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Agenda 05/14/2014 PELICAN BAY SERVICES DIVISION Municipal Service Taxing and Benefit Unit NOTICE OF PUBLIC MEETING WEDNESDAY, MAY 14, 2014 THE CLAM BAY COMMITTEE OF THE PELICAN BAY SERVICES DIVISION WILL HOST A WORKSHOP WEDNESDAY, MAY 14, 2014 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. Agenda Approval 3. Audience comments 4. Discussion of the final draft of the Clam Bay Management Plan 5. Other 6. Adjourn ANY PERSON WISHING TO SPEAK ON AN AGENDA ITEM WILL RECEIVE UP TO ONE (1) MINUTE 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. • , ' .'.' , - . •. !„.,-.-i A,•i.- C,..2 vie ir -D,,,_,,,,p,. \Lk \ 1,:,-,,, -,-,:;::.411K. VralLA: ,'ftel.-t i2tc--44-\11-7"1 ' . • • . . ' '7 • ,'"*" LiLt31/CLI)r i (2! 111J It " KaTFVULI U 1 ... 1 1, t-`i '-' (... ':' ./n'.'• i (,:::' . 7 I I . . \ ! '`.•, 1, --. . . 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(C ( &•.ii (1.-i: 2.:S.- CLAM BAY MANAGEMENT PLAN DRAFT Dated May 1, 2014 Version 5.0 PREPARED BY: TURRELL HALL&ASSOCIATES,INC 3584 EXCHANGE AVENUE NAPLES,FL 34104 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Table of Contents List of Figures- 1 List of Tables: 1 Acronym Key 2 1.0 Introduction 3 Purpose of the Clam Bay NRPA Management Plan 3 Development of the Clam Bay NRPA Management Plan 3 Role of the Pelican Bay Services Division 5 2.0 Overview of the Clam Bay NRPA 7 Description of the System 7 Adjacent Communities 9 Natural History 10 Historical Overview 10 Mangrove Die-off and Restoration 11 Timeline of Important Events Within the Clam Bay System 11 Timeline Specific to the Establishment of the Clam Bay NRPA 17 3.0 Resource Description and Assessment 19 Soils 19 Topography 20 Climate 21 Temperature 22 Precipitation 22 Winds 22 Sea breeze 23 Storms 23 Waves 25 Natural Communities 26 Invasive, Non-native and Problem Species 47 Listed Species 48 Other Species 52 Hydrology 60 1 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Freshwater Component 62 Water Quality 64 Archaeological Resources 67 Inlet Dynamics 67 Recreational Use 69 4.0 Authorized Construction Activities 71 List of Permits for Work Undertaken to Date and Relevant Legal Framework 71 Permit Details 72 5.0 Management Plan Goal and Supporting Objectives 77 Objective 1 —Maintain and protect the native floral and faunal communities within the Clam Bay NRPA 78 Objective 2—Ensure the estuary has adequate tidal and freshwater flows to maintain ecological health within the Clam Bay NRPA 79 Objective 3 — To monitor and maintain water quality within the Clam Bay NRPA 79 Objective 4—Monitor archaeological sites within the Clam Bay NRPA 80 Objective 5 —Ensure recreational activities are safe and environmentally compatible within the Clam Bay NRPA 80 6.0 Factors to Consider for Dredging of Clam Pass 82 Monitoring Clam Pass 82 Bay Tide Range 82 Cross Section of Flow Area and Volume of Shoaled Material 83 Inlet Channel Length 87 Ebb Shoal 88 Typical Cross Sections for Dredging 89 Clam Bay NRPA Management Plan Amendments 91 Clam Pass Management Plan Stakeholders Groups and Review Agencies 92 Appendix 1 1 Appendix 2 2 Appendix 3 3 Exhibits 4 Clam Bay NRPA Management Plan Bibliography 5 2 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 List of Figures: - Figure 1 —Approximate extent of Clam Bay NRPA Boundary—Page 6 - Figure 2—Historic Aerials—Page 10 - Figure 3 — Soils map of the Clam Bay NRPA—Page 17 - Figure 4—LIDAR Map of the NRPA Boundary—Page 18 - Figure 5 —Wind and Wave Rose—2006—2013 - Figure 6—Wind and Wave Rose- 2013 - Figure 7—Beach habitat within the NRPA Boundary—Page 24 - Figure 8—Coastal Scrub habitat within the NRPA Boundary—Page 26 - Figure 9—Cabbage Palm Hammock habitat within the NRPA Boundary—Page 26 - Figure 10—Historic aerials of the location of Clam Pass—Page 30 - Figure 11—Open Water habitat within the NRPA Boundary—Page 31 - Figure 12—Mangrove habitat within the NRPA Boundary—Page 35 - Figure 13 —Salt Marsh habitat within the NRPA Boundary—Page 36 - Figure 14—Tidal Flat habitat within the NRPA Boundary— Page 37 - Figure 15 — Seagrass habitat within the NRPA Boundary—Page 37 - Figure 16—Oyster locations within the NRPA Boundary—Page 42 - Figure 17—Exhibit from Conservancy of Southwest Florida report—Page 46 - Figure 17—Hardbottom Community offshore of the NRPA Boundary—Page 48 - Figure 18—Approximate locations of Drainage Basins within the Pelican Bay—Page 65 - Figure 19—Water Quality monitoring locations within the NRPA Boundary—Page 67 List of Tables: - Table 1 — 1981-2010 Temperature and Precipitation Normals Graph—Page 19 - Table 2 — 1981 —2010 Temperature and Precipitation Normals Graph—Page 20 - Table 3 —Number of Named Storms Passing Through or near Naples—Page 21 - Table 4—List of FLUCFCS Communities within the Clam Bay NRPA—Page 22 - Table 5 —Plant Species found within the NRPA Boundary—Page 49 - Table 6—Aquatic Invertebrates found within the NRPA Boundary—Page 50 - Table 7—Fish Species found within the NRPA Boundary—Page 50 - Table 8 —Reptile and Amphibian species found within the NRPA Boundary- Page 52 - Table 9—Bird Species found within the NRPA Boundary—Page 53 - Table 10—Mammal Species found within the NRPA Boundary—Page 56 1 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Acronym Key BCC Collier County Board of County Commissioners CBRMP Clam Bay Restoration and Management Plan CBRS Coastal Barrier Resources System Cu Copper DA Department of Army DHR Division of Historical Resources DNR Department of Natural Resources DO Dissolved Oxygen ESA Endangered Species Act FDEP Florida Department of Environmental Protection FDER Florida Department of Environmental Regulations FLEPPC Florida Exotic Pest Plan Council FLUCFCS Florida Land Use, Cover, and Forms Classification System FSU Florida State University FWC Florida Fish and Wildlife Conservation Commision FWS Fish and Wildlife Service LIDAR Light Detecting and Ranging MGD Millions of Gallons/Day MSTBU Municipal Services Taxing Benefit Unit N Nitrogen NMFS National Marine Fisheries Service NOAA National Oceanic and Atmospheric Administration NRCS National Resource Conservation Services NRPA Natural Resource Protection Area PBID Pelican Bay Improvement District PBSD Pelican Bay Services Division PUD Planned Unit Development ST Sensitive Treatment TDS Total Dissolved Solids TMDL Total Maximum Daily Load USACE U.S.Army Corps of Engineers USDA United States Department of Agriculture USFWS U.S. Fish and Wildlife Service WBID Water Body Identification WCI Westinghouse Communities Inc. 2 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 1.0 Introduction Purpose of the Clam Bay NRPA Management Plan The purpose of this management plan is to provide guidance and direction for the management of the Clam Bay Natural Resource Protection Area(NRPA). This plan will form the basis by which future management decisions can be made by identifying the appropriate management techniques necessary to protect,preserve,maintain, and monitor the natural resources and their uses within the Clam Bay NRPA. This plan, in addition to providing a brief historical perspective of activities undertaken within this system,will identify management goals and objectives; develop methods to achieve these goals and objectives; and develop implementation, assessment, and evaluation strategies that strive to balance resource protection with recreational use. While the 1998 Clam Bay Restoration and Management Plan (1998 Management Plan) focused on mangrove health and recovery, this plan will address all floral and faunal components of the NRPA, not just the mangroves. The plan will draw from the 1998 Management Plan, input from multiple interested stakeholders, and the findings of 15 years of biological and hydrographic monitoring activities within the system to outline goals and objectives for future management and maintenance of the ecosystems throughout Clam Bay. The 2014 Clam Bay NRPA Management Plan(Management Plan) and any subsequent revisions recommended by the Pelican Bay Services Division(PBSD) shall be submitted to the Collier County Board of County Commissioners (BCC) for approval. Once approved by the BCC and relevant regulatory agencies, this Management Plan, or future amended plans, will supersede all others and will serve as the primary guidance tool for future permitting and other management activities necessary to protect,preserve, maintain, and monitor resources within the system. Development of the Clam Bay NRPA Management Plan Turrell,Hall &Associates, Inc. served as the principal consultant for the Management Plan. This consultant firm has a long history of work in the Clam Bay NRPA and was responsible for the implementation of the 1998 Management Plan that resulted in the successful restoration of Clam Bay's mangrove forest. The coastal engineering firm of Humiston &Moore, Inc. provided input and monitoring data for the 2014 Management Plan relative to Clam Pass and the dredging activities and templates. The PBSD Clam Bay Committee consists of members of the PBSD Board, which is an advisory board to Collier County's Board of County Commissioners. The Clam Bay Committee met regularly in 2013 and 2014 and provided input and direction to the consultants. Additional regular input was provided by representatives of the Conservancy of Southwest Florida, The Mangrove Action Group, and the local Calusa Group of the Sierra Club. All Committee and Board meetings were properly noticed, open to the public, and allowed audience participation. Input was also solicited via notices to more than 30 area businesses, government officials and employees, condominium associations, and 3 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 individuals who regularly use Clam Bay. These representatives were invited to participate in two meetings held in the spring of 2013. Many have attended and provided comments at the periodic meetings of the PBSD Clam Bay Committee where drafts of the Management Plan have been discussed. Stakeholders were also notified in April 2014 that a draft of the Management Plan was available on the PBSD's website and they were invited to send their comments to the PBSD's office and/or attend a workshop about the Clam Bay NRPA Management Plan on May 14, 2014. A list of these area people/organizations is included with this Management Plan(pages 92 and 93). Pelican Bay Services Division Turrell, Hall &Associates, Inc. Chairman Tim Hall—Project Manager 801 Laurel Oak Drive, Suite 302 3584 Exchange Avenue Naples, Florida 34108 Naples, Florida 34104 (239) 597-1749 (239) 643-0166 Humiston&Moore Engineers Brett Moore—Project Manager Mohammed Dabees—Project Engineer 5679 Strand Court Naples, Florida 34110 (239) 594-2021 4 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Role of the Pelican Bay Services Division In order for the management and maintenance of the Clam Bay NRPA to be successful, coordination between a myriad of local, state, and federal agencies and concerned citizens groups is required. The PBSD has undertaken that role for most of the past fifteen years. The PBSD is a dependent special district known as the Pelican Bay Municipal Services Taxing and Benefit Unit (MSTBU). It was formed pursuant to Chapter 125 of the Florida Statutes and was formally enabled by the BCC pursuant to Ordinance numbers 90-111 and 91-22. These ordinances were replaced in 2002 by Ordinance 2002-27 which further clarified the role of the MSTBU and the PBSD Board. This MSTBU was created to, among other things,provide for the maintenance of conservation and preserve areas within Pelican Bay. This responsibility was undertaken diligently from 1998 to 2009 and resulted in the implementation of the previous 1998 Management Plan and the recovery of the mangrove die off areas. Per action by the BCC the responsibility for many of the monitoring and maintenance activities associated with Clam Bay was given to Collier County's Coastal Zone Management Department from 2009 to 2012. In 2013, the BCC returned responsibility for the monitoring and maintenance of the system to the PBSD via Ordinances 2013-19 and 2013-61. It is under the PBSD's direction that this current management plan has been written. While the MSTBU is a dependent special taxing and benefit district,the PBSD is an arm of Collier County government and makes recommendations to the BCC. The PBSD implements its defined responsibilities within the Pelican Bay community; sets its own budget and agenda, and regularly submits them to the BCC for approval. The BCC has regularly approved the Clam Bay management activities and authorized the development of this Management Plan. The PBSD's effective working relationship with the BCC is expected to continue as the PBSD serves as the official manager of the 2014 Management Plan which is consistent with Ordinances 90-111, 2002-27, 2013-19 and 2013-61 of Collier County. The PBSD will direct the Management Plan and has the responsibility for its implementation and operation over time. As such, the PBSD will plan and implement defined management activities with BCC approval whose purpose will be to protect, preserve, maintain, and monitor the natural communities and ecological integrity of the Clam Bay NRPA. The PBSD has several attributes which already make it a logical guiding force in the management and maintenance of Clam Bay. The PBSD: • is located within the Clam Bay drainage basin; • has an advisory board made up of residential and business members within Pelican Bay; • garners fiscal support collected from local special assessments (non ad valorem taxes); • is accessible to the public due to its local governing board and advertised public monthly meetings; and 5 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 • has demonstrated a long term commitment to the Clam Bay NRPA and a successful track record regarding its preservation, restoration and maintenance over the past fifteen years. These attributes give PBSD the knowledge and expertise in matters of local concern and, in particular, the problems, opportunities, and interests of local residents as they relate to the Clam Bay ecosystem. Its relationship with the BCC gives it an additional level of access to technical expertise and oversight that will be necessary to assure that the Management Plan, as contemplated in this document, is fully implemented in the field. As part of its responsibilities, the PBSD will assemble and distribute various technical reports and assessments as required under the Management Plan, as well as coordinate with other public and private groups interested in Clam Bay. The PBSD is organized for and designed to maintain both its knowledge of the Clam Bay resources and to generate public support of the same. The PBSD will insure that the general public, residents in Pelican Bay, the PBSD consultants, and representatives from the government agencies with jurisdiction over Clam Bay each have on-going involvement and input into the Management Plan is appropriate. 6 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 2.0 Overview of the Clam Bay NRPA Description of the System The Clam Bay NRPA is a 570-acre estuarine system consisting of sandy beaches, shallow bays and creeks, seagrass beds, mangrove forests, and Clam Pass on the west coast of Collier County in Southwest Florida. The Clam Bay system is part of the Cocohatchee-Gordon River Transition referred to by the Collier County Department of Natural Resources as Coastal Zone II. It is one of the few remaining estuarine systems in the Cocohatchee-Gordon River Drainage System. Aerial photographs (see attached Exhibits) taken prior to the construction of Vanderbilt Beach Road show that the Clam Bay System was connected to Wiggins's Pass to the north via a system of mangrove swamps and shallow creeks with intermediate open water areas that were excavated and are now known as Vanderbilt Lagoon(Collier County, 1994, Tropical Biolndustries, 1978). It is recognized that the connection was marginal at best and while passable at times, it was not uniformly and consistently navigable(Clam Bay Restoration and Management Plan, 1998). Similarly, aerial photos of the Seagate Drive area taken prior to its construction show that Outer Clam Bay was connected to the mangrove swamps to the south via shallow meandering creeks and intermediate open waters leading to Doctors Pass. These creeks were only navigable by canoes and small skiffs (Turrell, 2009). These swamps to the south were eventually excavated to become Venetian and Moorings Bays. Today, the Clam Bay NRPA includes three primary bays, Outer Clam Bay(southernmost), Inner Clam Bay(central), and Upper Clam Bay(northernmost), connected by a series of tidal creeks and connected to the Gulf of Mexico by Clam Pass. The community of Pelican Bay abuts the northern and eastern edges of the system, while Seagate and Naples Cay communities abut the southern portion of the system. This system is an important natural and recreational resource for local residents and visitors. The operation of motorized watercraft has been limited to idle speed/no wake per Collier County Ordinance 96-16. This ordinance is no longer consistent with Florida Statutes, therefore the PBSD is currently undertaking the modification of the ordinance to be consistent with current state statutes and Florida Fish and Wildlife Conservation Commission(FWC) guidelines. The Clam Bay system was designated a Natural Resources Protection Area(NRPA)by Collier County in 1995. The purpose of the NRPA designation is to protect endangered or potentially endangered species and to identify large connected intake and relatively unfragmented habitats, which may be important for listed species(Collier County, 1994). See the NRPA timeline(starting on page 15) later in this report for more details on the NRPA history. 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 of Clam Pass were -2.5' to -1.0', and its width ranged from 30-50' (Collier County, 1994). The Pass remains the primary source of tidal exchange for the 7 CLAM BAY NRPA MANAGEMENT T) Pelican Bay ServicesPLAN Divis(DRAFion May 1, 2014 Ver. 5.0 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. LAGOON n T. , L wF., E}.Y I �- 7.1 y�Fr}+"q4 fa}�?R, r a Pc; +�, �� L /� 5'fir, t e..-414.4k,f> "T"R:ri,Ae�•, r.- 1 `• ' ' .z l 7 y 41"'d ar iii 5'i: i s 1 �- -1: . . .4 1 BAY 1.:* ,tit- :n! `1 19 SI�y�PA�1 �x i TT { 9 i - 9 • j- '' 4 • .� p ✓.1 1 `4 ice, al .ate'+. ..."'+' J Ge R� ti ‘.;;k : r . 1A-Nl i. ,ti +f.'.(,".1 , rt;" C t 4,4,,,...'-• a -ri ,' r G o;= f+� �,h,SAIL ►sir`7.. .alk '1 R,-. '' d. .# 7,,_ ,,X' •,) INNER ,�e � ., { 1' `• PO g 'Al !FnF CLAM � } A."'-1 tf.e I� \',L,',. 0}0 w r ti�t': BAY �S' �d'ec 'J - 0. 1. }4.'s a 0* ��iiSaa ",''Ai GL- �' til 7 ( ���9a ,i. ,.,1,,,,1--_---,...1 M ."Y:' 4 SA ti.. /4 1k y1 :, leg i.�i /a,..,`,1,4, i �-1.- l' ' ;, kr aVir;-,,:. -,.';.;:'••-tiki:;-.q'i.;,,,,,,.x?,:-.--tli-M.',t. �� r f ' 3 . 1 7 • Vii, �� 7 R CLAM .„1„:0,.0.1.,\01.•&,...“...L ( ` ''# ! 1 .i ligi? ir1m at l • .y�.r<< ti qac � ` a..,3,-.f....1.•,.-i" [I COLLIER COUNTY .. Y 03" 1_.. s ....T.3.' r fi+ ,, 11 r ,.iT' I - BEACH PARK ^:..' Ys' .t l'C' Imo .r F 117 " f OUTER �ri,..z '. ,..4 ..� '4}r;�it I + �� •"1 CLAM _at` f�:• I� ;�ttrJr '�` It. ,1=i I c, `� ' . BAY _ _ eR 1A- , I' !-: q� S „. t'e7it0„ 11Iy ,$mow€k , }h}�er:!i�'tj,%.„ ^ . i. NAPLES R�". •• _ 1 ' Q 1 CAY it aid a t :Q t n e., ( I .r"-#''..t A :.+� al- Figure 1:Approximate extent of Clam Bay NRPA boundary. Clam Bay NRPA Vital Statistics Total acres: Approx. 570 acres Beaches: Approx. 5,000 feet Beach Park: Approx. 35 acres 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 Water Body Identification(WBID) 3278Q1 8 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Adjacent Communities The Clam Bay system is bound on the north by Vanderbilt Beach Road and the Bay Colony portion of the Pelican Bay development; to the south by Seagate Drive, and the Seagate and Naples Cay developments, to the east by the Pelican Bay development; and to the west by the Gulf of Mexico and the Strand neighborhood of the Pelican Bay development. Pelican Bay is predominately a residential community consisting of private single family homes, villas, and both high and low-rise condominium units. The community also includes a 27-hole golf course, common areas with meeting rooms,tennis courts, beach park facilities, emergency services facilities, and commercial areas with shopping and hotels. The 2,104-acre Planned Unit Development(PUD) was approved in 1977 as a partnership between Collier Enterprises and Westinghouse Communities (WCI). It was one of the first developments in Florida required to save fragile coastal wetlands and associated ecosystems (Urban Land Institute, 1981). The development of Pelican Bay had a limited impact on the wetlands themselves with approximately 94 acres, including about 78 acres in the northwestern corner of the property being developed. This left the majority of the mangrove forest intact and preserved around the bays. As mitigation for these wetland impacts, the 570 acre preserve area, including the 35 acre beach park, was donated to Collier County and eventually became the NRPA which is in place today. Development of Pelican Bay required a stormwater management system designed to spread runoff along the eastern edge of the Clam Bay estuary. 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 Clam Bay. The eastern edge of Pelican Bay is about 12-14 feet above sea level at US 41, sloping in an east-west direction to about 2 feet above sea level near the berm. Six drainage basins operate on a gravity system to slowly move surface water into the receiving area of Clam Bay. Naples Cay is a high rise development consisting of 8 multi-story condominium buildings. The community also includes pools, tennis courts, approximately 33 acres of park and preserve areas, and two canoe and kayak launching piers. Construction on the first building in Naples Cay started in the late 1970's, and the last building was completed in 2002. Stormwater management is accomplished through several internal detention areas before water flows in to Outer Clam Bay. The Seagate community is composed of about 80 single family residences. The community was first laid out in the 1950's and still has a few undeveloped lots. Because development of this community occurred so early, there was no community-wide stormwater system. More recent improvements to the road and utility systems have allowed for some dry retention and sewerage improvements to be put in place. Many of the homes within Seagate were built with boat docks along the community's man- made canals. Some homeowners keep motorized vessels at these docks. The 1995 Manatee Protection Plan acknowledges that access and use of Clam Bay was limited due to the shallow nature of the bay and ephemeral conditions. Vessels are generally shallow drafted and their access is limited by the day to day conditions of the Pass and connecting waterway. 9 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Clam Pass Park is a 35-acre County park providing beach access on the south side of Clam Pass. The Park is wholly contained within the NRPA boundary. Access to the Park is via a boardwalk through the mangroves from the parking lot at the very southern end of Pelican Bay. Operation and care of the Park is done under the supervision of the Collier County Parks and Recreation Department. Through an agreement between the County and the Waldorf Astoria Hotel, much of the day-to-day operation of the park is managed by the hotel. Natural History Prior to the development the entire coastline of South Florida would have resembled the Clam Bay ecosystem with meandering mangrove-lined shallow waterways buffering sandy barrier islands and natural terrestrial communities. Unique within the heavily developed coastal communities of Collier County,the Clam Bay estuarine system is a valuable resource for wildlife(particularly juvenile marine species and birds) as well as residents and visitors to the area who enjoy the low-impact recreational opportunities the system offers such as photography, canoeing, kayaking, paddleboarding, fishing, walking, swimming,bird watching, and beach going. 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. It 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) and approximately 1.5 miles of sandy beach. 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 in the Resource Description Section(Section 3.0) of this Management Plan. Historical Overview Historically, Clam Pass was a small part of a large system of relatively shallow waterways and interconnecting wetland communities extending from Lee County to Doctor's Pass. Anecdotal evidence suggests that canoes and shallow drafted skiffs were used within many of these interconnected areas. Within the Clam Bay system, four Indian shell mounds have been identified and listed on the Florida Master Site Inventory as Clam Bay Shell Ridge, Inner Clam Bay Shell Mound, Brackish Hammock and Bayhead Camp (Hartwell, et al, 1994). During the 1950's this system was isolated from adjacent mangrove lined creeks and bays by the construction of Seagate Drive to the south and the construction of Vanderbilt Beach Road to the north 10 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 (see attached Exhibit). The practical effect was to leave Clam Pass as Clam Bay's only connection to the Gulf. The Clam Pass opening has moved over its lifetime up and down the shoreline, influenced by major storm events and by man's alteration of the tidal prism and drainage basin that feeds the Pass. A detailed discussion of the Pass, as well as aerial photographs of the pass over time, is provided in Section 3.0 of this Management Plan. 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. The time lines presented later in this section are intended as background information and as a factual recount based on anecdotal evidence,press reports, published and unpublished reports. Mangrove Die-off and Restoration The first mention of stressed or dying mangroves within the Clam Bay NRPA came from the 1978 Tropical Biolndustries and Gee and Jensen report titled Carbon Flows in Portions of the Clam Pass Estuarine System, Collier County, Florida. Reports of stressed or dying mangroves continued through the 1980's and 90's. In 1995, a large area of dead and dying mangroves was documented encompassing approximately 42 acres adjacent to Upper Clam Bay(Turrell, 1995). By 1999, this area had expanded to approximately 50 acres (Turrell, 2000). The Clam Bay Restoration and Management Plan(CBRMP)was finalized in 1998 to address the mangrove die off. The major objective of the plan was to restore the dead mangrove area through improvements to tidal flushing capabilities of the system, including enhancements to tidal flow into and out of the mangrove forest areas. This was accomplished through the dredging of Clam Pass and portions of the interior channels within the system, as well as construction of a network of hand-dug flushing channels throughout the original die-off area and a few other areas exhibiting stress. In the fifteen years following the implementation of the CBRMP the mangrove forest has undergone a substantial recovery with over 90% of the original die-off area re-vegetated with new mangrove growth. Timeline of Important Events Within the Clam Bay System 1920 A dirt road is built by Forest Walker running from the northeastto south portion of Pelican Bay, a forerunner of US 41. 1950 Clam Bay ecosystem is part of a connected system of barrier islands, mangrove forest, passes and waterways. The orientation of the beaches and passes would have changed seasonally with storms. 11 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 1952 Vanderbilt Beach Road is constructed, eventually severing connection with the Wiggins Pass system to the north. 1958 Construction of Seagate Drive is completed severing flow into and out of the mangrove swamps to the south. This area was subsequently dredged and excavated to become Venetian Bay. 11.,rt7e 0 SM-11..9 -: 4' ,! Vanderbilt Lagoon — y 0: 1, *V 'MT''''' 1i Nit. Y --_ kr- Venetian Bay �"" Outer Clam Bay Aid Upper Clam Bay .4 p fI t •, ti Circa 1952 Aerial Photograph Circa 1960 Aerial Photograph Figure 2:Historic aerials 1972 Tri-County Engineering produces reports: • An Ecological Study of the Clam Pass Complex,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 (PBID) 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 and was mechanically dredged by dragline to re-open the entrance; no records of quantities or dredge limits are available. 12 CLAM BAYNRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 1977 Pelican Bay PUD 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 Biolndustries produce a report: Carbon Flows in portions of the Clam Pass estuarine system. Ecological assessment work by Tropical Biolndustries for permitting of the northwest fill area, notes a small area of stressed and dead mangroves close to Upper Clam Bay. 1979 Environmental Assessment of the northwest fill area is distributed(Turrell, 1979). Tropical Biolndustries 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 Bay 1981 Clam Pass closed and was mechanically dredged by dragline to re-open the entrance; no records of quantities or dredge limits are available. WCI, the developers of Pelican Bay, transferred title to Clam Bay to Collier County with the stipulation that Clam Bay shall remain a conservation/preservation area in perpetuity. 1982 WCI deeded Clam Pass Park and Clam Bay to Collier County and in accordance with the Pelican Bay PUD, required the County to seek approval of WCI or its successors for any modifications to Clam Bay. 1983 Tropical BioIndustries produce biological reports; • Fish populations of tidal ponds west of Clam Bay • Populations of Melampus coffees (Coffee bean snail) and Cerithidea scalariformis (Ladder hornsnail) west of upper Clam Bay. 1986 Collier County constructs a 2,900' boardwalk to provide access to the county park, south of Clam Pass. 13 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 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 Department of Natural Resources (DNR) interdepartmental memo highlights cause of 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 reopened. Clam Pass was mechanically dredged to re-open. Approximately 700 cubic yards of material were removed from the mouth of the inlet and the south bend of the channel. Material was placed south of the Pass. Multiple closures of the inlet occurred during the construction process. 1990 PBID becomes a dependent district of Collier County called the PBSD. 1992 The area of dead mangroves is reported at 7 acres. 1994 20 acres of mangroves reported dead. 1995 Clam Bay is approved by the BCC as Collier County's first NRPA (See NRPA boundary map on page 6 of this report). Clam Pass closes following a winter storm event. Emergency dredging permit issued allowing opening of the Pass,but no work farther back than 600 feet. Mechanical dredging is undertaken removing approximately 5,000 cubic yards of material from the entrance of the pass. 1996 Clam Pass closes following a winter storm event. Permits to open Clam Pass received from the Florida Department of Environmental Protection(FDEP), formerly DNR, and US Army Corps of Engineers (USACE). Mechanical dredging event carried out at the entrance of the Pass. In summer and fall blasting and hand excavation were permitted and completed in 1997. Mangrove die-off area estimated at 50 acres. 14 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 1997 Clam Pass, on the verge of closing following a winter storm event, is mechanically dredged again under modification to 1996 Permits. Interior portions of the flood shoal were dredged to station 6+10. 1998 Clam Pass was on the verge of closing again following a winter storm event. A mechanical maintenance dredging event was carried out under modification to 1996 Permits. Interior portions of the flood shoal were dredged to station 6+10. Ten year permits received from FDEP and USACE for dredging Clam Pass and the interior channels. Included adjustments to the Seagate culverts and installation of hand dug channels throughout the system. Associated monitoring work and storm and freshwater studies were required. 1999 Dredging work associated with CBRMP was implemented(Mgmt by PBSD) in the spring by Ludlum Construction Company. Hydraulic dredging of Cuts 1, 2, 3, and 4(see attached Exhibits)were carried out. A 30 foot entrance cut was dredged. 1 4--,„14,!,(1'� •-^�c 4 '—`arlii ' �� L 'i'r•1 — a I., ' ''' 41140 li 4 r; yv. One way flap valves installed on Seagate culverts to allow flow from south to north. 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. 2000 Hurricane Gordon impacts the area with no inlet closure. 2002 Hydraulic maintenance dredging of Clam Pass flood shoals between stations 3+10 and 18+00 (Mgmt by PBSD) completed to improve tidal circulation(see attached Exhibits). The entrance of the pass was not dredged during this event. 15 IMMENOMMOW CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1,2014 Ver. 5.0 Flap valves on Seagate culverts removed due to insufficient head differential causing them to act as plugs instead of valves. Canoe trail markers permitted and installed through Clam Bay System. 2004 Hurricane Charley passes approximately 30 miles west 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. 2005 Hurricane Wilma comes ashore about 30 miles south of Clam Pass. More limb and leaf loss is noted. Pass did not close. ====_— -"E +v' -..+ ..':tea Hurricane damaged mangroves along bay Same mangroves along bay 2007 2005 Hurricane Wilma damaged mangroves before and after 2007 Hydraulic maintenance dredging of Pass and entrance channel was conducted between Stations 0+00 and 18+00 (see attached Exhibits). The entrance to the Pass was dredged at 80 foot width(Mgmt by Collier County Coastal Zone Management Dept.) This dredging was conducted for sand for beach renourishment. 2008 Tropical Storm Fay comes ashore about 30 miles south of Clam Pass. The area received over 10 inches of rainfall. Pass not affected. 2009 1998 FDEP and USACE permits for maintenance of the Pass expired after 1-year extensions. 2010 Permits issued to continue maintenance of hand-dug flushing channels through the system. 16 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 2011 White mangrove die-off was observed in central portion of the system and found to be caused by a bark beetle infestation of trees that had suffered cold temperature stress. Benthic Habitat Assessment study completed within the Clam Bay NRPA by the Conservancy of Southwest Florida. Study provides comprehensive mapping of benthic habitat compositions and distribution throughout the Clam Bay NRPA. 2012 Canoe trail markers and informational signage installed throughout Clam Bay. The mouth of Clam Pass moves to the north near the Pelican Bay Beach Store. The northern shoreline of the Pass is temporarily reinforced with the installation of concrete barriers. Impacts from tropical storms Debby and Isaac, along with numerous winter storm fronts caused the closure of the Pass. 2013 A single event mechanical dredge is carried out in March under FDEP and USACE permits with an entrance cut of 45 feet. Beach compatible material is placed north and south of the pass above the mean high water line. Development of a new Management Plan is initiated through Stakeholder input and multiple public meetings. Timeline Specific to the Establishment of the Clam Bay NRPA 1976 Collier County Ordinance 76-30 zoned coastal areas environmentally sensitive lands as ST(Sensitive Treatment). 1977 Approval of the Pelican Bay PUD (Ordinance 77-18) by Collier County. The PUD identified 98 acres of coastal mangrove wetlands to be filled in for development while preserving 570 acres of ST lands as the Pelican Bay Conservation Area(35 acres in the south and 5 acres in the north would become parks providing public beach access). 1981-82 Department of the Army Permit(79K-0282) authorized the fill of the 78 acres of coastal wetlands (76 acres for residential development and 2 acres for public parking area). It required 570 acres including Upper, Inner, and Outer Clam Bays, and their adjacent wetlands to be conveyed to Collier County and to remain a conservation/preservation area in perpetuity for the use of the public. It also prohibited dredging Clam Pass except to keep it open to the Gulf of Mexico. 17 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 1988 The Pelican Bay Conservation Area (570 acres) was approved and recorded as FL-64P by Congress and became part of the Federal Coastal Barrier Resources System (CBRS). 1995 The BCC approved the County Natural Resources Department's recommendation to establish the County's first NRPA; stipulating that it would have the same boundaries as the Pelican Bay Conservation Area within the Pelican Bay PUD. The Collier County Manatee Protection Plan is approved. It contains the recommendation to establish an"Idle Speed/No Wake"zone throughout the Clam Bay/Clam Pass System. 1996 Collier County Ordinance 96-16: "The Clam Bay System Water Safety and Vessel Control Ordinance" is approved. It establishes that the Clam Bay System is an"Idle Speed/No Wake" zone. 1998 The CBRMP is developed, implemented, and managed by the PBSD and their consultants. FL Admin. Court Case No. 98-0324GM provided an interpretation that certain elements of the Collier County Growth Management Plan(Conservation and Coastal Management Element)require protection of habitats within NRPAs which support existing and potential uses by wildlife. 2008 Public Law 110-419 was adopted identifying the CBRS, Clam Pass Unit, FL-64P to be entirely located within the existing boundaries of the Clam Bay NRPA. 2013 Work begins on new Clam Bay NRPA Management Plan under the PBSD direction. 18 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 3.0 Resource Description and Assessment Soils Based on the National Resource Conservation Service(NRCS)"Soil Survey of Collier County Area, Florida" (NRCS, 1998)there are 2 different soil types (soil map units)present within the NRPA boundary. It is important to understand that where the soil survey shows mapping units named for soil series, the units represent the dominant undisturbed soils in that landscape that existed predevelopment. The unit descriptions do not recognize or appropriately interpret the drastically disturbed nature of urban landscapes created after the soil survey was completed. `� M. /•�qq.r��) �' rr`` � ° � ����� -h t „i 4 888 .+, r 4t�9' 4 it 3 " ,, 1 99 35 it 4) ® 4 '35 (4114/411W :h 431 j • 100 Figure 3:Soils map of Clam Bay NRPA Durbin and Wulfert mucks,frequently flooded(Map Unit#40), covers approximately 66%of the NRPA. These level,very poorly drained soils are most often found in association with tidal mangrove swamps. Mapped areas can consist entirely of either Durbin or Wulfert or any combination of the two soils. Individual areas are elongated and irregular in shape and range from 50 to 1000 acres. The slope is 0 to 1 percent. The permeability of the Durbin soil is rapid and the available water capacity is high. The permeability of the Wulfert soil is rapid and the available water capacity is moderate. The water table fluctuates with the tide and is within 12 inches of the surface most of the year. The soil is subject to tidal flooding. The natural vegetation within these areas consists of red,white and black mangroves. Canaveral-Beaches Complex(Map Unit#42) covers approximately 9%of the NRPA. This map unit consists of the nearly level,moderately well drained Canaveral soil on low ridges and beaches. Individual areas are elongated and irregular in shape and range from 20 to 300 acres. The slope is 0 to 2 percent. Typically,beaches consist of sand mixed with shell fragments and shells and are subject to frequent wave action. The permeability of the Canaveral soil is rapid to very rapid. The available water capacity is very low. In most years,the seasonal high water table is at a depth of 19 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 between 18 to 40 inches for 1 to 4 months. This soil is subject to tidal flooding under severe weather conditions. Natural vegetation consists of sea oats, seagrape, cabbage palm, and salt grasses. They are commonly invaded by exotics such as Australian pine and Brazilian pepper. Topography Topography is shown below using a Light Detecting and Ranging map (LIDAR) obtained from Collier County. The elevations within the NRPA boundary range from+5.0 to -7.0 NAVD88. The surrounding lands are generally higher than the NRPA and generate the freshwater flows into the preserve (see attached Exhibits). lir MIONNuativiamilim Oq. �._.a � Beachwalk CIR � k t c� s • o derbilt Beach RD i).;?. 1,t'''P: soca o . 71-00/ Rp T `ki Carica Rp ci (2 r , Banyan RD4. I w✓ `a A7, �O o O e 1c o N o a, :x �O 0 O Z X 0SZ 11a •O) ix a Y a 1 ,§ i E U z J\�Q .p. E Eugenia DR . al � ' � �p�m LtJ °o to oO p O c' a1 O O Ge\ -._ . r'ee o O * it J m NA ' ,, �.. 1—; l rn 0 Iv N A 0 01S 03 << SQ {SS ON V r G i 0 m m Legend tco n N Seagate DR Pine Ridge RD LIDAR a NM o 1 { .-.--.Hgh:23 ,, `"� o Pornpei LN l'S \V, CD !iLi Low .7 , Figure 4:LIDAR map of the Clam Bay NRPA 20 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1,2014 Ver. 5.0 Climate Clam Bay's climate falls within the United States Department of Agriculture (USDA) subtropical classification. There are essentially two seasons experienced. The wet season occurs in the summer, and the dry season occurs in the winter. Typical rainfall and temperature data are provided in Tables 1 and 2. In the summer the center of the trade winds shift north and moisture-laden breezes blow from the east or south-east. In winter the trade winds shift southward and the winds are less constant. Weather is then more influenced by fronts advancing from the northwest. This brings cooler conditions, although temperatures rarely reach freezing, due to the fact that they are being moderated by the surrounding waters. Cold fronts are typically preceded by winds from the southwest,which clock to the west then northwest as the front passes, with strong winds of 20-25 knots and cooler air. In general terms,winds are predominantly southeast during the summer and northeast during the winter. Historical meteorology for Clam Bay is based on data collected for 30 years (from 1981 to 2010) from Naples Municipal Airport by the Florida Climate Center(NOAA&FSU). The following charts present meteorological statistics for temperature and precipitation. 1981-2010 Temperature and Precipitation Normals Graph 110.0 100.0 90.0 i� i� �i��� 4• 80.0 .,* �� #� • • —l— -s•,.. • spa ... - • 70.0 s�-""`� • 60.0 *.,�„-- `�•" ,* 50.0 40.0 30.0 20.0 10.0x,•—.- a« --r•0.0 •_.*tet—S�_i • • Jan Mar May Jul Sep Nov O Precip (in) 0 Min Imp (CF) 0 Avg Tmp (`F) 0 Max Tmp (CF) Table 1 21 CLAM BA YNRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1,2014 Ver. 5.0 Temperature The monthly average temperatures range from 64.5°F to 83.2°F. The lowest monthly minimum temperature is 54.2°F while the highest monthly maximum temperature is 91.2°F. The data reflects a humid subtropical climate with a narrow fluctuation in air temperature. Precipitation Average annual rainfall for the Naples Municipal Airport NOAA station is documented at 51.89 inches. The data in the table indicates the highest rainfall occurs during the summer months of June, July, August, and September. 1981-2010 Temperature and Precipitation Normals Graph 0 Precip(in) 0 Min Tmp(°F) 0 Avg Tmp(°F) 0 Max Tmp( F) January 1.85 54.2 64.5 74.7 February 2.10 56.8 66.9 76.9 March 2.38 60.0 70.0 79.9 April 2.36 63.4 73.3 83.2 May 3.16 68.5 78.2 87.8 June 8.82 73.9 81.9 89.9 July 7.27 74.9 83.1 91.2 August 8.58 75.3 83.2 91.0 September 7.69 74.6 82.4 89.9 October 4.19 70.0 78.5 86.9 November 2.04 62.9 721 81.2 December 1.45 57.0 66.8 76.6 Table 2 Winds Winds are predominantly easterly throughout the year,but with a tendency to become northeasterly from October to April and southeasterly from May to September. Winds speeds, not including storm 22 CLAM BA YNRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 events are, on average,below 10 knots. During the winter months when fronts move through, for a day or two at a time,winds out of the northwest to northeast may increase to about 25 knots. Sea breeze As the land surface around Naples and Clam Bay warms,the air above is heated. The warm air is less dense and tends to rise creating a lower air pressure over the land than the water. The cooler air over the water then flows inland creating a sea breeze. In the evening the reverse occurs and the cooler air over the land will flow back toward the water creating a land breeze. The incoming sea breeze acts as a lifting mechanism,resulting in the warmer air rising up to higher altitudes. This creates cumulus clouds that begin to build which leads to the development of afternoon showers and thunderstorms in the area. Storms Naples and Clam Bay specifically are within the Atlantic Tropical Cyclone basin. This basin includes much of the North Atlantic, Caribbean Sea, and the Gulf of Mexico. On average, 6 to 8 tropical storms form within this basin each year. The hurricane season lasts from June 1st to December 1st. The formation of these storms and possible intensification into mature hurricanes takes place over warm tropical and subtropical waters. Eventual dissipation or satnr—Simpson Hurricane Scale modification, averaging 7 to 8 days later,typically occurs over the Category Wind speed Storm surge colder waters of the North Atlantic or when the storms move over mph n land and away from the sustaining marine environment. (km/b) (m) Due to the destructive nature of these storms, landfall can result in 131-155 13-18 significant damage to upland development and facilities from storm Four (210-249) (4.0-5.5) surge,waves, and wind. A good example of this would be 111-130 9-12 Hurricane Wilma which formed in 2005. Three (178-209) (2.7-3.7) 96-110Two 6-8 A tropical storm is defined by maximum sustained winds from 35- (154-177) (1.8-2.4) 64 knots(40-74 mph). A hurricane has maximum sustained winds One 74-95 4-5 that exceed 64 knots (74 mph). Hurricanes are classified into (119-153) (12-1.5) Additional classifications different categories according to the Saffir-Simpson scale. TraniHurricanes can also spawn severe weather such as tornadoes as they stor move inland. Tropical pression l The table below lists the number of tropical storms and hurricanes — that passed through or near Naples over the past 20 seasons including 1992 through 2012 as reported by the National Oceanic and Atmospheric Administration (NOAA)Coastal Services Center and Hurricane City(www.hurricanecity.com). Analysis of the available information indicates that Naples, on average, is brushed or hit by a tropical storm or hurricane once every 2.71 years and is directly hit once every 7.05 years. 23 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Table 3 Number of Named Storms Passing through or near Naples Year #of Storms Names Strength closest to Naples 1992 1 Andrew Hurricane Cat. 3 1993 0 1994 1 Gordon Tropical Stalin 1995 1 Jerry Tropical Storm 1996 0 1997 0 1998 1 Mitch Tropical Storm 1999 1 Harvey Tropical Storm 2000 1 Gordon Tropical Storm 2001 0 2002 0 2003 0 2004 1 Charley Hurricane Cat.3 2005 1 Wilma Hurricane Cat.2 2006 0 2007 0 2008 1 Fay Tropical Storm 2009 0 2010 0 2011 0 2012 0 2013 0 Hai Wilma image 10%19%05 1345Z GOEO-12 WV 1= ! ''� e` A � ` ... IFV ^ �" 4 ) _ �... I Pay.Paseatth41,o h G //aver�u•]�y W 11/�a«raducta htal __ pest(Cal'Iasl Mr' -U -30 -e0 30 AIMMEMININI 24 MAE CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Waves Clam Pass connects the Clam Bay system to the Gulf of Mexico tidal water fluctuations and open coast wave energy. Clam Pass is subjected to relatively low wave energy; significant wave heights in deep water commonly range between 1 to 3 feet(0.3 to 1m). Predominant wave directions are from the northwest to west, especially during the winter months while summer and tropical storm events include wave energy from the south and southwest. The beach material is composed of fine sand having an average median grain size of 0.2 mm. The average net sediment transport along the southwest Florida coast is approximately 30,000 to 60,000 cubic meters per year to the south. The relatively small tidal prism for Clam Bay provides a critical balance between tidal flow in and out of the inlet channel and littoral processes moving alongshore. This affects the inlet hydraulic efficiency over time, especially when littoral transport rates are high due to periods of high wave energy. The wave climate at Clam Pass was obtained from the NOAA Wave Watch III(WWIII)model. Wind and wave data were extracted at the nearest station located approximately 2 miles offshore of the pass. The data included significant wave height,wave period and direction as well as wind direction and speed. A total of 8 years of data were extracted from the beginning of 2006 to the end of 2013. Figure 5 shows the wave/wind roses for the 8 year record. The wave and wind rose graphs show a color coded percentage of occurrence in wave height or wind speed in incremental direction bins of 12.5 degrees. Note that the wave direction notation is to where waves are originating from,while wind direction is where it is heading. The combined annual wave rose shows that largest waves and highest frequency waves typically originate from the northwest to west direction. Since the annual wave rose does not describe seasonal variations,the wave data of 2013 was evaluated monthly and represented by wave roses to assess variations in wave energy direction. Figure 6 shows comparisons of the monthly wave roses for the 2013 data indicating the temporal variation in the incoming waves during the winter and summer months. The annual records are summarized in a time series plot and the wave/wind roses for each year are listed in Appendix 1. rvav[WS( LvryDR05( ^N`t�. r ` • .vmow ,` •.v • 11.11.111.11111 1111111.11.1r—anall FiRwR2.Clam Pass,Wave&Wird Roses-2006ta 3013 Figure 5: Wind and Wave Roses—2006-2013 25 CLAM BA YNRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1,2014 Ver. 5.0 y+rrc KM N oROSC i �yun 1.amr,ss,w++eswu+a Rase.1011 Figure 6: Wind and Wave Roses-2013 Natural Communities In this Section, a natural community refers to the mix of plant and animal species that form the natural basis of the Clam Bay NRPA. A combination of factors including geology, climate,hydrology, soils, and anthropogenic influences determines the specific types of plants found in any given area. These plants are a major factor in what type of animal species that may be present. The Florida Department of Transportation's Land Use, Cover and Forms Classification System(FLUCFCS 1999)has been used to identify the plant communities found within the Clam Bay NRPA. See the attached Exhibits for an overall FLUCFCS map of the Clam Bay system and the existing monitoring plots within these habitats. Table 4: List of FLUCFCS Communities within the Clam Bay NRPA FLUCFCS Community Description Upland or % of Clam Bay Code Wetland NRPA 181 Swimming Beach Upland 5.95 186 Community Recreation Facilities Upland 0.40 322 Coastal Scrub Upland 3.98 428 Cabbage Palm Hammock Upland 0.45 540 Bays (with and without direct Wetland 23.16 connection to Gulf or Ocean) 612 Mangrove Swamp Wetland 64.60 642 Saltwater Marsh Wetland 0.04 651 Tidal Flat Wetland 1.44 911 Seagrasses** Wetland 0.84** **included in the Bays(541) category Several other components of the Clam Bay NRPA ecosystem are also addressed below. These components include offshore hardbottom, oyster, and other benthic faunal communities that are not 26 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1,2014 Ver. 5.0 specifically addressed in the FLUCFCS classification system. Additional historical information on the Clam Bay mangrove and seagrass habitats is included as appendices to the Management Plan. FLUCFCS Code 181-Swimming Beach Beaches form when offshore sand deposits are moved landward by wave action usually during the spring and summer. Sand,which is stirred up as the wave breaks on the shore, drops out of suspension as the water moves up and the beach face. Thus,the beach becomes gradually higher, wider, and steeper. In the wintertime, larger,higher energy waves associated with winter storms overflow the beach area and stir up the sand deposited earlier in the year. The sand is pulled off the beach as the wave recedes and is deposited in an offshore sand bar. If these two forces are in equilibrium, the beach area will be stable from year to year. However, naturally occurring factors such as storm events, littoral drift(lateral movement of sand because waves approach the beach at an angle), and offshore winds,upset this equilibrium and result in the ever shifting nature of the beach environment. Dunes form because of onshore wind action on beach and sand. When wind speeds are sufficient, individual grains of sand start to roll and bounce along the surface. This windborne sand is transported landward until the wind speed drops below that needed to move the sand. Coastal vegetation is critical for slowing wind speeds and causing sand to be deposited. Landward of the highest tides,pioneer or frontal zone sites are stabilized by sand trapping action of various rhizomatous grasses and low growing shrubs that are tolerant of salt spray. Only a few plant species can tolerate the stresses of a dune environment,particularly frontal dune sites. Foredune plants must be able to survive being buried by blowing sand, sand blasting, salt spray, and saltwater flooding, drought, heat, and low nutrient supply. 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. Many plant species that occur on dune areas have developed specific attributes to help them survive these harsh environments. These include high growth rates, dense root systems, low profiles, and high flower and seed production rates. Species common on the beaches of the Clam Bay system include; sea oats(Uniola paniculata), seagrape(Coccoloba uvifera), and railroad vine(Ipomoea pes-caprae). See page 52 for a more complete list of plant species found in this habitat. There is approximately 8,675 linear feet of shoreline within the Clam Bay NRPA in three distinct segments separated by the two Pelican Bay Foundation beach facilities. Contiguous beach habitat extends from the NRPA habitat both north and south along the coast. 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. This particular habitat has been monitored periodically in terms of width as part of the Collier County Beach renourishment program though no conclusive statements can be made about the floral or faunal details of the ecotone over the years. Large scale generalizations based on the annual aerial photographs can be made that the overall size, composition, and health of the habitat have remained 27 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 relatively stable and, with the exception of the areas immediately adjacent to the Pass, are mostly unaffected by the status of the Pass. i7SY *Yf � ::A- S ft; ,})z . b :"C- ty. -.4.1.7.3:8„:;.4. sNj, ! fR} t ,0 j. �,iT� e} t z t '. + 1y. f y.. r ,� 3l,.ca -.=.J. '.. # :cvt'�'.t i���� S� �}f# „„s.,--:44-, f `i ..c� ; � "`.r�' d / Jit v � s tom + � tn ts. ; } -- --,,,,A---/,$, -- c r,''.7,; ; 1 " s ,, t• a \s y 1 = J „✓ _ cgr ep •' Vim{"':',.‘:••ri.4.,:- rA J4 �Z„ �';~l9 't,0 181 --- '* Figure 7:Beach habitat within the NRPA Boundary FLUCFCS Code 322 —Coastal Scrub Landward of the frontal(beach) zone area is the back dune zone(also often called the coastal shrub or scrub zone), a portion of the dune that is more stable,has greater organic matter, and supports less salt tolerant grasses and shrubs as well as some trees. Many of the woody species found in coastal scrub are low growing and shrubby due to low nutrient and droughty conditions of sandy soils. High winds and salt spray often prune the terminal buds of the trees and shrubs growing on the dunes and result in salt-pruned,windswept canopies. Coastal scrub is represented by a conglomeration of coastal species generally found in a narrow band between the Mangrove forest and the beach areas. Species common in the coastal scrub zone of the Clam Bay system include; seagrape(Coccoloba uvifera), cabbage palm(Sabal palmetto),buttonwood (Conocarpus erectus) and Spanish bayonet(Yucca aloifolia). This is an important habitat as it helps anchor the back dune sands and provides habitat for several listed plant and animal species including the gopher tortoise(Gopherus polyphemus). See page 52 for a more complete list of plant species found in this habitat. The primary management issues of concern in the coastal scrub are gopher tortoise habitat management and exotic vegetation control. 28 CLAM BA YNRPA Pelican Bay ServicesPLAN Divisi(DRAFT)no May 1, 2014 MANAGEMENT Ver. 5.0 i r. �f f it" y Y A# Z V: '� Y•^ . •I t #r. � :' ji'l} ,,, I (jm t ry, mow, . _. y r 7th S ` 4 r 'r t ?,i.' `a r �_ �- t+ tie" S '3 i ,, �, 4'.' ' e^ �• Fie et -f�1-,,,i. 'y, �'t-, �i �'= .,',Et,?••,..'„—``''6 1 gg 7:-`-;:=-, , �t1{1'�' 4t tx c� ,,. r 1 V r `ar t t -r* t v (d ,,'t � r t �'. �r .� FTtl� �4 � 4\� �� � q,ib. �1 ��/ �� �{ `�a. - 1 'i� F p • r ,rt, y.- -t ,"'Y • . ii' 01 r,nrt ie.:.I 1-41. ' '-' — r r/,„.t !O.,/, 'i';',4.!Ai, ''.' . ,A,-4j--; ,A= S r .i V 4'r ;`{ {-:.1,,::,,,,?7,-','N, } gyp. t{ -r. Vit.>t �� } t c'tl7"' 411- '' s i" iiN F� e e i_ f 14 . b fltr ` 1�,- - %'`, A .`' ( h—1,r,y:f ` V. =a t''s ��'�' ti7�.• '•:4/...:1,.. fro . r ,.. ,14.5-..i.v4,tEpy-4.,,:n.--...-- --- -7--1 -;'' ' 4 C `' 1' ,fir + r �� ,-., : - --c,.,,,.,..,,,.*v:A -,,,i.J-,sc.,,,, - , :yt -,'''' ,I"I , :11 '‘-'1' • f it p I+. , '\) N'i. \A'I I,lo 1.1 VI''':r 7.•t- Z-C‘ : ir : !..1 ‘. . '' "'.5 'v- ' 4 ' '--1-1.-.>.‘k C ' . \\;,1 , •`'r,,--7-----,'-.. -,-' ' �r 4 s{ ! .. ° �F` t err '., ',1n . 4 '�.It i ;4•14!•,:'•=--,,I, ',.;:..1 ,1;-(-',-,.../.":+,- .N�,,, `. 5 �/ SY" } tt �i-,', ' t'3-*.A Y't7',Y�C�' }�73�+kst: .,. Y "f. `t ;r ` �I �, ' Vts. :. ~,'e:., Wpd',70::: 1t �! I'tIps,i,— .�•� va»�s� i -... y.`1.? 7 , ,w fel * �� , `% f •e4I"„,,_2__.p, ` y . -•"IOVc. .. V' t7.it r,r•. ,. . �{ i. Mme'`, $..tt w t t''r ' f, i ,$ ;it' , • srj: C. t ~- r`, "=1 w,t 'I �,•4.1.1. ; •' ` g_.�_ .-r 7'.+ i. e` ,1'( ,"* .4,x7 %1_.44•::).-,..)›r•---gr-,:- `'". '. *e�ca' fr •iiki =1”, c. , 4 ' � , js tl�,- r z *1 T j t t � t ,oh t t � , k r x rd r. ' � ',T�` 17° �� y _S'±a +e-., -e �,.. n. -=r Stn A " 'u+ _^+ ,+styi�l.�' `•sn _ A • t't.. a 1 -� . 1,--1*;,,- t=A'y 4 z } 'd--r4 `�. .,r 4....,,,-,,,,„ .,„,...,,,:._„:„..-...-t47,„,`7 , �' `. s,t } ,,'414?-4'.:1:1°,,;'. t C:+ ,� 1 3 y '1 .„t, + A h 322 _` Figure 8: Coastal Scrub habitat within the NRPA Boundary FLUCFCS Code 428—Cabbage Palm Hammock This forested zone is composed of the more protected dune vegetation farthest from the Gulf of Mexico. The Cabbage Palm Hammock habitat is identified by the preponderance of cabbage palms (Sabal palmetto). It is generally found in pockets located between the mangrove forest and the coastal scrub zone or beach areas. Aside from the cabbage palms, seagrapes(Coccoloba uvifera),buttonwood (Conocarpus erectus), and several other hammock species such as wax myrtle (Myrica cerifera) and myrsine (Myrsine gztianensis) are common. See page 52 for a more complete list of common plant species found in this habitat. A hammock is a habitat that is densely shaded by a canopy of trees. 29 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Hammocks usually have sparse groundcover that leaves the forest floor mostly open for animals to travel through. Hammocks also provide a reprieve from the sun for animals and humans alike. In Clam Bay,this habitat is also susceptible to infestation by exotic vegetation such as Australian pine (Casurina equisetifolia) and Brazilian pepper(Schinus terebinthifolius)which are addressed further on in this Section. The primary management issues for this habitat are exotic control and preventing destructive visitor access. pgi(:-Itt.-773Y5:, � Ft T Y.1 �,,s�_ pe L ��Ye t1 '' • "�, ) r; .,.I �''t . '?'w, yr, t 6 W i ..} r ri► i r � ", y ,,, �1 1' 4 1 #•- , � , x� -- erg 'i !. L itcp ,� �;Zk%At i1 -4�S •:r.A11, i° I"..-4, -1 4 U ,,-- .r..-- �jYl'T }ts - --- ._ ... 428 428 Figure 9:Cabbage Palm Hammock habitat within the NRPA Boundary FLUCFCS Code 540—Bay(with and without connection to the Gulf) The Clam Bay NRPA contains the three larger bays associated with Clam Pass(Outer, Inner, and Upper) as well as the interconnecting shallow creeks and small open water areas. Second in extent of aerial coverage within the NRPA boundary, it is the bays and interconnections which serve as the life blood of the estuary. This open water habitat serves as the basis for many other communities. Seagrass beds, oyster bars, clam beds, and other benthic communities can all be supported to varying degrees with the open waters of the bays and interconnecting creeks. As outlined below, several of these communities are present within the Clam Bay NRPA and will be considered when deciding on management activities outlined within this Management Plan. Multiple studies have indicated that 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; Lewis 1997; Wilson Miller, et al 1996;Turrell 1995). The dredging conducted within the Pass and the interconnecting creeks, as well as the hand-dug flushing cuts,have been seen as the major contributing factors to the restoration of the mangrove forest community within the system(Turrell 2008; Humiston&Moore 2003). 30 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Tidal Pass Clam Pass is the only open water connection to the Gulf of Mexico for the Clam Bay NRPA. The exchange of seawater between Clam Bay and the Gulf is critical to the ability of the estuary to export organic matter, as well as to help regulate excess salt and freshwater. It also supplies oxygen rich water from the Gulf. In the absence of surface water circulation or tidal activity, estuarine habitats such as mangroves can 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 RANGES e Posuretioemoux N ioxaoi.2000 RANGE O 03,004+'04RANGE e 06.0007700RANG€ 009,+011.1000 RANGE ■12.0001 01 RANGE O 07,01-05'01 RANGE —_--- _.---- 007.151.0•01 RANGE ii0101-1170IRANGE a01,+0209'02RANGE e 04.%07.'02RANGE e 07,02O'0`RMJGE ■1 I 10z0Z'CORAl1GE e05,13306'03RANGE x07,03.1170.IRANGE FCC:040107RAME N - x09,06-C6(ORANGE •08064X1'0 IRANGE ■120004.07RANGE 008O'40'0'RN40E lit 1 g - 010081170BRANGE 1 i i # I 'Y� € Y i t' 8 t5 la A- --e-., 9 E A R. v a R • -, a § F e$ 7 y p i 2i 2 z ? I ' � :1! S31 i S3 s £ 1 ; S LF REGISTRY SOUTH NORTH UPPER 31 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 It can be seen that the health of the mangrove forests is directly related to the efficiency of the tidal pass. Clam Pass and its associated waterway is a very dynamic creek whose location has varied over time(Turrell 1995; Tackney 1996). Because of this, it is susceptible to outside events and can periodically close, such as has happened at least six times in the last 25 years. The following aerial photographs show how the Pass and its waterway have changed over the past 60 years. '.3 - k L a , t ,,, x If ,frt s. ', ' Jill-**4 ,, t h.iVia. • ' . a , Pt " i : . '' , , E .. . ••• 11" Ita. N � + rt.' t, $00,-1 ;k CLAM .. ; CLAM PASS , PASS 1. 973 v 1 1985 #. CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 - T f . CLAM °1 }„, tx: ; CLAM i PASS PASS .4 , ' L 4 ``t 2004 i, tieIf r * r• a .r-aL i'yit' yt. �3�3Fi. .y y H ddd r 10 1 CLAM AL. LAM i ' PASS '` i SS l9 i 15 4 , Figure 10:Historic aerials of the location of Clam Pass Tidal creeks are passageways for fish and marine invertebrates between the open waters of the Gulf and the protected embayments of Clam Bay. Manatees, dolphins, and turtles may also use the Pass. 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. Management concerns related to the bays and associated creeks include maintaining sufficient flow through them to accomplish flushing needs of the system, stabilization of the Pass without harming other components of the NRPA, and educating recreational users of the NRPA of the need to protect the shallow water habitats and the communities located therein. 33 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 t� � ir `�'S pis z.c;: � ( 4t r+ pT s �� 2fi i c. y�,y�} �• y nom � .� ( ;ins i ` ' > t : 4 �����1'�_ 1 , '�C�rs i� �.-r j+ ' r t �� H.\'J` ti„ �sl ��a �a�'♦ +'�;..t'A" f iv 6144,41 540 540 Figure 11: Open Water habitat within NRPA Boundary FLUCFCS Code 612—Mangrove Swamps (Forest) 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,terrestrial, and avian wildlife. • Protecting coastal areas from storm surges and coastal erosion. • Improving water quality by acting as a natural filter for land based freshwater run-off. • Forming the basis of a highly productive estuarine food chain which includes many commercially valuable species. • Enhancing the atmosphere by absorbing carbon dioxide and reducing greenhouse gasses. Approximately 65% of the Clam Bay NRPA is composed of the three most common mangrove species in Florida, namely red mangroves(Rhizophora mangle),black mangroves (Avicennia germinans), and white mangroves(Laguncularia racemosa)make up the mangrove forests within the Clam Bay NRPA. For a more complete list of common plant species found in this habitat see page 52. All three species have special biological adaptations to cope with salt and unstable,mucky, low oxygen soils that result from the tidal, hence continually waterlogged, environment. The dominance of mangroves in tidal areas is a function of these adaptations and their ability to out compete other wetland plants. Tidal flushing allows nutrients to be distributed within the forest and provides for the transportation of dead leaves, twigs, etc. As this material decays, it becomes food for marine life. It is this mangrove detritus which is consumed by the many organisms at the base of the food chain which in turn create the next level of the food chain necessary to support the fish populations that characterize the mangrove community. Special attention has been given to the mangrove community in the past because of the die off which occurred between 1991 and 1997 (though stress in the community was documented as far back as the late 1970's). The die-off affected black and red mangroves initially but eventually ended up encompassing some white mangroves as well. More details on the recent history of the mangrove management are provided in Appendix 2 included with this plan. 34 CLAMBAYNRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Red Mangroves Red mangroves (Rhizophora mangle) are recognized by their tangle of reddish looking prop roots, long cigar shaped seedlings (propagules) and their large,pointed evergreen leaves. Red mangroves flower all year but reach maximum propagule production during the late spring and early summer months. They are typically the most seaward of the three species with the prop roots and vertical drop roots providing support. Small pores on the trunks called lenticels allow oxygen exchange via air as the waterlogged soils become rapidly oxygen depleted. Salt is excluded from the plants cells through a process called ultra-filtration roots. The characteristic propagules germinate on the parent tree and drop and float for up to a year, finally becoming heavier at one end so that when encountering a suitable substrate they are ready to root upright. The mass of 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. '4.,oNiitt-t .4:• # t � •� :f i�t t '� • 3 1� ,�P' 7 41, om • - - •,... •,- it.e. , �l'? ` i � •'' ` ` ! ' lt: ta . W ' r ' *• * ' 1r 7Y t ti ►$ X' 4�, ti '1%..1.*:** i f Pn'( 1`,: '�s. • r�t ,� oe . .'.:4 t 'lf a i"'1 �`' °S_ 5 ;.1"!*1 ,ii 11 •i/+`., :'', g +l`1� f 41 s Red Mangroves and Propagules (inset) 35 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Black Mangroves Black mangroves(Avicennia germinans) are typically found a little further inland. Key identification features include the snorkel like pneumatophores 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 keeps salt out of the body cells through filtration in the roots; the black mangrove excretes salt out of 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 lima bean shaped propagules are typically apparent during the late spring and early summer months. Black mangroves are cryptoviviparous as the embryo develops within the fruit while on the parent plant. When these propagules fall from the parent tree,they are able to float for a short period before rooting in the mucky soil. r 9 IA tIAil . 1 ;'at r r/) ' t` tlr t".tI. t' e� ...'til ;r ,- 4- / .4 -. , - ,,,-, '1„ �„t, , ! 4, ,,k .,t.� off'` { r�� "I R r i f ._t.• firL.* a , 441.iti i,--t,, I $ r % ; Ilk, H „: ,:'•jliii:r: li r i f'•' ••• *.`.', t k 1 h. i I, 41.1.4 * -:-4' 14, 114 A . Y>s.:1. ' ` / t !-� P . l •d,y .., . -,,e F .. rtt {, ,.c. 3ti' .y:. `'. r ,,e L.1.jry(�}r'T1s pxP `' 7.' ='i .;,...e „...... • _, .. , tr,tr... -.'sj,',V --A,4,7,.;.)AS.t..'''.,: N' - c,',.'; • •4 . : k-s.,414: ;-:., ,,t,-.4,,,, a Sk• . l_ti ..‹.,, i,Si4:tt4 z.- .., �z } .t° 5 } '1 1‘ ,..-i.,, i 1.1. f moi'iiii -t y 1 '�.- i.. trI ; S 1 ( � ^ti•S` yyyttt� ft i : c w.. j t 1 '` ! Lel lZ' 1r' lb:, i',7�.i r'Y•J `.n d ./4 .ems:,ier r} -,;,.,..1.- M •!}t d q�f gt fk! / ,0;14.t. � �L :-.41 r 1� g.�� r �— A_ • --.' t kit ‘:1F, -m �� .ay H �_��/ I 4-,.7 .- 1, 4„,,,. 4c.z.v„„,... ,1::::,:,..: j..R. 1.. h„ bT 1 ... "+F" 4? t .'/-4., ,. i e% .,1.,.. i.t 3. ?-, ”`'41, 7 114. J ca. ." j .^? ,4. N,+`-`:C'r ;:;:r -per _ ` ' -. . ' u ` ..V \',. .9�`. ' , L M , �'+..Y.� ,, . ,,.,,- ,,,,,. ...,..vi‘,...,lki t �� tt`.tt' iJ a It t`r'i ,, ''� 7TH )p. , ! 1x1, • Black Mangrove Pneumatophores 36 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1,2014 Ver. 5.0 White Mangroves White mangroves(Laguncularia racemosa) are the third mangrove species and are often found further inland than the other two species (although zonations described are typical they can frequently vary). Since they often occur in drier areas,white mangroves 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. White mangroves also flower in the spring and early summer and the small seedlings have the shortest floating dispersal stage of the three species. White mangroves are semi-viviparous and germinate inside the fruit during the approximately five day dispersal,but not while attached to the parent plant. --- 414:,..' - , W a''' . .,, . _____„ , \ ..,, , 0 . . ii„,..,% , , h,., -,... _ 0 ,,,, ... , ,. It . 4 , ; . I � ry,ri j Ed i i, p m uric . ,I :,,,, ' -* ,' ,: *4* . to , II 444.4 \----7 ,. m''''' 3/4 f p,,. c „, 4t.i) White Mangrove leaves and fruit 37 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1,2014 Ver. 5.0 The mangrove communities are composed of both riverine(along the creeks) and basin forest components. The species composition of mangroves within these two community components is very distinctive. Riverine mangrove areas are almost exclusively composed of red mangroves within the Clam Bay NRPA while all three species, along with buttonwood(Conocarpus erectus) are found in the forest component. Riverine (Creeks)Mangroves On the waterward edges of small islands and the tidal creeks,passes and estuarine waterways that make up the Clam Bay system, a fringe of red mangroves will be found growing up to 25 feet in height. This zone can be just one or two trees in depth or extend landward for some distance, depending on topography. The habitat provided by the prop roots of these red mangroves is of great importance to many fish and other aquatic organisms. Forests The majority of the Clam Bay mangrove habitat is low-lying basin forest where the dominant mangrove species varies between red,white, and black through the forest habitat. This forest community was the habitat affected by the mangrove die-off. The hand dug flushing channels were constructed throughout this community to increase the flushing capacity through tidal inundation. Associated plants within the mangrove habitat include buttonwood(Conocarpus erectus), the succulent ground covers; saltwort(Batis maritima) and 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). f� ,a— � aria, s,, ,nc� �+!'tf 7.47q;.., a,�" "-a. rrk-, witr..v 1t'� 1,,,� fah.,,. ....-4`� '. y +1�F 4 `r 't c�' t 419 �,, 1 Stu, �`7 "3 e •,•�" t a 77.•- NS zA ( yam(��'J�.1 �l t y; 4,24;04.,.: ..,--,_.. �' ! ,f� ,� I.145;' Y'� A a � _Tr vY s#. � ,- v .1 . r1 ' :i . �'° 3'4's'.e3x .3r 3tE- ..�s^3 "?'T.` .,R. ' ,.:.••,>...=-2. m,s. �F__ 612 _ _ .. . .. ++.46 Figure 12:Mangrove habitat within the NRPA Boundary FLUCFCS Code 642—Salt Marsh At the interface between forested mangrove areas and the water management berm are depressional areas that have become colonized by aquatic freshwater plants such as cattails (Typha latifolia), Carolina willow (Salix caroliniana),bulrush(Scirpus californicus), needlerush(Juncus romerianus), and leather fern(Acrostichum danaeifolium). For a more complete list of common plant species found in this habitat see page 52. Wildlife such as otters(Lutra canadiensis), alligators (Alligator 38 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1,2014 Ver. 5.0 mississippiensis),various turtles, and wading birds can be commonly observed. These areas require regular maintenance to prevent the spread of nuisance and exotic plant species and ensure optimal functioning and interface between the natural mangrove forest and the development water management system. + SY ; • `d .Lt •� id24'1�YI` � $ ',,777" }J},• � „ri l+ 1 ti 1, a . 'l� t viv � ` } ii1 r j 642 Figure 13:Salt Marsh habitat within the NRPA Boundary FLUCFCS Code 651 —Tidal Flats Tidal flats are flat bottomed, sub- or intertidal habitats that lack an oyster or seagrass community and are located inside the outer coastal margin. The two most significant environmental characteristics that control a flat's infauna(benthic organisms that live within the substrate) and epifauna(benthic organisms that live on the surface of the substrate)are: the height of the substrate relative to mean sea level and the sedimentary consistency of the substrate. The position relative to mean sea level dictates whether the habitat is emergent(in air)for part of a tidal cycle or how deep below the water it is. This latter characteristic controls other physical water quality measures, such as dissolved oxygen, the frequency and duration of hypoxic events, and light penetration. Firmness of the substrate affects the capacity to support an epifauna by both supporting the organism on the substrate and permitting the burrowing of the infauna. The sand and mudflats of Clam Bay are rich feeding grounds for many species of fish and 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. The dredging of the pass associated with the 1998 Restoration and Management Plan resulted in an increase of exposed tidal flats within the southern portion of the system. Increased tidal range resulting from the dredging allowed more area to be periodically exposed during the tidal cycle. Some of the area that had supported seagrasses prior to the dredging work were converted into the tidal flats by the increased range and reduced phase lag. Management concerns related to the tidal flats include the templates established for the dredging,the resultant currents that could be expected as a result of dredging, and the frequency of disturbance. 39 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) ,..4;=,,tN.,1..,:ce Bay Services MaDivii on 1,204 Ver. 50 a.0i.401;4:-,,,,,t,!...,)--A. � a 1 � ii {I R17v`:a �iyf � �4 Y1lt` r ii . , t ..--:;.!-=,$..::;. lr ° t }:; ttT o ' + ,--,=- 71-z—,,,--,/,‘,...... 4 t i s V' + . ',1: ` i � ,'.L c1k`� t„,- `id} v'' �,-t S 1, . 1, t. iE cjZty :9 d r A: -, s r Lid• , Si ',I V'' y",f12. ',A ,11:' `' } `' '.1?-4 Nr 4, ' ''*Q't T1,...1'.4:',, '''.:'''. . 651 Figure 14: Tidal Flat habitat within the NRPA Boundary FLUCFCS Code 911—Seagrass Beds Seagrasses are flowering marine plants of shallow, tropical regions. With a creeping growth form connected by horizontal rhizomes they serve to trap and anchor sediment. Both the grass blades themselves and the surface area they represent provide food and attachment for marine species. Seagrass beds are renowned for their value as nursery habitats and are legally protected. Several areas within the Clam Bay system host seagrass beds, specifically Outer Clam Bay and waterways just inside Clam Pass (see attached Exhibts). Three species are commonly found in these Clam Bay waters;the largest turtle grass(Thalassia testudinum)with flat strap shaped leaves, the smaller shoal grass(Halodule beaudettei(fka wrightii))with narrow, flat blades and paddle grass (Halophila decepiens)with the smallest,paddle shaped leaves. Shoal grass is by far the most common though a small area of turtle grass has persisted since the original 1998 dredging. 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. f L ,'.1. ( t cI' *p..f L J'XA yr,.. • rt .� .6:,..,• f±,7-54.._,..„. , r1 ., em.t,f```%:=::,0,f'� (' �'l ii*,F ? ;, ., `' + '. a;� FT:� R , ., 1 ��I',' +,a.. rea' 'tis = 3�r: ,.tit I a". ''�' }•.':71.1.-",:',.1, i{j�'��' i�'k e+``r x�, � ; + r tfr ;>;.k 1.a .*_ - �G `� ) rr =r ,l" t } }, .sal , �` ,t .., �.. .�� t` ; �F"� ,, ,_.le �� 4 qtr�7'''''s,;..-.,,,,f.::,..,i.,;‘,_._: � f t k.{s c t �r 0 p t v� + �.. ;_. y:trixi-,t. 1 1' jgt lf.4-1. '' -,.,- , , ' rt'p t G v., y , e: 4.f 4- GRASS ��� Figure 15:Seagrass habitat within the NRPA Boundary 40 CLAMBAYNRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 f � 4 , -,!.'/ , .,- t. _;,,.... -..7.-;:..,--"I""Yr. +P i s 'f' . „te 1 _ r "Li •'. *.t.°' , r.,, y� .-'a c 1 r' _ T ..7,,..-- S'" ;•••;.,-...,,,. .* e,7. .' i �'---1.-.---,,,,-,7-,/ ,.7',--4.7;i.--.--7.„.„ '� -h.�', "�'�.'�'� � `'�`�' ..r'r�'-fir- ,,�,- � -,--,S4-114%--- �����.,,,,,i„,,,, *•S':-.1.-"t•T!':; ;',.'Iti-.;:=1.7:7=. "-, ;:--7.=! ''. .':::':: :77-f-,:--''....1.::''-..-•!7::",,,.::::i:'... 4='.. '';''=';'-' '*:::::'ti-,;:* 't` c i � ..SIF -,:-.--• '"" 4,f,..„•,-,4,'.0-, :< l t`i. ""' s r ' "' '' '` ;: � ,`�"' ` • sir � ��: r -?e�-y' �.,r .�1P .,.'i-011 R ,:T t Shoal grass (Halodule beaudettei) along interior channel south of Clam Pass . r: `77, -Af , .,�'t � ��` k t, ,.x;91^„ -,....-%*,,,,,,,, �,#y`� 6" r ,.„. „... . , , ... .,...,7,..:,..._. „,„ , .„.„,..„,_,_ . _ ,t,,,,,,,..„. ..... :„.___„..,,o,„. ,.. „ . ,::„._„:„.;;,*:::44,:,:--,.:' .us R , , ,....__ - ...,... , .;,. . , , - - ' a �a, ortilii%.*,.4:-'7Z,,,t,::,-ii.Wiik.:, ,'". . . ` .,. ...,, . , .. „.. .. ,„ 41 CLAM BAYNRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Paddle grass (Halophila decepiens)in the center of Outer Clam Bay 411111/1/.11111 'fix :±a t0„% ..' C�"^�*4 �, � � 6"=`ter rt Turtle grass(Thalassia testundinum)just south of County boardwalk in Outer Clam Bay 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. Seagrass coverage in Clam Bay has varied over time but has always been found predominately in Outer Clam Bay and the waterway between this bay and Clam Pass. A 1994 Collier County report estimated seagrass coverage at approximately 10 acres. Pre-dredge surveys conducted in 1999 estimated coverage at about 5.13 acres. Annual monitoring of seagrass beds along the monitoring transects has estimated coverage from a low of approximately 1.2 acres in 2003 to the current estimate of 2.85 acres from the 2013 survey. It should be noted that the coverage estimates are taken from along the survey transects only and do not account for other scattered grasses that may be located elsewhere in the system. Management concerns related to seagrasses include direct impacts due to recreational use and potential dredging templates, turbidity and water quality concerns related to flushing (too much or too little) and stormwater inputs, and algal infestations due to nutrient increases. A history of the seagrass monitoring efforts in Clam Bay is included in the Appendix 3 attached to this report. _ 42 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1,2014 Ver. 5.0 Other Benthic Habitats Oyster Bars Oysters(Croassostrea americana) are filter-feeding bivalves, which were once common within the tidal creeks of Clam Bay(Humm and Rehm 1972). Oysters play a significant role in shaping the environment in which they live by forming a hard structure upon which an intricate biological community is built. Similar to coral reefs,oyster reefs are `biogenic' (formed by the accumulation of colonial animals) and provide structure and surface area for numerous other temporary and permanent species. Providing complex habitat structure is the most fundamental of ecosystem services that oysters provide. The structure provides a place for algae and non-mobile invertebrates to attach, as well as a place for mobile invertebrates and fishes to be protected from predators. Although the relationships between sportfish and oyster habitats are not as well studied as in other estuarine habitats such as seagrass beds, they are considered essential fish habitat. The numerous ecosystem services provided by oysters can be summarized into three general categories: habitat provision,water quality improvement, and shoreline stabilization. Oyster reefs provide habitat to a diverse array of flora and fauna. The role of oyster habitat to the estuarine food chain is highly significant, as discussed in the previous paragraph. Through their feeding process oysters filter large quantities of water which transfers energy and material from the water column to the benthic community, subsequently reducing turbidity and water column nutrients. Through bio- deposition,nutrients are made available to the flora and fauna which comprise the complex oyster bar food web. Additionally, oyster reefs stabilize sediments, shorelines and adjacent habitats by buffering wave energy, further aiding water quality. Deteriorating conditions related to closures 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 past years monitoring efforts. 43 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1,2014 Ver. 5.0 Oysters(Croassostrea americana) along the mangroves near the canoe ramp in Outer Clam Bay A 2011 benthic habitat assessment conducted by the Conservancy of Southwest Florida found living oyster clusters in the upper reaches of Upper Clam Bay(a single cluster), in the tributary between Outer and Inner Clam Bays (a single cluster), and throughout the shoreline of Outer Clam Bay. Management concerns related to oyster growth are similar to the seagrass concerns, namely protection from recreation users, water quality, and flushing. •N43'a' Y.f ..t-' s� •.71.1. S4 .: 7 s wa • ,..iii. ' .?Iry •'$.7-- 0 1 ..1 .,..w' ,v-...:,„,(..,016.,4,..,,,.., .1. .,., ____.,1,... .. .. 7....,,,_ :,,, -.,_,_, , • —..„ .i.•z '1,...., t,..,,,,,, _ ,,,, , '' $ 41' .ts.- `z 11 S >} 1 cd.--i, 'gyp 40-,-14,,, wy�. ,, ' 'VA 4 73:-.,:,;,`,4.1*--‘?-~. d+ ._ g 2. r: �ry.y S Y I@. 4 +.�,;� • t4 , .R APPROXIMATE OYSTER LOCATI, r Figure 16:Oyster locations within the NRPA boundary 44 CLAM BA YNRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Other bivalve mollusks In addition to oysters,the 2011 benthic habitat assessment conducted by the Conservancy of Southwest Florida also found two other bivalves within the Clam Bay system. The pointed venus clam (Anomalocardia auberiana) and the stout razor clam(Tagelus plebeius) were both observed. Turrell, Hall &Associates, Inc.benthic surveys found several beds of southern hard clams(Mercenaria campechiensis) also present in the system. t.e. . Jit tf Southern hard clam(Mercenaria campechiensis) from waterway south of Clam Pass These mollusks are generally found within the shoal and tidal flat areas of the system and could be susceptible to impact during dredging or other disturbance operations. Management concerns would beprotection from recreational users,water quality, flushing and dredging. . A 1 'j ,'al-}'" 4,.°-act 4 s -7^,' c"s ;-N.,go--sA,11._ d • , . v.,1' .' > in • lok � rTa�1 xa be,a„` Rt 0 ' 1s .4 k imp- '� �•'` "� .,-1,, -�.t, y;"e,-'-, ,,,, K"---, _ ""`�(K �,s}�i.A; Fart wx 2 a ea. c q --. o e e Figure 17:Exhibit from Conservancy of Southwest Florida Report 45 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Tubiculous Polychaetes Tubiculous polychaetes(tube worms)are typically the most abundant biological assemblage in Clam Bay and are primarily associated with muddy and sandy substrates. Polychaetes, including worm tubes and mud tubes, shell-encrusted polychaete tubes (Polychaeta) and trumpet worm(Pectinaria gouldi) tubes are a vital component of the estuarine food web,providing key linkages between primary producers and higher trophic levels. Polychaetes create habitat and food for many organisms such as mollusks, fish and even sea turtles. These worms are usually filter or deposit feeders that keep the substrate aerated and free of waste accumulation. Polychaetes tend to dominate Inner and Outer Clam Bays,with lower occurrences in Upper Clam Bay, the Lower Tributary, and,to a lesser extent, the Upper Tributary. Hardbottom Communities Another important marine habitat marginally 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. Hardbottom outcrop off of Clam Pass Collier County has mapped this resource through side scan sonar surveys in 2005 and 2009 as part of its beach renourishment project. The information received from the County shows that the landward edge of this habitat is located approximately 250 to 300 feet offshore from the Pass. 46 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 7 w 74" y .',n..oc y� .)-i--,,,,,,:t:,I ,- -3 s s,,,,�4k , 'e.11 st r. ,,30 IL 7:",aft' :g9tt,iA ,..-,11:1FittliWt,t. ce.,,r,,,, %.A1 qui*: � ..4, -•V., < r �` OUTER ` t�rovor- �r CLAM BAY r ,A,. INNER f, I CLAM BAY .. l o'5"', 1i� UPPER - J, -.1 ,fyl CLAM BAY kr.,1.A r-' ',` -i v . ' -' � ' x 'CLAM GPASS n.. „. GULF ' f , OF MEXICO Figure 18:Hardbottom Community off-shore of the NRPA boundary Management concerns related to this habitat include recreation use and potential turbidity impacts resulting from dredging or other management activities within Clam Bay NRPA. Invasive,Non-native and Problem Species In an ecological context, an invasive species is one that is aggressive in growth and expansion of range and tends to dominate other appropriate native species. Its establishment and dominance can cause widespread harm to an ecological system by altering the species composition, susceptibility to fire and hydrology of an area. Non-indigenous species (i.e.,non-native or exotic species) are those that have been introduced purposefully or accidentally to an area outside their normal range. The characteristics of some of these species (high rate of growth/reproduction,no natural predators, easily dispersed, able to out-compete native species)make them invasive. Some indigenous species(a species whose natural range included Florida at the time of European contact circa 1500 AD or a species that has naturally expanded or changed its range to include Florida)may also become invasive. Invasions by native and non-native species often follow an alteration to ecosystem function, disruption of the food web, large- scale fragmentation of an ecosystem and/or disturbance(e.g., clearing, fire, drought, etc.) of an area. While some native species may become invasive, the establishment and dominance of non-native species is of particular concern. The exotic species documented within the NRPA and those that have a potential to occur within the NRPA are discussed in the following section. Invasive and Problem Plant Species The Florida Exotic Pest Plan Council(FLEPPC)maintains a list of exotic plans that have been documented to (1)have adverse effects on Florida's biodiversity and plant communities, (2)cause habitat loss due to infestations, and(3)impact endangered species via habitat loss and alteration. To date, 9 non-indigenous plant species have been detected within the Clam Bay NRPA which are listed by FLEPPC as Category I exotics. FLEPPC defines Category I plants as those that alter native plant communities by displacing native species, change community structures or ecological functions, or hybridize with natives. Category II plants have increase in abundance or frequency but have not yet 47 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 altered Florida plant communities to the extent shown by Category I species. These definitions do not rely on the economic severity or geographic range of the problem, but rather on the documented ecological damage caused by these plants (FLEPPC 2013). FLEPPC Category I plants observed within the Clam Bay NRPA boundary: - Brazilian Pepper(Schinus terebinthifolius) - Melaleuca (Melaleuca quinquenervia) - Australian Pine (Casuarina equisetifolia) - Beach Naupaka (Scaevola taccada) - Earleaf Acacia(Acacia auriculiformis) - Shoebutton Ardisia (Ardisia elliptica) - Air Potato (Dioscorea bulbifera) - Lantana(Lantana camara) - Old World Climbing Fern(Lygodium microphyllum) FLEPPC Category II plants observed within the Clam Bay NRPA boundary: - Coconut Palm(Cocos nucifera) - Wedelia(Sphagneticola trilobata) - Oyster Plant(Tradescantia spathacea) - Mahoe (Talipariti tiliaceum) Methodology outlining the management activities that will be used to treat exotics is found in Chapter 5 of this Management Plan. Listed Species Smalltooth Sawfish (Pristis pectinata) A juvenile smalltooth sawfish was observed in 2008 in the connector creek between Inner and Outer Clam Bays. Smalltooth sawfish are found in the tropical and subtropical Atlantic Ocean. In the western Atlantic they have historically ranged from New York to Brazil, including the Gulf of Mexico and Caribbean Sea. Habitat destruction and overfishing have succeeded in eradicating the smalltooth sawfish from the majority of its former range. Consequently, it survives in small pockets throughout its current range. The last remaining population in U.S. waters is off south Florida, a small remnant of a population that once ranged from New York to Texas. This sawfish primarily occurs in estuarine and coastal habitats such as bays, lagoons, and rivers. It does at times occur in deeper waters, however, and may make crossings to offshore islands. It can tolerate freshwater. This fish is easily recognized by its flattened body and wing-like pectoral fins. The mouth is located ventrally, the eyes are positioned dorsally. The"saw"is approximately 25% of the body's total length. It is widest at the base, with teeth more broad than long, and spaced apart. The tips of the teeth are sharp, becoming blunt over time. Dorsally, it is brownish or bluish gray body with a white underside. The maximum length recorded is 24.7 feet(7.6 m); however, a length of 18 feet (5.5 m)is considered average. The average lifespan for the smalltooth sawfish is unknown. 48 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 On April 1, 2003 the U.S. National Marine Fisheries Service placed the smalltooth sawfish on the Endangered Species List, making it the first marine fish species to receive protection under the Endangered Species Act. Florida has also designated critical habitat areas to further protect its habitat. Mangrove Rivulus (Rivulus marmoratus) This small fish has not been identified within the Clam Bay system in previous surveys or field work but the mangrove habitat is appropriate and they could be present in the upper reaches of the mangrove forest. The mangrove rivulus is primarily a saltwater or brackish water species, with limited occurrence in freshwater. Within the Everglades and along Florida's west coast,this fish occurs in stagnant, seasonal ponds, and sloughs as well as in mosquito ditches within mangrove habitats. The mangrove rivulus is able to survive in moist detritus without water for up to 60 days during periods of drought, anaerobic, or high sulfide conditions. This fish can reach a maximum size of 2 inches (5 cm) in length, however it is more commonly observed at lengths between 0.4-1.5 inches (1.0-3.8 cm). The head and body are maroon to dark brown or tan, with small dark spots and speckling on the body,particularly the sides. The dorsal surface is always darker than the creamy ventral surface. The color of the body is reflective of the habitat, with light coloration in areas of light colored sediments and darker coloration in environments with dark leaf litter substrates. A large dark spot surrounded by a band of yellow is located at the upper base of the caudal fin in hermaphroditic individuals. Males lack this dark spot and have a red- orange cast to their flanks and fins. The mangrove rivulus was once listed as a threatened species in the Gulf of Mexico. However, recently additional surveys have revealed the existence of numerous populations. In Florida it has been downlisted to a species of special concern. In 1999, it was submitted by the National Marine Fisheries Service as a candidate for protection under the Endangered Species Act. As of yet, it has not been officially listed as endangered or threatened. The main threat to the survival of the mangrove rivulus is habitat degradation and destruction as well as exposure to pollutants. Disturbances that alter salinity and temperature as well as vegetation cover may also reduce naturally occurring populations. Loggerhead Sea Turtle (Caretta caretta) Loggerhead sea turtles have been documented nesting on beaches within the Clam Bay NRPA. Loggerheads are circumglobal, occurring throughout the temperate and tropical regions of the Atlantic, Pacific and Indian Oceans. They are the most abundant species of sea turtle found in the U.S. coastal waters. In the Atlantic, the loggerhead turtles range extends from Newfoundland to as far south as Argentina. During the summer, nesting occurs primarily in the subtropics. Although the major nesting concentrations in the U.S. are found from North Carolina through southwest Florida, minimal nesting occurs outside of this range westward to Texas and northward to Virginia. Adult loggerheads are known to make extensive migrations between foraging areas and nesting beaches. During non-nesting 49 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 years, adult females from U.S. beaches are distributed in waters off the eastern U.S. and through the Gulf of Mexico, Bahamas, Greater Antilles, and Yucatan. Loggerheads were named for their relatively large heads, which support powerful jaws and enable them to feed on hard-shelled prey, such as whelks and conch. The top shell (carapace) is slightly heart- shaped and reddish-brown in adults and sub-adults, while the bottom shell (plastron) is generally a pale yellowish color. The neck and flippers are usually dull brown to reddish brown on top and medium to pale yellow on the sides and bottom. In the southeastern U.S., mating occurs in late March to early June and females lay eggs between late April and early September. Females lay three to five nests, and sometimes more, during a single nesting season. The eggs incubate approximately two months before hatching sometime between late June and mid-November. Loggerheads occupy three different ecosystems during their lives: beaches(terrestrial zone),water (oceanic zone), and nearshore coastal areas ("neritic" zone). Because of this,NOAA Fisheries and the U.S. Fish and Wildlife Service(USFWS)have joint jurisdiction for marine turtles, with NOAA having the lead in the marine environment and USFWS having the lead on the nesting beaches. The loggerhead turtle was first listed under the Endangered Species Act as threatened throughout its range on July 28, 1978. In September 2011,National Marine Fisheries Service(NMFS) and USFWS listed 9 Distinct Population Segments of loggerhead sea turtles under the Endangered Species Act (ESA). The population in our Northeast Atlantic Ocean Segment is listed as endangered. The agencies are currently proposing Critical Habitat designations on several areas which contain a combination of nearshore reproductive habitat, winter area, breeding areas, and migratory corridors. The Clam Bay NRPA is contained within the LOGG-N-27 segment of this proposed critical habitat area. Gopher Tortoise (Gopherzus polyphemus) Gopher tortoises and their burrows are found along the coastal strand portions of the Clam Bay NRPA. The range of the tortoise includes southern portions of Alabama, South Carolina, Louisiana, Mississippi, and Georgia as well as most of Florida. Gopher tortoises are one of the few species of tortoise that dig burrows. These burrows can be up to ten feet deep and 40 feet long, and are as wide as the length of the tortoise that made it. In addition to providing the tortoise a home, it has been documented that as many as 350 other species also use the burrows including the indigo snake, Florida mouse, gopher frog, and burrowing owl. Gopher tortoises can live 40 to 60 years in the wild and average 9 to 11 inches in length. These tortoises are superb earth-movers, living in long burrows from 5 to 45 feet long and up to 10 feet deep that offer refuge from cold, heat, drought, forest fires, and predators. The burrows maintain a fairly constant temperature and humidity throughout the year and protect the gopher tortoise and other species from temperature extremes, drying out, and predators. The mating season generally runs from April through June and gestation for the eggs is between 80 and 100 days. 50 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 The shell or"carapace" of the gopher tortoise is mostly brownish gray and the underside of the shell, or "plastron," is yellowish tan. Their front legs are shovel-like which helps them when digging their burrows. The gopher tortoise has been regulated in Florida since 1972 and has been fully protected since 1988. Despite the afforded protection, gopher tortoise populations throughout the state have declined. As a response to the continuing decline of the species, a new management plan was drafted and approved in September 2007 as a precursor to reclassifying the gopher tortoise from a "species of special concern" to a "threatened species." The threatened status was approved and went into effect on November 8, 2007. Piping Plover (Charadrius melodus) Piping plovers have been rarely sighted foraging or resting along the shoreline within the Clam Bay NRPA boundaries. No nesting activities have been documented within the NRPA. Piping plovers are small shorebirds approximately seven inches long with about a 19 inch wingspan. They have sandy/grey colored plumage on their backs and crown and white underparts. Breeding birds develop a single black breast band, a black bar across the forehead, bright orange legs, and bill with a black tip on the bill. During the winter, the birds lose the black bands, the legs fade to pale yellow, and the bill becomes mostly black. Piping plovers breed in three geographic regions of North America: the Atlantic Coast(which is where the Clam Bay NRPA is located), the Northern Great Plains, and the Great Lakes. Nesting in the Atlantic Coast region occurs on coastal beaches, sand flats, and bars associated with barrier islands, gently sloped and sparsely vegetated dunes, and washover areas cut into or between dunes. Plovers from all three breeding populations winter along South Atlantic, Gulf Coast, and Caribbean beaches and barrier islands,primarily on intertidal beaches with sand and/or mud flats with no or very sparse vegetation. Piping plover populations were federally listed as threatened and endangered in 1986. The Northern Great Plains and Atlantic Coast populations are threatened, and the Great Lakes population is endangered. Piping plovers are considered threatened throughout their wintering range. The highest concentration of birds reported in winter censuses are found in Texas, Louisiana, and Florida. In recent decades,piping plover populations have drastically declined as breeding habitat has been replaced with shoreline development and recreation. (USFWS). West Indian Manatee(Rivulus marmoratus) Manatees have been sighted on numerous occasions within the Clam Bay NRPA boundaries. Manatees can be found in shallow, slow moving rivers, estuaries, saltwater bays, canals, and coastal areas particularly where seagrass beds or freshwater vegetation flourish. Manatees are a migratory species. Within the U.S., they are concentrated in Florida in the winter. In summer months, they can be found as far west as Texas and as far north as Massachusetts, but summer sightings in Alabama, Georgia and South Carolina are more common. 51 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Manatees are large, gray aquatic mammals with bodies that taper to a flat,paddle-shaped tail. They have two forelimbs, called flippers, with three to four nails on each flipper. The average adult manatee is about 10 feet long and weighs between 800 and 1,200 pounds. They eat a large variety of submerged, emergent, and floating plants and can consume 10-15% of their body weight in vegetation daily. Because they are mammals,they must surface to breathe air. They rest just below the surface of the water, coming up to breathe on an average of every three to five minutes. It is believed that one calf is born every two to five years, and twins are rare. The gestation period is about a year. Mothers nurse their young for one to two years, during which time a calf remains dependent on its mother. Protections for Florida manatees were first enacted in 1893. Today, they are protected by the Florida Manatee Sanctuary Act and are federally protected by both the Marine Mammal Protection Act and the ESA. Other Species Plant Species—List based on FLUCFCS Mapping Table 5: Representative Plant Species found within the NRPA Boundary FLUCFCS Code 181 — Swimming Beach COMMON NAME SCIENTIFIC NAME Seagrape Coccoloba uvifera Sea Oats Uniola paniculata Railroad vine Ipomoea pes-caprae FLUCFCS Code 322—Coastal Scrub COMMON NAME SCIENTIFIC NAME Seagrape Coccoloba uvifera Cabbage Palm Sabal Palmetto Buttonwood Conocarpus erectus Spanish Bayonet Yucca aloifolia Saltbush Baccharis halimifolia Beach Naupaka Scaevola taccada FLUCFCS Code 428—Cabbage Palm Hammock COMMON NAME SCIFNTIFIC NAME Cabbage Palm Sabal palmetto Seagrape Coccoloba uvifera Strangler Fig Ficus aurea Saffron Plum Sideroxylon celastrinum Coinvine Dalbergia ecastaphyllum Brazilian Pepper Schinus terebinthifolia Beach Naupaka Scaevola taccada 52 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 FLUCFCS Code 612—Mangrove Swamps (Forest) COMMON NAME SCIENTIFIC NAME Red Mangrove Rhizophora mangle White Mangrove Laguncularia racemosa Black Mangrove Avicennia germinans Buttonwood Conocarpus erectus Leather Fern Acrostichum danaeifolium Saltwort Batis maritima FLUCFCS Code 642—Salt Marsh COMMON NAME SCIENTIFIC NAME Lance-leaf Arrowhead Sagittaria lancifolia Needlerush Juncus roemerianus Bulrush Scirpus californicus Carolina Willow Salix caroliniana Peruvian Primrosewillow Ludwigia peruviana Animal Species The following list of species has been observed within the Clam Bay NRPA and the adjacent Pelican Bay development areas. These lists are not all inclusive but represent a wide array of the species found within and adjacent to the Clam Bay NRPA habitats. Aquatic Invertebrates From Conservancy Report Table 6:Aquatic Invertebrate species found within the NRPA boundary COMMON NAME SCIENTIFIC NAME American Oyster Crassotrea virginica Brittlestar Ophiophragmus filograneus Florida Crown Conch Melongena corona Grass Cerith Bittiolum varium Heart Urchin Moira atropos Painted Venus Clam Anomalocardia auberiana Shell-encrusted tubes Stout Razor Clam Tagelus plebeius Trumpet worm tubes Pectinaria gouldi Unidentified mud tubes Unidentified worm tubes 53 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Fish Table 7:Fish species found within the NRPA boundary COMMON NAME SCIENTIFIC NAME Atlantic needlefish Strongylura marina Barracuda Sphyraena barracuda Bay anchovy Anchoa mitchilli Blacktip Shark Carcharhinzus limbatus Blue crab Callinectis sapidus Cowfish Acanthostracion quadricomis Flounder Paratichthys alb!gutta Gray snapper Lutjanus griseus Great barracuda Sphyraena barracuda Gulf killifish Fundulus grandis Inshore Iizardfish Synodus foetens Killifish spp. Fundulus spp. Leatherjacket Oligoplites saurus Longnose killifish Fundulus simitis Mangrove snapper Lutjanus griseus Mullet Mugil cephalus Mutton snapper Lutjanus anatis Needlefish Strongylura marina Permit Trachinotus falcatus Pigfish Orthopristus chrysoptera Pinfish Lagodon rhomboides Pipefish Syngnathus spp. Puffer Sphoeroides parvus Sailfin molly Poecilia latipinna Sand perch Diplectrum bivittatum Scaled sardine Harengula pensacolae Sea robin Prionotus scitulus Sheepshead Archosargus probatocephal Sheepshead minnow Cyprinodon variegatus 54 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Silver jenny Eucinostomus gula Smalltooth Sawfish Pristis pectinata Snook Centropomus undecimalis Spot Leiostomus xanthurus Spotfinmojara Eucinostomus argenteius Spotted seatrout Cynoscion nebulosus Tidewater silverside Menidia peninsulae Triggerfish Batistes capriscus White grunt Haemulon plumierii Whiting Menticirrhus tittoratis Reptiles and Amphibians Table 8: Reptile and Amphibian species found within the NRPA Boundary COMMON NAME SCIENTIFIC NAME SNAKES Banded water snake Nerodia faciata faciata Black racer Coluber constrictor Common garter snake Thamnophis sirtalis Eastern coachwhip Masticophis flagellum Mangrove salt marsh water snake Nerodia clarkii Mud snake Farancia abacura Red rat snake Elaphe guttata guttata Ring-necked snake Diadophis punctatus Yellow rat snake Elaphe obsoleta LIZARDS AND CROCODILIANS American alligator Alligator mississippiensis Brown anole Anolis sagrei Brown basilisk lizard** Basiliscus vittatus Cuban knight anole** Anolis equestris Eastern glass lizard Ophisaurus ventralis Green anole Anolis carolinensis Southeastern five-lined skink. Eumeces inexpectatus 55 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 FROGS AND TOADS Cuban treefrog Osteopilus septentrionalis Eastern narrow-mouthed toad Gastrophryne carolinensis Eastern spadefoot toad Scaphiopus holbrookii Giant marine toad** Rhinella marina (fka Bufo marinas) Green treefrog Hyla cinerea Oak toad Anaxyrus qu.uercicus Southern leopard frog Lithobates sphenocephalus Southern toad Bufo terrestris Squirrel treefrog Hyla squirella TURTLES AND TORTOISES Chicken turtle Deirochelys reticularia Florida box turtle Terrapene carolina bauri Florida redbelly cooter Pseudemys nelsoni Florida snapping turtle Chelydra serpentina osceola Florida softshell turtle Apalone ferox Gopher tortoise Gopherus polyphemus Green sea turtle Chelonia mydas Loggerhead sea turtle Caretta caretta Penninsula cooter Pseudemys peninsularis Pond(yellowbelly) slider Trachemys scripta scripta Striped mud turtle Kinosternon baurii Birds Table 9: Bird species found within the NRPA Boundary COMMON NAME SCIENTIFIC NAME American avocet Recurvirostra americana American coot Fulica americana American kestrel Falco sparverius American oystercatcher Haematopus palliates American Robin Turdus migratorius Anhinga Anhinga anhinga 56 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Bald eagle Haliaeetus leucocephalus Barred owl Strix varia Belted kingfisher Megacetyle alcyon Black skimmer Rynchops niger Black vulture Rynchops niger Black-and-white warbler Mniotilta varia Black-bellied plover Pluvialis squatarola Black-crowned night heron Nycticorax nycticorax Black-necked stilt Himantopus mexicanus Blue jay Cyanocitta cristata Blue-gray gnatcatcher Polioptila caerulea Boat-tailed grackle Quiscalus major Brown pelican Pelecanus occidentalis Brown thrasher Toxostoma rz firm Budgerigar Melopsittacus undulates Caspian tern Hydroprogne caspia Cattle egret Bubulcus ibis Chuck-will's-widow Caprimulgus carolinensis Common grackle Quiscalus quiscula Common ground-dove Columbina passerina Common moorhen Gallini.da chloropus Common nighthawk Chordeiles minor Common snipe Gallinago gallinago Common tern Sterna hirundo Common yellowthroat Geothlypis trichas Double-crested cormorant Phalacrocorax auritus Dowitcher long-billed Limnodromus scolopaceus Dowitcher short-billed Limnodromus griseus Downy woodpecker Picoides pubescens Dunlin Calidris alpina Eastern screech owl Megascops asio Eurasian collared dove Streptopelia decaocto European starling Sturnus vulgaris Fish crow Corvus ossifragus 57 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Forster's tern Sterna forsteri Glossy ibis Plegadis falcinellus Gray catbird Dumetella carolinensis Great blue heron Ardea herodias Great crested flycatcher Myiarchus crinitus Great egret Ardea alba Great horned owl Bubo virginianus Greater yellowlegs Tringa melanoleuca Green heron Butorides virescens Green-winged teal Anas crecca Herring gull Lanes argentatus Hooded merganser Lophodytes cucullatus House sparrow Passer domestices Killdeer Charadrius vociferus Laughing gull Leucophaeus atricilla Least sandpiper Calidris minutilla Limpkin Aramus guarauna Little blue heron Egretta caerulea Loggerhead shrike Lanius ludoviciam.as Magnificent frigate bird Fregata magnificens Mangrove cuckoo Coccyzus minor Merlin Falco columbarius Mocking bird Mimes polyglottos Mottled duck Anas fulvigula Mourning dove Zenaida macroura Muscovy duck Cairina moschata Northern cardinal Cardinalis cardinalis Northern gannet Morass bassanus Northern parula Parula americana Northern waterthrush Seiurus noveboracensis Osprey Pandion haliaetus Painted bunting Passerina ciris Palm warbler Dendroica palmarum Peregrine falcon Falco peregrines 58 CLAM BAYNRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Pied-billed grebe Podilymbus podiceps Pilleated woodpecker Dryocopt-ts pileatus Piping plover Charadrius melodus Prairie warbler Dendroica discolor Purple gallinule Porphyrula martinica Red knot Calidris canutus Red-bellied woodpecker Melanerpes carolinus Red-breasted merganser Mergus serrator Reddish egret Egretta rufescens Red-shouldered hawk Buteo lineatus Red-tailed hawk Buteo jamaicensis Red-winged blackbird Agelaius phoeniceus Ring-billed gull Larus delawarensis Roseate spoonbill Platalea ajaja Royal tern Sterna maxima Ruby-throated hummingbird Archilochus colubris Ruddy turnstone Arenaria interpres Sanderling Calidris alba Sandwich tern Sterna sandvicensis Semipalmated plover Charadrius semipalmattts Snowy egret Egretta thula Spotted sandpiper Actitis macularia Swallow-tailed kite Elanoides forficatus Tri-colored heron Egretta tricolor Turkey vulture Cathartes aura Western sandpiper Calidris mauri White ibis Ettdocimus albus White pelican Pelecanus erythrorhynchos Willet Catoptrophorus semipalmatus Wood stork Scolopax minor Yellow-bellied sapsucker Sphyrapicus varius Yellow-crowned night heron Nyctanassa violacea Yellow-rumped warbler Dendroica coronata Yellow-throated warbler Dendroica dominica 59 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Mammals Table 10:Mammal species found within the NRPA Boundary COMMON NAME SCIENTIFIC NAME Big brown bat Eptesicus fuscus Bobcat Lynx ru firs Bottle-nosed dolphin Titrciops truncatus Brazilian free-tailed bat Tadarida braziliensis Coyote Canis latrans Eastern gray squirrel Sciurus carolinensis Eastern mole Scalopus aquaticus Feral domestic cat Felis cants Florida Black bear Ursus americanus floridanus Gray fox Urocyon cinereoargenteus House mouse Mus musculus Marsh rabbit Sylvilagus palustris Nine-banded armadillo Dasypus novemcinctus Raccoon Procyon lotor River otter Lutra canadensis Roof rat Rattus rattus Virginia opossum Didelphis virginia West Indian manatee Trichechus manants Hydrology Hydrological regime, sometimes referred to as the surface water or surficial hydrology, in simple terms describes the long term spatial variation in the water depths and period of inundation within a wetland system. This is because the surficial hydrology has both horizontal and vertical components and provides key ecological functions to the mangrove forest (Lewis,pers. comm., 2008). With respect to the horizontal component, incoming water(both tidal and surface water run-off) into an estuary brings with it nutrients, dissolved oxygen, and marginally lower salt concentrations. Conversely, the outgoing water leaving a mangrove wetland (through tidal exchange) removes metabolic waste products (e.g. carbon dioxide and toxic sulfides) and excess salt. The vertical component refers to incoming water that percolates down into the sediment and root zone, and the sediment drainage, on a falling, tide which removes metabolic wastes and excess salt. 60 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 It is the inflow and outflow of sea water that is critical to the ability of the estuary 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. 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. Another key aspect of the surficial hydrology is the vertical location of the water level elevation relative to the sediment elevation. Specifically, the mean low water(tide) elevation has to be sufficiently lower than the sediment elevation in order for sediments to drain during low tide. A persistent high surface water elevation stops sediment drainage and results in anoxic sediment and the accumulation of toxic waste products. The 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 61 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 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, Inc. would support this conclusion. (Turrell 1995). 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. For a 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. To function without mechanical intervention, the system must generate a sufficient volume of water on the ebb tide to scour out the inlet naturally, otherwise the inlet will, over time, continue to close. This is particularly true during periods of high wave activity and low tidal ranges. (Turrell 1995; Tackney 1996). The six closures of Clam Pass that have occurred in the past twenty-five years indicate that stability of Clam Pass is marginal. (Turrell 1995; Tackney 1996, Humiston 2010). 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). 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 27 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 predictable storm events that have the potential for altering the amount of average rainfall entering the Clam Bay system. 62 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 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 watershed 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 development 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 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. E _ ,,, -R, 4,14.4,,,,.-1,A-. .*.y iC_".4.,,,f..--.747,;•77_ ''''',1 r 7�S',;• _. 4s.c. }F rM ',,' 1r r+• ,�" . �� y- .,, f Z 1L. r� C• . t � C r s- . tea" a `. 41.4...c - ' r'-�.-N. t',--tit, i . rpp' r '3: 4 C+, ;10,- a'yil'''.)-4k::•441^>!,010.-• r. A el S:-• µ _ . ;.r A. # t'-r ,«{T; -. • „..,,,,k r ,,,,..*„.... •�. ._-'.. . .-'t:74%.,-.4144- m... .FF�cMkt Y< , s, -.. .:.a _. ,-q4,,,-'---m., BASIN 4 BASIN 3 ••.� -,-,--0 ,, ...,,, ' , BASIN 2 ,u a:Sh, "" 'Ti Ali ,1 .i'- ' 1,11._ ;. - �,i. ' :'' aa,:''1�p, . .—r .)pt iit'pit. } .;•;,- 4v,:...Xt l i.."4,\4411c1"ctor t "``' '''r'-`- .- r.a z.Al ,,t, V7 .+a C•",r 3 t BASIN 1 l+ F r,5 (idi 4 fyyVv Vli Yee �l a � ' �ti <<1 i �„ t } _- �4L ! ! •',TA •A,, 1` *1 r >!•� H�7 Ct 'c F � n• 'C�`.'� i _ � �i:. t S d `moi.. �1, r. i Fs -w: rf9P •.' L lir _ _ k»* . -rs w•R[. BASIN 6 11/4, . 11 n-s Figure 19:Approximate locations of Drainage Basins within the Pelican Bay Development(photo is oriented with north up and west to the left). 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 discernible as a very slight sheet flow. Where this water encounters a discharge system, even one that is not operating at peak efficiency(from an engineering,not historical, standpoint), such as Outer Clam 63 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 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. Water Quality During the initial environmental permitting of Pelican Bay, the agencies required water quality testing within the Pelican Bay subdivision and the Clam Bay estuary to help evaluate the impact of development on Clam Bay. The water quality testing program was first implemented by the Pelican Bay Improvement District (PBID) starting in the early 1980's. In 1990 the PBID became the Pelican Bay Services Division(PBSD), a dependent Division of Collier County. The PBSD continued the testing program after 1990. The PBSD is currently the responsible entity for the testing program. The water quality testing is performed at several sample points within Pelican Bay and Clam Bay. The sample point locations are shown on the exhibit below. There are currently nine sampling locations within Pelican Bay and Clam Bay. Sample points W-7 (located in the creek near the north Pelican Bay Foundation boardwalk); W-6 (located in the creek near the south Pelican Bay Foundation Boardwalk); W-1 (located near the kayak launch area at the southern end of Outer Clam Bay);North Seagate (located on the north side of the Seagate culverts between Venetian Bay and Outer Clam Bay); and Upper Clam Bay(located at the very north end of Upper Clam Bay) are within Clam Bay, which are categorized as Class II waters by the FDEP. The remaining five sampling points are PB-13 (located north of the Sandpiper parking lot on both sides of the berm); PB-11 (located between the St. Maarten condominium and the Commons on the east side of the berm); Glenview(located between the Glenview and Stratford condominiums on the east side of the berm); and St. Lucia(located adjacent to the St. Lucia condominium on the west side of the berm), are located in the stormwater treatment portion of the property(Class III waters)within Pelican Bay. 64 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division .37i.- ,x-::'--. # , 7: ',,,,,,i•VI .'ift V''',Akm,x ';i":4.' ... 11- 1'-‘'.' '.:•*,' . '''.- . ' Nita liitir May 1, 2014 Ver. 5.0 J ' f d y� #fie a,'t N t $,,- .y,_� ::- ,?,+ . t .fps�jfS • f t kG tia 1 '.' i 3 . :. q x'71`{ 4� . `_,. r i'' i -"fix .,, •,045tm., — ti ' n t'''' ',f, a t , f It t t ' ,jt t'k }N - ISI w.,z w a 2 v 'f i / +may , ,.t 4t< 1 f ,S• pt 7f�L r 11. ext ': ' 4 Ilr's.sFF 1 ....ell* tI .i` L• t` F'' P'£ o- j�6!'.�y, y9-•,,,i, ), ' ice•. rM t .'i 't , CSL .17.�":Z• - f t 1`l,!1 ;•,r to Q.C.. w 11,4'. --•4` V i./ i.�'F �{.r •1 '` !i J!�rct A ek. +1 f.I. . it.t! . '':'..' ---1 '' ...% .ir,ii,-..„:„-- .,..v.... .1.7. ..i. ,,, .., ._ ,r-i.,..-.-"tok.g..v4„, --: i - • ea YoYit I t 4f t 4w : f1 ¢ v. t,t,rc 141 f .!�__,Wr .444 f fIi2 ` i .11' io 3i1e .. ,44,.. „‘,1 ,.; 11.- 33 7•Nc•• Vii.. s Fig tire 20: Water Quality monitoring locations within the NRPA Boundary 65 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Water quality sampling is conducted within the Clam Bay system on a monthly basis. The samples are collected by PBSD staff and transported to the Collier County Pollution Control laboratory for processing. Parameters sampled and collected, include: • Field pH • Field Temperature • Field Salinity • Field Dissolved Oxygen • Ammonia • Carbon—Total Organic • Chlorophyll a • Copper* (added to the parameter suite in 2013) • Nitrate-Nitrite (N) • Nitrite(N) • Nitrogen—Total Kjeldahl • Orthophosphate(OPO4) • Pheophytin • Phosporus -Total • Residues—Filterable (Total Dissolved Solids (TDS)) • Silica(SiO2) Water quality sampling results of nutrient loading seem to indicate that the development stormwater management system is doing its job. No evidence of nutrient loading has been observed within the Class II waters though several spikes and elevated nutrient (N and P) levels have been observed from the testing locations along the berm. It is believed that the spikes observed are correlated with fertilizer application within the community. The FDEP conducted water quality sampling within the Clam Bay NRPA in 2001 and 2012. Based on their sample results, FDEP had made an initial determination that Clam Bay could be impaired for both Dissolved Oxygen(DO) and Copper. Subsequent coordination between FDEP, PBSD, the Pelican Bay Foundation, and involved consultants, FDEP made a determination that the oxygen levels in Clam Bay were natural and the system was not listed as impaired for DO. TMDL(Total Maximum Daily Load) are defined by the FDEP as the maximum amount of a given pollutant that a surface water can absorb and still meet water quality standards. FDEP did determine that the Clam Bay System was impaired for copper and was placing the Clam Bay system on the Everglades West Coast verified list for copper with medium TMDL priority(5 to 10 years for TMDL development). Subsequent copper testing undertaken by PBSD has also shown periodic elevated levels of copper within the Clam Bay Class II waters. FDEP acknowledged that the Pelican Bay community is developing an upland stormwater and nutrient management program that is designed to reduce nutrient and copper inputs into the stormwater system. Once completed,this program can be given to FDEP for review and if satisfied with the anticipated reduction of copper resulting from the implementation of the plan, the system could be removed from 66 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 the impaired list. While the upland nutrient management plan is not part of this Management Plan, PBSD will work closely with the Pelican Bay Foundation to coordinate and share information, and to integrate management decisions and activities into this Management Plan where appropriate. Archaeological Resources The Florida Division of Historical Resources Master Site File lists three known archaeological sites within the Clam Bay NRPA boundary. All three are located within the mangrove forest habitat. Two of the sites (CR476 and CR547) are located north of the Pass and south of Inner Clam Bay. The third site (CR576) is located south of the Pass and north of the Clam Pass Park boardwalk. Site CR476 is identified as a prehistoric campsite and shell midden possibly supporting the use of several cultures dating from 8500 B.C. to A.D. 1700. Sites CR547 and CR576 are identified as shell middens which were in used between 100 B.C. and A.D. 1700. All three of the sites are within the mangrove forest and outside of the footprint of any previous or future anticipated dredging activities. Inlet Dynamics Clam Pass is a small wave-dominated inlet on the southwest coast of Florida that provides a tidal connection to approximately 500 acres of wetland preserve. The relatively small tidal prism of Clam Bay provides a critical balance between tidal flow in and out of the inlet channel and littoral processes moving to the inlet. This affects the inlet hydraulic efficiency over time, especially when littoral transport rates are high due to period of high wave energy. The morphologic features of a tidal inlet include ebb shoal, flood shoal, and inlet channel. The flood shoal includes the sand shoals on the bay side of the inlet channel. The flood shoal is less dynamic than the gulf side of the inlet as it is influenced mainly by tidal flow and sheltered from the varying wave conditions on the open coast side. The ebb shoal features can be explained as sand bar features forming a delta on the open coast side of the inlet. The ebb shoal delta shields the inlet channel from waves and provides pathways for sand transport along the coast to bypass the channel without shoaling the inlet closed. 67 ,ii `...o.. CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 , I a, yc , ...,. cel' i( .L Vt XI 1.1.1 \1/44, „ : ,L. " — , Figure provided by Humiston&Moore A stable inlet system requires an ebb shoal feature that prevents rapid shoaling at the inlet mouth. The inlet channel maintains its flow cross section through tidal flow that scours the channel to required flow area while the waves are moving large amounts of sand along the coast. The stability and dynamics of a tidal inlet are based on the balance of the two forces of tidal flow versus wave-induced current and sand transport. The direction of wave action plays a significant role in the shape and dynamics of the inlet features. Clam Pass is critically stable but subject to shoaling, and therefore requires regular monitoring to determine if dredging is needed. The relatively small bay area compared to other estuaries in Southwest Florida provides adequate tidal flow to keep the Pass open under typical conditions. The narrow nature of the flood shoal area surrounded by the mangrove forest limits the flood shoal capacity to maintain an equilibrium volume and bypass additional sand to the gulf and bay waters. The accumulation of sand over long periods of time, especially within the flood shoal and inlet channel creates additional resistance to flow. This additional resistance causes a reduction in the tidal range within the bay system and consequently reduces the flow through the Pass. Maintenance dredging to restore flow rates may be needed. During the 1990's Clam Pass was subject to channel migration as well as closure, and dredging was necessary to keep the inlet open. In 1998 the Pelican Bay Services Division developed the Clam Bay Restoration and Management Plan that was approved by the Collier County Board of Commissioners. The purpose of the plan was t address the mangrove die-off by improving tidal flushing into and out of the mangrove forest areas. This was accomplished through the dredging of Clam Pass and portions of the interior channels within the system, as well as the construction of a network of hand-dug channels throughout the original die-off area and several other areas that were exhibiting stress. The implementation of the Clam Bay Restoration and Management Plan resulted in a significant increase of 68 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 the tidal prism compared to conditions prior to 1999 and the eventual recovery of over 90% of the original mangrove die-off area. Clam Pass requires regular monitoring to determine when dredging may be needed. In addition to the 1999 dredging, dredging occurred in 2002, 2007, and 2013. The 2013 dredging took place following inlet closure in late 2012. Following the passage of Tropical Storms Debbie and Isaac and high-energy wind and wave conditions during 2012,resulting in the complete closure of Clam Pass in December, 2012. The inlet was reopened in April, 2013 and tidal exchange between the bay and the Gulf of Mexico was restored to near design levels. Chapter 6.0 of this Management Plan outlines factors that will be considered prior to a deteimination to dredge Clam Pass. Recreational Use The Clam Bay NRPA provides a variety of opportunities for recreation such as walking, kayaking, canoeing,paddle-boarding, swimming, fishing, and snorkeling. Many Collier County residents and visitors enjoy the natural environment of the preserve. Recent Stakeholder input as well as prior reports supports the use of the Clam Bay NRPA for recreational endeavors. It is important that all who participate in low-impact recreational activities within the system do no harm to the unique flora and fauna. Clam Bay's dense forest of mangroves significantly limits walking in the preserve. Most walkers seeking to enjoy the rich natural environment of Clam Bay use the three boardwalks that cross the preserve and provide access to the beach. Residents and guests of Pelican Bay use the northern and middle boardwalks. The southernmost boardwalk is open to the public and accessed from the parking lot at the south end of the system. Trams are used on all three boardwalks to transport those choosing not to walk on the boardwalk to the beach. Kayaks, canoes, and paddleboards are used by those wanting to enjoy the natural setting and serenity of Clam Bay's waterways. There is a public launching area adjacent to the parking lot at the south end of Outer Clam Bay, and there is also a private launch for Pelican Bay residents on the northern boardwalk. The canoe/kayak trail is clearly designated by canoe trail markers from Outer Clam Bay to Upper Clam Bay. Fishing and swimming are also popular pastimes. Fishing can be done from the boardwalks and canoes or by wading into the water. Swimming is usually confined to the beach areas,but some swimmers and waders, if conditions permit, venture into Clam Pass. The operation of motorized watercraft in Clam Bay was restricted by Collier County Ordinance 96-16 that requires vessels with motors to travel at idle speed with no wake throughout the Clam Bay system. This ordinance is no longer consistent with Florida Statutes, therefore the PBSD is currently undertaking the modification of the ordinance to be consistent with current state statutes and FWC guidelines. The relatively shallow waterways of the system, in conjunction with the boardwalk 69 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 heights, limit the size and drafts of motorized watercraft. Some residents of the Seagate neighborhood immediately south of Outer Clam Bay have historically utilized motorized watercraft in Clam Bay. Violation of the proposed ordinance will be a civil infraction for which a fine may be levied. Occasionally motorized vessels, including jet-skis or other personal watercraft, have been reported to be operating at unsafe speeds. Efforts to identify and report violators will continue to insure that Clam Bay is not only a safe place for all its users,but that its unique environment is protected. In the future should any adverse effects on Clam Bay's natural resources or water quality be found to be related to motorized watercraft, additional management options will be explored to ameliorate these adverse effects. 70 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 4.0 Authorized Construction Activities List of Permits for Work Undertaken to Date and Relevant Legal Framework Eighteen years ago, 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 USACE 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 17, 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 re-vegetation. 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 Management 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. Subsequently, 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 an open condition. The application, as filed, did not address any other issues affecting the operational characteristics of Clam Bay and essentially mirrored the 1996 Permit described in the first paragraph above. Agency comments and concerns which arose as part of the permit review led to the creation of the 1998 Clam Bay Restoration and Management Plan. The Management Plan addressed agency concerns at the time and included provisions for adding one-way flap gates to the Seagate culverts, dredging within three sections of the creek north of Clam Pass, a network of hand dug channels throughout the forest area, in addition to the dredging of the Pass. This permit was issued in 1998 and the Management Plan created in support of the permit has been the guiding document for the maintenance activities undertaken in the Clam Bay system since then. It is anticipated that FDEP and USACE 10-year permits will be sought in conjunction with this new Management Plan. The permits will allow for ongoing maintenance activities to continue along with occasional,modest removal of material by dredging within a discreet area of Clam Pass in order to 71 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 maintain the existing tidal regime within the system. Any changes to the submitted dredging scope or other new management initiatives will be reviewed by the PBSD Board and Collier County Commissioners before seeking any additional permit(s) which may be necessary for the modified activities. Additional investigations which may be undertaken at a later date to look at, for example, faunal investigations,more in-depth water quality concerns, or other issues that may arise as a result of Stakeholder discussions could also necessitate permitting which will have to be reviewed by the PBSD and BCC prior to any such peimit applications being submitted. This Management Plan is specifically tasked to maintain the improvements and benefits already realized and to insure that the restoration success observed to date is continued. Dredging for navigation or beach renourishment will not be done. The following list contains more details related to existing and historical permits issued for the Clam Bay system. Permit Details South Florida Water Management District Surface Water Permit No.: 11-00065-S Date of Issue: August 10, 1978 Expiration Date: Operational phase doesn't expire Project Description: To construct and operate water management systems 1 and 2 serving 539 acres of residential lands discharging by westerly sheet flow to Inner, Outer, and Upper Clam Bays. 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 72 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Project Description: This was an extension of the permit authorizing the filling of 75± acres of mangrove wetlands north, east, and west of Upper Clam Bay and south of Vanderbilt Beach Road,plus approximately 2 acres of mangroves at the existing Collier County beach access at Vanderbilt Beach Road. The request was reviewed and no objections were raised to the proposed work schedule; therefore,the completion date of the permit was extended for 2 years until November 18, 1986. South Florida Water Management Plan Modification of Surface Water Management Permit No.: 11- 00065-S Date of Issue: December 15, 1983 Expiration Date: Operational phase doesn't expire 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 Perrrrit/Certification No.: 110974055 Date of Issue: September 12, 1985 Expiration Date: September 11, 1987 Project Description: To construct approximately 2900 linear feet of 10' wide public access elevated boardwalk and pier with a 6' wide navigation access lift gate in Outer Clam Bay. Department of the Army Corps of Engineers 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.: 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/Certification No.: 112659015 Date of Issue: March 14, 1995 Expiration Date: March 14, 2000 Project Description: Re-establish the connection between the Gulf of Mexico to the Clam Bay system, by dredging from the mouth of Clam Pass and spoiling the sand over an upland beach site. Collier County Ordinance No.: 96-16 Date of Issue: April 9, 1996 Expiration Date: n/a Project Description: To impose idle speed/no wake zones in the Clam Bay system. Department of Environmental Protection Permit/Authorization No.: 0128463-001-JC Date of Issue: July 6, 1998 73 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Expiration Date: July 6, 2008 Project Description: This Permit authorized activities 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: August 11, 1998 Expiration Date: July 8, 2008 Project Description: This Permit authorized the following works: 1.) Replacement of Seagate Drive Culverts and installation of one-way check valves on the culverts (pages 45-50 of the CBRMP); 2.) Clam Pass main channel dredging for Cuts 1, 2, 3 and 4(pages 49-65 of the CBRMP); 3.) Excavation and maintenance of Interior Tidal Creeks (pages 65-71 of CBRMP). Department of Environmental Protection Permit Modification for Permit No.: 0128463-001-JC Date of Issue: February 16, 1999 Expiration Date: July 6, 2008 Project Description: Authorize minor revisions to the mangrove trimming procedures pursuant to site verification. Department of the Army Corps of Engineers Modification for Permit No.: 199602789 (IP-CC) Date of Issue: February 26, 1999 Expiration Date: July 8, 2008 Project Description: This application requested modification to: 1.) discharge 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 Environmental Protection Permit Modification for Permit No.: 0128463-001-JC Date of Issue: May 19, 1999 Expiration Date: May 28, 1999 Project Description: Re-grade beach fill material during the marine turtle nesting season to remove pockets of fine silty material and to remove an escarpment which may interfere with nesting marine turtles. Florida Fish and Wildlife Conservation Commission File No.: 2003-0511-016BS for Permit No.: CO- 016 Date of Issue: March 24, 2000 Expiration Date: n/a Project Description: This Permit granted approval for placement of canoe trail markers in Clam Bay. Department of the Army Corps of Engineers for Permit No.: 200001076 (NW-EF) Date of Issue: April 13, 2000 Expiration Date: February 11, 2002 74 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Project Description: Approved the installation of 32 waterway markers for a canoe trail in the Clam Bay System. Department of the Army Corps of Engineers modification for Permit no.: 199602789 (IP-CC) Date of Issue: May 5, 2000 Expiration Date: July 8, 2008 Project Description: This application requested modifications to the monitoring and reporting schedule reference 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 Environmental Protection Permit No.: CO-732 Date of Issue: October 25, 2002 Expiration Date: October 25, 2003 Project Description: Perform dune and beach restoration, and plant salt-tolerant native dune vegetation in association with interim maintenance dredging event. Department of the Army Corps of Engineers Permit No.: 199602789 (IP-CC)Extension Date of Issue: May 8, 2008 Expiration Date: July 8, 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: June 5, 2008 Expiration Date: July 6, 2009 Project Description: This modification extends the expiration date for a period of one year. Department of Environmental Protection Permit No.: 11-0128463-005 Date of Issue: December 17, 2010 Expiration Date: December 17, 2015 Project Description: Continue maintenance activities to the hand-dug channels in the Clam Bay system originally permitted under Permit No. 0128463-001-JC. Department of the Army Corps of Engineers Permit No.: SAJ-1996-02789 (IP-LAE) Date of Issue: February 8, 2011 Expiration Date: February 8, 2021 Project Description: Continue maintenance activities to the hand-dug channels in the Clam Bay system originally permitted under Permit No. 1996-02789 (IP-CC) Department of Environmental Protection Pemiit No.: 11-0295193-004 Date of Issue: November 2, 2011 Expiration Date: November 2, 2016 Project Description: Install 32 canoe trail markers and informational signage. 75 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Department of Environmental Protection Permit No.: 0296087-001-JC Date of Issue: August 14, 2012 Expiration Date: August 14, 2022 Project Description: Restore the alignment of Clam Pass to the previously approved location and conducting periodic maintenance dredging of a portion of the Clam Pass Channel in order to maintain tidal exchange between Clam Bay and the Gulf of Mexico. United States Fish and Wildlife Service Biological Opinion Activity Code No: 41420-2010-CPA-0395 Date of Issue: February 22, 2013 Expiration Date: n/a Project Description: FWS analysis of the potential effects of the dredging of the Pass on the threatened piping plover(Charadrias melodus), threatened loggerhead sea turtle (Caretta caretta), endangered hawksbill (Eretmochelys imbricate), leatherback(Dermochelys coriacea), green(Chelonia mydas), and Kemp's ridley(Lepidochelys kempii) sea turtles, and the endangered West Indian Manatee Trichechus manatus). Department of the Army Corps of Engineers Permit No.: SAJ-1996-02789 (NWP-WDD) Date of Issue: February 28, 2013 Expiration Date: March 18, 2017 Project Description: Dredging of Clam Pass and tidal creek to restore tidal exchange into Clam Bay. Department of Environmental Protection Permit Modification to Permit No.: 0296087-002-JN Date of Issue: March 1, 2013 Expiration Date: August 14, 2022 Project Description: Modification of August 2012 permit to re-open Clam Pass by mechanical dredging of the Pass and flood shoal areas. 76 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 5.0 Management Plan Goal and Supporting Objectives The following goal and supporting objectives for the management of the Clam Bay Natural Resource Protection Area were developed in accordance with the directives of the Collier County Board of Commissioners (BCC) and the Pelican Bay Services Division(PBSD), which serves as an advisory board to the BCC. The goal and supporting objectives were formed in conjunction with stakeholder input and are based on the management issues present in the preserve as well as the purposes for which the land is held in public trust. The document goal and supporting objectives set forth in this Management Plan should not appreciably change over time but the management techniques and activities proposed may be modified based on on-going coordination with Stakeholder and user groups or when management objectives are not being met. Management concerns are addressed in the following sections along with the management techniques or activities proposed for addressing those concerns. The ability to implement specific goal objectives presented in this Management Plan will be based on funding and staffing availability. The following framework was identified during the Stakeholder and PBSD committee meetings. GOAL The goal of the Clam Bay NRPA Management Plan is to protect, preserve, maintain, and monitor the native floral and faunal communities to ensure protection and long-term sustainability of the NRPA's natural resources by incorporating, evaluating, and prioritizing all relevant information about the estuary into a cohesive management strategy that allows for recreational activities within its boundaries,while protecting the long-term health of the ecosystem and its natural and historical resources. Objectives to support this goal include: 1. Maintain and protect the native floral and faunal communities within the Clam Bay NRPA 2. Ensure the estuary had adequate tidal and freshwater flows to maintain ecological health within the Clam Bay NRPA 3. Monitor, maintain, and where possible and economically feasible, enhance water quality within the Clam Bay NRPA 4. Protect archaeological sites within the Clam Bay NRPA 5. Ensure recreational activities are environmentally compatible within the Clam Bay NRPA These objectives were formed to allow for adaptive management, whereby the compilation and analysis of all data will occur holistically and provide direction to adjust strategies to better achieve the goal. 77 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Objective 1—Maintain and protect the native floral and faunal communities within the Clam Bay NRPA A. Maintain healthy, native floral and faunal populations • Establish plots and photo points in Scrub and Hammock habitats and monitor annually as needed if funding is available. • Monitor annually established plots in the mangroves. • Monitor annually established transects in the seagrasses. • Documents annually observed wildlife utilization. • Conduct bird surveys as needed to keep species list current and in support of on-going management activities. Repeat surveys every three years as needed and if funding is available. • Conduct fish surveys as needed to keep species list current and in support of on-going management activities. Repeat surveys every three years as needed and if funding is available. • Monitor benthic organisms and then every five years as needed and if funding is available. • Review monitoring results annually and make recommendations for adapting management strategies as appropriate. B. Protect Listed Species • Monitor gopher tortoise burrows and then every three years as needed and funding is available. • Monitor sea turtle nesting and then annually as needed and if funding is available. • Add to current species lists as new species are sighted. • Conduct surveys as needed prior to disturbance events. • Update educational information on species, such as the Clam Bay Field Guide, as needed. • Review monitoring results annually and make recommendations for adapting management strategies as appropriate. C. Remove Exotic and Nuisance Flora and Fauna • Locate and identify exotic, nonnative, and nuisance species. • Remove Category I and II invasive exotic species and nuisance species as appropriate. • Report all monitoring results in an annual report. • Make recommendations annually to improve conservation strategies. 78 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Objective 2—Ensure the estuary has adequate tidal and freshwater flows to maintain ecological health within the Clam Bay NRPA A. Identify the minimum tidal flow necessary to ensure a healthy ecosystem. Provide sufficient tidal exchange to maximize benefits while minimizing negative environmental impacts. • Conduct an annual bathymetric survey of Clam Pass. • Conduct an initial bathymetric survey of interconnecting waterways and in subsequent years as needed and funding is available. • Conduct an annual analysis of tidal data. • Maintain tidal gauges. • Determine through regular biological monitoring whether ecological health warrants intervention strategies. • Consider the need for dredging if data documents the need. See Chapter 6 for more detail. • Seek appropriate federal and state permits needed to maintain adequate tidal and freshwater flow in the Clam Bay NRPA. B. Ensure appropriate freshwater inputs and drainage • Conduct annual monitoring of hand-dug channels. • Perform annual maintenance of selected sections of hand-dug channels. • Conduct bathymetric survey as needed in interconnecting waterways. • Consider the need for intervention strategies if data documents the need. Objective 3— To monitor and maintain water quality within the Clam Bay NRPA A. Develop a long-term water quality program that assesses the physical,chemical, and biological processes to ensure a sustainable healthy environment for all users • Continue program of monthly water quality data collection, making certain that it complies with FDEP guidelines and standards and addresses the Site Specific Criteria approved by FDEP. • Report and review water quality data on a quarterly basis that includes comparing recent data to historical data. • Develop intervention strategies when results do not meet standards. • Enter data into STORET system on an annual basis. • Develop a plan to address copper impairment in Clam Bay. • Develop a plan to assess freshwater and saltwater inputs within the watersheds. 79 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 B. Promote comprehensive programs for controlling water pollution from point and nonpoint sources • Continue to work with PBSD Landscape and Water Management Committee to reduce the copper in upland stormwater ponds in Pelican Bay. • Continue to work with PBSD Landscape and Water Management Committee to reduce the use of fertilizer in Pelican Bay. • Continue to work with PBSD Landscape and Water Committee to increase the use of Best Management Practices in Pelican Bay. • Seek to deteinline the possible impact of upland use on water quality in the Clam Bay NRPA. Objective 4—Monitor archaeological sites within the Clam Bay NRPA A. Monitor conditions of know archaeological sites. • Review historical records of Florida Division of Historical Resources(DHR) on known archaeological sites. • Establish baseline conditions of known archaeological sites. • Inspect known archaeological sites at least annually. • Report findings as appropriate to DHR. B. Implement strategies for the protection archaeological sites as needed. Objective 5—Ensure recreational activities are safe and environmentally compatible within the Clam Bay NRPA A. Monitor access and condition of the facilities for recreational uses. • Inspect facilities at least three times per year. • Report vegetation or litter needing to be trimmed or removed to responsible entity. • Report facilities needing repair or replacement to responsible entity. B. Maintain existing canoe trail. • Inspect signage at least three times per year. • Repair/replace signage as needed. • Revise/reprint canoe trail guide as needed. C. Maintain existing signage for safe swimmer and boater usage. • Inspect signage at least three times per year. • Repair/replace signage as needed. D. Monitor use of facilities/area for recreational uses. • Establish a mechanism for citizens to report incidents of unlawful, unsafe, and/or environmentally harmful use. • Coordinate with Collier County Sheriff's Department as appropriate. 80 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 • Develop materials to guide recreational use as needed. E. Maintain materials to educate visitors about the unique features of the Clam Bay NRPA • Report signage needing repair/replacement to responsible entity. • Develop new educational signage as needed. 81 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 6.0 Factors to Consider for Dredging of Clam Pass There are two circumstances that could necessitate dredging. The first is if Clam Pass closes completely due to a storm or natural event or is in eminent danger of immediate closure following a weather-driven event. In this situation the inlet should be dredged as soon as possible. The second is if the inlet has lost hydraulic efficiency that is not recoverable through natural processes, jeopardizing the health of the floral and faunal communities of the Clam Bay NRPA. This determination is made by reviewing and comparing current and past data from tidal hydraulic and bathymetric monitoring as well as the potential negative impact on the health of the floral and faunal communities of the Clam Bay NRPA. In both cases the Pelican Bay Services Division Board would approve and recommend an appropriate set of construction drawings for the dredging event to the Board of County Commissioners for its approval prior to their submittal to the regulatory agencies. Dredging will only be done for the health of the Clam Bay NRPA, not for navigation or beach renourishment, though beach compatible sand removed as part of the dredging activities will be spread on area beaches. Monitoring Clam Pass The purpose of regular monitoring is to evaluate inlet characteristics on a comprehensive long-term basis with less emphasis on short-teilu or seasonal changes. Data on the below-listed variables will be regularly collected and used to determine if dredging is needed. Bay Tide Range Tidal range data have been collected annually since 1999 and will continue to be collected and reported to the consulting engineer monthly. An annual tidal analysis report will continue to be completed. Data is collected from gauges at four locations (Class Pass Park Boardwalk, Pelican Bay South Boardwalk, Pelican Bay North Boardwalk, and Upper Clam Bay). These gauges provide a record of the tidal range in the bay that is an indicator of the tidal prism or volume of water flowing through Clam Pass at each tidal cycle. Based on an analysis of data from the gauges at the South Boardwalk and the Clam Pass Park Boardwalk from 1998 to the present when the inlet was hydraulically stable, the ratio between the bay and Gulf tide was between 0.6 to 0.7 over 90% of the time. Therefore, if the ratio between the bay and 82 CLAM BA YNRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Gulf tide falls below 0.6,but above 0.5, further monitoring and/or intervention should be considered. If the tidal range ratio falls below 0.5 for three consecutive months,physical monitoring of potential shoaling areas that could be impeding flow should be considered. Gulf Inlet Bay a -. ra, x Gulf Tide Range 'tt• e Bay Gulf , x {o rdi/af -. '. • • 'f c Clam Bay Tidal Range figure provided by Humiston&Moore) t Registry Board Walk lit South Beach Board Walk 0.90 __._t -_-- . ii 0.80 $ .. ' o is - Stable o• 0.70 At rg 0.60 -; '3— _i--2'-- _, ._ i a - -- - .-- Critical to 0.50 _� �� cc �a " us __ r 0.40 1 . ._.® .. ® _.. ® Unstable +u lig to mom 0.30 _. -_ a 0.20 011/1 .10 M . y — 1 III II 1 ; e 1996 1998 2000 2002 2004 2006 x008 2010 2012 2014 l 1999 2002 Year 2007 I 12013 i dredging dredging dredging dredging Clam Bay Tidal Range Ratios(figure provided by Humiston&Moore) Cross Section of Flow Area and Volume of Shoaled Material Annual bathymetric surveys and reports were completed from 1999 to 2008. Post-dredging bathymetric surveys and reports were completed at 3-month, 6-month, and 12-month intervals following the opening of Clam Pass in April, 2013. Going forward bathymetric surveys and reports will be completed at least annually, and additional surveys should be considered if the hydraulic 83 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 efficiency falls below target levels. Bathymetric surveys provide data on the physical conditions of the inlet channel, ebb shoal and flood shoal. To establish benchmarks or targets for these variables the data analysis included evaluation of the flow cross-section areas in the three main sections of the dredging template. Section A represents the inlet channel; Section B the seaward part of the flood shoal; and Section C the bay side part of the flood shoal. t y i,+ M� 1 +� 3 rtJ y + •SSI i� - , r egmentA' zt Figure provided by Humiston&Moore The analysis included evaluation of the cross section of flow between mean high water and the volume of sand within each segment. The cross section of flow was computed at each survey station spaced approximately 50 feet apart. The average and minimum cross section areas were used as indicators of the physical condition of the flow area of the three segments. The cross sections were compared to the design cross section area of the 2013 dredging and the inlet conditions in 2004 and 2008 when inlet conditions were near equilibrium 24 months and 16 months,respectively, following a dredging event. Targets for the average cross-section of flow areas: Section A greater than 300 sq ft. Section B greater than 450 sq ft Section C greater than 400 sq ft. Targets for the minimum cross-section flow areas: Section A greater than 250 sq ft. Section B greater than 350 sq ft. Section C greater than 350 sq ft. 84 CLAM BA YNRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Targets for volume of shoaled materials Section A less than 3000 cu. yds. Section B less than 2500 cu yds. Section C less than 4000 cu yds. Therefore, if the average cross-section of flow area falls below these numbers or the volume of shoaled material exceeds these numbers, further monitoring and/or intervention may be needed. Section A Design Criteria and Monitoring Data Cross-section Cross-section Volume within Avg(ft2) Min (ft2) Template(yd3) 2004 500 '.'Q 000 2008 340 250 3500 2013 Design 312 312 0 Target >300 >25C <3000 Post Const 300 300 0 3m post 340 220 2500 6m post 375 250 2100 12m post 470 300 2800 85 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Section C rx riteria and Monitoring Data ..x.o a s e .. _ , .. w. _ I Cross-section Cross-section Volume within Avg(ft2) Min (ft2) - Template(yd3) 2004 %15 515 4300 2008 660 470 420 Design 450 400 0 Target >450 >350 <4000 Pre `13 dredge 400 300 6500 Post '13 dredge 500 400 4500 3m post 425 375 5000 6m post 400 350 5000 Section B ,: Design Criteria and Monitoring Data I n Cross-section Volume within Avg(ft2) Min (ft2) Template(yd3) .A 2004 470 3 15 7 i 00 2008 425 ;35 -,.500 2013 Design 650 350 0 Target >450 >350 <2500 Pre Const 200 150 5500 Post Const 650 350 0 3m post 550 450 2750 6m post 500 400 3200 12m post 325 275 5050 12m post 300 300 5700 86 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1,2014 Ver. 5.0 Inlet Channel Length The channel length is an important factor in the inlet stability parameters. A longer inlet channel will provide greater resistance to flow. Higher flow resistance will reduce the tidal range and increase the phase lag with the gulf tide that reduces the tidal prism and flow through Clam Pass. To establish a benchmark for channel length a selection of aerial photos of Clam Pass from 2004 to 2013 were studied as well as data on the approximate length of the channel following dredging events in 2002, 2007, and 2013. Based on this analysis,the benchmark for target for inlet channel length is less than 400 feet. December 2002 October 2005 May2007 November 2003 • t "ry tl December2008 Apr112010 April 2012 March 2013 Clam Pass Channel Evolution 2004-2013 figure provided by Humiston&Moore) Approximate Channel Length 700 Drecged Ape)2007 Drecged AprO 2013 Goo- aim 300- r5 200 10x1- 1/14/2004 4/28/2003 10/10/2004 2/22/2008 7/4/2009 11/13/2010 4/1/2012 8/14/2013 12/27/2014 Date 87 ,rt CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Approximate length of inlet channel over time figure provided by Humiston&Moore) I 17 11 L(ft) 4 urea <400 -r 0.4 Pre .600 const Post 350 Apr Const 3m 300 post I 6m 400 post 3p I tA 32m 4501/4 post u / rzs ' ; - kt ® Channel k, ! ' j SwashZone 'I t I=Beach ..i20 • 'tr ttt,2vl44 t.I;<tOt' Ui Inlet channel length(figure provided by Humiston&Moore) Ebb Shoal The size and shape of the ebb shoal is a key factor to the stability of the inlet that supports the stability of Clam Pass. The ebb shoal helps to keep the inlet open when facing storms and big wave events. The ebb shoal delta provides sheltering to the channel and sand bypass pathway around the inlet without filling in the Pass. The shape and volume of the ebb shoal are additional indicators of the stability of the inlet. Ebb shoal critical conditions include onshore collapse of the ebb shoal that can be indicated by significant change in ebb shoal offshore distance, volume, and increase in dry beach areas adjacent to the inlet. The recommended length of the seaward extent of the ebb shoal is less than 250 feet. Therefore, if the length becomes more than 250 feet, further monitoring and/or intervention may be needed. 88 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 I Seaward Ebb Shoal Ebb Shoal ' 5 "x. Extent of Ebb Area Size Shoal(ft) (ft') (yd3) , > . 2008 345 255,000 2 750 is . s i. Target >250 200,000 25,000 ! y 41 IS li Pre const 115 110,000 10,000 Apr 2013 _1 Aug2Op\ Ai : w1 42.. Post Const 80 115,000 8,300 3m post 245 110,000 13,000 -": i,, j .`; 6m post 290 145,000 16,800 1 " t { 12m post 195 175,000 20,800 1• .` \ V- ff, NOTES: -- 1.Seaward Extent determined from channel inlet seaward to-4 feet NAVD. 42.Area determined from Mean High Water to-4 feet NAVD. c I I , 3.Volume determined between surveyed bathymetry and Nov 2013 sall M a r20141 al shoreline If no inlet present. Ebb Shoal design criteria and Post-2013 dredging figures provided by Humiston&Moore) Typical Cross Sections for Dredging Typical cross sections for the suggested dredge template are provided below. Typical cross sections are shown for bay areas in Sections B and C where the bay is wider than the target cross section. In areas where the bay is limited by mangroves,the width of the cut will limited to maintain a minimum of a five-foot buffer to the mangroves. 2013 Target Proposed �;�. Dredged Area Design Area area Below 312 300 300 f { • MHW 1 6 SECTION A-TYPICAL _cc,c+.-_y.0• 0 4 cxwnc.•nos `- NNW(.a..13') u • _.... .._ _ -. _ it 1-4 021212112.N(422.1.424) AA -6 — It i' I.3 121.211."C1.4.0,c(-e,I. .kO) ., Te -10 NORTH SOUTH -12 -200 -150 -100 - ' • 50 1•• 1 • 200 DISTANCE FRtNI CENTER(FEET) Typical maintenance dredging cross section–Inlet Channel–Section A figure provided by Humiston&Moore) 89 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 2013 Target Proposed Dredged Area Design Area area Be low 650 450 450 MHW SECTION 8-TYPICAL s ' v 2_ (.aar} Go t \\-1 -2.. �nooaeti MONo fi G _Wim("at 14, -e- NORTH t SOUTH -12 200 -1150 -1700 -50 0 50 100 150 200 DISTANCE FROM CENTER(FEET) Typical maintenance dredging cross section—Seaward Flood Shoal—Section B(figure provided by Humiston &Moore) 2013 Target Proposed Dredged Area Design '`10"` Area area 7�`. A Below 530 450 450 10.MHW L SECTION C-TYPICAL 6- i 2. F. .uxx(.9.57'1 -p- s OAK 1K•w c(-e.n•xm7 -8- -10- . a--10-. NORM SOVfN -12200 -1'20 -100 -40 6 • do 16O Ido 200 INSTANCE FROM CENTER(PEET) Typical maintenance dredging cross section—Bayside Flood Shoal—Section C(figure provided by Humiston&Moore) 90 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Clam Bay NRPA 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 modifications that are found to be viable,pertinent and economically feasible alternatives or additions allowed under the scope of this Management Plan will be added to the Management Plan. Those changes in Management activities or new work items that are outside of the scope of the Management Plan but are considered important or practicable by the Pelican Bay Services Division and its consultants will be submitted to the FDEP and The USACE for consideration and inclusion into this Management Plan. 91 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Clam Pass Management Plan Stakeholders Groups and Review Agencies Review Agencies City of Naples Collier County Natural Resources Michael R. Bauer, J.D., Ph.D. Bill Lorenz 295 Riverside Circle 2800 N Horseshoe Dr Naples,FL 34102 Naples, FL 34104 Collier County Parks and Recreation Florida Dept. of Environmental Protection Maura Kraus/Barry Williams Megan Mills 15000 Livingston Rd P.O. Box 2549 Naples, FL 34109 Fort Myers, FL 33902 Florida Fish&Wildlife Conservation Comm. Florida Fish&Wildlife Conservation Comm. Habitat& Species Conservation Div. Boating &Waterways Section 3829 Tenoroc Mine Rd 620 South Meridian St Lakeland, FL 33805 Tallahassee, FL 32399 National Marine Fisheries Service South Florida Water Management District 263 13th Avenue S Laura Layman St. Petersburg, FL 33701 2301 McGregor Blvd Fort Myers, FL 33901 U.S. Army Corps of Engineers U.S. Fish and Wildlife Service Tunis McElwain 1339 20th Street 1520 royal Palm Square Blvd, Ste 10 Vero beach, FL 32960 Fort Myers, FL 33919 Stakeholder Groups/Individuals Collier County Audubon Conservancy of Southwest Florida Brad Cornell Andrew McElwaine/Kathy Worley 1020 8th Avenue S, Ste 2 1450 Merrihue Dr Naples,FL 34102 Naples, FL 34102 Mangrove Action Group Naples Cay Association Ted Raia Brett Cohan/Edwin G. Saphar, Jr. P.O. Box 770404 40 Seagate Dr, Ste 1206 Naples,FL 34107 Naples, FL 34103 Paradise Coast Paddlers Club Pelican Bay Foundation Jay Rose James Hoppensteadt/ Suzanne Minadeo 2392 Clipper Way 6251 Pelican Bay Blvd Naples,FL 34104 Naples, FL 34108 Pelican Bay Property Owners Association Seagate Property Owners Association Bill Klauber/Ted Raia/Joanne Smith David Buser/Sarah Wu 801 Laurel Oak Dr, Ste 600 P.O. Box 3093 Naples, FL 34108 Naples, FL 34106-3093 Sierra Club Southwest Florida Paddling Club 92 CLAM BAY NRPA MANAGEMENT PLAN(DRAFT) Pelican Bay Services Division May 1, 2014 Ver. 5.0 Marcia Cravens 20991 S Tamiami Trail 6075 Pelican Bay Blvd, #703 Estero, FL 33928-2838 Naples, FL 34108 Tall Tales Bait and Tackle The Ritz-Carlton Naples 841 Vanderbilt Beach Rd 280 Vanderbilt Beach Rd Naples,FL 34108 Naples, FL 34108 The Seasons at Naples Cay Condo. Assoc. Waldorf Astoria Naples Keith Tompkins/George E Bergeron Hunter Hansen/Donna Cox 81 Seagate Dr,#3000 475 Seagate Dr, Naples, FL 34103 Naples, FL 34103 Diane Solomon Brown& Stuart Brown Sandra J Doyle dianesolomonbrown@me.com naplespatriots@comcast.net Anne Georger Brandon Lampe ageorgerl@gmail.com brandonlampe@rocketmail.com Diane Lustig &Leon Lustig Linda Roth lustigl@embargmail.com LOR3LOR3@aol.com Missy Travis &Pat Travis missy.travis@gmail.com ptravis@delotte.com 93 APPENDIX 1 WAVE AND WIND DATA 2 Lu W W m „ K W co co Z e a) to ol co 4410,0„ ,, a, \ \ ...,,, ,,.. .- -,\ \ E vwi ,. X .^ , o ami 17 ��1-L\ kI ; Zco N O 1 m / I 0 ` � �y N ## 3i N 0.7 vri O CC W W O y= W 0 I OZ 0 v 11 f i',,4 v) Z. 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Within the black mangrove dominated basin forest west of Upper Clam Bay, 16% of the black mangrove trees were reported as dead and others as severely stressed; evidenced by a high incidence of dead limbs on trees of all sizes (Tropical Biolndustries and Gee and Jenson, 1978). 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 inspect Clam Pass Park by Mary Ellen Hawkins,then a Collier County representative to the legislature (letter to Don Duden dated April 3, 1989). Mr. Crewz concluded that the "dead and stressed mangroves were caused by lack of adequate water circulation resulting from the closure of Clam Pass.... allowing toxin and salt buildup." Westinghouse Communities, 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 (Yarboro 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 of Southwest Florida, 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, et. al. 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 combined with an admittedly impaired circulation system, encroaching development of the Strand community to the west, and intermittent pass closure, resulted in water levels that were high enough for a long enough period of time to adversely impact the mangroves(CBRMP 1998). Page 1 of 14 The Clam Bay Restoration and Management Plan was finalized in 1998 to address the mangrove die-off. 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. This was accomplished through the dredging of Clam Pass and portions of the interior channels within the system, as well as construction of a network of hand- dug flushing channels throughout the original die-off area and a few other areas that were exhibiting stress. 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). Summary of annual monitoring since the implementation of the CBRMP Provided below is a brief, annual summary of the overall health of the Clam Bay mangrove system. This recent history of the mangrove management spans from 1999 to 2013. These summaries include key events, such as major weather occurrences, flushing channel construction and maintenance, as well as documentation of areas of improvement and calculations of die-off acreages. 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. 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. .:..ti's* ' 14 • ��(�) Al p7A'. ,y "V i: 1' i ? k r' ,1 ';;': The main die-off area(NW Clam Bay, adjacent to The Strand) 1999 Page 2 of 14 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. Work planned for 2001 included the experimental Riley encasement method for mangrove propagules. 4 r• . Main die-off area 2000 ,.. . . } `1, �, ' c ' .'i1,„' • �i*' ' � ;�� �45 'Air " �', '', 4 tidi,\�j� * S..\' 5 , . t t"♦ 2 y.. s l \\'• o 4 - J* ,.. /,\.44..,-....-",..._7:.144 j 1 11 ii 1 4' , , , ' ' , : � \, • i?� .-r iii h 0 rr I'$, .-• .,:',• • •—,-1, I .,. . ,, ' Iy 1 A41' , Z tom. trl ,i� i •5�' { }tie tt de 0 it•CC S.•:,S''.'r 5•r 1"', C tv ir_�., f� Y, 4t ., S ,';'44,1, 1ft. }fix .( �tj7-_.. 0 .4t (,'d R�[{{f0.!?y/�� il, 1,462 I r S"jam Ai ,' `� "'�1)3 t•'C1.jr �� c k r.. tili} l�'Ar IL�'tc�Jfi�l��'rl'?'.' 5 .Yi .. ��' .� WV Riley encasements and flushing cut Page 3 of 14 2001 Mappingof 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 7is thought to have contributed to the recovery process underway, illustrated by extensive Batis and dramatic seedling recruitment. The observations generated sufficient concern amongst project managers in 2001 that a suggestion for additional flushing channel construction in the die off area was made. ! -44 • Main die-off area 2001 Page 4 of 14 2002 Additional flushing channels were constructed in the die-off area during late 2001 and results from the 2002 surveys show that these efforts appeared to have been 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. 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. eiaktir ;c m' T 1f '�f "...`On"tr , It ! • , Main die-off area 2002 with notable re-growth Page 5 of 14 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. r , 4. .,-• - `"."4' rt v' y It..,, ,.e r , `fors • x_' a — • fp..#�" r . w r` ., »V • Main die-off area 2003 Page 6 of 14 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. 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. 4 _. , _ . ; ......,,,. _, ,,..,e_...„4„....„...,,..„,,,, , ... . ,.1t44. t ,,,.."I‘Z-1.,:-,./' '.j?7-,F14‘4.4,4:,T.', - lb. cr .-!)tr5' f� E "'3 tea,� "�- , i4 yq 3• 3, ,, ..?„,::::k.l',0,t(tA,,,E.tit,- • . , ,4,-,-...• Ste. it t x t r v V + 'c' Vl 1 _,•)!71't i � ..`?"44'V ''# ' at� ; � ,.a • S:it -fit..,..04. , ,t.s! . - -' w • .i, '� •'.4141.;A.!-''. .1k Si a 1'� : �} ..F ` Yr T' 9r.�y� of 42;0'': )'' �' }-..),;,111*;-, K , ,*� ,�1 ,4' ,_• 'j 'fie 1 y E t, • w_ 4. 1•14, ,,t,. .....,...,_.,-.�.,$'h.t1'r!b r- 1h4'1r ,_ .. r S='' Main die-off area 2004 Page 7 of 14 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. In total, approximately 13 miles worth of had-dug channels has been installed since 1999. r a a. .wt 1 - .. $• n a 1t ISPI 1 p.... , Main die-off area 2005 Page 8 of 14 2006 Stress damage from the 2005 hurricane season necessitated the need fora 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 n 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. ta;. a g ' R Main die-off area 2006 Page 9 of 14 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 area 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. � n 1 f 2 . ' At* L si ,r. f r ' 4,'F f ;, z are. Main die-off area 2007 Page 10 of 14 2008 The 2008 monitoring report was the final report associated with the original 1998 restoration permits. Effects of the storms form 2005 still added a level of difficulty to the classification of areas within the system. While the defoliation associated with the storms had mostly recovered, falling debris affected several of the monitoring plots throughout the system. Approximately 35.4 acres of forest area have been removed from the die-off classification since the implementation of the project. Stressed areas of concern that may still be related to storm damage total or may be due to other factors (such as ponding or drying) add up to about 7.1 acres. Areas throughout the system that have not yet fully recovered but that have flushing channels and have shown marked increases in mangrove recruitment and new growth have been removed from this category(approx. 20 acres). A total of 7.3 acres of mangroves are still considered dead. This includes three main areas, the initial die-off area east of the strand where there are about 5.5 acres still dead, the damage from a tornado in the extreme north of the system accounts for about 0.8 acres, and the Hurricane Charley damage that resulted in a tidal restriction just south of the Pass accounts for about 0.75 acres. Several lightening strikes and small discrete die- offs spread throughout the estuary make up the remainder of the die-off acreage. 7, as,.. „r .,,'7: •77,,WA*444‘41;17*F44354W;t7;° :*"1:::Ak:011.1.;;:".?; '#.1',.V''''-* ? ' ' ''..,.- , . .'4. . .; '_ 2 t '� ,' f.�'f.i,.! y'y . ,14,41-Na e `� d # ?4 t h } S yw 3 S .t„ .. c. x �i ett r. s ..i.xi' s a^ Sd 1: Fp^ ,..?';1:•44X.;44,-;;f4''' T Ei Y j + East of the Strand Die-off area, 2008 Page 11 of 14 2010 Even though the permit requirement for monitoring reports ended with the expiration of the 1998 permits, the PBSD continued to monitor the mangrove health within Clam Bay and document the positive results within the mangrove forest. Exotic eradication activities were also continued to allow for natural regeneration of mangroves observed elsewhere in the system. Construction of the last component of the flushing channels was completed in the 2005- 06 season. Inspection of these flushing cuts this year showed that they are still operating as designed and are contributing to the continued growth of new mangroves within the system. Stress in mangrove forest areas is still apparent, although in several areas this may still be attributable to storm damage or to frost damage brought about by a couple of very cold temperature nights. The spectacular recruitment of white mangrove seedlings, now 8 to 10 feet tall saplings, throughout the original die-off area is testament to the efforts undertaken with the initial dredging and that work can be considered a success. rc T" • . Main die-off area 2010 Page 12 of 14 2011 -2012 An infestation of boring beetles was discovered in the early months of 2011. Observations within the system and research into the life habits of many boring beetles led to the conclusion that white mangroves stressed by the sustained cold temperatures in December 2010 and January 2011 were most susceptible to the beetle attack. Cold stress reduced the abilities of these trees to fight off the boring activities and many trees succumbed to them. Yellowing leaves, leaf drop, and eventual death of the tree was the result. The dead trees were easily visible in the rooftop photos taken periodically from the Grosvenor and Montenero condominiums. Efforts to hatch beetle larva led to the identification of at least two species, a round-headed (Longhorned beetles) and a flat-headed borer (Metallic beetles). No further loss of trees was documented after 2012 as a result of the borers. ' :'.%.,... Fs,'- 3.T'i T<Y. �uft`x .FY. FY'y-713t ilftr-- ...^• .7i 340,14, .., i ,,, . „.., , ..,.. ,,.....,,,4 i',. - 'g' ..- ' a4 >• �_ �t •� -12 4. {�tydPyd� s�TJ4 .�4 ' uR '. `: taY • 1 .---14.-, T. LMY+ r, 1!{, t-. kti � {i. . Mppp,''' `71".4.4.. µ� sh4 , jC �' ✓ cq i rifirt L „sv; sf A. a\ : 15 - hite Mangroves affected by cold and borers W 4 ,'8:'1.1,.', 1., f ! : ilift #” a rt Borer damage to stressed tree Page 13 of 14 ,01 2013 The lack of harsh weather occurrences, hurricanes or freezing temperatures over the past year seems to have allowed the areas impacted by the boring beetles to begin to recover. A total of 4.02 acres of mangroves are still considered dead or stressed, a significant reduction from the original die-off of over 50 acres in the late 1990's. Typical flushing channel maintenance was conducted to ensure that the channels were operating as designed and continue contributing to the growth of new mangroves within the system. sa X "V `ar. is s� P r 4,4 a e fa � �y 15 • ' ✓- p yT 379 tf • Main die-off area 2013 Page 14 of 14 APPENDIX 3 RECENT HISTORY OF SEAGRASS PRESENCE IN CLAM BAY Appendix 3 Recent History of Seagrass presence in Clam Bay Reports of field surveys from the early to mid 1970's document the presence of seagrasses within the Clam Bay NRPA but do not give any estimation of coverage or densities within the system. It is noted that seagrasses are present only in Outer Clam Bay, and there is some hypothesizing that the lack of seagrasses in Inner and Upper Clam Bays is the result of lower salinity levels and lack of water exchange with the Gulf. (Heald, 1972,Tropical Biolndustries and Gee and Jenson, 1978). The Collier County Department of Natural Resources produced an analysis of the seagrasses and benthic infauna in Clam Bay in 1987. In this report it is stated that a 15m x 15m plot encompassed most of the grass beds in Clam Bay. The report exhibits show the plot location on the east side of the waterway between the Pass and Outer Clam Bay,much in the same location of seagrass beds which exist today. A DNR memorandum produced by David Crews in 1989 also mentions "some seagrass and algal beds" being present in Outer Clam Bay but again offers no information on location, aerial extent, or densities. The 1991 Collier County Seagrass Protection Plan states that "Outer Clam Bay contains one of the densest and most extensive seagrass beds in Collier County," though it does not quantify aerial extent or density within the report. An exhibit associated with the report shows the entirety of Outer Clam Bay from the Pass to the Seagate culverts as seagrasses(almost 60 acres). A 1994 report documenting conditions in the proposed Clam Bay Natural Resources Protection Area by the Collier County Environmental Services Division documented that seagrass coverage in Outer Clam Bay was approximately 10 acres. Based on anecdotal information and on comparisons with other seagrass areas in the County during the same time frame, it is not presumed probable that there was an 80% decline in seagrass coverage during those two years but instead the 1992 report may have over-estimated the coverage. In 2007, PBS&J conducted a seagrass assessment in Outer Clam Bay for the Collier County Coastal Zone Management Department. Of the 30 randomly selected sampling sites observed, seagrasses were found in 13 of them. No conversion to an acreage estimate was made in this report. At the locations where seagrasses were observed,the estimated density relative to bottom coverage was between 5 and 25 percent. Page 1 of 7 Annual Estimates of Seagrass Coverage since implementation of CBRMP The following annual summaries provide general observations of the presence of seagrasses within Outer Clam Bay since the implementation of the Clam Bay Restoration and Management Plan. S L ! � a CK atL1 \-4.',..-..‘"t• 1,1 , r 4. ; '.:_,T; i. q-,:. tif„,,- ,,, ----s.,,,,,,,,v- ., .,tHIL--i 1,4,::-. -‘, :, . . 1...:,,,14 :' ,6...-viic:. '� ` : '� t.: y `�' fi,, 4Cr.' + y1 nom-i ci€4,..,...... ` 'J uT l ^ J. ha •. l,.t .� �• •.: P�_.t... S6F!1M s_ L-R�.�Jv fi �l.�� 1'�I(..Y�' Approximation of 1994 Seagrass Coverage Page 2of7 1999 Prior to the initial dredging associated with the 1998 restoration and Management Plan, seagrass acreage is estimated at 5.13 acres, restricted to Outer Clam Bay and the channel leading to Clam Pass. SEAGRASSES APPROX S.1"„, ,.,,.....„ . ,apic . , . ,: ' tie.,, 4. , ..,...,... „.....„„,..,,,:. ,„n „.....,!„..,„.....„,.,.., t , ., ,,,, ..,:. s . „,. ,....,,,,..,,,,....„... :,,,.,„ ,, , , ...., ,,,,, .,, , ,,,c,",...i+y x y ti$ 'a 4 7� k .Iz i. s _ +. i --..-jz; '0111:' v.,-,' ..„,, , , ,:, - , - - .,,,-, ,4...,__ ..__...../".-' —--------.----''''''A ::-:- • — gd, io i. - ,...i,'...,-, ' 1 ,r .... , ,,,,, , iii05 '•':Li. 1S i , E x °'t t f-a.l�-i i moi ; f. A4-1_,25.:,,�•e -4. i* 1999 Seagrass Coverage 2000-2004 Seagrasses show a slow decline during this time frame. Water quality testing within the system does not indicate chronic degradation. The decline is attributed to the increased tidal range caused by the dredging work, which results in longer exposure at low tides of the shallow areas where seagrasses were present. The one-way culverts installed at Seagate, thought to have reduced tidal exchange in Outer Clam Bay, were removed in October 2002 to determine whether tidal exchange between Venetian Lagoon and Outer Clam Bay could be achieved without affecting Clam Pass. Seagrass bed in southernmost portion of Outer Clam Bay begins to expand in 2003 after removal of flap gates. Page 3 of 7 2005 An increase in the seagrass coverage within the channel transects was documented. Increased density of the beds within the bay area east of Clam Pass is also noted. 2006 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 improvement since 2004 seems to have continued into 2006. Approximately 3.6 acres of seagrasses are noted along the transects. SEAGRASSES APPROX.3.62 AC. ,, as e `ti 4 ti'.,',..., l L 7�t0 .�:eft iv � t ny�ca+457 � . _ r @•' __° s A w1//.0 S' r qy `��� Fe, � ! ,l�,{{p J \ y�_ F !s.;� +'� �! 1 t�A"IIF .�'1 .."'" •.t: . ':',4-. 4.-7. -4 .1.,:., i‘.-._, .,-,Ii ri..... 2 'I: -A 'wrc -07,,.- f 4%, S ��cl *rte •-',..,''y {Ai—VI sr+ "1 \'f'-i f.. . t .,. aX ,a * f Zak +Z �Kt>..tp ''Vl f y�n. l �-r�� 2006 Seagrass Coverage Page 4 of 7 2007 Concerns related to the seagrass coverage within the bay were raised by adjacent property owners this year, and Collier County contracted an additional study by Post, Buckley, Schuh, & Jernigan Inc. (PBS&J) to investigate seagrasses and nutrient inputs within not only the Clam Bay System but also Venetian Bay, Moorings Bay and the entire Doctors Pass area. Some of the results of the PBS&J study relevant to the Clam Bay System were; • That seagrasses were present within Outer Clam Bay. Paddle Grass (Halophila engelmannii) was observed at 13 of the 30 randomly generated points within Outer Clam Bay. • That residents' concerns that seagrass coverage had declined from 60+ acres to present were unfounded as early estimates of 60+acres were likely erroneous. • That nutrient and chlorophyll-a levels within Outer Clam Bay had increased over the past 20 years but were still below median values for Florida estuaries. Also as a result of these increased concerns regarding seagrasses, Turrell, Hall & Associates expanded the annual seagrass survey to cover the entire bay and not just the defined transects. Additional seagrass beds and macroalgae were observed in areas where they had not previously been documented. Though all of THA observations were of shoal grass, it was noted that all of the PBS&J observations were of paddle grass. It has been observed in the past that paddle grass is very ephemeral in this system and it is likely that the 2 months between the PBS&J and the THA surveys was enough time for the paddle grass to disappear. 2008 This was the final monitoring event of the seagrasses associated with the 1998 Restoration and Management Plan permits. Increases in seagrass coverage that were noted in 2007 continued through this year. A small area of paddle grass was observed along Transect #2 which had been devoid of grasses in the past. Other transect areas that have been devoid of grasses until this year include the western shoreline of the channel between Clam Pass and Outer Clam Bay (Transect 5). Seagrasses had been present along this area prior to the dredging but were replaced by black mangrove propagules when the increased tidal range led to extended drying times of the shoals where the grasses had been located. New grasses this year have been observed along the edges of the channel in areas that do not dry out so much during low tides. In addition to the seagrasses, other observation made along transects indicate that the biological diversity of the macro-invertebrate fauna within the system has increased. Page 5 of 7 Several mollusk species, including Florida horse conchs, southern hard clams, stiff pen shells, tulip snails, cockles, oysters, and several others were all observed. 2012 Seagrass coverage within Outer Clam Bay has continued to increase. The initial decline noted immediately following the initial (1999) dredging activities appears to have been reversed over the past 8 years. The decrease stabilized around 2004 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. Approximately 4.27 acres of seagrasses were noted within the system this year. Most of the seagrass observed was shoal grass though small patches of paddle grass and turtle grass were also observed. Future monitoring of the seagrasses will be conducted to see if this trend continues. SEAGRASSES APPROX.4.27 AC. Ya }.`;y .:iu. L f. ,:-- ma�ya,, _ , tia itJ l'ilti 4" Y Y, I 1 , ' t _ _ ',;' .p 44.1 yy '+ �I ..4, .tel y l : t •�S k C, :" ' ,o ,fir + V1 s a•'*��; 1 . ,ate.`? .+ 4 + ' .,.` r. "kyr :L. 2012 Seagrass Coverage Page 6 of 7 1 2013 Seagrass coverage overall totaled approximately 2.85 acres along the monitored transects within the Clam Bay system. What has been shown by the past thirteen 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. 4 ,e *�4 ,, t S ti slet 7 w : . i - ..''d 4,7 '4'" &...-IVO . ra s` > ti t- -JAI, A.0 `jOtr e S! � ,. 144,141� t 2013 Seagrass Coverage Page 7 of 7 EXHIBITS - 11.11111111 n I L J40 1 3 yr ;' rx 1-r ra ridk.Ji Igtt' Ca- i A' ..x- i �SA. arc E c 44.4.1 1 NM aQ f7 eu.._s...'' 3 c t r i �1Y; 1y �t�;i � }i t r-'L � yt� ea n F __ a 1� S�'r `+,xge ltp w 7 '{s'tet`� �Itr my 7°- z .'� �t�ae�'s'31� - r'�`�"Z 6 e4"� 1 4tgw t. -, . Z ij.,-,tt,-,.:,....... - 4.4,,,,,,,-- - ....4ki. -- r:,...., i I� - '4.a > 0 0 0. W W ,a m p _ t7� U� ^ Q ` W W 4. 0 CO(oO Q 6 a \\�/fx V 7 y w 6i. O o w Q n/ a U 2 0 ,a- 0 0 .J LL >- U . z 0Ai . 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A r� ?Aditio MAHOGANY OR i �Sf<,71�! ,(i �1" t U '1St t Al '', p i '''*.' # t 1�', ++LVID t j� I` .. 4,,.....„.„, 1 ...: - .:,-;_,'._•-• '''LI;p...••:-.,, .:41,.. . 1F '2 's Pt-...0--k t y 1 �Y <p r >> a yE s t _ SEAGATE OR. • I' ..: ' an 1Y1Y^Z.:A`,TT r.. it _m _ a ,aY � 1�,��,�4 � fig- " 4,.i'.✓ _ )1 ig�. -., ,•� m f c Sr �e d {� ;id e,�,;; „ r. ."°"i�A' L;r)i`�tK `�f _ Z WHISPERINGEiNE LN. YL. 4/410-,.,,,,-4,',�_J/,:a l II ' ,,,,„,4....r„..1-,.. t 1 w fid `, SFLf+ATF. q 4 E lj �, `.,. 1952 AERIAL „t :' ` - r 4 fir.; la # V': • of t7 3 4/1_",r 5 ' c aiT .k r > at i. S. < r It c. ,,t-...`.. ¢7{ N O.w fim ,,, ”` 0.t r a tip' 1, t e '`' r , X1,0 is, Via INIF Y► C R j, _ _� 'A '.it 1 Z4,:,,,,, 1 1 7J . ,� � _ t ' D '� ,.-2.,-,.-,,:,4: _ O +. 1i i • 1 L 5 ",fa" Z 1 ; �, •e�¢, , 1 , D s7j ' ' { N -% 4s V.; ,:`': , ,. X. ik Ilk' $ 41 o•,� I an rspy te.. . �' y. vi ,-e?,,, e jY >a'n .., .1.7',;"-","' 0-'1-71./.!! 11 '.:'>i:.1 ]ia ',Q. q o s C 00+0— 0 s{... 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Collier County Natural Resources Department. Clam Bay Natural Resources Protection Area Management Plan Draft,technical paper-4th rev.Nov 21, 1994. 2. Collier County. Executive Summary—Approval of Clam Bay Natural Resources Protection Area(NRPA). 21 Feb 1995. 3. Crewz, David W., 1989, Clam Pass Park mangrove damage, Department of Natural Resources Interoffice Memorandum. 4. Crewz,David W. Florida. Department of Natural Resources. Clam Pass Mangrove Damage. Interoffice Memo,May 1989. 5. Gee &Jensen Engineers,Architects and Planners, Inc., 1978,Hydrographic Study Clam Bay System Collier County,Florida for Coral Ridge-Collier Properties Inc., report. 6. 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. 7. Hawkins, Mary Ellen, Obley,Ross P., "Pelican Bay-Visit and Revisit."Urban Land Vol. 40, No 11. (December 1981)21-27. 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. Heald, Eric J.,Roessler, Martin A.,December 1979, Invertebrate Population Studies in the Vicinity of Upper Clam Bay, Collier County, Florida, Tropical Biolndustries, technical paper. 10. Heald, Eric J., July 1983, Populations of Melampus coffeus and Cerithidea scalariformis West of Upper Clam Bay, Collier County, Florida,Tropical Biolndustries, Inc.,technical paper. 11. Heald,Eric J., July 1983, Fish Populations of Tidal Ponds West of Upper Clam Bay Collier County, Florida,Tropical BioIndustries,technical report. 12. Humiston and Moore Engineers. 2007. Clam Pass Restoration and Management Plan Bathymetric Monitoring Report No. 8. 13. Humiston and Moore Engineers. 2010. Clam Pass Restoration and Management Plan Bathymetric Monitoring Report No. 12. 5 14. Humm,H.J. and Rehm,A.E. 1972. Ecological Appraisal an Ecological Study of the Clam Pass Complex. Study for the Collier Company at Clam Pass Properties. Tri-County Engineering, Inc. TCE Project No. 1516. 15. Lewis,Roy R., and Marshall,Michael J. Lewis Environmental Services. First Annual Report, #2; One year after flushing channel construction. 1997. 16. Natural Resources Conservation Service. United States Department of Agriculture. Soil Survey of Collier County Area, Florida. 1998. 17. Tackney&Associates, Inc.,Preliminary Hydrographic Assessment Clam Bay Systems. August 1996. 18. Tri-County Engineering,Inc., 1971, Tidal Datum Plane Determination for the Collier Company. 19. Tri-County Engineering, Inc., Sarkar, Chiranjib K. Hydrographic Investigation of the Clam Bay System, Technical paper. October 1972. 20. Tropical Biolndustries and Missimer and Associates, Inc.,A Comparative Study of the Water and Carbon Flows of Upper Clam Bay,technical paper. June 1979. 21. Turrell &Associates, Inc. Environmental Assessment Northwest Fill Area for Pelican Bay, technical paper. February 1979. 22. Turrell and Associates, Inc. and Humiston&Moore. "Clam Pass Inlet Management Plan Interim Report No. 1". July 1995. 23. Turrell, Hall &Associates, Inc. 2009. Clam Bay Restoration and Management. Biological Monitoring Report. Eighth Annual Report No. 11. 24. Wilson, Miller, Barton&Peek, Inc. Pelican Bay Mangrove Investigation, Pelican Bay Water Management System-Stormwater Detention Volume and Water Budget Analyses. April 1996. 25. Worley,Kathy and Jeffrey R. Schmid. "Clam Bay Natural Resource Protection Area(NRPA) Benthic Habitat Assessment-Report for the Contract Agreement Between Pelican Bay Property Owners Association(PBPOA), Pelican Bay Foundation, Inc. (PBF), and the Mangrove Action Group (MAG), and the Conservancy of Southwest Florida(CSWF). Dec 2010. 6 Clam Pass Maintenance Dredging Design Criteria Draft Report May 2014 Prepared by Humiston & Moore Engineers Contents Background 1 Governing factors for Inlet Channel Stability 2 Bay Tide Range 4 Physical monitoring data analysis 4 Section A Inlet Channel 8 Section B Flood Shoal 8 Section C Outer Flood Shoal 14 Inlet Channel Length 23 Ebb shoal 23 Summary and Recommendations 28 Background This report provides an overview of the governing factors to establish design criteria for future maintenance dredging for Clam Pass. These factors are based on the physical nature of Clam Pass and monitoring data of the inlet evolution. Clam Pass is a small wave dominated inlet on the southwest coast of Florida that provides a tidal connection to 570 acres of nature preserve including 420 acres of mangroves. The relatively small tidal prism of Clam Bay provides a critical balance between tidal flow in and out of the inlet channel and littoral processes moving to the inlet. This affects the inlet hydraulic efficiency over time, especially when littoral transport rates are high due to periods of high wave energy. During the 1990's, Clam Pass was subject to channel migration as well as closure, and frequent dredging was necessary to keep the inlet open. In 1999 Collier County, in cooperation with the community of Pelican Bay, which borders Clam Bay, implemented The Clam Bay Restoration and Management Plan. The purpose of the plan was to provide more sustainable tidal flushing of the wetland preserve by keeping Clam Pass open longer. The plan included dredging the inlet channel and parts of the flood shoals which had accumulated sand over many years.Those interior shoals,when present, reduce the tidal prism by obstructing tidal flow to bay areas beyond the immediate vicinity of the inlet. The implementation of The Clam Bay Restoration and Management Plan resulted in significant increase of the tidal prism relative to conditions prior to the 1999 dredging. The plan also included monitoring and maintenance dredging which occurred at approximately 4 year intervals. As a result, the inlet remained open for 12 years, and the areas of stressed or dying mangroves recovered. Clam Pass requires maintenance dredging to remain an open and viable inlet and bay system. Following the 1999 dredging, maintenance dredging occurred in 2002, 2007 and 2013. The most recent maintenance dredging in 2013 took place following inlet closure in late 2012. Following the passage of Tropical Storms Debbie and Isaac and high energy wind and wave conditions during 2012, the inlet shoaled rapidly, resulting in inlet closure in September of 2012. The County obtained a state permit for the continued maintenance dredging of the inlet. Subsequently, the County, through the Pelican Bay Services Division (PBSD), obtained a federal permit to reopen the inlet, following the same channel template that had been permitted since 1999.The complete closure of the inlet in late 2012 resulted in the collapse of its ebb shoal onto the beach and a relatively large volume of sand was pushed onshore by waves.The inlet reopening was completed in April 2013 and tidal exchange between the bay and the Gulf of Mexico was restored to near design levels. Governing factors for Inlet Channel Stability The inlet channel is one part of a larger tidal inlet system where the inlet connects the bay system to the Gulf of Mexico. The tidal flow through flood and ebb tides interacts with active beach wave and sediment transport processes that influence the stability of a tidal inlet. The morphologic features of a tidal inlet include ebb shoal, flood shoal and inlet channel. Figure 1 illustrates these three features.The flood shoal includes the sand shoals on the bay side of the inlet channel.The flood shoal is less dynamic than the gulf side of the inlet as it is influenced mainly by tidal flow and sheltered from the varying wave conditions on the open coast side.The ebb shoal features can be explained as sand bar features forming a delta on the open coast side of the inlet.The ebb shoal delta shields the inlet channel from waves and provides pathways for sand transport along the coast to bypass the channel without shoaling the inlet closed. A stable inlet system requires an ebb shoal feature that prevents rapid shoaling at the inlet mouth. The inlet channel maintains its flow cross section through tidal flow that scours the channel to required flow area while the waves are moving large amounts of sand along coast. The stability and dynamics of a tidal inlet is based on the balance of the two forces of tidal flow versus wave induced current and sand transport. The direction of wave action plays a significant role in the shape and dynamics of the inlet features. Clam Pass is critically stable but subject to shoaling and therefore requires regular monitoring to determine when dredging is required to prevent inlet closure.The relatively small bay area compared to other estuaries in southwest Florida provides adequate tidal flow to keep the inlet open under typical conditions. The narrow nature of the flood shoal area, surrounded by mangrove forest limits the flood shoal capacity to maintain an equilibrium volume and bypass additional sand to the gulf and bay waters. The accumulation of sand over long periods of time, especially within the flood shoal and inlet channel creates additional resistance to flow. This additional resistance causes a reduction in the tidal range within the bay system and consequently reduces the flow through the inlet. Reduced flow through the inlet may be detrimental to the inlet remaining open. Maintenance dredging to restore the flow rates to stable magnitude is needed prior to reaching such shoaling conditions. The design criteria presented in this report aim to establish guidelines for the inlet stability to assist in determining the need for maintenance dredging. Design objectives also aim to minimize dredging to essential maintenance needed to maintain an open inlet and protect the valuable environmental resources by restoring flushing and to allow natural evolution of the inlet morphological features. The hydraulic and physical monitoring data of the Clam Bay system collected since 1998 to date were used to evaluate the governing parameters for the inlet hydraulic stability.The monitoring data for Clam Pass indicates that the dynamic nature of the inlet is consistent with that of a wave-dominant small tidal inlet where the inlet channel and ebb shoal morphologic features (sand bodies) may change shape following sustained wave and wind conditions. During the summer months, persistent winds and waves from the southwest cause the inlet channel and ebb shoal to migrate to the north. The fall and winter wave climate is predominately from the northwest direction, which pushes the inlet southward. The seasonal variation of wind/wave energy windows and the temporal cycle of the tides result in the shifting of the channel entrance and morphologic features around the inlet entrance. Recently collected monitoring data shows the inlet to be hydraulically stable, with an adequate flow cross section to maintain the inlet open.The data also show the dynamics of the inlet channel and ebb shoal features. 1 d z+ �k� 1 tfi i. jet fir '" x� a .;1. 1v�� 1 F t 3 Q 0 `p 9 O 4 .(;°+ 1 N ''''" '' -• .. , -' , . , Ni.:„";'..)Ari'.„1.'......",,, ,, .'" ,,,‘"•• ,''':''')`°.,,-', 1 - CU CU . ' ' - ..' - --?1,4-•'-',) -,-I) '''''''', '.';' .F., rts bo o ci O (13 U S qq3 ...... LL „F„- III i Bay Tide Range The existing hydraulic monitoring program provides water level measurements at several stations within the bay system.The hydraulic monitoring data provides a record of the tidal range in the bay which is an indicator to the tidal prism or volume of water flowing through the inlet at each tidal cycle. In this analysis a review of ratios of the bay tidal range to that of the gulf tide is used as the monitoring indictor to the flow through the inlet. Figure 2 shows a definition sketch illustrating the tidal ranges for the gulf and bay.The bay tidal range is typically smaller than that of the gulf tide due to flow resistance through the inlet channel and shoal features. The figure also shows the locations of two of the bay tidal gages that are used in this analysis to represent the bay tide range. Figure 3 shows a plot of the annual ratios of bay to gulf tide from 1998 to date. However, data collected in 2006 and 2007 were insufficient to provide an annual representation of the tidal range ratio. The figure indicates that when the inlet was hydraulically stable the ratio between the bay and gulf tide was between 0.6 and 0.7 over 90% of the time. The data also show that this ratio was below 0.5 prior to 1999 dredging when the inlet was unstable and in 2012 prior to the inlet closure. Dredging occurred in 2002 and 2007 while the tide range ratio was within the stable range. These dredging events were carried out as maintenance measures to ensure that the channel remained in a condition where closure was unlikely. The decision to dredge was based upon the shoaling conditions within the inlet. Monitoring reports from the time indicate that maintaining adequate flushing within the system was a significant concern. In both cases, approximately one-third of the 1999 dredge quantity had accumulated within the dredge template at the time of dredging. In both cases the dredged material was placed south of the inlet to alleviate local beach erosion. Physical monitoring data analysis In addition to the hydraulic monitoring program, analysis of the physical monitoring data is used to characterize the flow areas and shoaling within the channel and flood shoal areas. The physical monitoring data includes bathymetric surveys of the inlet channel, flood shoal and ebb shoal features. The data analysis includes evaluation of the flow cross-section areas in three main sections of the dredging template, Sections A, B and C. Figure 4 shows the dredge template and the three monitoring segments. Section A represents the inlet channel, Section B represents the seaward part of the flood shoal and Section C represents the bay side part of the flood shoal. The analysis included evaluation of the cross section of flow below mean high water and volume of sand within each segment. The cross section of flow was computed at each survey station spaced approximately 50 feet apart. The average and minimum cross section areas were used as indicators of the physical condition of the flow area through each of the three segments.The cross section areas were compared to the design cross section area of 2013 dredging and the inlet conditions in 2004 and 2008. The 2008 and 2004 inlet conditions were used as a background benchmark for inlet conditions near equilibrium as the 2004 and 2008 survey were completed 2 years and 16 months following the 2002 and 2007 dredging event respectively. These conditions represent the inlet at stable conditions after the post dredging adjustment phase. '14. "tj aS� .l' q. ._.1.7-,7i 1� 1,:. z`` n t"r,,, a `s t,'-'7,4 c-1 j ' '.: ‘.'1':.1.-t s .. }.a ,r-, yT .jr• 1 F.'a^.Y y rs..,r _i"' ,cor ,, •' t yti / ;•,-,.. 0 0 ---/— \ CO 0 ', --- p £Z i r ' IW a) \ I".el 1 I co ttli W 103 cu an c 1 2 rd 1 I ) 1 co -O lZ in asiiiiit'l 1 \ a I d i U C N I I 0 ) 1 1 i I ' Z 1 • b0 1 1 I m I en I r. I 44— RI i )4\s\1 V P CD CU -I0 U fB N E inD d- O N _ bA —— '.. N N N 1, co • - c)cD 1 N o CD iCO . O bb I C O O -O m , -O .c , :3 — LU 0 O 0 O i I L } N 0 (0 ca cc o N — a� co o b0 i O C co N Occ 121) .� —t— 1 - N 1:3 To i D ro H 0O N as __ _ o o O N CO N E _ a) � o M rri 00 r i o 4J 15 — c a ) to -03 U LL L c i.: D Q) 1 LU (..) C rn 0') Dena 0 0 0 0 CD 0 0 0 0 CD -6 01 00 Ln ' 1" CO N 0 o +- 0 0 0 0 0 0 0 0 0 0 0 n o oi}eu ague a i aSe.ian ienuuvz Q �I a p.l d ' S- } :;t ttil .,f .1, ..,0:. i ` Wait - .4a--) E �i Aft bp w to ci i ' 4 0 Cvi Win co• 110 rof c 1111 ' gill et LL Y Section A Inlet Channel The indicators used in this analysis were average cross section area, minimum cross section area and total volume of sand within Section A. Figure 5 shows the change of average flow cross-section area below mean high water for Section A.The figure covers the time period from January 2013 (pre-dredging conditions) to April 2014 (12 months post-dredging). The figure shows the change in cross-section area from pre-dredging conditions when the inlet was closed and its evolution immediately following dredging to 4 months, 7 months, and 12 months post dredging. The figure also shows the benchmark reference areas for the 2004 and 2008 average cross sections and the 2013 design cross section area.The data indicate that following the inlet opening in 2013 the average cross section shoaled below the design area while the inlet morphologic features were forming. After the initial adjustments the cross section area increased to above the design area and 2008 conditions, but remained below the 2004 conditions. Figure 6 shows the change of the minimum flow cross section area below mean high water for Section A. The figure also shows the change in minimum cross section area from pre-dredging to 12 months post dredging with comparison to the 2004 and 2008 minimum cross sections and the 2013 design cross section area. The data indicate that following the inlet opening the minimum cross section shoaled then steadily increased. The minimum cross section area remained smaller than the design cross section area, but approaches the design cross section area after 12 months. Figure 7 shows the change in total volume of sand accumulated in the dredge template since inlet opening. The figure shows that the Section A dredge template has accumulated sand within the dredge cut. It should be noted that the channel migrates and meanders within in the vicinity of the dredge cut. Thus,this indicator should not be used as a measure of critical conditions of the channel. Figure 8 shows a table of the design criteria parameters for Section A with comparisons to post dredging measurements. Recommended target values for each parameter are shown in red. Section B Flood Shoal The cross section area of flow through the flood shoal in Section B is an important indicator of the flow exchange between the bay and inlet and the flow efficiency to maintain the tidal range within the bay. Figure 9 shows the change of average flow cross section area below mean high water for Section B since inlet reopening.The figure covers the time period from January 2013 (pre-dredging conditions when the inlet was closed) to 12 months post dredging in April 2014. The figure shows how the average cross section evolved immediately following dredging to 4 months, 7 months and 12 months post dredging. The figure also shows the benchmark reference cross section areas for the 2004 and 2008 conditions and the average design template dredged in 2013.The data indicate that following the inlet opening the average cross section shoaled below the design area while the inlet morphologic features were forming. This process has continued throughout the 12 months post dredging. The cross section area remained larger than 2004 and 2008 conditions during the first 6 months post dredging then shoaled significantly in the following 6 months. The 12 months post dredging data indicate that the average cross section area within Section B became smaller than both historical benchmark conditions of 2004 and 2008. 1-1 0 N C N O c ++ O Cr U N• v N O I • O N I U N v U v v OD ODCO no CO CO M I NN Q) a) I 1 r crl CO 0 cr oN I O I O 0 i CNI I @ I I Q I I I I C 0 O I IN N +.1 I • I NNI U G1 I 1 (/Y m 1 I 0 CO GJ o Q i I I ,--1 c QO I i U O v CD N O IIN o I • v ro co L- 4—O I Q I M CI IIN o O O . I `� + I N o U I 1° :Di0 1 V') I '-I N I - \ilim OII •U 1 i o I111° • a I M u. I I mc-I E, O M 1 1 N W) I IN c\-I I I • (N a--I O N I, O O O O O OO N O O O O O O Qp u) Cr M (I}bs)MHVU nnoia8 eaJly uo!pas ssoo d- 0 N c o N U 0 .71- a) VI 7' U U) N d' 0 L.O w 0 I IE - E E N U I I EE E m C i , n C C 2 0 2 2 .1- i -c-c c-n �m-1 CO 0 ON II o 0 0 0 - I l II Q 1 I I m I I 0 C I O - Ni N U r-+ G.) I V) m I I I o I - m Q CO I CD 0 0 o O i 1 I o +, a � I m a) _0 I - v\ p to co a� LL I I o\o Q CD 9 I I m O 0 LL- Q Ln O 4 I U I 1O0 U V) II m au N tn i _ 2 ON • - NI 2 Ln U 1 I = o N —,\ 1 I i o = I I Ntto i NI 1 I i3 N O N N. O O O O O O I O OO N Ln t-i .71- .71- m O N NO O (4 bs)MHIN moue said uoggas sso.q cr 0 N c\-1 (N m 0 a 0 o 0 0 0 0 I • N N N dr • .--1 I 1 i I rg I m I I ct I I 0 N - I I m < • NI 0 - N GI 1 • .i I I o GJ I I o Q J) I _ C o 0 ...4-2,if t U W ...4-2,a) CO I • m N Q. I � o a; Cl.)CI al CD • !I C E I I- GJ I m a- - in v I N 0 CI I VD .-- C I co M r-I CU i I N (11 RI QD • 4- S •I 0 CD i , o I • m 1 O• 2 I I m f\ I I i I 1 r.1 110 0 I I VD LL N p I I N c-1 O N I,- 0 \O O O O O O OO N O O O O O O O O O O Opt O O O (AD)a;eidwal a2paio u!luatmpas ' M 4.1 �` O v D ' 're, O ,, z! -' . C © p O 0 0 a., I� M M 0 V 0 N N N v 0 0 N O O V O CU N N H _ 1 4. O O .CC_ ® 0 N in O O O O Q N (, C NI IN m A OM N N OM 0 0 U t F. C 3 CO 0 p C VO ++ N ,, ' i 0 a3 a p V Q U1 m n m M M d- a 2 p - ao CO '( v W o .n .i Ln +, 0 "' 0 0 °' GJ 0 � To 4_, bm ▪r.U o 0 0 co o E E Nir O N N N H- 0_ m to i b.0 •CU il 1 df 0 N c\-i Ni C dr O C :.1C 0 U 47, • N N Td- -I to 0 I . I 0 ,\ U I I c U o o m by c CUD bA I ! fb by (6 @ I < 0 < < 0 N \ I I 0 0 0 0 `-I N N N N c-I CO I I I ! ! m I I I 0 0 I I N 4.JNI • I I U • r' a I 6 V) m I ! .0 N c ! \ CU o m Q 1 I c-1 c 0 I 0 °' IP a, O I `�' o I LL. • I I co a �O I I Q M p IN LL }1 N O N I ! UD C 0 N) ! Itn I m of II _ NI o O Li u I N • 1 Ico otaa N CU - \ > \ M Oi M I0 as - \ LL I I NJ N c\-I I ! • N c-I O 1 I I I I I I \ ., O O O O O O O 0 \ O O O O O O O N ,,a7 r--- lD Ln .r e-1 (1.}bs)MHIAI mops eaiv uoppas ssoap Figure 10 shows the change of the minimum flow cross section area below mean high water for Section B since inlet opening. The data indicate that following inlet opening the minimum cross section shoaled to a level similar to the 2008 conditions.After the initial post dredging adjustment the minimum cross section area of flow, the 4 month and 7 month post dredging conditions became larger than the conditions of 2004 and 2008. However, at 12 months post dredging the minimum cross section dropped below the 2004 and 2008 conditions. Figure 11 shows the change in total volume of sand accumulated in the dredge template following inlet opening.The figure shows that over 5,500 cubic yards of sand were dredged from Section B. Over the 12 months since dredging nearly 5,000 cubic yards have accumulated in Section B.The amount of material accumulated in Section B after 12 months was much greater than the 2004 and 2008 conditions. Figure 12 shows a table of the design criteria parameters for Section B with comparisons to post dredging measurements. Recommended target values for each parameter are shown in red. Section C Outer Flood Shoal Section C represents the outer (bay side) flood shoal area of Clam Bay which is also a junction in the Clam Bay system where flow from the north and south tributaries connects to the inlet. Restriction of this area below design levels may reduce the tidal ranges in the bay system and therefore reduce tidal flow through the inlet. Only part of Section C was dredged in the 2013 maintenance dredging. This analysis is presented in part based upon the dredged portion of Section C and in part based upon the entirety of Section C. Figure 13 shows the change of average flow cross section area below mean high water for the dredged portion of Section C in 2013. The figure covers the time period from January 2013 to 12 months post dredging. This illustrates pre-dredging conditions when the inlet was closed, how the average cross section evolved immediately following dredging,4 months, 7 months, and 12 months post dredging.The figure also shows the 2008 average cross section area and the design template area dredged in 2013. The data indicate that since Section C was partially dredged the average cross section remained below the 2008 conditions. The data also shows that the average cross section area in the dredged portion of Section C was similar to the 2008 conditions at 7 months post dredging and approached pre-dredging conditions at 12 months post dredging. Figure 14 shows the change of the minimum flow cross section area below mean high water for all of Section C following inlet opening. The data indicate that since Section C was partially dredged the average cross section generally remained below the 2004 and 2008 conditions. Figure 15 shows the change in total volume of sand accumulated in the dredged portion of Section C since inlet opening. The figure shows that over 2,000 cubic yards of sand were dredged from Section C. Over the 12 month period since dredging, approximately 1,500 cubic yards have accumulated in Section C. The accumulated material in the dredged portion of Section C is greater than the conditions of 2004 and 2008. Figure 16 shows the change in total volume of sand in all of Section C including the part that was not dredged in 2013. This figure illustrates the relative amount of dredging to the total volume within the template.The figure also shows the volumes within the template for 2004 and 2008 conditions. Figure 17 shows a table of the design criteria parameters for Section C with comparisons to post dredging measurements. Recommended target values for each parameter are shown in red. dr 0 N -1 C N O d- U O O O • U Cr N O 1' ti U I) m = 7 7 E 2 o 2 2 o m m CO r N 1 ci ,-.1O O -1 \ ' O O O O Ng N N N `-I II CO 1 p rsi O / i I 11 N u 1I c1 V)CD I) m d m CES1' o Q 1CU ' p U i� m N o i • co st C1 cOv 1 II Q oo O 1' o m LL I ,-.1 4— N o • U o I (� vvi 1 m u) Lelo 1 .I \ L t II D m E I' o N C n G 1l ,--1 O 10 m i ri 3 o Go Lo ii I N 11 N c-1 O N \ O O O O O O O O p O OLn �O O O O N , ^ (1}bs)MHVU M0199 eaad UoipDas SSOJD v- O N c-1 N m co v- .-1 O O O O O N N N • i • f I I o I t I I M II II 0 cl- - 1 \ II 1I CO 0 II C - N Q • II a-' I I U al m CC)N II o C O II a) 10 O I ' N N co I Im I N O I • CU II E I- I co I°' Qm co txo I o tio0 .a I I . N L Ln a I . N Q I lD c I • co C I • m v Q I I co N ro EliD 1 ' V) 0 II a Qm a 1 I • -_ o Nj N. 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IIdA i13 i� I0 1 \ - • o > LAm I m2 I • -1 = I o bA - - IL 1 N \ N-1 0 I I N c-I O I \ I I\ O O O O O O N N ilk (AD)aleidwal a2pa1a ill Uaw!pas •c c-1 0 N c-1 N m 00 d r-I O O O O 0 N N N Cr I (I? I I. O I I I 1 I M I I cl- c-1 I I 0 N - I \ I V I ,--i ,--11 O I I m 0 U I ! - N ^'W • N I i .^ c-1 i(_ I I O I m U • mom I oC N0 < I U I I I 0 • c I 1 m �, ea I o a 4-,N co S?. .E I 0 ~ II Im o C1 I 0 v bA I N V) 0 NI a I I i a) p , L I m N as I 2 O I . up u o N I 1 O I o 0 I I NJ - N > 1 m 0 I m 2, '-I = I 0 an LL I I LoN O I I N c-1 O N I I II IO O O OO O O OO O 0is) 0 O (AD)aieldwala2paJa uiwawipas - ..* \ - +J > O ‘"'Grv O LiJ : . O, O O O O` O 0 0 0 O .-ti-0a. : < 0 O M N d' 1n n 0 0 N Ln Ln o I— Ct 1I' 0 V O d' In 0 rl c O O 0 a-, V) CD g ON N O Ln 00 O Oif) O O Lr) O O 0 ca s7- v-iLC) O m0 O N �n 0 V C d- d- A m d- m m m co U C C CO *E:: O 0 O ++ V C L O N V O 0 —'sr) 0eu a0 L-n 0 0 if) O 0 Ln O O O O � H O Ln d• 0 0 N 0 0 U L.) L)V Q I� lU d /� d' Ln d d- m 0 tnv (� CO D .y CU N aA btO 7:5 Q) a! L U -a .-1 tx0 (n ii. m n N 0 • - C m O O a tn a a O 0 t21_•°.a) co O E E N N NJ 0 I- a. a. m CD Inlet Channel Length The channel length is an important factor in the inlet stability parameters. A longer inlet channel will provide greater resistance to flow. Higher flow resistance will reduce the tidal range and increase the phase lag with the gulf tide which reduces the tidal prism and flow through the inlet. Figure 18 shows a selection of aerials showing Clam Pass from 2004 to 2013.The figure shows the range of channel orientation and change in channel length and beach width on both sides of the inlet during that period. Figure 19 shows a plot of the approximate channel length measured at the center line of the channel through Section A from open coast to the beginning of Section B. The plot shows the dredged channel length of approximately 250 feet. Pre-dredging conditions show a channel length of over 500 ft. The data shows the channel in Section A meandered to over 600 feet in length before the inlet closed in 2012. Figure 20 shows a table of the design criteria parameters for channel length with comparisons to post dredging measurements and mapping of the channel evolution since reopening in April 2013. The recommended target value for channel length is shown in red. A similar situation also occurs in Sections B and C. After dredging, these Sections behave as bay areas where sand may accumulate. As sand accumulates these areas become channelized.This channelization increases the overall channel length and adds to the flow resistance and attenuation of the bay range. When the flood shoal areas fill to capacity,the connection between the gulf and bay become a very long meandering channel that dissipates the tidal range and diminish the flow rate beyond critical conditions needed to keep the inlet open. Such conditions existed in the late nineties and in 2012 prior to inlet closure. Maintenance dredging of Sections B and C as conducted in 1999, 2002, 2007 and partially in 2013 is necessary to keep the inlet stable. Ebb shoal The size and shape of the ebb shoal is a key factor to the stability of the inlet that supports the stability of the system.The ebb shoal helps to keep the inlet open when facing storms and big wave events. The ebb shoal delta provides sheltering to the channel and sand bypass pathway around the inlet without filling it closed. The shape and volume of the ebb shoal are additional indicators of the stability of the inlet. Ebb shoal critical conditions include onshore collapse of the ebb shoal that can be indicated by significant change in ebb shoal offshore distance, volume, and increase in dry beach areas adjacent to the inlet. Figure 21 shows a table for the ebb shoal design criteria parameters and monitoring measurements since inlet opening in April 2013. Recommended target values for the ebb shoal are presented in red. •i t )111,1„ N —.... r� _. .. 9 O v • 4114 r paapaaa • N t} t • 0 -•• sf _ N0 Q M c-1 0 NI pagpaaa 0 0 c iii ,._ . ., , L7) 0 O ..,..,,,- , ..--- . .. OO: ... ..- - - ..«v+ c-1 W s `* _ L N :_ ,_ ra O N N fB 0- E roU oci ,<i { r.:,A.t is I I �-Y Q au • a- e--i 0 N N N N e1 M CO O sH 4'4'444\\ N O \ N d' cI i. W Q a) OA N N e-1 0O ci d. .0 O e1 4.0 O 0.0 ....__. W W \ -I—iC C W C CD C o O CD O N N U up p .� a) U a-+ N CO 0 . O X No - Q N 110 o LZ O N J Q Ors/ N Q .� fB a E Q O X 'CS O O 0.0 - Q 'o 0Q O Q al i En 7 O bA O LL N 00 N N 0 0 N } a O O O O O O O O O p O OLc) V O O O c-I (alewixoadde-laa;)yp2uai iauueu e "11111(1111111111111111111\ • 724* .,- /14t'U . . t _ *` : �"' a� - -------,J,:?"--,::--'. 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O cogc st N N r-I c-i rl r-I -i _ > a> W v 7 LID E t '5 w 2 = c N N t0 c — o c-I Ln C Ol E NU C LL CU c 0 Nin n r-1 N N c-I W p v Nn 4.+ in 13 -a .0 +-' X .' Nu 12w ai s= c W 0 c C O V) N O In RS Q m ' s-' 0 U 0 0 0-a) 0 w co Z N v - co tio -' S? S2 1-- Nn �' Q > O O p F� i O D N Z , i Ni m -En Cl... a 01 lD r+ Summary and Recommendations: This draft provides the main interrelated inlet stability indicators to be monitored for the management of Clam Pass. The inlet design criteria include "target" ranges to be observed for the following parameters; Bay Tidal Range, Average and Minimum Cross Section Flow Area, Volume of Shoaled Material within the template, Channel Length and Ebb Shoal Size and Area. The following monitoring measures are recommended to be included in the inlet management plan. 1. It is recommended to continue to monitor the tide range in the bay on monthly basis to understand the level of hydraulic stability of the system. Based on previous tidal data monitoring records, inlet flow stability can be indicated when the tidal range ratio remains above 0.6. If the monthly tidal range ratio drops below 0.6 but above 0.5, further monitoring is needed to observe monthly trends. If the range drops below 0.5 or displays a downward trend for three consecutive months, then physical monitoring surveys should be done promptly to evaluate potential shoaling areas that could be impeding the tidal flow. 2. The physical monitoring data is important to quantify the flow areas and shoaling throughout the dynamic parts of the system. It is necessary to continue to monitor the physical changes in the inlet annually under stable hydraulic monitoring indicators. However, It is recommended to monitor the physical changes at 6 month interval when possible. If tidal monitoring data show relative tidal ranges in the critical range, field observation while continuing to monitor the tidal range for the following months are necessary. If the hydraulic monitoring indicates a continued trend down towards the unstable range, then additional physical monitoring should be done as an emergency survey to quantify shoaling areas and examine need for maintenance dredging. 3. The design criteria identified in this report should be used as indicators to the level of stability for the inlet. When dredging is deemed necessary, it is recommended to follow the design cross section areas as stated in the design range with consideration to existing conditions at the time. Some modifications to the dredging template are recommended for future permitting. These are intended to create a template that more closely mimics stable inlet conditions and to provide simplified design cut dimensions based on the NAVD survey datum. 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