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Agenda 08/31/2016 mT LE r- PELICAN BAY SERVICES DIVISION I0, Q 1_,J Municipal Service Taxing and Benefit Unit ) �� NOTICE OF PUBLIC MEETING AUG F�� - THE CLAM BAY COMMITTEE OF THE PELICAN BAY SERVICES DIVISION WILL MEET AT 12:30 PM ON WEDNESDAY, AUGUST 31 AT THE PELICAN BAY SERVICES DIVISION, 3RD FLOOR OF THE SUNTRUST BUILDING, SUITE 302, LOCATED AT 801 LAUREL OAK DRIVE, NAPLES, FLORIDA 34108. AGENDA 1. Roll call 2. Agenda approval 3. Approval of 06/30/16 meeting minutes 4. Audience comments 5. Mangrove die-off a. THA July and August reports b. H&M tidal ratio data for July and August c. Water level data for 2015 and 2016 d. Shoal and meandering channels restricting flow e. Extent of tidal exchange f. Hand-dug channels g. Intervention strategies 6. Clam Bay monitoring a. Gopher tortoise survey b. Budget and expenses c. H&M approved and draft proposals d. Aerial photos e. Maintenance of tidal gauges f. Monitoring of mangroves in 2017 7. Water quality a. Copper data for May and June b. Tomasko quarterly report on total phosphorus and total nitrogen c. Monthly copper table update 8. Canoe trail guide 9. Osprey nesting platform 10. Infrared aerial photo 11. Clam Bay— related reports, proposals and updates 12. Next meeting: September 26, 27, or 28 13. Adjournment ANY PERSON WISHING TO SPEAK ON AN AGENDA ITEM WILL RECEIVE UP TO THREE (3) MINUTES PER ITEM TO ADDRESS THE BOARD.THE BOARD WILL SOLICIT PUBLIC COMMENTS ON SUBJECTS NOT ON THIS AGENDA AND ANY PERSON WISHING TO SPEAK WILL RECEIVE UP TO THREE(3)MINUTES. THE BOARD ENCOURAGES YOU TO SUBMIT YOUR COMMENTS IN WRITING IN ADVANCE OF THE MEETING. ANY PERSON WHO DECIDES TO APPEAL A DECISION OF THIS BOARD WILL NEED A RECORD OF THE PROCEEDING PERTAINING THERETO, AND THEREFORE MAY NEED TO ENSURE THAT A VERBATIM RECORD IS MADE, WHICH INCLUDES THE TESTIMONY AND EVIDENCE UPON WHICH THE APPEAL IS TO BE BASED. IF YOU ARE A PERSON WITH A DISABILITY WHO NEEDS AN ACCOMMODATION IN ORDER TO PARTICIPATE IN THIS MEETING YOU ARE ENTITLED TO THE PROVISION OF CERTAIN ASSISTANCE. PLEASE CONTACT THE PELICAN BAY SERVICES DIVISION AT (239) 597-1749. VISIT US AT HTTP://PELICANBAYSERVICESDIVISION.NET. 08/23/2016 9:43 AM PELICAN BAY SERVICES DIVISION CLAM BAY COMMITTEE MEETING JUNE 30,2016 The Clam Bay Committee of the Pelican Bay Services Division met on Thursday, June 30 at 1:00 p.m. at the SunTrust Bank Building, 801 Laurel Oak Drive, Suite 302,Naples, Florida 34108. In attendance were: Clam Bay Committee Bohdan Hirniak Susan O'Brien, Chairman Gary Ventress Pelican Bay Services Division Staff Mary McCaughtry, Operations Analyst Neil Dorrill, Administrator Lisa Jacob, Associate Project Manager Marion Bolick, Operations Manager Barbara Shea, Recording Secretary Also Present Mohamed Dabees, Humiston& Moore Mike Shepherd, PBSD Board Tim Durham, County Manager's Office Jeremy Sterk, Earth Tech Arielle Poulos, Turrell, Hall & Associates Dave Trecker, PBSD Board Jeff Rogers, Turrell, Hall & Associates APPROVED AGENDA (AS AMENDED) 1. Roll call 2. Agenda approval 3. Approval of 04/26/16 meeting minutes 4. Audience comments 5. Mangrove die-off report and photos a. Rainfall data (add-on) 6. Tidal gauge data a. June 1-27 tidal gauge data b. Historical tidal gauge data 7. Hand-dug channels in Upper Clam Bay a. Missing channels b. Additional work or channels needed c. Permit that may be needed 8. Shoal and meandering channels impacting tidal flow a. Location b. Previous work and bathymetric surveys done in this area 9. Monitoring and restoration of mangrove die-off a. Post construction monitoring (add-on) 10. Extension of FDEP dredging permit 11. Timeline for osprey nesting platform near Marker 36 12. Performance to date of tidal gauges 1 Pelican Bay Services Division Clam Bay Committee Meeting June 30,2016 13. Copper results 14. Total nitrogen and total phosphorus results 15. Next meeting: August 31, September 1 or 2 16. Other 17. Adjournment ROLL CALL All members were present and a quorum was established AGENDA APPROVAL Mr. Hirniak motioned, Mr. Ventress seconded to approve the agenda as amended with the addition of Items #5a and #9a. The motion carried unanimously. APPROVAL OF 04/26/16 MEETING MINUTES Mr. Ventress motioned,Mr. Hirniak seconded to approve the 04/26/16 meeting minutes as presented. The motion carried unanimously. AUDIENCE COMMENTS None MANGROVE DIE-OFF REPORT, PHOTOS, OPINIONS,AND MONITORING Ms. O'Brien reviewed the highlights of Mr. Tim Hall's 6/24/16 status report on the Upper Clam Bay mangrove die-off. She reported that the mangrove die-off area has doubled in size since January 2016, is estimated at 15 acres, and that Mr. Hall is not convinced that any new digging of hand-dug channels is required at this time. Mr. Jeff Rogers, Turrell, Hall & Assoc., suggested the possibility of the occurrence of a natural transition in Upper Clam Bay of the white mangroves being replaced by red and black mangroves, which have a much better survival rate in a wetter environment. He has observed new growth of the red and black mangroves, although cannot supply data to quantify it. Ms. Arielle Poulos, Turrell, Hall & Assoc., suggested the possibility of a lengthy time lag between the dredging of Clam Pass and seeing improvement in the tidal flow to Upper Clam Bay. Mr. Rogers stated that Turrell, Hall &Assoc. will continue to monitor the die-off area and provide updates in 30 and 60 days and include percentages of white, red, and black mangroves in the die-off areas along with information on any new growth observed. Dr. Mohamed Dabees, Humiston&Moore, reported on his"spot elevations"taken in Upper Clam Bay which show water levels two feet above normal. He noted that in general,there are no changes in water depths of Clam Bay and its main channels since 2008, and he has observed no restrictions of water flow. Dr. Dabees recommended continued monitoring of water 2 Pelican Bay Services Division Clam Bay Committee Meeting June 30, 2016 levels and the size and composition of the die-off area; he recommended no digging of hand-dug channels at this time. Ms. Linda Roth commented on (1) the ability of mangroves to survive in fresh water, and (2) the ability of red mangroves to survive in high water levels, followed by black mangroves which have a lesser ability, followed by white mangroves which have the lowest survival rate. RAINFALL DATA (ADD-ON) Ms. O'Brien reviewed a document, "Rainfall in inches at Naples Airport"which provided monthly rainfall for the last 30 months; total rainfall in 2015 was 30% less than 2014. The document was added to the record. TIDAL GAUGE DATA Ms. O'Brien reviewed the tidal gauge data reports for February through June 27, prepared by Humiston& Moore, which indicate that the current tidal exchange at the northern end of Clam Bay is similar to what it was before the April dredging event. Dr. Dabees recommended continued monitoring. HAND-DUG CHANNELS IN UPPER CLAM BAY Ms. O'Brien reviewed Mr. Tim Hall's recent report stating that he is not convinced new hand-dug channels are required at this time. Mr. Dorrill commented that he will have continued discussions with our Clam Bay consultants to determine whether to begin the process of obtaining permits for new hand-dug channels and report back to the committee. POST CONSTRUCTION MONITORING (ADD-ON) Mr. Dorrill reported that Dr. Dabees has provided a post construction(Clam Pass dredging) monitoring proposal. All County Fund 111 and TDC funds budgeted for the Clam Bay dredging project have been depleted. Mr. Dorrill will meet with the Collier County Office of Management& Budget to request additional funds to pay for Humiston& Moore's proposal. EXTENSION OF FDEP DREDGING PERMIT Dr. Dabees confirmed that the request for a 5 year extension for our FDEP dredging permit has been approved; the new expiration is 2027 (expiring at about the same time as the USACE dredging permit). TIMELINE FOR OSPREY NESTING PLATFORM NEAR MARKER 36 Mr. Dorrill reported that the Pelican Bay Foundation has agreed to allow the PBSD to build an osprey nesting platform on their property near Marker 36. Mr. Hoppensteadt, PBF President, has suggested that the PBSD choose an appropriate location. Mr. Jeremy Sterk, Earth Tech, will assist the PBSD with this task. The approximate cost to the PBSD is $3,500; the PBF will not share in the cost. PERFORMANCE TO DATE OF TIDAL GAUGES Mr. Sterk reported no performance issues of the tidal gauges other than a few minor glitches in the modem. 3 Pelican Bay Services Division Clam Bay Committee Meeting June 30, 2016 COPPER RESULTS Ms. O'Brien reported that Clam Bay copper results for March and April were good; all nine sampling sites met the FDEP's criteria for copper. TOTAL NITROGEN AND TOTAL PHOSPHORUS RESULTS Dr. Trecker reported that total nitrogen and total phosphorus in Dr. Tomasko's report for the quarter November 2015 —January 2016 are within FDEP criteria, except for TP at one site in Upper Clam Bay. The high level of phosphorus at this specific site has been an issue in the past and will continue to be monitored. The next quarterly report is expected in August. NEXT CLAM BAY COMMITTEE MEETING By consensus,the committee agreed that the next meeting of the committee would be on August 31 at 1:00 p.m. ADJOURNMENT The meeting was adjourned at 2:27 p.m. ' Susan O'Brien, Chairman Minutes approved [ ] as presented OR [ ] as amended ON [ ] date 4 Agenda Item#5a-1 Page 1 of 5 TURRELL, HALL & ASSOCIATES, INC. MARINE & ENVIRONMENTAL CONSULTING 3584 Exchange Avenue, Suite B •Naples, Florida 34104-3732 • (239) 643-0166 • Fax(239) 643-6632 MEMORANDUM TO: PBSD Clam Bay Committee c/o Neil Dorrill FROM: Tim Hall DATE: August 15,2016 RE: July Report on Mangrove Die-off status DIE-OFF STATUS I'm starting to feel a little more optimistic regarding the status of the new die-off area in the northern portion of the Clam Bay system. In January 2016 I had estimated about 7.76 acres of dead areas. Based on aerials flown and ground trothing conducted in May and June,I had reported that dying and stressed areas of concern had increased to approximately 15 acres and I was concerned that leaf loss could still be experienced in additional areas within the system. However,the latest groundtruthing has indicated that some leaf regeneration is underway(predominately on red and black mangroves). We are also starting to see more seedling regeneration and sapling growth within the previously dead areas. There is still a lot of stress evident but the acreage where the largest portions of the mangroves has dies is currently estimated at about 8.58 acres. This is worse than the initial January estimate but better than my fear of the expansion area from June. The recent dredging of the Pass seems to have improved the drainage capabilities within the upper reaches of the system and we are not seeing the prolonged inundation that we witnessed during the heavy rains earlier in the year. Water elevations appear to be maintaining normal levels even with the afternoon rains we have been receiving. I still maintain that additional channels are not necessary with one possible exception. I am currently exploring the drainage capability from immediately adjacent to the Strand wall out to the Bay. There are no blatant blockages or low areas holding water but having a secondary outlet along this structure could help in the future if we get into a similar situation. I should have more defined information regarding this during our August report. I have included a few additional photographs with comparisons from previous reports so that the Board can see that some regeneration is occurring. Sincerely, Tim Hall Senior Ecologist Agenda Item -1 #5a 5 Page 2 of w 'i i , l't: .. ',,, -t ,�fi . ' „10 , , , „,1.:..,f' t. :,,! # x �� 2-11'.';4' "� ` , � qy ,, tom `# 4 #, ft4"E 3 y q tr W.nA A ,}'Y iEy ‘,;'-alit.It. e 2 • 00 ,k,7,7., ,,..1i , _.t.t„........_.,. .., yy., , 1 k k; "t ax \- .,,,;.-;•\ 'eo-_,,, , A , ,• ° _,t+.714‘. # - °t 'look � x ,, c ° •fr�,"a S f ,' 4 g,'yaw 3 ., P lY a 4 �.: 1 fit � ` t tr iY � r 44, i - 1 ----1' - -..• -- 'ir--, i4,.4,:, *,--_ , -i*4't- * -;i6-0 . --/..,-'-.!" sem'' �a` � *II 4. ' �p- �.:. d„,. a 3iii ".fit , , , ilk t. 4p r • , ' j , ' 314 s,_ # ? a �" ,:,,,,,,..„ ' „e:,,,lz\ . iv -� r . ; �r � �^' �� l. ii €'_ # � � '.. 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"I''' * 7,; fi ,� � •'b t ,+a � �#, � '� .'-* ...,:'11 I. wisal o -" '¢fir 'i: fil — P:\8845 Clam Bay\DRAWINGSISHEE11DIE-OFF MONTHLY1201&DIE-OFF.dwg JULY OVERLAY 8115/201D Agenda Item#5a-2 Page 1 of 3 TURRELL, HALL & ASSOCIATES, INC MARINE &ENVIRONMENTAL CONSULTING 3584 Exchange Avenue, Suite B •Naples, Florida 34104-3732 • (239) 643-0166 • Fax(239) 643-6632 MEMORANDUM TO: PBSD Clam Bay Committee c/o Neil Dorrill FROM: Tim Hall DATE: August 26,2016 RE: August Report on Mangrove Die-off status DIE-OFF STATUS I have to start off this month's memo with a correction from last month. We had made a mistake in calculating the estimated acreage of the die-off and I had passed that mistake along in the memo. We caught it while calculating the most current estimate and I wanted to make sure that the correction was passed along to the Board. In January 2016 I had estimated about 7.76 acres of dead areas. Based on later aerials flown and ground truthing we had increased our estimate to approximately 15 acres. The July report stated that the dead acreage estimate was 8.58 acres when it should have stated 11.52 acres. We are still seeing some seedling establishment, leaf regeneration, and sapling growth within most of the identified die-off areas. However,we are also still seeing indicators of stress throughout the area as well such as reduced leaf growth,yellowing leaves,fungal growth,and some evidence of borers. Based on the latest aerials taken on August 24, the die-off acreage is estimated at about 11.05 acres so no appreciable change from the July acreage. This is helping to alleviate my fear that the area of die-off could keep expanding. The improvements to the drainage capabilities within the upper reaches of the system realized with the recent dredging of the Pass seem to still be working. I have not seen larger areas of prolonged inundation that we were observing. Water elevations still appear to be maintaining normal levels even with the afternoon rains we have been receiving. FLUSHING CHANNELS Further investigation of the area along the Strand wall lead me to believe that an additional channel here could be helpful in extreme conditions but is not absolutely required at this time. There is one other small area I have identified that could benefit from some additional flushing. There is a small 0.5 acre or so area located midway between the lower end of Upper Clam Bay and the Strand that has not recovered since the original 1995 die-off. There is a possibility that a couple of small channels could improve the conditions in that area enough so that some regeneration could get started. We will continue to evaluate this area and report on it in our next update. Sincerely, Tim Hall Senior Ecologist Agenda PItemage#5a-22 of 3 '' "Vk...l''''. A Lew—*,, ae. «e'. & -av'�' . 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Marker 32 s Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Definitions: Mean Tide Ratio:ratio of Gulf of Mexico mean tide over gages mean tide,averaged over a month.This ratio is representative of the pass's effectiveness in flushing water from the bay.The lower the ratio,the less efficient is flushing,indicating material accumualting in the pass. Mean Low Tide Lag: time difference between low tide in the Gulf of Mexico and at the gage's locations,averaged over a month in minutes.The time lag is also represenattive of the pass's effectiveness in flushing water from the bay.The higher the lag the less efficient is flushing,indicating material accumulating in the pass. Background Clam Pass is a small wave dominated inlet on the southwest coast of Florida that provides a tidal connection to 500 acres of the wetland preserve of Clam Bay Natural Resource Protection Area(NRPA).This preserve includes several interconnected bays surrounded by extensive areas of mangrove wetlands.The preserve is a pristine environmental resource that is collectively known as Clam Bay.Clam Pass has gone through periods of inlet migration as well as closure,because the relatively small tidal prism for Clam Bay provides critical balance between tidal energy and littoral process at the inlet channel. http://www.humistonandmoore.com/ 8/25/2016 Page 1 of 1 Agenda Item#5b-1 Page 2 of 2 awn Pass tide Dasa Jul 2916.P,NAV° 2 I. I_.....4 1 M I 1 3 I" 1 L......+ p......+ I ! i......_.1 1 f.......' t ! { •2 -1 ... 4 .... .... .1. ...1...... 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L,.2,..Y.,..7.+.„ t .,.. . . ., .., P:': i '7: , .. .., Monthly Time Series 2016(Click on Thumbnails to Expon.:1; ..1 an Feb --,!ar Apr May Jun .i,, A Li g Se;: tTic.: Ncv Dec \,,..... Gulf/Gage Mean Tide Ratios - 2016 0.9 PASS 0.8 DREDGING 0.7 0.6 ra . n Marker 4 ce ,.. cJ0.5 Marker 14 )r: 0.4 , , c . t I , E3 Marker 26 nr . . ,. ca 0.3 .,-.-, 1 ,. ; I. i L2 Marker 32 — I I 7-.- I 0.2 , -, 7 i i q,. -. 0.1 - . 0 - __ .. Lt a ._.1. Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Mean Low TideTime Lag - 2016 300 - PASS DREDGING 250 - tv 4., = . c i;200 , 4•'7, nMarker 4 , . fq 150 qt• it.f 3i' 1 ' Marker 14 0 Marker 26 . .,, 7 , ‘,. .4 , . I— 100 - ,, . , , it. , ''.: ',.* , ,. LI ' ;.:::. , ::...' ,:,..1 ', , ri ,-;.- : , Marker 32 $,„ . 50 al ill , ,,,t, ; ,„ , ,, ,,,,, t*I lk" r., ' V ., ' ' ti 11: I" , r!..k. ! -::,• -11 i 1 1...., A ,,.. 0 4 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Definitions Mean Tide Ratio ratio of Gulf of Mexico mean tide over gages mean tide, averaged over a month This ratio is representative of the pass's effectiveness in flushing water from the bay The lower the ratio, the less efficient is flushing indicating material accumualting in the pass Mean Low Tide Lag:time difference between low tide in the Gulf of Mexico and at the gages locations,averaged over a month in minutes The time lag is also represenattive of the pass's effectiveness in flushing water from the bay,The higher the lag the less efficient is flushing indicating material accumulating in the pass NN I I i R I I IP' t 1 iR 1 I IR 1 I T14 45 inti n- °' a a c CDCM Qh=-� ...._ _._. ._- ...... g ler Aat R t . . : •e - tee, r .„.,,T r ...... quo S. w.. >>ee�rt 7 .a.,Kms. ,. � r '... ..,.r.^ `:�" • _...._ ...r -...w .. a A- 8 .1..-.. r Sf , r' _ � a '" cis ~ - ^ co I 1 .. 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Viad.,. y,., 'q,' � £'e^naar w . • _ I. • � • y; � •!..4".",•-_,,,--,X,.:. �° +��� ••,•.;':'' �:;:z • im '+R Bi . 43 p>.q % q i^R " j- y x - g yy7'm°T. , • allitNitillikAiiNIASIANIgiiiiiiiiiiiiiiti h "'° " C � .< ,*,��m` �'i t 'ham �, gtl ., ry s' \ 41 j .C1.£:F11F4YC[Ttt.c.C�t'f} - - ,.# 2VdLY _ , "?; r, , & g imi r l �+ t % s ?.ry =k # a- • ....... Agenda Item#5e Page 2 of 2 "" ,sem 44. . ' .�- wx .. ; " elowitit ,N,,.:. a" ,,„,,,.. Ar• •-.1.-.44:00.:;'14.‘',:::-,7'..• �r�' tre �r „i.• . ,,h,: f, #"sei � s� £ ''.-4.t,-,7.„,,,,',#‘-,",-* n �3 F ;s• '`' t,— 4 t zE,� -1 V+y� �p�, .€ .P <'" teT' -�` # pi t " " • g,•„;,r,,,..4;,,,;„4":47..,,,,,,,.,,e,„„i'_.4'074.:,_ ,. yae5,,:V. y � �"� s �:„" ` rY-FT .4- ¢'y a. sl • y,,, - ^p3wP' r .-+K • � 6az r y"x'. t {�x -tfiitA it.,, �r �� . y� a�§ ca �."y 5 ' w �* , - 3 . :e4n fi' ; s 'dw dA , `� .r�E��ax z � s S rk `� � aa' t �' � ,°tio z 1,44 . +< „ P'. , , Agenda Item#6a max t M t, \ ,/ 'f '01.1. „y r,'Y • 5 ' .;ate- a,? '.• {• ' a ,,” .yid .7'4,-"'"e661 ,-a t i'i H arp 4. .:„ ` e -a! 14". R t e „... y Ky ' ya*y '�;.t, F.� st t it ilitl .. ...-t4-.1t, ....v.,'.4.4,,. ,.. i'; i �y - *' * gy 1 6'`4 i- & ..„.....iit r 2 L �t 5 , r;"" . .0 4 4',,,e. A t "" ' CLAM BAY NR BOUNDARY I: 3 �ga , _� _ GOPHER TORTOISE SURVEY(2016) • o Active Adult GT Burrow(72) •' 0 Active Juvenile UT Burrow(6) , " o Abandoned UT Burrow(24� ;� R o Potentially Occupied Adult GT Burrow(51) ;.- ti 1jk,0. i o Potentially Occupied Juvenile GT Burrow(12) ,pite ;�xj;p 1 sso ,'.foo _,•,,,,,t 400a E,,,.,..\'.4,41' .a: ''' "°".,., #,r ,M1 r 3+t T� �) EARTH TECH 1,1;1.VERON ME NTAL,.LLC GOPHER TORTOISE SURVEY PELICAN UA1 EARS H TE H€ BLVD, SUITE B ElCounfr',Florida NAPLES. FLORIDA 341)O o D s xwa.xo. wux `J PHONE 4239)304-0030 FAX (239)324-0.054 08/19/16 NSA AS SHAWN Agenda Item#6b-1 Page 1 of 5 Clam Bay Budget and EapOnals—Aug. 22,2016(DRAFT) Current contracts,budgeted expenses,and other monitoring required In Clam Bay Management Plan $84,750*1 Earth Tech Clam Bay monitoring 11,000'2 Humiston & Moore Tidal monitoring analysis and monthly tidal ratio tables 41,815*3 Turrell, Hall Water quality monitoring 34,5001'4 Turrell, Hall Mangrove Die-off monitoring 31,725 JA Aquatics Hand dug channel maintenance 38,000 Tree trimming 13,000 Contract labor 7,500 infrared aerial photo 17,500 Reserves for contingencies 6,300 County collection fees Annual tidal analysis and bathymetric reports Additional reports and monitoring as needed 286,090+ Proposed monitoring $19,9506 Clam Pass monitoring 25,500' Annual bathymetric and tidal analysis reports Other expenses for FY16 5,093 Turrell, Hall Copper test results 9,444 Turrell, Hall Interim mangrove die-off monitoring 12,750 Turrell, Hall 2015 annual Clam Bay report 16,782 Humiston & Moore 2015 Bathymetric report and other work New tidal gauges 17,600 JA Aquatics Water management work in Basin S in Ray Colony 61,669+ Revenue for FY16: about $357,000($135,000 from assessment and $80,000 carry forward from PB50 320, and $150,000 from County 111 Dredging-related expenses in FY16(County Fund 195) $474,000 for contractor 64,634 Humiston & Moore dredging-related services 74538 Turrell, Hall work on 10 year dredging permit $546,171 Covers objectives 1,4 &5 of Clam Bay Management Plan. 2 Relates to objective 2 of Clam Bay Management Plan. I Covers objective 3 of Clam Bay Management Plan. PO for$8625 of this amount has been issued. Revenue for FY17 will be about $270,000($120,000 from PBS() 320 and $150,000 from County 111) 6 Relates to objective 2 of Clam Bay Management Plan. Relates to objective 2 of Clam Bay Management Plan 8 Revenue for FY16 is about $357,000(5127,000 from assessment and $80,000 carry forward from PBS() 370 and $150,000 from County 111) •FY16 ends Sept. 30 so some of expenses occur in FY16 arid some in FY17. etAm BAY NRPA MANAViVat6hAN Pelican Bay Services Division (ktoher 2014 Ver.6.5 Objective I - Maintain and protect the native floral and faunal communities within the Clam Bay NRPA This objective is focused on ensuring natural resource protection and long-term sustainability by evaluating and prioritizing available relevant inti about the estuary in order to develop and implement a cohesive management strategy that protects the native floral and faunal communities. A. Maintain healthy,native floral and faunal populations. 1) Establish plots and photo points in Coastal Scrub and Cabbage Palm Hammock habitats and monitor periodically. 2) Monitor established plots in the mangroves periodically. 3) Monitor established transects in the scagrasses periodically. 4) Monitor benthic organisms periodically. 5) Monitor wildlife within the NRPA periodically. 6) Determine through regular biological monitoring whether intervention strategies are necessary to protect the ecological health of the NRPA. B. Protect listed Species. 1) Identify and detennine the status of listed floral and taunal species and associated habitats to the extent possible. 2) Monitor gopher tortoise burrows periodically. 3) Acquire Collier County sea turtle nesting data as they become available. 4) l/pdate educational information on species, such as the Clam Bay Guide,as needed C. Remove Exotic and Nuisance Flora and Fauna. I) Locate and identify exotic and nuisance species within the Clam Bay NRPA 2) Remove, or report to the responsible entity for removal,Category 1 and II invasive exotic species and nuisance species as needed. 39 CLAM BAY NRPA MANA6110.0215AN Pelican Bay Services Division October 2014 Ver. 6.5 Objective 2 -- Ensure the estuary has adequate tidal and freshwater flaws to maintain ecological health within the Clam Bey NRPA N%(thickis focused on managing hydrology and CVdi Wiling freshwater inputs to the Clam Bay NRI'A. A. Identify the minimum tidal flow necessary to ensure a healthy ecosystem. Provide sufficient tidal exchange to maximize benefits while minimizing negative environmental inipacts. Conduct periodic bathymetric surveys of Clam Pass, 2) Conduct periodic analysis of tidal data. 3) Maintain tidal gauges. 4) Conduct bathymetric surveys of interconnecting waterways when needed. 5) Iktennira: whether ecological benefits of intervention activities outweigh potential negative ecological impacts. 6) Monitor identified variables of Clam Pass conditions to determine when dredging is needed. (See Chapter 5.0 and Appendix 5 for information on variables.) 7) Seek appropriate federal and state permits to dredge Clam Pass or interconnecting waterways if needed. B. Ensure appropriate freshwater inputs and drainage. 1) Identify freshwater inputs(quantity, qualityand timing). 2) Evahote effects of freshwater inputs on existing native communities and develop remediation strategies if needed. 3) Conduct periodic monitoring of hand-dug channels. 4) Perform periodic maintenance of selected sections of hand-dug channels. Objective 3—Monitor and maintain water quality within the('lam Ray NRPA This objective is focused on ensuring compliance with State and Federal water quality standards and reducing pollutant inputs to maintain ecological health. A. Develop a long-term water quality program that ensures a sustainable healthy environment for all users. 1) Follow a program of water-quality data collection and analysis that addresses the site specific alternative criteria and methodologies approved by the FDEP. 2) Sample monthly from sites used to establish FDEP site specific alternative criteria. 3) Lnsure sampling and testing protocols comply with 1.1)1T guidelines and standards 4) Develop intervention strategies when standards arc not met. 5) Enter data into STORET system annually 6) Continue efforts to address copper impairment in the Clam Bay NRPA. 40 CLAM BAY NRPA MANA06I 1 ,4/1 Pelican Bay Services f)ivisi on October 2014 Ver. 6.5 B. Promote programs for controlling water pollution from point and nonpoint sources. I) Promote Best Management Practices for fertilizer and irrigation use. 2) Promote programs to reduce algae levels in upland stormwater ponds. 3) Promote programs to reduce copper input into stormwater ponds. 4) Investigate new methodologies for controlling water pollution. Objective 4—Monitor archaeological sites within the(lam Kay NRPA -Ibis objective is focused on recognizing the presence and importance of archeological sites within the Clam Bay NRPA. A. Monitor conditions of known archaeological sites. I) Review historical records of l°iorida Division of historical Resources(f)IJR)on known archaeological sites. 2) Inspect known archaeological sites periodically. 3) Report findings as appropriate to UHR. B. lerpktnent strategies for the protection of archaeological sites as needed. Objeal%e 5—Ensure recreational activities are environmentally compatible within the(`tam Nay NRPA this objective is focused on recognizing recreational uses,ensuring that public use facilities arc maintained. monitoring associated impacts to the estuary.and promoting public awareness and stewardship of this sensitive area. A. Monitor access and the condition of the facilities for recreational uses. I) Report vegetation needing to be trimmed to the responsible entity. 2) Report litter needing to he removed to the responsible entity. 3) Report facilities needing to be repaired or replaced to the responsible entity. B. Maintain existing canoe trail. I) Inspect signage periodically. 2) Repair or replace trail marker signage as needed. 3) Repair or replace caution seagrasss and shoaling signs as needed. 4) Revise and/or reprint the Canoe Trail Guide as needed. ['. Maintain existing signage for safe swimmer and boater usage. 1) Inspect signage periodically. 2) Repair or replace signage as needed. I). Monitor use of facilitieslarea for recreational uses. i) Encourage citizens to report unsafe or environmentally harmful use, 2) Coordinate with responsible entity to enforce the laws and regulations as needed. 41 CL•441 RAY NRPA MAN 4I isAN Pelican Hay Services Division (ktobcr 2014 Vcr. 6.5 3) Continue to support the use of the Clam Ray NRPA for low-impact recreational uses. E. Maintain materials to educate visitors about the unique features of the Clam Bay NRPA. 1) Inspect educational signage periodically. 2) Report signage needing repair or replacement to the responsible entity. 3) Update (lam Ray Guide as needed, Reporting Regular reports will be prepared at least annually,summarizing the data collection and management activities. Reports will evaluate datasets by comparing results to baseline conditions(if known)or through trending analysis. Additionally, reports will recommend whether any intervention strategies or actions are necessary to meet the objectives. rhe goal and all objectives will be evaluated at least annually in conjunction with past and present research programs conducted within the('lamm Hay NRPA to determine ecosystem status. If progress in achieving objectives is not favorable, then the methods will be re-evaluated and updated as needed. Alternative methodologies will be explored, it'warranted. to achieve progress in meeting the goal of maintaining the health of the Clam Ray NRPA. 42 Agenda Item#6b-2 Page 1 of 4 CLAM BAY NRPA MANAGEMENT PLAN Pelican Bay Services Division October 2014 • Ver. 6.5 Objective 1--Maintain and protect the native floral and faunal communities within the Clam Bay NRPA This objective is focused on ensuring natural resource protection and long-term sustainability by evaluating and prioritizing available relevant information about the estuary in order to develop and implement a cohesive management strategy that protects the native floral and faunal communities. A. Maintain healthy, native floral and faunal populations. 1) Establish plots and photo points in Coastal Scrub and Cabbage Palm Hammock habitats and monitor periodically. 2) Monitor established plots in the mangroves periodically. 3) Monitor established transects in the seagrasses periodically. 4) Monitor benthic organisms periodically. 5) Monitor wildlife within the NRPA periodically. 6) Determine through regular biological monitoring whether intervention strategies are necessary to protect the ecological health of the NRPA. B. Protect Listed Species. 1) Identify and determine the status of listed floral and faunal species and associated habitats to the extent possible. 2) Monitor gopher tortoise burrows periodically. 3) Acquire Collier County sea turtle nesting data as they become available. 4) Update educational information on species, such as the Clam Bay Guide,as needed. C. Remove Exotic and Nuisance Flora and Fauna. 1) Locate and identify exotic and nuisance species within the Clam Bay NRPA. 2) Remove,or report to the responsible entity for removal, Category I and II invasive exotic species and nuisance species as needed. {. 39 Agenda Item#6b-2 Page 2 of 4 CLAM BAY NRPA MANAGEMENT PLAN Pelican Bay Services Division October 2014 Ver. 6.5 Objective 2—Ensure the estuary has adequate tidal and freshwater flows to maintain ecological health within the Clam Bay NRPA This objective is focused on managing hydrology and evaluating freshwater inputs to 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. 1) Conduct periodic bathymetric surveys of Clam Pass. 2) Conduct periodic analysis of tidal data. 3) Maintain tidal gauges. 4) Conduct bathymetric surveys of interconnecting waterways when needed. 5) Determine whether ecological benefits of intervention activities outweigh potential negative ecological impacts. 6) Monitor identified variables of Clam Pass conditions to determine when dredging is needed. (See Chapter 5.0 and Appendix 5 for information on variables.) 7) Seek appropriate federal and state permits to dredge Clam Pass or interconnecting waterways if needed. B. Ensure appropriate freshwater inputs and drainage. 1) Identify freshwater inputs(quantity,quality, and timing). 2) Evaluate effects of freshwater inputs on existing native communities and develop remediation strategies if needed. 3) Conduct periodic monitoring of hand-dug channels. 4) Perform periodic maintenance of selected sections of hand-dug channels. Objective 3—Monitor and maintain water quality within the Clam Bay NRPA This objective is focused on ensuring compliance with State and Federal water quality standards and reducing pollutant inputs to maintain ecological health. A. Develop a long-term water quality program that ensures a sustainable healthy environment for all users. 1) Follow a program of water-quality data collection and analysis that addresses the site specific alternative criteria and methodologies approved by the FDEP. 2) Sample monthly from sites used to establish FDEP site specific alternative criteria. 3) Ensure sampling and testing protocols comply with FDEP guidelines and standards. 4) Develop intervention strategies when standards are not met. 5) Enter data into STORET system annually 6) Continue efforts to address copper impairment in the Clam Bay NRPA. 40 Agenda Item#6b-2 Page 3 of 4 CLAM BAY NRPA MANAGEMENT PLAN Pelican Bay Services Division October 2014 Ver. 6.5 B. Promote programs for controlling water pollution from point and nonpoint sources. 1) Promote Best Management Practices for fertilizer and irrigation use. 2) Promote programs to reduce algae levels in upland stormwater ponds. 3) Promote programs to reduce copper input into stormwater ponds. 4) Investigate new methodologies for controlling water pollution. Objective 4—Monitor archaeological sites within the Clam Bay NRPA This objective is focused on recognizing the presence and importance of archeological sites within the Clam Bay NRPA. A. Monitor conditions of known archaeological sites. 1) Review historical records of Florida Division of Historical Resources(DHR)on known archaeological sites. 2) Inspect known archaeological sites periodically. . _ 3) Report findings as appropriate to DHR. B. Implement strategies for the protection of archaeological sites as needed. Objective 5—Ensure recreational activities are environmentally compatible within the Clam Bay NRPA This objective is focused on recognizing recreational uses,ensuring that public use facilities are maintained,monitoring associated impacts to the estuary,and promoting public awareness and stewardship of this sensitive area. A. Monitor access and the condition of the facilities for recreational uses. 1) Report vegetation needing to be trimmed to the responsible entity. 2) Report litter needing to be removed to the responsible entity. 3) Report facilities needing to be repaired or replaced to the responsible entity. B. Maintain existing canoe trail. I) Inspect signage periodically. 2) Repair or replace trail marker signage as needed. 3) Repair or replace caution seagrass and shoaling signs as needed. 4) Revise and/or reprint the Canoe Trail Guide as needed. C. Maintain existing signage for safe swimmer and boater usage. 1) Inspect signage periodically. 2) Repair or replace signage as needed. D. Monitor use of facilities/area for recreational uses. 1) Encourage citizens to report unsafe or environmentally harmful use. 2) Coordinate with responsible entity to enforce the laws and regulations as needed. 41 Agenda Item#6b-2 Page 4 of 4 CLAM BAY NRPA MANAGEMENT PLAN Pelican Bay Services Division October 2014 Ver.6.5 3) Continue to support the use of the Clam Bay NRPA for low-impact recreational uses. E. Maintain materials to educate visitors about the unique features of the Clam Bay NRPA. I) Inspect educational signage periodically. 2) Report signage needing repair or replacement to the responsible entity. 3) Update Clam Bay Guide as needed. Reporting Regular reports will be prepared at least annually,summarizing the data collection and management activities. Reports will evaluate datasets by comparing results to baseline conditions(if known)or through trending analysis. Additionally, reports will recommend whether any intervention strategies or actions are necessary to meet the objectives. The goal and all objectives will be evaluated at least annually in conjunction with past and present research programs conducted within the Clam Bay NRPA to determine ecosystem status. If progress in achieving objectives is not favorable,then the methods will be re-evaluated and updated as needed. Alternative methodologies will be explored, if warranted,to achieve progress in meeting the goal of maintaining the health of the Clam Bay NRPA. 42 Agenda Item#6c-1 Page 1 of 8 HUMIS'I')N &MOORE ,6r9 stand r.x,n ENGINEERS Naples,n 31110 ' 239 594 2021 Wire ' k`q, COASTAL 239-594 2075 Fou INGMEENMG S+titii man PI ounnson WORK ORDER/PURCHASE ORDERSp__ CONTRACII 13-6164 July 8,2016 Humiston & Moore Engineers(H&M) is pleased to provide this scope of work to Collier County via the Pelican Bays Services Division(Peso). The purpose of this scope is to outine professional services to be provided to the P85D for services related to the Hydraulic monitoring for Clam Bay in accordance with the Clam Bay NRPA management Plan. The implementation of the NRPA management plan includes various monitoring to maintain the health of the eco system. The hydraulic monitoring includes continuous water level and tidal data collection at 4 locations within the bay system.This work order is set specifically for the following tasks; Collection and analysis of tidal monitoring data and providing monthly updates to PBSD on hydraulic monitoring parameters as set in the Clam Bay NRPA management Plan. Budget Engineering services as referenced above will be billed monthly on a time and materials basis in accordance with the fee schedule and conditions of Contract Number 13064. For budgeting purposes we estimate that our services will not exceed$11,000. These services do not Include preparation of the annual monitoring report which will be induded under separate work order for the annual reports for physical and hydraulic monitoring. Compensation for the above scope of work will be based on charges as described In Exhibit "A" and will not exceed the total amount listed without written approval from PBSD, Deliverable: Monthly updates on hydraulic monitoring parameters including phase lag and ratios of tidal ranges to guff tide at the tide gage 4 locations within the system. Total amount for Work Order.._._.__... .....„.....,...».....� 20110 Mohamed A.Dsbees,P.E.Vice-President [sate Humiston&Moore Engineers c. tt>to Ni41idin 17 Ti1.-044111144141 Agenda Item#6c-1 Page 2 of 8 g g i �S 'I.. Ii i re Pik Li i ix I ' i ,„ n.11 . i. ��. ,.-, - i k li 0 Pi Pi II I. t. 4 I 2 I E 8 1p � �v ii Agenda Item#6c-1 Page 3 of 8 MUMISTON El' R 8 4AJ Y Stand Court I NGINER r 31I e0 239�lri 4 [1CI i-Voice COASTAL ill14WEE#FEe ocsw+r 14111.1 119 Y3,4-2CCI,5-fox me outwit** WORKOPOBV N lima*1341164 June 07,2016 lltrrttiasort b rrioc ra Fneineers is pleased to prtwide a • ,k• +,,W of • cost for pole ccroslru*on towiloring at the 2010 Clem ,• , Project scope of wort includes Fe'surveys of lie channel baihlrmtetry and • : * - and k - . , of survey reside and morphology in an*mud , The t reooit wi phadtal and Arial monitoring of the corn an ot the pass farm survey end rePorls are a wider Section 5.0 R 2.of the :;•• . . i *PA Msnagusnunt Plan. Yee recommend a budget of$45,500 liar Me mtonilo.iig . . - . • hydrographic end lopeanteldc monthly oblique aerials, data , • - :Lion , and preoaration of lie annual monitoring report Coda for*wee activaies + as A Stains Updates may include not , rneeeng preparation and presentations. ki •�. `t... as required, aerialmonthly , any a Ammot . ' . . to Iiiincludede acid p m>onilort g $19,950 +de .. of the puss poet Budget 25,550 Taw Budget: $45.500 • services as r ', a.. ,. we be billed monthly on a time and materials basis in ••, + the fere - and ccxaditians of Contract Number 134164.Compensation for the above ••t be , on charges as described in vire Exhibit`A'and vnot esceed the total a listed ♦ from M Task A alliin: - updates will be provided regtdarly thrutigleout the year,and when requested by the boar&Deamnibies may consist of written memos,electronic copies of presentations m e to the board.or**zit copies of aerial photographs. Tads S DdevrMenoble: Annual rnoneuriryj report in digital Ptd format including tidal and ptty it al monitor'ing to be completed 60 days after 11*1-year post osnstruction survey. Mohamed AP.E.Vkae4aresi ant Dane Hurniston&Moore Engineers votterksoor_umnssuen SOW telt,Nitratiarr OirAitt cF Agenda Item#6c-1 Page 4 of 8 _ I 2 1 .. a - .. .4... ... P 1 .... ,, ,_, ,.... 4., ...I. .. .... r. ;;;.. . , . ... r. . ,,,,„ g ; ail.. X .71.t St 4 64-1 . " I , . 2 St 2 a ... 1 ,,,, 4.40., 4,4 t4 r... .. V' . §. i 1+1 2 ..: Y tit if .,,,, ...,.....,. ... . to r4 P14 .4 -4 0 i 6 6 U z i .§. i 1 14r i P•4 .2 2 V 2 ! Hk Z 1 1 21 rt 1 2 . 1 111111111 E ••• ,41 , 4 ...... 8 % " (-4 AO 4 r r . 0 .. 114* .4 0.. 4., tE 40k A "4" t.... n z sa ii cs 114.+49. $4 at. Ai4 I 1 U a j 4:4 j i , it ir u fol 1 2 1 Cli. Q. .b. ' aP a r IC 1 X X i 1 1-7-. E u s ..... 40 t )- (.4 2 E 1 I 1 1 Ig . 4. E U CLAM BAY NRPA MANA69111015t-i8AN Pelican Bay Services Division ktober 2014 Vcr. 6.5 5.0 Clam Pass Dredging A. Dredging Policy There are two circumstances that could necessitate dredging Clam Pass. I. Clam Pass closes or is in imminent danger of closure following a weather driven event. In this situation the inlet should he dredged as soon as possible. 2. The inlet has lost hydraulic efficiency and is jeopardizing the long-tenn health of floral and faunal communities of the Clam Bay NRPA. The scope and timing of any proposed dredging activity will bc determined by reviewing and comparing current and past hydraulic. hathymetric and ecological monitoring da a. In both cases the PBS F) Board would,after consultation with and advice from qualified coastal engineers and biologists, approve and recommend an appropriate set of construction drawings fir the dredging event to the 13CC for its approval prior to the submittal to the regulatory agencies. Dredging will only be done for the health of the Clam Bay NR PA, not for navigation or beach renourishmeni Beach-compatible sand removed as part of the dredging event will be spread on adjacent arca beaches,as required by the permitting agencies. B. Hydraudic sad Bathyinetric 1)redging Criteria The purpose of regular hydraulic and physical monitoring is to evaluate inlet characteristics on a comprehensive long term basis with less emphasis on short term or seasonal changes. To monitor the stability of Clam Pass,data on the variables listed below will be regularly collected and reviewed by qualified engineers. If data are not within the identified target ranges for the variables. further monitoring and/or intervention will be considered in conjunction with current ecological data. Set Appendix S for additional information on the dredging criteria. 1. Bay Tide Range I idal range data have been collected annually since, 1999 and will continue to be collected and reported to the consulting engineer at least quarterly. tuannual tidal analysis report will Ix: included with the annual report. Data arc collected from gauges at four locations(Clam Pass Park Boardwalk, Pelican Bay South Boardwalk, Pelican Ra North Boardwalk,and Upper Clam Bay). These gauges provide a record of the tidal range within Clam Ray and are one indication of the tidal prism or volume of water flowing through Clam Pass at each tidal cycle. 43 CI-4141 RAY NRPA MANAttrOVAWIT8AN ge 6 o Pelican Bay Services Division October 2014 Ver.63 Rased on an analysis of data from the gauges at the South Boardwalk and(lain Pato Park Itoardwalk from 1998 to the present when the inlet was hydraulically stable.the ratio between Clam Bay and Gulf tide was between and 0.7 over 90%ot the time. therefore, if the ratio between(lam Kay and the iulf tide falls below OIL but abovc 0.5.further mortitorin. will be considered once it has been established that other types of blockage are not causing theres21Litta. 11 the tidal range ratio falls below ‘0.5, physical monitoring of,or interventions to,potential shoaling areas that could be impedinE flow will be considered. 2. Cross Section of Flow Area and Volum of Shoaled Material Annual bathymetric surveys and reports were completed from 1999 to 2008. Bathymetric surveys provide data on the physical conditions of the inlet channel,ebb shoal and flood shoal. Post-dredging bathymetric surveys and reports were completed at 3-month.6-month,and 12-month intervals following the opening of('lain Pass in April 2013. Be innin.! in 2014 bath metric surveys and reports will be issued at least annually. Additional surveys will be considered if the hydraulic „gfliciencv falls below target levels. o establish benchmarks or targets for flow area and ()fume of shoaled materials,the data analysis imitated evaluation of the flow cross-section areas in the three main sections of the dredging region. 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. Section C *et Sed KM A 4,01 -atama Figure 20, Seetitou A, ft and C' 4(lima Pass The analysis included evaluation of the cross-section of flow between mean high water and the volume ol 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 44 CLAM BAY NRPA MANA4`Pf iI 6P1 4N Pelican Ray Services Division October 2014 Ver. 6.5 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 200k when inlet conditions were near equilibrium 24 months and 16 months, respectively. following dredging events. Targets for the average cross-section of flow areas below MHA,': Section A greater than 300 sq. ft. Section B greater than 450 sq. ft. Section C greater than 450 sq. ft. Targets for the minimum cross-swam of flow areas below MI IW: Section A greater than 250 sq. ft, Section B greater than 350 sq. ft. .Section C greater than 35(1 sq. ft. Targets for volume of shoaled materials: Section A less than 3000 cu. yds. Section B less than 2500 cu. yds. Section C l ss 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 or intervention may be needed. 3. Inlet Channel Length The channel length is an important factor in inlet stability. 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. °u establish a benchmark for channel length a selection of aerial photos of Clam Pass from 2004 to 2013 was 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 inlet channel is to stay under 400 feet in length. Inlet channel length will be recorded at least annualland included in the annual report. 4. Ehh Shoal The size and shape of the ebb shoal is a key factor to the stability of the inlet that. in turn, supports the stability of Clam Pass. The ebb shoal helps to keep the inlet open when facing stoups and big wave events. The ebb shoal provides sheltering to the channel and a sand bypass pathway around the inlet without filling in the Past. The shape and volume of the ebb shoal are additional indicators of the stability of the inlet. 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. 45 (LAM BAY NRPA MANAOESINP:PAAN Pelican Bay ServicesUivision October 2014 Ver. 6.5 To determine a target for the ebb shoal delta,data from April 2013 to April 2014 were reviewed. The ebb shoal position offshore is measured from a line connecting the north and south channel banks at mean high water out to the-4.0 foot contour line. The recommended length of the seaward extent of the ebb shoal is at least than 250 feet. the ebb shoal distance from shore will be recorded at least annually and included in the annual report. A summary of criteria for dredging is presented in the table below. Dredging Criteria Parameter Sand y Location Target 1.)c-script ion Bay Tidy Kale Kano >4.6 ratio comparison of the interior and Gulf teal ranges A Average 300 sq R Not less than 230 sq ft (.mss Sectional Ara g A .-450 sq ft area in different locations of the Pass _Not tesx.than 350 s9 ft through which Mater rata lbw A C , verage--450 sq R Nut less than 350 sq f A3000 cu ?' quantity of sand and sediments within Volume of Shoaled Materiel 11 2500 cuyds donne'that can restrict flow 4000 ca yds Inlet Channel Length 400 kct distance water roust flaw through the beams and ebb shoal arra, Ebb Shoal 250 foot distantx from short to the outer ebb shoal Iasis C. icoliogical('oasiderattiom A critical consideration in all dredging decisions is to ensure the ecological health of the Clam Bay NRPA. Before any dredging event, the direct and indirect impacts on the flora and fauna of the NRt'A including mangroves,benthic communities(including ),and other important sped s,such as fish and birds, will be considered. Every effort will be made to minimize any ne Live impact to the flora and fauna. The pros and cons of dredging will be weighed in regards to both hydrologic and ecological consequences. D. Dredging Construction 1. Typical Craw-Sections for Dredging Typical cross-sections for the suggested dredge design are provided below. When dredging is deemed neccsary,the design cross-section area as stated in the design range, with consideration to existing conditions will be followed. Minor modifications to this dredging template may he needed for future permitting. Typical cross-sections arc shown for open areas in Sections B and C where the waterway 46 Agenda Item#6c-2 Page 1 of 4 CLAM BAY NRPA MANAGEMENT PLAN Pelican Bay Services Division October 2014 Ver. 6.5 5.0 Clam Pass Dredging A. Dredging Policy There are two circumstances that could necessitate dredging Clam Pass. 1. Clam Pass closes or is in imminent danger of closure following a weather driven event. In this situation the inlet should be dredged as soon as possible. 2. The inlet has lost hydraulic efficiency and is jeopardizing the long-term health of floral and faunal communities of the Clam Bay NRPA. The scope and timing of any proposed dredging activity will be determined by reviewing and comparing current and past hydraulic, bathymetric and ecological monitoring data. In both cases the PBSD Board would, after consultation with and advice from qualified coastal engineers and biologists, approve and recommend an appropriate set of construction drawings for the dredging event to the BCC for its approval prior to the submittal to the regulatory agencies. Dredging will only be done for the health of the Clam Bay NRPA,not for navigation or beach renourishment. Beach-compatible sand removed as part of the dredging event will be spread on adjacent area beaches, as required by the permitting agencies. B. Hydraulic and Bathymetric Dredging Criteria The purpose of regular hydraulic and physical monitoring is to evaluate inlet characteristics on a comprehensive long term basis with less emphasis on short term or seasonal changes. To monitor the stability of Clam Pass, data on the variables listed below will be regularly collected and reviewed by qualified engineers. If data are not within the identified target ranges for the variables, further monitoring and/or intervention will be considered in conjunction with current ecological data. See Appendix 5 for additional information on the dredging criteria. 1. Bay Tide Range Tidal range data have been collected annually since 1999 and will continue to be collected and reported to the consulting engineer at least quarterly. An annual tidal analysis report will be included with the annual report. Data are collected from gauges at four locations (Clam Pass Park Boardwalk, Pelican Bay South Boardwalk,Pelican Bay North Boardwalk, and Upper Clam Bay). These gauges provide a record of the tidal range within Clam Bay and are one indication of the tidal prism or volume of water flowing through Clam Pass at each tidal cycle. 43 Agenda Item#6c-2 Page 2 of 4 CLAM BA YNRPA MANAGEMENT PLAN Pelican Bay Services Division October 2014 Ver. 6.5 Based on an analysis of data from the gauges at the South Boardwalk and Clam Pass Park Boardwalk from 1998 to the present when the inlet was hydraulically stable,the ratio between Clam Bay and Gulf tide was between 0.6 and 0.7 over 90%of the time. Therefore, if the ratio between Clam Bay and the Gulf tide falls below 0.6, but above 0.5, further monitoring will be considered once it has been established that other types of blockage are not causing the problem. If the tidal range ratio falls below 0.5,physical monitoring of, or interventions to,potential shoaling areas that could be impeding flow will be considered. 2. Cross Section of Flow Area and Volume of Shoaled Material Annual bathymetric surveys and reports were completed from 1999 to 2008. Bathymetric surveys provide data on the physical conditions of the inlet channel,ebb shoal and flood shoal. 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. Beginning in 2014,bathymetric surveys and reports will be issued at least annually. Additional surveys will be considered if the hydraulic efficiency falls below target levels. To establish benchmarks or targets for flow area and volume of shoaled materials,the data analysis included evaluation of the flow cross-section areas in the three main sections of the dredging region. 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. ,. I Section C :1?-;.,- 4 i %-,...,, Vit. 'n'll,74,,:i,‘;',,. ,,„ ' ' ; .7, x ,*,,,Ts::: Section A ' *::0 �1 400 1.E , � Figure 20:Sections A,B and C of Clam Pass 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 44 Agenda Item#6c-2 Page 3 of 4 CLAM BAY NRPA MANAGEMENT PLAN Pelican Bay Services Division October 2014 Ver. 6.5 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 dredging events. Targets for the average cross-section of flow areas below MHW: Section A greater than 300 sq. ft. Section B greater than 450 sq. ft. Section C greater than 450 sq. ft. Targets for the minimum cross-section of flow areas below MHW: Section A greater than 250 sq. ft. Section B greater than 350 sq. ft. Section C greater than 350 sq. ft. 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 or intervention may be needed. 3. Inlet Channel Length The channel length is an important factor in inlet stability. 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 was 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 inlet channel is to stay under 400 feet in length. Inlet channel length will be recorded at least annually and included in the annual report. 4. Ebb Shoal The size and shape of the ebb shoal is a key factor to the stability of the inlet that, in turn, 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 provides sheltering to the channel and a 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. 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. 45 Agenda Item#6c-2 Page 4 of 4 CLAM BAY NRPA MANAGEMENT PLAN Pelican Bay Services Division October 2014 Ver. 6.5 To determine a target for the ebb shoal delta,data from April 2013 to April 2014 were reviewed. The ebb shoal position offshore is measured from a line connecting the north and south channel banks at mean high water out to the-4.0 foot contour line. The recommended length of the seaward extent of the ebb shoal is at least than 250 feet. The ebb shoal distance from shore will be recorded at least annually and included in the annual report. A summary of criteria for dredging is presented in the table below. Dredging Criteria Parameter Summary Location Target Description >0.6 ratio comparison of the interior and Gulf Bay Tide Range Ratio tidal ranges A Average>300 sq ft Not less than 250 sq ft Cross Sectional Area g Average>450 sq ft area in different locations of the Pass Not less than 350 sq ft through which water can flow C Average>450 sq ft Not less than 350 sq ft A <3000 cu yds Volume of Shoaled Material B <2500 cu yds quantity of sand and sediments within C <4000 cu yds channel that can restrict flow Inlet Channel Length <400 feet distance water must flow through the beach and ebb shoal areas Ebb Shoal >250 feet distance from shore to the outer ebb shoal limits C. Ecological Considerations A critical consideration in all dredging decisions is to ensure the ecological health of the Clam Bay NRPA. Before any dredging event,the direct and indirect impacts on the flora and fauna of the NRPA including mangroves, benthic communities(including seagrass), and other important species, such as fish and birds,will be considered. Every effort will be made to minimize any negative impact to the flora and fauna. The pros and cons of dredging will be weighed in regards to both hydrologic and ecological consequences. D. Dredging Construction 1. Typical Cross-Sections for Dredging Typical cross-sections for the suggested dredge design are provided below. When dredging is deemed necessary, the design cross-section area as stated in the design range,with consideration to existing conditions,will be followed. Minor modifications to this dredging template may be needed for future permitting. Typical cross-sections are shown for open areas in Sections B and C where the waterway 46 Agenda Item#6f Page 1 of 1 " ; ;'.-, ii , fi " ,,,,,....,,,,,.,- :,,,,io. ,:.,...-_, :,..: •., ,,,,,Ni,.. ..,. . . ...,.._..,-,,,.,t,, itx--• 3. - 4i,„:1;...,. , " ` R ',- .- •• ' ,- •:-r-:------i•-I -•- :At:vtiii.,, ,..-•-•.-•-,,.., if' k -i d'i i --- --- •-- ' ■k WC • + Itl 3 ....„,... ill fi- « j wI"' K # E - ' ---4. ''''' ''''''''. ''' ' ' - .:—.4„--.4- r-e . �,, a r„ a .. -xi ii.iiiiiiiiiiiii-••i: li **-•-iii..•••• i.-....-„,t.iiiii--iiipi,..si•-i• •iiirliiiiiiii,*•-i-'ii..iiii••iii: i;„.4, i '-,- viii---11,* •1 0 y . . rn , . 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S C '�+,g NI PM* wY 'n'-' ;ojY-.�r ne ssc �, • Y.f - i K,,saloN sa .razs�uo� 34j PIp \auN„�Se SP a +. t 1: P aqo•■ a” ` w axo ® sEw qo■ ■ s ausa ' Of amo " f Y, '-'� � w• w! aaa€ P .._ ,,-,-7.,-,;,-....:4(.4.,,-.,,,,.T... ,,,,t, w 0tv.� oq �s momma �vd • P ta `5 - P qoU■s ' ;a''7)..2;-'7, `' R`k >* ,,..•,-1,.1.1„:!:_i.:.,: UPm °mom� a 7■'p-P 90 aJ .'� �n - x'�e -6, ' IIMILMINIII jtti rilir .,P � ■ P tiadssgo0 ❑ s'^'� `s�$ 1P ��qM �s. by" sled wep punoae °^'` i V `� io,(e we a ai anaas o a uen eune ''''''°21-310(114 P 0 v asa o uo!s.:naxa tpynn ituapi of nnolaq sy devhotoyd ayt asn Py P 90■ 4 lP a �j x, y rM tab` , a� P ..� r g .� �ik" ?, ii + lF�SL•7. EEE £.: r rry azi3�n 4,£° r ,,.�.�k, .� ,Ab8 WelD Welcome to the Clam Bay canoe trail. Trial markers begin at the Foundation public canoe ramp,adjaceNaples Gf2 in Upper Clamthe Bay. The rande FoundationResort makes andnish canoat es#3availablent toto Pelican Bay residents/guests along the north boardwalk at marker#26. Obtain life jackets and paddles from the security guard at Tram Station#6 at the startof the north boardwalk Equipment is available from 8:00 am to noonand I:00 pmto 5:00 pm. All equipment must be returned by 6:00 pm. „„• ,ll„--A., This brochure has been designed as a trail map and brief ° field guide for the mangrove estuary We hope you enjoy your trip and come back again! CLAM BAY Canoe Please take note of the safety information below before .,�. - <�<, you set out... , is INFORMATIVE GUIDE • Do not stand up in the canoe!On entering,steady the canoe with hands on either side and place yourt_r '�•„,-,,,„,77."' a weight in the middle. ,° 4.,,:,,,x...44., •2,,,,--,...:: r3S F > • Everyone should haveaiife jacket board and ' s children must wear them at times. ` s • Don't forget water,sunstreen and bug spray.Take a .6. "�" cell phone if you have one. - p • Almost the entire bay system is shallow enough to stand in the canoe tips Be aware that the . substrate Is often soft mud, -u u.. �. • tIt can be pdifficult paddling against the wind across flowsacan be st on trip es ec all close tto Cla Idal F '" u g P Y m Pass. ". f..: • Feeding or he any wildlife is prohibited. - • Please be aware that alligators are present in Clam For more.r`or rxrat rr oMSFt Bay waters. • Watch out for sPr hers overhead in the creeks.The PE car day isce,D,,.„. _ crab-like spiny orb weaver has a bite but Is not 1 dangerous. 8011 a el Oa.r U i\c Suite 605 • Follow the trail markers and check the map to Nlnl ,'L 32yI determine where you are. It's hard to get lost in i.or e [239)5 37-f 749 Clam Bay but please remember-don't leave the pass into the Gulf of Mexico;even a light chop can Pe car 9 iso Fcundat:on flip a canoe quickly. f`or c.�ce"n or-oat.cn1 • Have Fun! t232, ,,/88 i l: CLAM BAY ' ':. w,e.-:. '_"4.'-., -1,-,,,,,, ...).., , ,„,,,,,,,.„:.:4,:.,.,,,,,;,..,:::::?,,, :„„:„Ii.,,,i.,;, "\,,,,,,4.). p � n oCa u i a NFORMA TIVE GUIDE f44%.—H".:::,..4.....i.":".4.,,,..,1- x � s` Thic 570 ac'e e:tuai y rystem was deeded to Collie-Cour;y by tFe developer in the yr �.' sa" .� late 80's,and together with the County,the Pelican Bay Services Division oversees its #` < se 42 k health. Every year reports are prepared assessing the healthof the system including:a ,...-#.4...',-4,1 bathymetnc monitoring report,water quality report,and a biological\ecological report r.,,,,,„44, ' li xr4. _ a- ti34- '; r N - c.. a�"sr-i t"7 ` 44 - ' :-'1.---111.,'..!'-::::,..,..:'!„---:',.':',',-..ii....1',I.,...t.:: . . ,,,,,,14-40,.#,....,..0",..3.''''''' '4:;:'''':. ''''. .:„,,, '''',,,,', it ya - "' * .szo-w:xx estvvh' ,` ' s.., .v"",$`?� zk - ."r`a *' Three species of these salt tolerant trees arefound in coastal Florida Mangroves protect the coast from storms and erosion,provide rich feeding ground and nursery areas for mance 'm Is and are the starting point in highly productive estuarine ecosystems. Because of heir importance they area legally protected species. *` . The red mangrove (Rhizophora mangle) grows closest to the Lr a a waterways and has a tangle of „�".' tt P e f x { supporting prop roots,shiny dark green leaves and distinctive r Aa t a �( propagules(seeds). ) d rbc gsu':t'. i �t'. ,. Black mangroves(Avicennla germinans)have leaves withsilverey y .. ,'flg e '- undersides,straight trunks and pnematophores,which arelike ` underground snorkels sucking in air to cope with the low oxygen ,R< ' .. .,t... soil. = '.4 White mangroves (Lagunct lana racemose) possess slightly i rounded,pale green leaves with characteristic nodules on the stem 'tr s t}p� ` that excrete salt.Also associated with mangrove lig S ha, systems s the buttonwood(Conocarpus erectus)in dryer areas. -.1.;'7.-..i.;;7:4:-.77:::;1)41,:r-ii. 3� f © "' `Submerged open areas of mud and sant 's-Ir the channel south of Clam Pass sea " are common in estuaries and are often grasses bind the substrate and provide a �, �k f: = marked at low tide ,. rich, productive `0 a by wading birdsLL' a. and safe nursery •'•'=t „M'" .��. pickingthrough the • c„ '` A area for young \• -` 0 rich invertebrate c m marine animals �' inhabitants. , �, Three important - > Shellfish crawl on - p rk ,p§ species are ya a - the surface or lie buried within the mud, found in the Clam Bay system:Shoal Grass z„'. poking outtheirsiphonstofilterseawaterfor (Halodule wrightt)with small,flat strap-like �'. food and oxygen. Worms build protective leaves;Turtle grass (Thalassia testudinam) ta tubes and filter small food particles or crawl with large strap-like leaves,found in deeper T ., 0 ' through the sediment hunting for even water; and (Halophile decipiens) with ' smaller creatures to eat. Look out for. $, �, (} �.4'' *> paired oval leaves.These fragile and Ilght • Florida fighting conch dependent true grasses are sensit ve to ` MudsnaiIs on the.surface " water quality and physical disturbance.All a ��,r -° : rtrc ` Shells of the tellin or angel wing, boat traffic must stay close to the marked Sir t- ' buried in the mud trail.Florida's once abundant grass meadows gvq. a "` w r • Parchment tube(a white papery . have been badly impacted by prop scarring ,, II 4 11 tube) and degraded water quality.Please also try (? �.oE w,,,<.L.<.‘,1:*.,"'RSand mason worms (tiny pieces not to wade in the grass areas, � "•"'•``"""°'"`"'"" `-'LLLfi ''''' of cemented sand)peeking out of w...a�..a...m... ..' u t, the surface riot.«My iaiwrnt '+ r e. ` 1 '."7.7.:::,.., ... • ,. " � ��//lie .,m""° � �• Mel e are 31 total came:-ail rr�a<ers. n." t em E ,� x' u c m The distance from Marker#Ito Clam Pass is approximately I mile(one way). 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