagrass growth. The original permitted dredging design-entailed impacts to seagrasses within the channel between Outer Clam Bay and Clam Pass. Monitoring over the life of the permit was designed to allow documentation of the regeneration or loss of seagrasses within the system and follow the effect of increased tidal flushing on seagrass aerial coverage and density within the potentially affected beds. These monitoring practices have continued in order to further document the overall health of the Clam Bay system. The submerged resource survey was conducted on June 12th and 19th during high and low tides. This was to ensure a full survey was completed of the entire bay. Monitoring methods include examination of aerial photographs and ground truthing by in-water and wading surveys. Accurate estimation of seagrass coverage is primarily hampered by visibility. The type of seagrass and limited visibility make estimation through examination of aerial photographs almost impossible. The most effective survey technique has been diving and wading transects and the most effective time has been at low tides when shallow water and substrate exposure make coverage estimation easier. Best effort was made to overcome the visibility obstacles in those areas that were deeper. Due to the ephemeral nature of the grasses being monitored,the survey methodology has been slightly modified from what was originally permitted in the 1998 permits. It was noted early on that the seagrasses shifted in location from year to year and that fixed quadrats in the same location year after year did not accurately depict seagrass coverage or presence within the Bay. More general observations of the presence of grasses along these transects have been used to locate the grass beds with the quadrat measurements used to quantify coverage within those areas where grasses are found. Grass beds in or adjacent to these transects are then mapped with a handheld GPS unit(Garmin 76c)and transferred to an aerial exhibit. Page 1 of 12 Page 334 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3d. Nationwide permit application documents(using available resources to describe features of Clam Pass) Page 8 of 19 CLAM BAY SEAGRASS ANNUAL MONITORING REPORT JUNE 2012 2.0 SEAGRASS RESULTS Outer Clam Bay:Transect 1 Transect one was surveyed with snorkeling gear in water depths from 2 to 3 ft. Visibility was approximately 8-10 inches and was easily reduced if sediments from the bottom were stirred up. Shoal grass (Halodule wrightii) was found within quadrats 2, 3, 4, 5, and 6, and a small area of Paddle grass (Halophila decipiens) between quadrats 1 & 2 of this transect. The general area of grasses along this transect remained consistent with last couple of years and has expanded slightly from the original pre-dredging monitoring. Densities of grasses were higher throughout the entire transect compared to past years monitoring period. In addition to the grasses, oysters (Crassostrea virginica) were also observed along the mangrove fringe line. Oyster clumps (approximately 6 inches by 6 inches), upside- down jellyfish (Cassiopeia xamachana), lightning whelks (Busycon contrarium), fighting conchs (Strombus alatus), shell debris, and red, green and brown algae (Rhodophyta, Chlorophyta, and Phaeophyta) were also observed along Transects 1. Transect 1 80% - 751° ^ 70°/o - 60% 60% - t 50% - ✓ 40% - 30% 30% - 25% ro 20% - o- 0% - 57° 5% 0% VIM 1 2 3 4 5 6 Quadrat Numbers(14) Page 2 of 12 Page 335 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3d. Nationwide permit application documents(using available resources to describe features of Clam Pass) Page 9 of 19 CLAM BAY SEAGRASS ANNUAL MONITORING REPORT JUNE 2012 - • Y x Shoal Grass(Halodule wrizhtii)(Transect 5) ti 41; Shoal Grass(Halodule wriihtii) Page 3 of 12 Page 336 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3d. Nationwide permit application documents(using available resources to describe features of Clam Pass) Page 10 of 19 CLAM BAY SEAGRASS ANNUAL MONITORING REPORT JUNE 2012 Outer Clam Bay:Transect 2 Transect two was also surveyed via snorkeling gear and wading. Water depths ranged from 6" to 3 ft. with visibility approximately 10-12 inches but like Transect 1 this was easily reduced if sediments from the bottom were stirred up. A small area of Shoal Grass (Halodule wrightii) was observed along this transect between quadrats 1, 2, and 3. The density of this grass has increased since lat monitoring period with the maximum 15%coverage and was mixed in with some Caulerpa algae. Caulerpa was also observed in other areas along this transect and throughout the system. In addition to the grasses, southern hard clams (Mercenaria campechiensis), and lightning whelks (Busycon contrarium) were also observed within this transect. Transect 2 16% 0, 14% - 12% L > 10% 8 8% w 6% 5% I � go 4% a 2% 0% 0% 0% 0% 0% 1 2 3 4 5 6 Quadrat Numbers(1-6) Page 4 of 12 Page 337 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3d. Nationwide permit application documents(using available resources to describe features of Clam Pass) Page 11 of 19 CLAM BAY SEAGRASS ANNUAL MONITORING REPORT JUNE 2012 Outer Clam Bay: southwest sector,Transect 3 Transect 3 was surveyed with mask and snorkel gear. Water depths ranged from approximately 2 to 6 feet. Visibility varied between 12 to 16-inches. The small patch of turtle grass (Thalassia testudinum) was observed along the western mangrove fringe line. This patch has been observed in the same location for the past several years and this year has noticeable grown in size from the last monitoring period. The patch would still be considered small however has just about doubled in size with about 10 to 20 erect shoots with 2 to 5 leaf blades each. The extent of the rhizomes was not explored for fear of disturbing the bed. In addition to the grass, both blue-green and red algae were present within the shallows. There was also a lot of Caulerpa present in and around this transect area. Other observations made along this transect included the Florida fighting conch, upside-down jellyfish and a few scattered oysters right along the fringe line of the mangroves. Transect 3 12% 10% 10% m` 8% 8 6% 5% 5% u• 4% m. 2% 0% 0% 0% 0% 1 2 3 4 5 6 Quadrat Numbers(1-7) Page 5 of 12 Page 338 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3d. Nationwide permit application documents(using available resources to describe features of Clam Pass) Page 12 of 19 CLAM BAY SEAGRASS ANNUAL MONITORING REPORT JUNE 2012 Western side of waterway between pass and bay,Transect 4. Transect 4 was surveyed by both wading and snorkeling due to the varying water depths.Water depths ranged from 6 inches to 5 ft.with visibility of approximately 12 to 20 inches. The survey was conducted during low tide allowing the visual observation to be completed mostly by wading the entire transect. Large patches of Shoal grass (Halodule wrightii) were observed along the western mangrove fringe line, throughout most of the transect. Oysters were once again observed along the mangrove fringes on both east and west sides of the channel. Blue crabs (Callinectes sapidus), southern hard clams (Mercenaria campechiensis), and lightning whelks (Busycon contrarium) were observed scattered throughout this transect. Several fish species such as mangrove snapper (Lu Janus griseus), mullet (Mugil cephalus), and sheepshead (Archosargus probatocephalus) were also observed. Transect 4 60% 50% 50% 50% e 50% ppm 40% 35% C7 30% 25% v 20% 15% d 10% 1% 5% 0 0% % 1 2 3 4 5 6 7 8 9 Quadrat Numbers(1-9) Page 6 of 12 Page 339 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3d. Nationwide permit application documents(using available resources to describe features of Clam Pass) Page 13 of 19 CLAM BAY SEAGRASS ANNUAL MONITORING REPORT JUNE 2012 1 **"miry '..4 �a e Shoal grass(Halodule wrightit) l'= Southern hard clam(Mercenaria campechiensis) Page 7 of 12 Page 340 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3d. Nationwide permit application documents(using available resources to describe features of Clam Pass) Page 14 of 19 CLAM BAY SEAGRASS ANNUAL MONITORING REPORT JUNE 2012 Eastern side of waterway between pass and bay,Transect 5 Transect 5 was surveyed by both wading and snorkeling due to the same varying water depths as transect 4 has. Depths ranged from exposed substrate inches to 6 feet. In the original monitoring efforts, both shoal grass and paddle grass had been observed along this transect. As the tidal prism changed with the dredging activities, areas where grass had been present became subjected to longer periods of exposure and so died out. Shoal grass (Halodule wrightii)was again observed along this transect, however compared to years in the past a denser percentage was documented indicating a net improvement. Shoal grass (Halodule wrightii) has begun covering the entire mud flat along the eastern shoreline indicating the surrounding bay could be finally rebounding from the historic dredging impacts. Mud snails were observed throughout as well as Florida fighting conchs were also seen scattered throughout the entire transect. Further continued monitoring will indicate if the return is permanent or not. Transect 5 100% 90% 80% - 75% 60% Q 60% - c 40% - 25% it 20% - 0% 0% 1% 0% 0% 0% 1 2 3 4 5 6 7 8 9 Quadrat Numbers(1-9) Page 8 of 12 Page 341 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3d. Nationwide permit application documents(using available resources to describe features of Clam Pass) Page 15 of 19 CLAM BAY SEAGRASS ANNUAL MONITORING REPORT JUNE 2012 Inner Pass.shoal area east of Clam Pass,Transect 6 Transect 6 is oriented north to south and covers a large portion of the shoal area just east of the Pass.This transect was surveyed by wading on account of the very shallow water depths which ranged from exposed substrate to approximately 4 inches. Visibility was not impaired. Large amounts of shoal grass(Halodule wrightii)were observed once scattered throughout the entire southern end of the flat,around quadrats 1,2,3,4,5,and 6,with new additional coverage just north of the transect near the boardwalk. This bed has increased considerable two beds present are in the same locations as last year though the density of coverage has significantly increased. The main change in coverage on this transect from the original monitoring conducted during the first annual report is that the grasses seem to have shifted more towards the center and away from the perimeter of the transect. Densities seem to continue to increase indicating a healthy thriving bed. Remaining portions of this transect consist of a sandy sediment with green mat algae,mud snails, and Florida fighting conchs. Trasect 6 100% 95% 80% 75% 60% O 60% - 50% m 40% - 30% 0 a 20% 10% 15/0 0 0% — i10% 15 • 1 2 3 4 5 6 7 8 Quadrat Numbers(14) I Page 9 of 12 Page 342 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3d. Nationwide permit application documents(using available resources to describe features of Clam Pass) Page 16 of 19 CLAM BAY SEAGRASS ANNUAL MONITORING REPORT JUNE 2012 Inner Pass,shoal area east of Clam Pass,Transect 7 Transect 7 is oriented northeast to southwest and covers a large portion of the shoal area just east of the Pass. This transect like T6 was surveyed by wading and snorkeling due to the warring water depths which ranged from exposed substrate to approximately 4-feet. Visibility was not impaired. Large amounts of shoal grass (Halodule wrightii) were observed once again in the vicinity of the mangrove island, around quadrats 3 through 5. The large bed present is in the same location as last year though the density of coverage has increased. The main change in coverage within this transect from the original monitoring conducted during the first annual report is that the grasses seem to have shifted more towards the center and away from the perimeter of the transect. Densities seem to have increased over the past few monitoring periods, indicating a net improvement for this transect and surrounding area. Remaining portions of this transect consist of a sandy sediment with green mat algae,mud snails,and Florida fighting conchs. Trasect 7 75% iII 50% 10 1 2 3 4 5 6 Quadrat Numbers(14) Page 10 of 12 Page 343 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3d. Nationwide permit application documents(using available resources to describe features of Clam Pass) Page 17 of 19 CLAM BAY SEAGRASS ANNUAL MONITORING REPORT JUNE2012 Inner Pass,southern section of channel and shoal area,Transect 8 Like T7, Transect 8 is oriented northeast to southwest and crosses both the channel and the two shoal areas. The survey of this transect was conducted by both wading and snorkeling the survey line. Water depths ranged from exposed substrate to 4 feet with a visibility approximately 2 to 3 feet in the deeper portion of the channel. Shoal grass was observed on the east side of the channel in the shallower water depths, in the same areas as T7 and T6. This grass bed has increased slightly in size and density since the original monitoring efforts. The small patch of shoal grass observed two years ago on the west side of the channel has not returned, most likely due to sand build-up allowing this area to dry out during low tides. Densities have increased from the 10% to 45% coverage seen last year to around 10% to 95%. Large groups of mud snails, a few Florida fighting conchs,and small patches of algae were also observed. Trasect 8 45% 40% e 35% 30% 25% C 0% 1 2 3 4 5 6 Quadrat Numbers(1-6) Page 11 of 12 Page 344 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3d. Nationwide permit application documents(using available resources to describe features of Clam Pass) Page 18 of 19 CLAM BAY SEAGRASS ANNUAL MONITORING REPORT JUNE 2012 Seagrass Summary Seagrass coverage overall totaled 4.43 acres within the Clam Bay system appears to have decreased since the surveys conducted immediately prior to the dredging in 1998. What has been shown by the past twelve years monitoring is that there was a decrease in the monitored seagrass beds immediately following the initial (1999) dredging activities. This decrease appears to have stabilized around 2004 or 2005 and has reversed in the past few years to where the grass beds are re-establishing previous areas and new areas appropriate for the grasses (in terms of water depths and light penetration) are being colonized. Future monitoring of the seagrasses will be conducted to see if this trend continues. Page 12 of 12 Page 345 of 358 . :4'. :..!‘l !riff - , itskL* ..-,',,,Nigi,,_.''■•;1'kTo:T.- ,ft-### -w- ' , ' w c — • ---r-c t t 2 ' <= 1' \4z > n ,.... 0�000 y 01 '.° W eee®s U ? r E ,..,„„ 4 t r- 1111m@ t 0N 1 tp,.7 s�- - ••• 0 n �� • 0 .II D E a •. U ;�,. g 0 @ ._ 0 •T,r O a Y_§ ‘_ ,,,k a) M a i Q \ V m Et NI 01 � r .. , ,,....., g . . ....„,„... , 4,.. ., ,414 t. 4 -it f. • . - ° 5i.'. ,..::'''''.7 ",1 —.ill ---_________ .„,„.. ., ..,... ,-- . . OD,"",. ,"^. n .iii.,: Ica e 6 z y � o c4 Via. ,;'"�,, ., __,=....?,,, ,�r 1 4, ,p ..„ y. ♦ $( +(.. j oho 315 • Y „�, '� I :1/ r- s ". d H ':iYt1+3 Lem aa..y∎D iwovaifAZEil1IONU: iNG R.E.Cii ifZvliwu.4-Wiri o7:53C11.11.my ana 1f223 N4Ni L Cmeo J a July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3e. 2013 Priority Topics of Stakeholders and Suggested Table of Contents(submitted material dates as indicated) Page 1 of 12 May 14,2013 Clam Bay Committee of the Pelican Bay Services Division Board 3. Input from Clam Bay Stakeholders-Tim Hall's stakeholders summary Page 1 of 6 List of Stakeholders/Interested Parties: Community Associations: • Naples Cay Master Association—Brett Cohan, Edwin G. Saphar, Jr. • Pelican Bay Foundation—James Hoppensteadt, Suzanne Minadeo, Mary McLean Johnson, Robert Pendergrass • Pelican Bay POA—Bill Klaube, Ted Raia, Joanne Smith • Seagate POA—David Buser, Sarah Wu • The Seasons at Naples Cay Condominium Assoc.—Keith Tompkins, George E. Bergeron Conservation Groups: • Collier County Audubon—Brad Cornell • Conservancy of Southwest Florida—Andrew McElwaine, Kathy Worley • Mangrove Action Group—Ted Raia • Sierra Club—Marcia Cravens Commercial Entities: • Paradise Coast Paddlers Club—Jay Rose • Southwest Florida Paddling Club • Tall Tales Bait and Tackle • The Ritz-Carlton Naples • Waldorf Astoria Naples—Hunter Hansen, Donna Cox Government Agencies: • City of Naples—Michael R. Bauer, J.D., Ph.D. • Collier County Natural Resources—Bill Lorenz • Collier County Parks and Recreation—Maura Kraus, Barry Williams • Fla. Dept of Environmental Protection—Lucy Blair • Florida Fish& Wildlife Conservation Commission—Habitat& Species Conservation Div. • Florida Fish& Wildlife Conservation Commission—Boating& Waterways Sec. • National Marine Fisheries Service • South Florida Water Management District—Laura Layman • US Army Corps of Engineers—Tunis McElwain • US Fish and Wildlife Service Individuals: • Diane Solomon Brown & Stuart Brown • Anne Georger • Diane Lustig& Leon Lustig • Missy Travis • Pat Travis • Brandon Lampe • The Doyle Family—Sandra J. Doyle Page 347 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3e. 2013 Priority Topics of Stakeholders and Suggested Table of Contents(submitted material dates as indicated) Page 2 of 12 May 14,2013 Clam Bay Committee of the Pelican Bay Services Division Board 3. Input from Clam Bay Stakeholders-Tim Hall's stakeholders summary Page 2 of 6 List of Responders: Community Associations: • Naples Cay Master Association—Brett Cohan, Edwin G. Saphar, Jr. • Pelican Bay Foundation—James Hoppensteadt, Suzanne Minadeo, Mary McLean Johnson, Robert Pendergrass • Pelican Bay POA—Bill Klaube, Ted Raia, Joanne Smith • The Seasons at Naples Cay Condominium Assoc.—Keith Tompkins, George E. Bergeron Conservation Groups: • Conservancy of Southwest Florida—Andrew McElwaine, Kathy Worley • Mangrove Action Group—Ted Raia • Sierra Club—Marcia Cravens Commercial Entities: • Paradise Coast Paddlers Club—Jay Rose Government Agencies: • City of Naples—Michael R. Bauer, J.D., Ph.D. • Collier County Parks and Recreation—Maura Kraus, Barry Williams Individuals: • Diane Solomon Brown & Stuart Brown • Anne Georger • Diane Lustig& Leon Lustig • Missy Travis • Pat Travis • The Doyle Family—Sandra J. Doyle Page 348 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3e. 2013 Priority Topics of Stakeholders and Suggested Table of Contents(submitted material dates as indicated) Page 3 of 12 May 14,2013 Clam Bay Committee of the Pelican Bay Services Division Board 3. Input from Clam Bay Stakeholders-Tim Hall's stakeholders summary Page 3 of 6 Uses of the System Identified by Stakeholders: Anthropocentric: • Kayaking/Canoeing/Paddleboarding • Nature Appreciation/Bird Watching • Fishing • Boating • Swimming • Sunbathing • Shell Collecting Natural/Environmental: • Fish Habitat and Nursery • Flood Protection • Bird Rookery/Foraging Habitat • Manatee habitat • Water Quality filtering These are items specifically identified by stakeholder responses. The list is by no means all inclusive but it does indicate the importance of items as seen from stakeholder view points. Page 349 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3e. 2013 Priority Topics of Stakeholders and Suggested Table of Contents(submitted material dates as indicated) Page 4 of 12 May 14,2013 Clam Bay Committee of the Pelican Bay Services Division Board 3. Input from Clam Bay Stakeholders-Tim Hall's stakeholders summary Page 4 of 6 Concerns for the System Identified by Stakeholders: Concerns • Mangrove Health • Tidal Flushing o Over Dredging o Erosion • Water Quality/Pollution o Upstream Inputs o Copper • Seagrass Health • Idle Speed not Enforced o Jet-skis in system • Fish Populations • Shore nesting protection o Sea Turtles o Birds • Political instead of Science Based Decision Making o Emphasis on Recreation instead of Conservation • Loss of Benthic communities • All Stakeholders not treated equally This list is ranked in terms of the number of times an item was mentioned in stakeholder responses. Mangrove health was most often mentioned while stakeholder equality was the least mentioned. Page 350 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3e. 2013 Priority Topics of Stakeholders and Suggested Table of Contents(submitted material dates as indicated) Page 5 of 12 May 14,2013 Clam Bay Committee of the Pelican Bay Services Division Board 3. Input from Clam Bay Stakeholders-Tim Hall's stakeholders summary Page 5 of 6 Goals for the Management Plan as Identified by Stakeholders: Goals • Protect and maximize environmental health of the System o Improve native floral and faunal communities (biodiversity) o Keep areas natural o Address entire system • Keep Pass Open o As much as possible, assure that quality, quantity, and timing of salt and fresh water is correct to support and benefit the System o Maintain access o Protect fish hatchery • Protect Wildlife o Listed Species (sea turtles, fish, birds) • Minimize Dredging o Only do for health of System o Keep sand within the System (Do not haul away) o Not for beach renourishment(no sand mining) o Not for navigation • Improve Water Quality o Coordinate with developments to improve upstream inputs • Include Monitoring to establish basis for future decision making o Appropriate to goals and objectives of final Plan o Used as metrics to base success of management and maintenance activities. • Ensure long term solutions and sustainability wherever possible o Base activities and monitoring on best available science o Minimize impacts and protect System and people from incompatible uses • Protect Cultural Resources • Incorporate ability to respond quickly to emergencies (i.e. pass closures) • Clarify acceptable uses and restrictions within the System • Ensure stakeholder representation in formulation of plan and in any future revisions. • Make sure Plan is consistent with County and Agency overlays already in place. • Address funding for both long and short term management and maintenance activities This list is ranked in terms of the number of times an item was mentioned in stakeholder responses. Mangrove health was most often mentioned while funding concerns was the least mentioned. Page 351 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3e. 2013 Priority Topics of Stakeholders and Suggested Table of Contents(submitted material dates as indicated) Page 6 of 12 May 14,2013 Clam Bay Committee of the Pelican Bay Services Division Board 3. Input from Clam Bay Stakeholders-Tim Hall's stakeholders summary Page 6 of 6 • TURRELL, HALL & ASSOCIATES, INC. MARINE & ENVIRONMENTAL CONSULTING 3584 Exchange Avenue •Naples, Florida 34104-3732 • (239) 643-0166 • Fax (239) 643-6632 MEMORANDUM TO: Clam Pass Stakeholders FROM: Tim Hall DATE: May 10,2013 RE: Clam Pass Management Plan Stakeholders Meeting This memo is being sent to notify you that the Pelican Bay Services Division is hosting a stakeholder input meeting on May 23rd at Ipm at the Community Center at Pelican Bay- 8960 Hammock Oak Dr.,Naples FL 34108. Items to be discussed at the meeting will be input received to date from stakeholders as well as a discussion of the next steps for the updated Clam Pass Management Plan. Many thanks to those stakeholders that have provided comments. If you have any questions,or would prefer to have future notifications emailed to you instead of receiving them by mail please do not hesitate to contact Lisa Resnick by USPS or electronically at: The Pelican Bay Services Division do Ms. Lisa Resnick 801 Laurel Oak Dr, Ste 605 Naples, FL 34108 lresnick @colliergov.net We look forward to working with you. Page 352 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3e. 2013 Priority Topics of Stakeholders and Suggested Table of Contents(submitted material dates as indicated) Page 7 of 12 May 23,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board Purpose of the Clam Pass Inlet and Estuary Management Plan&Recommended Priorities (Submitted by Tim Hall,Turrell,Hall&Associates,Inc.) Purpose of the Management Plan The purpose of the management plan will be to provide guidance and direction for the management of Clam Pass and its associated estuary system by identifying the goals and objectives necessary to avoid or minimize impacts to the natural resources and biological integrity of the system. This plan will form the basis by which future management decisions can be made by identifying the appropriate management techniques necessary to preserve, enhance, restore, maintain and monitor the uses and resources within the system. The plan will attempt to balance resource protection with passive recreational use. It should consider Clam Pass monitoring and maintenance, restoration needs, water quality, listed species protection education and other issues as identified in the Plan's formulation process. The management plan shall be submitted to the Collier County Board of County Commissioners (BCC) for its approval. When approved,this plan will form the basis for future permitting and other management activities within the system. Page 1 of 3 Page 353 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3e. 2013 Priority Topics of Stakeholders and Suggested Table of Contents(submitted material dates as indicated) Page 8 of 12 May 23,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board Purpose of the Clam Pass Inlet and Estuary Management Plan&Recommended Priorities (Submitted by Tim Hall,Turrell,Hall&Associates,Inc.) Based on Stakeholder input received to date we would respectfully submit the following topics as priorities to consider in the formulation of the new Clam Pass Inlet and Estuary Management Plan. Protect and enhance environmental health of the System - Improve native floral and faunal communities (biodiversity)throughout entire system o Mangroves o Seagrasses o Dune o Benthic o Offshore Hardbottom - Maintain sufficient flow through the Pass to maximize benefits to the System o Minimize dredging to the least damaging practicable alternative • Not for navigation(by product only) • Not for beach nourishment(by product only) • Material compatible with beach should remain in the system • Disposal of incompatible beach material o Dredge only those areas necessary to achieve the flow benefits based on conditions at time of dredging • Historical basis • Modeling o Establish metrics to determine when dredging for system health is needed • Tidal • Survey • Biological - Improve Water Quality o Maintain flushing capability of the system through pass maintenance o Coordinate with upland developments to improve upstream inputs • BMPs to reduce surface water pollutant loading • Copper sulfate and other in-water treatments o Insure adequate freshwater inputs, quality and timing necessary for long- term conservation of the system - Protect Listed Species o Manatee o Sea Turtle o Gopher Tortoise o Smalltooth Sawfish o Shorebirds Page 2 of 3 Page 354 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3e. 2013 Priority Topics of Stakeholders and Suggested Table of Contents(submitted material dates as indicated) Page 9 of 12 May 23,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board Purpose of the Clam Pass Inlet and Estuary Management Plan&Recommended Priorities (Submitted by Tim Hall,Turrell,Hall&Associates,Inc.) - Address existing and historical recreational uses within the system o Fishing o Beach activities • Swimming • Sunbathing o Nature appreciation o Boating • Non-motorized • Motorized • Speed zone enforcement • Access issues to the north of the pass - Monitor System to insure health and success of management activities o Surveying • Pass • Tidal creeks o Biological • Mangroves • Seagrasses • Wildlife • Birds • Fish • Benthic communities o Tidal • Range • Phase Lag o Water Quality • Nutrients • Fecal coliforms • Dissolved Oxygen • Copper - Additional Items that should be addressed in the Management Plan o Educational Opportunities o Eco-tourism o Protection of Cultural Resources o Stakeholder Representation o Ability to modify Plan to take into account changing conditions or monitoring results Page 3 of 3 Page 355 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3e. 2013 Priority Topics of Stakeholders and Suggested Table of Contents(submitted material dates as indicated) Page 10 of 12 Management Plan Discussion Items 06/26/2013 Purpose of the Management Plan (DRAFT) The purpose of the management plan will be to provide guidance and direction for the management of Clam Pass and its associated estuary system by identifying the goals and objectives necessary to avoid or minimize impacts to the natural resources and biological integrity of the system. This plan will form the basis by which future management decisions can be made by identifying the appropriate management techniques necessary to preserve, enhance, restore, maintain and monitor the uses and resources within the system. The plan will attempt to balance resource protection with passive recreational use. It should consider Clam Pass monitoring and maintenance, restoration needs, water quality, listed species protection, education and other issues as identified in the Plan's formulation process. The management plan shall be submitted to the Collier County Board of County Commissioners (BCC) for its approval. When approved, this plan will form the basis for future permitting and other management activities within the system. Page 356 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3e. 2013 Priority Topics of Stakeholders and Suggested Table of Contents(submitted material dates as indicated) Page 11 of 12 Management Plan Discussion Items 06/26/2013 Table of Contents (DRAFT) INTRODUCTION PURPOSE AND SCOPE OF MANAGEMENT PLAN MANAGEMENT PROGRAM OVERVIEW Management Authority and Responsibilities Management Coordination Location and Regional Significance Public Involvement RESOURCE DESCRIPTION AND ASSESSMENT Natural Resources - Physiography - Climate - Plant Communities - Plant Species - Animal Species - Listed Species - Exotics Cultural Resources HISTORICAL OVERVIEW NRPA GOALS AND OBJECTIVES Provide sufficient tidal exchange to maximize benefits to the estuary Maintain and protect native floral and faunal communities Improve water quality Address recreational uses with emphasis on passive recreation LITERATURE CITED APPENDICES (+others as needed) Maps and Figures Plant Species List(s) Animal Species List(s) Managing Documents Permits MAPS (+others as needed) Location Map Vicinity Map Topographic Map Soils Map Natural Communities (FLUCFCS)Map Page 357 of 358 July 16,2013 Clam Bay Subcommittee of the Pelican Bay Services Division Board 3e. 2013 Priority Topics of Stakeholders and Suggested Table of Contents(submitted material dates as indicated) Page 12 of 12 July 10,2013 Pelican Bay Services Division Board Regular Session 7ai. Clam Bay Committee Report-Clam Bay Management Plan Update Page 1 of 1 ry TURRELL, HALL & ASSOCIATES, INC. MARINE& ENVIRONMENTAL CONSULTING 3584 Exchange Avenue, Suite B • Naples, Florida 34104-3732 • (239)643-0166 • Fax(239) 643-6632 MEMORANDUM TO: Susan O'Brien FROM: Tim Hall DATE: July 3,2013 RE: Management Plan Estimated Costs Susan, Per your request at the June 26, 2013 Clam Bay Subcommittee meeting, below is the written summary of the estimated costs I had outlined at the meeting. Items already collected/provided in the annual monitoring and reporting - Mangrove monitoring o 20 monitoring plots o Annual infrared aerial photo interpretation o Quarterly rooftop photographs o Flushing(hand dug) channel inspection and maintenance - Seagrass monitoring o 9 Transects from Outer Clam Bay to Pass - Tidal and Hydrographic Monitoring and Survey - Water quality monitoring o PBSD monthly collection o Quarterly summary and annual report Items Identified for inclusion through the stakeholder input or required for document - Wildlife Surveys o Birds ($2,000 - $28,000) o Fish($9,000- $10,000) (Based on same survey as in 1995 Draft Inlet Management Plan) o Terrestrial (Gopher Tortoises, Mammals, etc) ($5,000) - Engineering Backup (Justification for final dredge template) ($30,000) - Document compilation, Write-up and Exhibits for Plan($35,000 - $40,000) - Surveying($15,000) - Meetings ($8,000 - $10,000) Permitting -We are estimating a minimum value of$40,000 for the permitting but that could go much higher depending on final scope of the project, agency requests for additional information, or outside challenges to the permit. Page 358 of 358 y _x TURRELL, HALL & ASSOCIATES, INC. F �nx`G'a+� , s yr MARINE&ENVIRONMENTAL CONSULTING 3584 Exchange Avenue,Suite B•Naples,Florida 34104-3732•(239)643-0166•Fax 643-6632•marielle @turrell-associates.com April 18,2013 Pelican Bay Services Division Mr.Kyle Lukasz 801 Laurel Oak Drive, Suite 605 Naples,FL 34108 Re: Proposal for Professional Environmental Services Quarterly Water Quality Data Entry,Analysis and Reporting Dear Mr.Lukasz: Turrell, Hall &Associates,Inc. is please to provide you with this proposal for environmental services. It is our understanding you would like for us to continue the quarterly water quality sampling we began in 2011 for The Pelican Bay Foundation throughout the Pelican Bay lake system and provide quarterly reporting on collected data. Our scope of services for this monitoring is found below. I have also included a price option for you to collect the data and provide it to us for entry and analysis. Data Collection: • Option 1: Quarterly water quality data entry from samples collected by PBSD(using the same collection stations as designed by Turrell for The Pelican Bay Foundation) $2,200/Qtr or$8,800/Yr • Option 2: Continue quarterly water quality sampling using existing Turrell sampling locations previously designed for Pelican Bay Foundation,with the addition of two (2)more locations from PBSD and data entry ..$5,080/Qtr or$20,320/Yr Data Lab Analysis: • Quarterly Lab Analysis for water quality sampling .Estimated$6,800/Qtr or$27,200/Yr Reporting: • Quarterly data analysis and reporting $2,500/Qtr or$10,000/Yr TOTAL Option 1-$46,000.00/Year or Option 2-$57,520/Year Please feel free to contact us with any questions Sincerely, 1 Marielle Kitchener Operations Manager C5 L! u u u 1i By ORDINANCE NO.2013 - 19 AN ORDINANCE OF THE BOARD OF COUNTY COMMISSIONERS OF COLLIER COUNTY,FLORIDA,AMENDING ORDINANCE NO. 2002-27, AS AMENDED, WHICH CREATED THE PELICAN BAY MUNICIPAL SERVICE TAXING AND BENEFIT UNIT, BY AMENDING SECTION FOUR, PURPOSE; POWERS; SECTION SEVEN, CREATION OF THE PELICAN BAY MUNICIPAL SERVICE TAXING AND BENEFIT UNIT ADVISORY COMMITTEE KNOWN AS THE PELICAN BAY SERVICES DIVISION BOARD; SECTION EIGHT, COMPOSITION, NOMINATION AND APPOINTMENT; AND SECTION ELEVEN,OFFICERS; QUORUM; RULES OF PROCEDURE; PROVIDING FOR CONFLICT AND SEVERABILITY; PROVIDING FOR INCLUSION IN THE CODE OF LAWS AND ORDINANCES; AND PROVIDING FOR AN EFFECTIVE ., DATE. . WHEREAS, on May 28, 2002, the Board of County Commissioners (Board), adapted . Ordinance No. 2002-27, which superseded, repealed, and consolidated prior ordinances relating , i vi to the Pelican Bay Municipal Service Taxing and Benefit Unit("Unit"); and - WHEREAS, the Board subsequently amended Ordinance No. 2002-27 •adnpting ry Ordinance No. 2006-05 and Ordinance No.2009-05;and WHEREAS, the Board desires to further amend Ordinance No. 2002-27, as amended, in order to clarify that the Unit will be solely responsible for advising the County on dredging and maintaining Clam Pass for the purpose of enhancing the health of the affected mangrove forest and will manage such activities for the County; to add a non-voting member recommended by the Pelican Bay Foundation;and to create a system of rotating officers for the Unit. NOW, THEREFORE, BE IT ORDAINED BY THE BOARD OF COUNTY COMMISSIONERS OF COLLIER COUNTY,FLORIDA,that: SECTION ONE: AMENDMENT TO SECTION FOUR OF ORDINANCE NO. 2002-27, AS AMENDED. Section Four is hereby amended as follows: SECTION FOUR: Purpose; powers. The Unit is formed for the purpose of providing street lighting, water management, ambient noise management, extraordinary law enforcement service and beautification, including but not limited to beautification of recreation facilities, sidewalk, street and median areas, identification markers, the maintenance of conservation or preserve areas including the restoration of the mangrove forest preserve and to finance the landscaping beautification of only Words Underlined are added;Words Struck—Through are deleted. Page 1 of 4 �kAI ) by/M 'R Cvetile� s 'Ili/ li that portion of U.S. 41 from Pine Ridge Road to Vanderbilt Beach Road in the above-described taxing and benefit unit and to that end shall possess all the powers to do all things reasonably necessary to provide such services. The Unit will be solely responsible for advising the County on dredging and maintaining Clam Pass for the purpose of enhancing the health of the affected mangrove forest,and will manage such activities for the County. SECTION TWO: AMENDMENT TO SECTION SEVEN OF ORDINANCE NO. 2002-27,AS AMENDED. Section Seven is hereby amended as follows: SECTION SEVEN: Creation of the Pelican Bay Municipal Service Taxing and Benefit Unit Advisory Committee Known as the Pelican Bay Services Division Board. Concurrent with the passage of the Ordinance, an 11 member advisory committee to be known as the Pelican Bay Services Division Board (PBSD Board) is hereby created. Those individuals who are members of the PBSD Board pursuant to Collier County Ordinance No. 90- 111,as amended,as of the moment prior to the effective date of this Ordinance,shall continue on as members of the PBSD Board until March 31st of the year in which their term would have expired as set forth in the prior ordinances, and shall continue to hold over and serve in that capacity until their position is filled as provided for in this Ordinance. In addition,there shall be 1 non-voting member nominated by the Pelican Bay Foundation in the manner set forth below. This non-voting member shall not be subject to the voting requirements set forth below. SECTION THREE: AMENDMENT TO SECTION EIGHT OF ORDINANCE NO. 2002-27,AS AMENDED. Section Eight is hereby amended as follows: SECTION EIGHT: Composition,nomination and appointment. A) The PBSD Board shall be representative of the residential, business and commercial interests and landowners in Pelican Bay. To that end, nine of the PBSD Board members shall be representative of the residential interests within the Unit and two of the PBSD Board members shall be representative of the commercial and business interests within the Unit. The non-voting member shall be recommended for appointment by the Pelican Bay Foundation. The non-voting member should be an individual who is not related to and who is independent of the other Board members and County employees, with no apparent conflict of interest or appearance of impropriety. Members of the PBSD Board shall be appointed by and serve at the pleasure of the Board of County Commissioners pursuant to the procedure outlined herein. The nine (9) PBSD Board members representative of the residential interests within the Unit, and the non-voting member recommended for appointment by the Pelican Bay Foundation,shall be residents of and qualified Words Underlined are added;Words Stmsl-Through are deleted. Page 2 of 4 electors within the Unit. The two PBSD Board members representative of the commercial/business/other interests shall be residents of and qualified electors in Collier County. ********** SECTION FOUR: AMENDMENT TO SECTION ELEVEN OF ORDINANCE NO. 2002-27,AS AMENDED. Section Eleven is hereby amended as follows: SECTION ELEVEN: Officers;quorum;rules of procedure. A) At its earliest opportunity, the membership of the PBSD Board shall elect a chairman and vice chairs from among the those members willing to serve. Officers' terms shall be for one year, with no eligibility for re-election. Officers' terms are to be on a rotating basis. Immediately following the election of a new Board,a new chair and vice-chair shall be elected. ********** SECTION FIVE: CONFLICT AND SEVERABILITY. In the event this Ordinance conflicts with any other ordinance of Collier County or other applicable law,the more restrictive shall apply. If any phrase or portion of the Ordinance is held invalid or unconstitutional by any court of competent jurisdiction,such portion shall be deemed a separate, distinct and independent provision and such holding shall not affect the validity of the remaining portion. SECTION SIX: INCLUSION IN THE CODE OF LAWS AND ORDINANCES. The provisions of this Ordinance shall become and be made a part of the Code of Laws and Ordinances of Collier County, Florida. The sections of the Ordinances may be renumbered or relettered to accomplish such, and the word "ordinance" may be changed to "section," "article," or any other appropriate word. SECTION SEVEN: EFFECTIVE DATE. This Ordinance shall be effective upon filing with the Department of State. Words Underlined are added;Words Struck Through are deleted. Page 3 of 4 {(113 fit' IS II III 1P tnll PASSED AND DULY ADOPTED by a vote of a majority plus one of the Board of County Commissioners of Collier County, Florida,this ZZraflay ,2013. ATTEST:, BOARD e - COUNTY COMMISSIONERS •AAVI HT. 43ROCK, Clerk COLLI • 0 TY,F' ORIDA • By: , I • rk GE'TWA t�A 7 'ILLER, ESQ. . ik+tes a!''to dla�� 4� CH• RWOMAN •44g08 AA'e )Et-.4 Approved as to form and lega su iency: tha Jeffr. • . ' latzkow Coun _-ttorney This ordinance filed with the Secretary o 4Ste s pf ice the °y --- and acknowledgemenJ�.ptLthat filin received this ato t3�`"��ddOy of By flwu+v cNsr Words Underlined are added;Words Srough are deleted. Page 4 of 4 STATE OF FLORIDA) COUNTY OF COLLIER) I, DWIGHT E. BROCK, Clerk of Courts in and for the Twentieth Judicial Circuit, Collier County, Florida, do hereby certify that the foregoing is a true and correct copy of: ORDINANCE 2013-19 which was adopted by the Board of County Commissioners on the 22nd day of January, 2013, during Regular Session. WITNESS my hand and the official seal of the Board of County Commissioners of Collier County, Florida, this 28th day of January, 2013 . DWIGHT E. BROCK Clerk of Courts and Clerk Ex-officio to Board of County Commissioners •'Z' . '> y: Teresa Cannd ;. Deputy Clerk-Y . ` _�'