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Agenda 12/19/2016 PELICAN BAY SERVICES DIVISION Municipal Service Taxing and Benefit Unit NOTICE OF PUBLIC MEETING DECEMBER 19, 2016 THE CLAM BAY COMMITTEE OF THE PELICAN BAY SERVICES DIVISION WILL MEET AT 1 :00 PM ON MONDAY, DECEMBER 19 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 11/09/16 meeting minutes 4. Audience comments 5. 2016 annual reports 6. Mangrove die-off a. THA November report and December observations b. H & M November tidal ratio data c. Water level logger data d. Elevation of surface water in Clam Bay e. Exhibits of hand-dug channels f. Conservation easement near the Strand and property line, set- back and as built plans for Bay Colony Drive and retaining wall g. Minutes from April 2002 committee meeting re: original mangrove die-off h. Intervention strategies 7. Clam Bay monitoring in 2017 a. Recommended changes to 2016 monitoring b. Additional monitoring of mangrove plots in die-off area c. Bathymetric survey of interconnecting waterway between Inner and Upper Bays d. Water quality monitoring i. Two or four reports on TN & TP ii. Using Dr. Tomasko for TN & TP reporting iii. Soliciting quotes for WQ monitoring 8. Next meeting: February 2, 2017 9. 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. 12/05/2016 9:43 AM PELICAN BAY SERVICES DIVISION CLAM BAY COMMITTEE MEETING NOVEMBER 9,2016 The Clam Bay Committee of the Pelican Bay Services Division met on Wednesday,November 9 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 (absent) 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 Mary Johnson, Pelican Bay Foundation Mike Shepherd, PBSD Board Arielle Poulos, Turrell, Hall, &Associates Jeremy Sterk, Earth Tech Brandon Reed, County Legislative Affairs Dave Trecker, PBSD Board APPROVED AGENDA (AS PRESENTED) 1. Roll call 2. Agenda approval 3. Approval of 09/28/16 meeting minutes 4. Audience comments 5. Mangrove die-off a. THA October report b. Observations from new mangrove monitoring plots in die-off area c. H&M tidal ratio data for October d. Set-back information on retaining wall along Bay Colony Road e. Hand-dug channels f. Intervention strategies 6. Clam Bay monitoring, work, and reports a. Tree trimming and exotic treatment in FY17 b. 2016 annual report c. Aerial photos of Clam Bay 7. Water quality a. Copper data for August b. Tomasko quarterly report on TP and TN for May, June, and July c. Phosphorus levels in Clam Bay 8. Florida Fish and Wildlife Commission and manatee protection in Clam Bay 9. Next meeting: December 19, 20, 21, or 22 10. Adjournment 1 Pelican Bay Services Division Clam Bay Committee Meeting November 9, 2016 ROLL CALL Mr. Ventress was absent and a quorum was established AGENDA APPROVAL Mr. Hirniak motioned, Ms. O'Brien seconded to approve the agenda as presented. The motion carried unanimously. APPROVAL OF 09/28/16 MEETING MINUTES Mr. Hirniak motioned, Ms. O'Brien seconded to approve the 09/28/16 meeting minutes as amended. The motion carried unanimously. AUDIENCE COMMENTS None MANGROVE DIE-OFF THA OCTOBER REPORTS Ms. O'Brien reported that the THA October report estimated that the mangrove die-off area has remained about the same. Ms. O'Brien reported observing significant stagnant water in the northern die-off area adjacent to Upper Clam Bay, on Friday Nov. 4. She observed no apparent drainage. OBSERVATIONS FROM NEW MANGROVE MONITORING PLOTS IN DIE-OF AREA Mr. Sterk commented that his observations show that the mangrove mortality appears to be almost 100% white mangroves with evidence of new red mangrove growth. He suggested letting the "natural progression" continue of red mangroves replacing white mangroves. H&M TIDAL RATIO DATA FOR OCTOBER Ms. O'Brien commented that the H&M tidal data shows slightly better ratios from the prior month. SET-BACK INFORMATION ON RETAINING WALL ALONG BAY COLONY ROAD Mr. Dorrill reported that based on our engineer's review of property lines and easements on or adjacent to Bay Colony Drive, PBSD has no roadway drainage easements in this area. Mr. Dorrill summarized that Ms. Jacob will provide the following Bay Colony Drive information at the next committee meeting: (1) final inspection reports, (2) one year warranty inspection report, and (3) clarification of access easements for Bay Colony Drive. Mr. Jim Carr, Agnoli, Barber & Brundage, will assist as necessary. HAND-DUG CHANNELS Ms. O'Brien suggested the need to explore the reason for the stagnant water not flowing into Upper Clam Bay via the hand-dug channels, and the reason for the water in Upper Clam Bay 2 Pelican Bay Services Division Clam Bay Committee Meeting November 9,2016 not flowing south through the entire Clam Bay drainage system. She commented that Mr. Hall observed no blockages in the hand-dug channels in his last report. Ms. Mary Johnson expressed concern over the drainage channels not functioning properly. INTERVENTION STRATEGIES By consensus, the committee agreed on intervention strategies to include (1) Mr. Sterk will look at water level logger data as compared to last quarter, (2) THA will look at current water levels in hand-dug channels as compared to April 2016 data, and(3) staff will ask H&M to explore water level data provided by the four Clam Bay tidal gauges. Mr. Hirniak suggested exploring a"hydraulic profile" of the Clam Bay drainage system. CLAM BAY MONITORING,WORK,AND REPORTS TREE TRIMMING AND EXOTIC TREATMENT IN FY17 Ms. Jacob reported that the PBSD received proposals for FY17 annual exotic maintenance &treatment services for the East Berm, West Berm, and Clam Bay NRPA. The job will be awarded to Earth Tech as the lowest and most responsive bidder, resulting in savings of approximately $23,400 from FY16. Work will be performed quarterly on the east and west berms, and annually on the Clam Bay NRPA. 2016 ANNUAL REPORT Mr. Dorrill commented that consultant work products for the 2016 Annual Report are due on December 15. AERIAL PHOTOS OF CLAM BAY Ms. O'Brien commented on the excellent quality of the Clam Bay aerial photos provided by Humiston&Moore, which will continue to be taken on a monthly basis. WATER QUALITY COPPER DATA FOR AUGUST Ms. O'Brien commented on the copper data provided by the County Lab for August, which showed copper exceeding FDEP acceptable limits at one site (Clam Bay-9). This site will continue to be monitored as this"exceeds"level has been observed for two consecutive months. Mr. Dorrill commented on his Nov. 10 meeting with Commissioner-Elect Solis, and will discuss that there has been a significant reduction of 60-80% in copper levels in Clam Bay and in Pelican Bay upland lakes as a result of the elimination of the usage of copper sulfate in 2013. TOMASKO QUARTERLY REPORT ON TP AND TN FOR MAY,JUNE,AND JULY Ms. O'Brien commented that the 3rd Quarter Tomasko report shows additional problematic areas of"exceeds the criteria" of phosphorus concentrations in Clam Bay; the report suggests that nitrogen concentrations are not currently problematic. Dr. Trecker commented that the report suggests the source of the nutrients as being drainage from upland lakes. FLORIDA FISH AND WILDLIFE COMISSION AND MANATEE PROTECTION IN CLAM BAY 3 Pelican Bay Services Division Clam Bay Committee Meeting November 9, 2016 Ms. O'Brien commented that this issue was fully discussed at the November PBSD board meeting. Ms. Mary Johnson commented on next week's FWC appeal hearing on manatee protection in Clam Bay. NEXT MEETING: DECEMBER 19,20,21, OR 22 By consensus, the committee agreed that the next meeting of the committee would be held on December 19 at 1:00 p.m. The committee also agreed that future meetings, beginning in February 2017, would be held monthly on the Thursday following the PBSD board meeting. ADJOURNMENT IThe meeting was adjourned at 2:16 p.m. Susan O'Brien, Chairman Minutes approved [ ] as presented OR [ ] as amended ON [ ] date 4 Agenda Item#5 Page 1 of 71 ° CLAM BAY *ftarm � � MONITORING & MANAGEMENT ANNUAL '` MONITORING REPORT i PELICAN BAY 1� , NAPLES, FLORIDA • Prepared for. PELICAN BAY SERVICES DIVISION Municipal Service Taxing& Benefit Unit of Collier County •Tler Cit1tty 801 Laurel Oak Drive, Suite 302 Naples, FL 34108 doth Teed Environmental,LLC EARTH TECH ENVIRONMENTAL,LLC 1455 RAIL HEAD BOULEVARD STE.8,NAPLES,FL 34110 www.etenviron.com Agenda Item#5 Page 2 of 71 December 15, 2016 Lisa Jacob Pelican Bay Services Division Municipal Service Taxing& Benefit Unit of Collier County 801 Laurel Oak Drive, Suite 302 Naples, FL 34108 • RE: Clam Bay Annual Monitoring Report Dear Ms.Jacob, Earth Tech Environmental, LLC (ETE) is pleased to submit this Annual Monitoring Report for the Clam Bay. As requested,the report summarizes results of all monitoring activities conducted by ETE in 2016. Please feel free to contact us if you have any questions. Jeremy Sterk, CEP Earth Tech Environmental, LLC Agenda Item#5 Page 3 of 71 TABLE OF CONTENTS 1.0 INTRODUCTION 5 1.1 Purpose 5 1.2 Scope of Services 5 1.3 Limitations and Exceptions 5 1.4 User Reliance 6 2.0 SITE DESCRIPTION 6 2.2 Site and Vicinity General Characteristics 6 3.0 MANGROVE MONITORING 8 3.1 Monitoring Methodology 8 3.2 Results 10 3.2.1 Plot TH-I 10 3.2.2 Plot TH-2 I I 3.2.3 Plot TH-3 12 3.2.4 Plot TH-4 13 3.2.5 Plot TH-5 14 3.2.6 Plot TH-6 15 3.2.7 Plot TH-7 16 3.2.8 Plot TH-8 17 3.2.9 Plot TH-9 18 3.2.10 Plot TH-10 19 3.2.1 I Plot TH-1 1 20 3.2.12 Plot ETE-1 21 3.2.13 Plot ETE-2 22 3.2.14 Plot ETE-3 23 3.2.15 Plot ETE-4 24 3.2.16 Plot ETE-5 25 3.2.17 Plot ETE-6 26 3.2.18 Plot ETE-7 27 3.2.19 Plot ETE-8 28 3.2.20 Plot LE-3 29 3.2.21 Plot LE-4 30 4.0 COASTAL SCRUB MONITORING 31 4.1 Monitoring Methodology 31 4.2 Results 33 4.2.1 MONITORING PLOT I 33 4.2.2 MONITORING PLOT 2 34 4.2.3 MONITORING PLOT 3 35 4.2.4 MONITORING PLOT 4 36 Agenda Item#5 Page 4of71 5.0 SEAGRASS MONITORING 37 5.I Monitoring Methodology 37 5.2 Results 38 5.2.1 Transect I 39 5.2.2 Transect 2 40 5.2.3 Transect 3 41 5.2.4 Transect 4 42 5.2.5 Transect 5 43 5.2.6 Transect 6 43 5.2.6 Sea Grass Summary 44 5.2.7 Benthic Observations 45 6.0 PROTECTED SPECIES MONITORING 46 6.1 Monitoring Methodology 46 6.2 Results 47 7.0 EXOTIC& NUISANCE VEGETATION MONITORING 51 7.1 Monitoring Methodology 51 7.2 Results 51 8.0 WATER LEVEL MONITORING 53 8.1 Monitoring Methodology 53 8.2 Results 53 9.0 HAND DUG CHANNEL MONITORING 57 9.1 Monitoring Methodology 57 9.2 Results 58 10.0 RECREATIONAL FACILITIES MONITORING 63 10.1 Monitoring Methodology 63 10.2 Results 63 11.0 ARCHAEOLOGICAL SITES MONITORING 67 1 1.1 Monitoring Methodology 67 11.2 Results 67 12.0 SUMMARY 69 13.0 REFERENCES 71 Agenda Item#5 Page 5 of 71 1.0 INTRODUCTION Earth Tech Environmental, LLC (ETE) conducted ongoing and annual monitoring within the Clam Bay estuary(Subject Property) located in Naples, Collier County. The Subject Property is located west of U.S. 4 I, south of Vanderbilt Beach Road, and north of Pine Ridge Road (Figure 1). It is bordered on the west by the Gulf of Mexico and the east by the Pelican Bay residential community. . SITE LOCATION l f TALLAHASSEE -«' .., • JACKSONVILLE :a a^� .;,, it SITE LOCATION N \ :. , - , , a ._ ,- .,,,,41..,-1 A"... f, -,, .-,. . i Wa�� 9tTM AVE N-t . ORLANDO MY {� ...e. FSi AMEN `�� • I � ,),,,.................. '0,)04 c ARWATER ? E `ePETER38URG� y�AA y .tIT GNtof •I . b& 4s tr ri\ pi 1,,il i g +./f ..______ ,,,, ,,,,,,,_...„2-7:„..; ‘....-, FIGURE I. Location Map 1.1 Purpose The purpose of this report is to provide a summary of results from annual biological monitoring events as outlined in the approved Clam Bay management plan. 1.2 Scope of Services This annual report summarizes fieldwork conducted by ETE included, but was not limited to,the following services: • monitoring of plot within mangrove habitat • monitoring of plots within coastal scrub habitat • mapping and monitoring of sea grass habitat in clam bay • protected species monitoring • exotic and nuisance vegetation monitoring • installation and monitoring of three (3) water level loggers • inspection and mapping of hand dug channels _ • recreational facilities mapping& monitoring • archaeological sites monitoring 1.3 Limitations and Exceptions This report is expressly for the sole and exclusive use of the party for whom this report was originally prepared for a particular purpose. Only the party for whom this report was originally prepared and/or other specifically named 5 Agenda Item#5 Page 6 of 71 parties have the right to make use of and rely upon this report. Reuse of this report or any portion thereof for other than its intended purpose, or if modified, or if used by third parties, shall be at the user's sole risk. ETE warrants that the findings contained in this report have been prepared in general conformance with accepted professional practices at the time of report preparation as applied by similar professionals. Future changes in standards, practices, or regulations cannot be anticipated and have not been addressed. The observations and recommendations presented in this report are time dependent and the findings presented in this report apply solely to site conditions existing at the time when the assessment was performed. 1.4 User Reliance This sampling report was conducted for the use of and is certified to the following parties: Pelican Bay Services Division Municipal Service Taxing& Benefit Unit of Collier County 801 Laurel Oak Drive, Suite 302 Naples, FL 34108 2.0 SITE DESCRIPTION This section presents a general overview of the Subject Property and a description of surrounding properties. 2.1 Location The Clam Bay estuarine system is located in northwest Collier County, bordered on the north and east by the Pelican Bay community. The Seagate and Naples Cay communities form its southern borders. (Figures 1 & 2). 2.2 Site and Vicinity General Characteristics The aerial site map shown in (Figure 2) highlights the Clam Bay Natural Resource Protection Area (NRPA) and the surrounding communities. NRPA: 506-acre estuarine system dominated by mangrove habitat. Includes shallow open water bays, gulf beaches, coastal dunes, and shoals. Connected to the Gulf of Mexico by Clam Pass. Vicinity: Predominately bordered by single family and multi-family residential uses; Pelican Bay, Seagate, Naples Cay. Commercial (hotel) uses are found at the north and south ends of the system;the Ritz Carlton & Naples Grande. 6 Agenda Item#5 Page 7 of 71 io Ch1, :" Teue„� ,� 1 +4 ',� ' � iI °, sr`=%o6 4 ... ryas 4 44.DOw 444.44 ' .- .. ‘,2., rug, iOAK t4 *- '. r,a t 4 a li ,"...... ti r.,.., , - - , ..=..r.= ; : ' ,. . � }.. a.. � c 4 :::::: =FIICAN BAY _R. PINE;RIDGE' . ,fi- A*2.k.--t �% ,@ " ') ...."41 I '"" -., t.:ALA_.er . -.. �: z • d' f.� 2.l 04 f ,. ..4 R, wYyaRr f1 to o- tic di ( 1 " 1 ,"'.• Ars. - --.1 qs, , Clam Pass` ._ �}� „ !'{ • • FI ^ ... t 7.1 flit€ "s ' , �!►�- IA's•'•. :6F .fY"� .�,.. 3,200 \ Outer '•,_ '" . lit ..•;4.,..,ti,,, ..6 4 i 1 W cdt'* .. Bay a .e:7 1".r .,a ,+ . 11 - i.i...1.t CLAM BAY NRPA _ �:LJ1T;.-thy` �„�� ,b x_g� A $ SEAGATE �� ,» ` FIGURE 2.Aerial Site&Vicinity Map 7 Nem Agenda Item#5 Page 8of71 3.0 MANGROVE MONITORING This section describes the fieldwork conducted in conjunction with annual mangrove monitoring in the Clam Bay estuary. 3.1 Monitoring Methodology Mangrove monitoring plots were previously established in the Clam Bay estuary by Turrell, Hall &Associates (THA). This sampling event was established to replicate the prior mangrove monitoring to the greatest extent possible. Prior monitoring events tracked data from eleven (I I) THA plots and eight (8) original Lewis mangrove plots. Because of mangrove die-off areas that were discovered last year, it was determined that new mangrove plots should be established within the die-off areas to track their status. A total of eight (8) new mangrove plots were established within several of the die-off areas. Additionally, ETE continued to track data from two (2) previously established Lewis plots. The THA and ETE plots are I 0 meter x I 0 meter squares. Each corner is staked with PVC pipe to mark the limits of the plot. At each plot, all trees with a diameter at breast height (dbh) greater than 2.5 cm are tagged with a tree number. Each tagged tree is identified by species, measured (dbh), and assessed for health. Saplings smaller than 2.5 cm dbh are identified by species and an approximate percent coverage estimated for the plot. Photographs are taken at each plot and any other notable observations are recorded such as mortality, water levels, wildlife, and signs of stress. Signs of stress would include leaf loss, wilting, signs of excessive insect infestation, or the presence of galls. See (Table I) & (Figure 3) for methodologies and locations of each plot. Plots Established By Number of Plots Methodology Turrell, Hall &Associates (THA) I I I Om x I Om plot w/species,sizes, &counts Earth Tech Environmental (ETE) 8 I Om x I Om plot w/species, sizes,&counts Lewis 2 plot w/species&counts Total Plots: 2I TABLE I. Mangrove Plot Types Prior monitoring reports included quarterly panoramas taken from the roof tops of two condominium buildings. The recent mangrove die-offs prompted the PBSD to have monthly photos taken of clam pass and the clam bay estuary. THA was tasked by the PBSD with monitoring the mangrove die-off areas and providing these photographs. See monthly summaries provided by THA for photographs and specific discussions regarding the mangrove die-off areas. 8 Agenda Item#5 Page 9 of 71 [ r3 r. + ti ,sem +.+ ,. V\ c' atGtt3�F °K1Jr ,g ' r ' r dA ' -4 `Y ` ler y i + 41 1.)4;*• ,�„ i • • c4.4� Il'0 tOlt4'* -4461*'' . ' ' ',1 ' *' ' f M .,..."r4t'''' i SIM; ' 4- a. ..1.1'404. '-'''7"7,46'4 lt. ' x 4, A� 1.j* s - ", .' . ..k.‘7,2*11-' .,:* 1,:TA.1 .9-•::. �' d • .." �� oo �{ „ 0 GD WO a w��a p ,s ' A , , . y7 iii' G MANGROVE MONITORING PLOTS(2016t h, � P i � � MANGROVEDIE-OFFAREAS(10116y .Aill ,y; 9 �'• r " \�-ft't7 t(r• t f FIGURE 3. Mangrove Monitoring Plot Locations 9 Agenda Item#5 Page 10of71 3.2 Results The following pages provide a summary of the 21 monitoring plots. For each plot, a tree composition graph, photograph, and discussion has been provided. 3.2.1 Plot TH-I TH 1 16 14 14 12 CU i./..j I— 10 > c8 02.5-5.Ocm 01 -cl 6 L''5.1-10.Ocm E Z 4 >10cm 4 2 2 2 , 1 1 € ,g, isi0 0 0 Red Black White Species Discussion: , , . Plot TH-1 is the southernmost plot; located northeast of .. ,or,- . ,ttli 5, 4 ,>a *' :. the Clam Pass boardwalk. Plot composition for ._ It,'«,"art,'•. `..,.,4. ,,tal measureable trees (>2.5 cm dbh)year-to-year is identical R.s ;7 ;' ,, y. ,r �t,, ;,,,t,"1.; to last year. The plot has shown further recruitment of ., , : :,1.,,. '`:y' »� . , .' �. + saplings in the ground cover predominatelyred `1`' `° 4",- a� " ` �'- `'''j'' '. i.!3 i mangroves. The canopy is still dominated by a mix of i,i -, ,,, - "; 1:s.,,,,,;. ' h' ' , red and white mangroves. Mid-story is dominated by red ;•, ,,r_ , .4t ,,, • •,, mangroves in the 2.5 to 5.0 cm range. y s i. A ' ti 4 4 10 Agenda Item#5 Page 11 of 71 3.2.2 Plot TH-2 TH-2 30 25 v 25 v it 20 J 0 15 •2.5-5.0cm Q5 10 •5.1-10.Ocm E 10 8 Z 6 •>10cm 5 0 L 3 4 i . ._. II ° Red Black White Species Discussion: t';,,,',,,,,' .}' t,�. ; ,i ! _'; Y ` Plot TH-2 is located just south of theis,y.. t' . 1 °�� r i�°� �; southern Pelican Bay boardwalk, on the ,#^0i .'› _° � "', m, = , _`'�,` � 5 a ' ;� east side of the system directly east of '?` , , '. . R, ' T N, t . Clam Pass. Plot composition for �` • x r measureable trees (>2.5 cm dbh) year- ' rI ' to-year is nearly identical to last year. The plot has shown further recruitment of " - -i. - 4 ' saplings in the ground cover — / ` i predominately red mangroves. The ' ' canopy is still dominated by a mix of red Y r and white mangroves. Mid-story is ; it ,i,. dominated by red mangroves in the 2.5 to " : �p 5.0 cm range. The overall condition of r.' this plot is good, showing signs of �' : '` ` �� continued recruitment and little stress. i s 11 Agenda Item#5 Page 12 of 71 3.2.3 Plot TH-3 TH-3 45 39 40 37 m 35 d 2 L 1- 30 a > .J 25 :2.5-5.Ocm L 20 5.1-10.0 cm Z 15 >10cm 9 10 4 5 0 1 0 0 0 III LOAM0 Red Black White Species ‘" ` f. 7 t,,,.` ' Discussion: '� + +$ a "= xe "' t t Plot TH-3 is located approximately , ' �;1' t,i_ k ,'� ,, ls4 .!tb halfway between Clam Pass and Inner _ + � 1a' 111-. 4 fri4 Clam Bay,just east of the tidal canal. Plot 4, ' i, ' 'tt ),` 0. w composition for measureable trees (>2.5 'i'_ .,,,a _, _, ,F cm dbh) year-to-year is similar to last '<• 1..,,',•' y . * .q.#, \ , : , year, with five (5) red mangroves and 1; �. +' four (4) white mangroves reaching the \\ I • k-: y" 2.5 cm size threshold. We did identify a f -4•., . few more stressed red mangroves from : /ry " 1.;'',' ' 1"` r , 1 last year. The canopy is still dominated i 14;>: by a mix of red and white mangroves. "y Mid-story is dominated by red and white . ill„u �.�, -- ` , 'X° mangroves in the 2.5 to 5.0 cm range. '�”' . ._ s ' eh Overall condition of this plot is good with .',�. i heavy seedling recruitment in the w 9. .-_ 'F . 1 ' - . ; groundcover. - 12 Agenda Item#5 Page 13 of 71 3.2.4 Plot TH-4 TH-4 8 7 7 v CU 6 H d 5 J 4- ° 4 .2.5-5.0cm au E 3 5.1-10.0cm z 2 2 2 >10cm 1 1 o 1 0 0 0 0 ` 0 Red Black White Species Discussion: Plot TH-4 is located to the west of .�`� ""; ' 1 � �c� ;" 1 .5' the tram berm on the southeast side of Inner Clam Bay. THA indicated that the marker for this • " plot was lost in 2015. Data was ' provided to ETE for this plot. ETE , t."1 re-established the plot and .t installed new PVC markers. { Canopy is predominantly large white mangroves. Mid-story is generally absent, with no . "'' ." mangroves in the 2.5 to 5.0 cm range. Groundcover contains open areas mixed with red mangrove seedlings — densities of seedlings are approximately 20%. 13 Agenda Item#5 Page 14 of 71 3.2.5 Plot TH-5 TH-5 20 18 18 ai 16 al L H 14 a, J 12 0 10 9 .2.5-5.0cm L a, -0 8 115.1-10 cm E 2 6 •>10cm 42 2 1 0 0 0 0 0 Red Black White Species Discussion: K, , tier 1 ., fq *, 4 ,:, Plot TH-5 is located approximately mid- . ,,4 7.7.4,,—,144:44- way up Inner Clam Bay on the western -7"--..., `( -,...-A2),.(.4* .*'' i ,,,,,,.:.2.‘,... side of the bay. There are a few more •, lsu. `' ,' x > `.: ° - ' . , stressed red and black mangroves „ ,.� l$ ,.....-i . i' :,- _ compared to last year.The canopy is still ;F ,ps.Li. , , . :,...f.,,,......-1,..:.. �. dominated by black mangroves, but in . ' / ') � ,,• , .'V., � 4 ';' f the next few years the red mangroves ,. ll f '' ` .� .4 could start to compete for canopy , _` ,,. , dominance. Mid-story is dominated by .. . t ; ` , : 4' .: red mangroves in the 2.5 to 5.0 cm range. • _. . ` . .. • • ��,, ' . s' 2016 data for red mangroves was - • 1 ' ,.- substantially different than last year. ETEr, +.,,;.. ., ✓ :y ..„ counted seven (7) numbered red t°1 ,-' „� +�, .✓ }" / mangroves between 5.1 cm & 10.0 cm i " dbh that were not included in the 2015 • �� data. Additionally, eight (8) trees that . , . ol , were alive in 2015 were found to be _ t"..- i -u dead this year, which amounts to ' approximately 17% mortality in measured trees. Most of the deceased trees were red mangroves less than 5.1 cm dbh. 14 Agenda Item#5 Page 15 of 71 3.2.6 Plot TH-6 TH-6 9 8 8 4.1 II! 7 6 I— C) 6 O▪ 5 4 .2.5-5.Ocm v 4 xi E• 3lo 5.1 10.0 cm Z 2 a>10 cm 2 1• 1 1 0 0 0 0 Red Black White Species Discussion: . 'a �f' . ' 'a 'VC . ' �. t v. �. • Plot TH-6 is located on the west side of t 4 . f . t the tidal canal, north of Inner Cam Bay. f : c ' ' '" ` . Y b� r r urinated i \'',•1` a al - i` I. fi''' • , .' 4 . . . l �4 :, The canopy and mid-story are do .i , y�.� � •� �\ -.:1'44%,,, ;• ,, by a mix of red, black, and white t1kt s , 1 , , 1 � • ; ; mangroves in the 2.5 to 5.0 cm size range. `, '. � ' r ,/ . - . ` 'z ' Ten (10) trees that were alive in 2015 1f were found to be dead this year, which I ;1 \ /� +1� amounts to approximately 27% mortality ;y ` 1 ./11')14:4 .,- " i in measured trees. The deceased trees ,its' • • `. `fit . .. � x i , were a mix of red and white mangroves ,� , • less than 5.1 cm dbh. ri i -`�a . k k 3,k\ _ .e ,,, - \ 15 Agenda Item#5 Page 16 of 71 3.2.7 Plot TH-7 TH-7 6 5 a 5 a 4 1— a) a 4 > J 4- ° 3 .2.5-5.0cm a E 2 2 .5.1-10.0 cm E 3 2 z1 i., a>10 cm 1 1 0 0 0 0 0 Red Black White Species Discussion: ; ,;s; „ �: # ¢# -. '.'4`;:::4-!: F t1, ; i ' Plot TH-7 is located on the eastern side .� �, , 'i ,'' it, _ ,`', of the tidal canal approximately halfway , . ' 'j ' f ' 'y' between Inner and Upper Clam Bay. " f' *,. �;" fr The canopy is still dominated by black f mangroves. Mid-story is dominated by red mangroves in the 2.5 to 5.0 cm range. • - ' } ' A handful of 5.1 to 10 cm black - : ' mangroves from 2015 proved to be "� 4,. outside of the plot, hence a decrease in their numbers from 2015. Six (6) trees ,, , , ( that were alive in 2015 were found to be A - � � � , '• '� 'Ii� (41 , dead this year, which amounts to - 1=t ' l r approximately 21% mortality in J ,_ measured trees. Most of the deceased trees were red mangroves less than 5.1 N \, -/ , .> ; cm dbh. - . 16 Agenda Item#5 Page 17 of 71 3.2.8 Plot TH-8 TH-8 50 46 45 d 40 Gl 35 d n• 30 • 25 •2.5-5.Ocm E 20 3 a 5.1-10.0cm • 15 13 >10 cm 10 5O 0 2 2 0 1 0 0 Red Black White Species `ItDiscussion: � y r '4 f Plot TH-8 is located just west of the • ' . southern most portion of Upper Clam «4 v •° 'a4` , iitt� Bay. White mangroves are still the 1/4 c' '� � ! " dominant species on this plot, with red • �. A �iA ''' cik� � � ' •' '' mangroves beginning to reach the mid- ; t story level. ETE tagged ten (I 0) new , t'>? � • white mangroves that reached the 2.5 cm '- . j ) � '' ; ` ? k . size threshold. Three (3) trees (2 red, I white) that were alive in 2015 were , � + found to be dead this year, which y •• t { ; amounts to approximately 4% mortalityk k �}' ,� ` . in measured trees. Red and black �` _ t ' mangrove seedlings are continuing to , • ;< , recruit in this plot. I � ��• 4— • ‘ 17 Agenda Item#5 Page 18 of 71 3.2.9 Plot TH-9 TH-9 3 0 a) 2 2 H a 2 J o •2.5-5.0cm L cri -0 1 1 1ill 1 5.1-10.0 cm E zi 1111>io cm 0 0 0 I 0 0 0 Red Black White Species Discussion: g ,•':�:; ' ' A ° : ` ;> •' * Plot TH 9 is located just west of the ° `• ° r:7, ,.,,,, «, t.';', ' . 4't 4i berm near the southern end of Upper u =° " . $ ,y " . ' �, PP �� ,� , �� &,��:` k� z#`ter"s �� '�, ,,'' :**44 6' ,R Clam Bay. This plot has struggled due to 64,:..:7.-„,,, « past Brazilian pepper infestations and % '445.1,''.1'.;,,,°,4 s . 17,- . associated treatments. Heavy ground - . :�. t cover has limited new seedling growth. 4 ,. .- ' i 0,— r ,. k, . ,; Maintenance activities should be ongoing ' ., 7i; ` , : • t`ea mi'''' '' , "'' S �, � . in order to ensure the plot will fully ,, _4`_ "'. •. .1. ,-'c ` t.• ,',,`'f"'>, ' , . ,I' rebound. Improvements are expected .. _.:,,i ' , 'Y .� ',1 and should be observed and ' t' `'- documented over the next few '.f cw ,. _ �� monitoringperiods. Two (2)trees (both 1. ' ' ' ,i t` ' i`"' ', f '1, ' ,j white) that were alive in 2015 were � �,,: •,,� +�„ � - - , "'�Vlo{ t found to be dead this year, which " ►'""l.,. "�,`,»,: ,-� >�;. f fr , '• amounts to approximately 28% mortality '. �; - ,,.. . "4 "-! �, in measured trees. ,, r `t``. `' t �> + i !Y ' 18 Agenda Item#5 Page 19 of 71 3.2.10 Plot TH-10 TH-10 25 23 y 20 I' a I 14 15 o .2.5-5.Ocm v .c 10 •5.1 10.0 cm 3 6 Z •>10 cm 5 3 2 11111 M 1 0 0 0 0 Red Black White Species Discussion: , ;' , ,, J ;� 4: ft Plot TH-I 0 is located on the extreme + t '' " f' `, ` ' northwest side of Upper Clam Bay, just a 1\,' " 1 �t ,, east of Bay Colony Road. White �' �,'' r �I ' } i' d 11 / • ' mangroves dominate this plot. Twenty- . r It=. =I. -i.4 ,,, ; ,i, lir, three (23) trees that were alive in 2015 "��4.. . . ' , were found to be dead this year, which ‘ f A i 1 `1 � ' a a • • f amounts to approximately 35% mortality 1 . in measured trees. The deceased trees ,• ' `1' ,,, were nearly all white mangroves<5.1 cm �� ti =' �»f s- '` °h - dbh. In addition, a further 23% of the remaining trees were classified as 11 ..,�w • stressed. During the past few monitoring , ' •, periods, water levels have been higher , - »_ e t than usual, which may be causing white `'.. t tr mangrove mortality. Some red - e. mangrove seedlings are recruiting in the '', rt r:,. '*x . groundcover (10 — 15%). The plot will '� ` t need to be closely observed and • documented during the next few monitoring periods. 19 Agenda Item#5 Page 20 of 71 3.2.1 I Plot TH-I I TH-11 14 12 12 ifia ° t`— 10 9 CU Zi .- 8 r 3 ° X2.5-5.0cm E 6 4 5.1-10.0 cm Z 4 PIO 1 >10cm 2 1 1 '.v 0 Red Black White Species Discussion: r ••. • v r Plot TH-1 I is located just west of the t�' I «,•';,,o1 ` ' ' '• :� .t..7.!'' r" `��t�K' s, ' :loll/074,. tram berm and north of the southern •`R ,:'i" t ' ' ; t 4 .: -` - '' Pelican Bay Boardwalk. This plot remains t; . °kg'1 v 5. relatively unchanged from the last • �'.� ',' ''. '4 ' , , ., ' monitoring period. White mangroves of 1'' • v 1. �` varying dbh dominate the mid-story and ` t f'` ' . � groundcover. Two (2) trees (both �,,,,t. � a�t �i white) that were alive in 2015 were i s I i� ! found to be dead this year, which is , 4 ' approximately 8% mortality in measured ,0,� �4 z, '$ trees. `• - ,4.t , 20 Agenda Item#5 Page 21 of 71 3.2.12 Plot ETE-1 ETE-1 19 20 18 v 16 v H 14 12 10 10 X2.5-5.0cm 8 6 6 •5.1-10.0 cm Z 4 a>10cm 2 I 0 0 / 0 0 0 0 Red Black White Species STRESSED MANGROVES BY SPECIES ■Red •Black White ed :% Black 46% r -:: 1 (, (.1(.' Y`t 'i ' !;t ! I t y rt 5 Discussion: Plot ETE-I is located just west of the southern end of Upper Clam Bay. This is a new plot established in 2016 and is in a THA mapped mangrove die-off area. The canopy and mid-story are dominated by a mix of white and black mangroves, but all are young trees less than 5.1 cm dbh. Dead mangroves within this plot are predominately white mangroves less than 5.1 cm dbh. Among remaining trees, approximately 59% were identified as showing some signs of stress. The stressed trees were an equal mix of white and black mangroves. 21 Agenda Item#5 Page 22 of 71 3.2.13 Plot ETE-2 ETE-2 16 14 14 v 2 12 H > 10 8 112.5-5.O cm rj 6 4 5.1-10.0 cm Z 4 2 >10 cm 2 1 0 0 0 0 0 0 Red Black White Species STRESSED MANGROVES BY SPECIES •Red ■Black White 'ed ,% Black 28% f. / it: 1 „ 11114,4 : Discussion: Plot ETE-2 is located west of Upper Clam Bay in a mangrove die-off area. The plot is dominated by white mangroves in the 2.5 to 5.0 cm range. Dead mangroves within this plot are predominately white mangroves less than 5.1 cm dbh. Among remaining trees, approximately 86% were identified as showing some signs of stress. The stressed trees were predominately white mangroves less than 5.I cm dbh. 22 Agenda Item#5 Page 23 of 71 3.2.14 Plot ETE-3 ETE-3 6 5 v 5 d q 3 X2.5-5.Ocm 0 2 E 5.1-10.0 cm 1 0 0 0 0 0 0 0 0 >10 cm 0 Red Black White Species STRESSED MANGROVES BY SPECIES Red ■Black White White 100% & •p oma. i s 11 1 t 1 aF a� �, '�, �i : -4 1, 1 P _ Discussion: Plot ETE-3 is located just east of Bay Colony. The plot is situated in a THA mapped die-off area and contains only five(5) living white mangroves in the 2.5—5.0 cm range. Dead mangroves within this plot are predominately white mangroves less than 5.I cm dbh. Among remaining trees, 100%were identified as showing some signs of stress. 23 Agenda Item#5 Page 24 of 71 3.2.15 Plot ETE-4 ETE-4 5 4 4 I al 4 ar i- 01 a 3 X2.5-5.Ocm d z 1 1 II5.1-10.0 cm s 1 3 0 o o o 0 ®>10cm Z 0 MI Red Black White Species STRESSED MANGROVES BY SPECIES ®Red ■Black White White 100% .y ,f,4 1 .A ' t 11'''I'4.1"4 et' .;,;!°"%.!'l ,41'4%' ,-' ; ' % ... ' ,:''') II .„ 44, te.,!A. ., a` � , { ' 1,. 1 '' '''# ' I, At 1: 16"; - . !t 1 " 1ai 1 t . Discussion: Plot ETE-4 is located just east of Bay Colony, approximately midway up Upper Clam Bay on the western side of the bay. It is in a THA mapped die-off area and is dominated by white mangroves all less than I 0 cm dbh. Dead mangroves within this plot are predominately white mangroves less than 5.I cm dbh. Among remaining trees, approximately 60%were identified as showing some signs of stress, all white mangroves. 24 Agenda Item#5 Page 25 of 71 3.2.16 Plot ETE-5 ETE-5 3 U 2 a .2.5-5.0cm Zr) 1 5.1-10.0cm >10cm Z 0 0 0 0 0 0 0 0 0 Red Black White Species STRESSED MANGROVES BY SPECIES ■Red ■Black White N �r White 100% ;r F ( "A � j 'e } t ` ,;.. I.� jt i r 1 f ,��` 1s�Y3 t # ' t > Glc, '� f t � "tom '< 1. , Discussion: Plot ETE-5 is located just west of Upper Clam Bay, approximately midway up the bay. It is in a THA mapped die-off area and contains just two living white mangroves, both less than 5 cm dbh. Dead mangroves within this plot are predominately white and black mangroves less than I0 cm dbh. Within remaining trees, 100% were identified as showing some signs of stress, all white mangroves. 25 Agenda Item#5 Page 26 of 71 3.2.17 Plot ETE-6 ETE-6 7 6 6 6 N v 5 CU 4 .2.5-5.Ocm 3 2 2 .5.1-10.Ocm v 1 1 1 .n E1insi0 0 0 •®>10cm Z II0 Red Black White Species STRESSED MANGROVES BY SPECIES ■Red ■Black White Red 73%i ,0‘4 ,..„,...... 1-., . 0.,,. 44,,,,, ,aTitoi ,$1,, i 6 ...., k...`.4) ao4,.. o,:i.41. l CI 7 t 1 f ` X t ° I`A t: rt ,;t 1 . 4 : w� s f �, ' iitt' 4 z u. Discussion: Plot ETE-6 is located east of Bay Colony,midway up Upper Clam Bay on the western end. It is in a THA mapped die-off area and is dominated by red and white mangroves. Dead mangroves within this plot are predominately white and red mangroves less than 5.I cm dbh. Among remaining trees, approximately 88%were identified as showing some signs of stress. The stressed trees were predominately (73%) red mangroves between 5.I and 10.0 cm dbh. 26 Agenda Item#5 Page 27 of 71 3.2.18 Plot ETE-7 ETE-7 3 2 2 2 2 .2.5-5.0 cm 1 1 a 1 5.1-10.Ocm Zm>10 cm 0 0 0 0 0 Red Black White Species STRESSED MANGORVES BY SPECIES •Red ■Black -White /" --- /` Red 28% Black 29% 9� ,r. T,(4,4\`‘ , - •' 1./ {j�f. \"Xf Y', fir' 4:1 pt • v%" S t r i r t P { r t l Discussion: Plot ETE-7 is located between Bay Colony and the northern end of Upper Clam Bay. It is in a THA mapped die-off area and is dominated by a mix of red, black, and white mangroves. Dead mangroves within this plot are predominately white mangroves less than 5.0 cm dbh. Within remaining trees, approximately 88% were identified as showing some signs of stress. The stressed trees were predominately (43%) white mangroves between less than 5.0 cm dbh. 27 Agenda Item#5 Page 28 of 71 3.2.19 Plot ETE-8 ETE-8 12 10 d 10 L O tu w 6 .2.5-5.Ocm 0 iv 4 .5.1-10.0 cm Z2 1 1 n>10cm 0El 0 , 0 0 0 0 0 s: Red Black White Species STRESSED MANGROVES BY SPECIES ■Red IN Black r White Black Red 50% 50% �'S .fii`t H.f a e x I A i s ! ,+` '+ ,�i y 'ti r, ' . t.,,,,,., - , ..ii,-A 4,,t 'i•ii ii„ , ..• ,—k..... ° -% f ...k. i % s'e:,....,,,, .,t i, „ ', .„ ‘, ,.; , t.:.,„,-, ii ' ,, 7.:.k..,,,!:-.,,$ ,,, iir.-...- ,.., ,-... ,„ -.:•,,,; -• __Awfo.,.!.,' if*4,....- . s.,f3/ , :•141.$ =it';,, ;14 lop."'i. =.44,1r43'‘, , ii5• 2 ! g" y,0 Y ' I. t1 Mt.:"r cam: . ,:....i,..,,......, .... ..4......,.. ., ; ..i. .,...., ...cr ...:4,f,.*:'0..2%; A';•.*'. ', -,kt ,..'.4, r „.,,H.'.3/404 tk.,, ' ",,,,-, ". $,I 'r4,41,% ':1'4 ''' "44.1t .31'43'1 ' ' - . ''' -' ' ' '* 41,g" 4 n-44 ..'; ,,,;"1,41 a .,r ` -T tom% _ "' . t Discussion: Plot ETE-8 is located just east of Bay Colony Road at the northwestern end of Upper Clam Bay. It is in a THA mapped die-off area and is dominated by red mangroves all less than 5 cm dbh. Dead mangroves within this plot are predominately white mangroves less than 5.0 cm dbh. Among remaining trees,approximately 17%were identified as showing some signs of stress. The stressed trees were an even mix of red and black mangroves. 28 Agenda Item#5 Page 29 of 71 3.2.20 Plot LE-3 LE-3 350 297 v 300 it 250 237 a) a. 200 15 CU 150 la 3 100 2 50 26 0 Red Black White Species 1ti y , 1� , l • . I ! � ! 1 L '. i , If ! � �..6 ' 1 t �� ` >, f \, ; / , 1 //////jjjjjj Discussion: Plot LE-3 is located towards the southern end of Bay Colony and west of the southern-most end of Upper Clam Bay. White mangroves dominate the plot, with red mangroves documented in abundance. Counts were substantially different for all three species of mangroves, which must be attributed to some difference in count methodology. Groundcover is dominated by red mangrove seedlings. Based on the simple count methodology of the Lewis plots and the overall health of these areas, our recommendation would be to abandon this plot and establish a new plot using methodology that matches THA& ETE plots. 29 Agenda Item#5 Page 30 of 71 _ - __ 3.2.21 Plot LE-4 LE-4 250 226 a) 200 > 150 ,—'F, 107 0 y 100 _0 57 E z 50 0 ■ Red Black White Species 'f Rl! }i v-�- / , . .... .,....,,.1,-.- t .l4- {s . .� " Ifo x t; it, �' J Discussion: Plot LE-4 is located at the southern-most end of Bay Colony. Counts were substantially different for all three species of mangroves, which must be attributed to some difference in count methodology. Groundcover is dominated by red mangrove seedlings. Based on the simple count methodology of the Lewis plots and the overall health of these areas, our recommendation would be to abandon this plot and establish a new plot using methodology that matches THA & ETE plots. 30 Agenda Item#5 Page 31 of 71 4.0 COASTAL SCRUB MONITORING This section describes the fieldwork conducted in conjunction with coastal scrub monitoring. 4.1 Monitoring Methodology This task is new for this year so ETE established the monitoring methodology for the coastal scrub habitat. Vegetation monitoring within the coastal scrub habitat included quantitative vegetative sampling along a single transect with four (4) sampling plots. At each plot, percentage cover for herbaceous, mid-story, and canopy vegetation by species was recorded. Percent cover of nuisance and exotic species was also recorded. Results are summarized in a single table for each plot to allow tracking of species changes over subsequent monitoring events. (Figure 4) shows the location of the four (4) monitoring plots, two (2) are located north of Clam Pass and two (2) are located south of Clam Pass. 31 Agenda Item#5 Page 32 of 71 f..."',...1, 1 "-• 46.- i= 4' !el - Itt 4,,,,. ft/4 .1 ' " -- - • •4•• to -• --;,,,-, -• s. 41 , • , ,....,,,, i s, 0 .. . 104'14"1 C.I.1049 '• ! # . ,. ,, •,.%, ' 41+, 4" , . .,..,, . ,.: ill Plot t '....„ s II1 ° . , . si „ - -.,., 6, 14,40,"1/4 • — - ..- . ,.., 44t.y.,, . . .T.• I • i ...er.7.4./.4 .,:. 3/4 .4., 4..'. •-•'-1..t s°'... 'I'rt C4'-;4).''' 4 K.i.' It.....,,,,, . ., 0 ,41,40'1. ' ,,,,,,.., - ._44.,L :, .,.. , ,i;• tA", '‘,,),..- , ' ,044"16 # iti,,, , , 1' i ',i''.--4 ,v.,; 4 Gulf at , 4 444X : .s': t g , . , . . . . C0::::,. k'T P...r: ... :,-At.-- . - .....„,.,. . 4 t .-- ,.,.,... „„ :t: ,•::. "..,:t• '''-'- 44/.1 '''''.--1-4. ,,,, i ,..:. ' •.:-.4....' 4; '''' * '.. . „ . - 4 44 -tt ,I ,.* , i--, - - %;. ni,;0; II-- 0 ,,,--% •4,-. ,,,:, i,40,'•1. -4 -,... 4 4„,„, .0-=4 , , ..., . i • ,. „Milfa NNI- '''' ''''' • ' t CLAM BAY NRPA BOUNDARY ,.. ! • ; B* . 11,.°)/1 - `'",'*, •, MONITORING PLOTS - : i ' - FLUCCS 322.COASTAL SCRUB' - ' air Cit.ip't'..' % '„,,,k,'. it . •• . L Buy k 4,.:‘,:fir it' 3*,0-4 60.0..''''''' S• S1/4 •.+4... t"'„..t.,,,•.41 . ''.0. ...' ' .."1.;* ' '', . ,. .f., .,..::.1.: .,. fl . — FIGURE 4.Coastal Scrub Monitoring Plots 32 Agenda Item#5 Page 33 of 71 4.2 Results The following tables summarize the results of coastal scrub monitoring in Clam Bay. See field notes for descriptions of vegetation species present at each plot. In general, scrub habitat at all plots was in good condition, except for the presence of exotic vegetation at various percentages. Scaevola taccada and Sphagneticola trilobata (wedeila) were the most commonly observed exotics. Removal of all exotic and nuisance species within the coastal scrub habitat is recommended to better manage these areas for gopher tortoise. 4.2.1 MONITORING PLOT I SPECIES OBSERVED % COVER FOR EACH MONITORING EVENT Scientific Name Common Name 2016 2017 2018 2019 PLOT 1 (S I) Canopy: Sabal palmetto Cabbage palm I 0 Coccoloba uvifera Sea grape 20 Mid: Scaevola taccada Beach naupaka 30 Caesalpinia bonduc Nicker bean 10 Sabal palmetto Cabbage palm 5 Coccoloba uvifera Sea grape 10 Ground: Uniola paniculata Sea oats 50. Panicum amarum Bitter panic grass 25 Duff/detritus 25 Field Notes: Plot#I is the northern most plot. Canopy vegetation in this plot is limited to cabbage palm and sea grape. Mid-story contains a significant amount of exotic vegetation,Scaevola(30%). Ground cover is dominated by sea oats. t 14, Panorama 1: November 9,2016 Facing East 33 Agenda Item#5 Page 34 of 71 4.2.2 MONITORING PLOT 2 SPECIES OBSERVED % COVER FOR EACH MONITORING Scientific Name Common Name 2016 2017 2018 2019EVENT Plot 2 (S2) Canopy: None Mid: Scaevola plumieri Inkberry 3 Scaevola taccada Beach naupaka 15 Conocarpus erectus Buttonwood 7 Coccoloba uvifera Sea grape I 0 Emodea littoralis Golden creeper 10 Ground: Uniola paniculata Sea oats 80 Euphorbia cyothophora Painted Leaf I Duff/detritus 18 Field Notes: Plot#2 is located roughly midway between Bay Colony and Clam Pass. Canopy vegetation in this plot is absent. Mid-story contains a significant amount of exotic vegetation, Scaevola (I 5%). Ground cover is dominated by sea oats. to 3 , • • , yr I { yis § p Y' y - a Panorama 2: November 9,2016 Facing East 34 Agenda Item#5 Page 35 of 71 4.2.3 MONITORING PLOT 3 SPECIES OBSERVED % COVER FOR EACH MONITORING EVENT Scientific Name Common Name 2016 2017 2018 2019 Plot 3 (S3) Canopy: Sabal palmetto Cabbage palm 2 Mid: Coccoloba uvifera Sea grape 70 Conocarpus erectus Buttonwood 2 Sabal palmetto Cabbage palm 2 Ground: Uniola paniculata Sea oats 60 Euphorbia cyathophora Painted Leaf Helianthus debilis Dune sunflower 5 Momordica charantia Balsam apple 2 Crotalaria rotundifolia Rabbit bells Asparagus aethiopicus Springer rye Duff/detritus 28 Field Notes: Plot#3 is located south of Clam Pass. Canopy vegetation is sparse, limited to widely scattered cabbage palm. Mid-story is dominated by sea grape. Ground cover is dominated by sea oats, but this plot had more diversity. • ' • • • Panorama 3: November 9,2016 Facing East 35 Agenda Item#5 Page 36 of 71 4.2.4 MONITORING PLOT 4 SPECIES OBSERVED % COVER FOR EACH MONITORING EVENT Scientific Name Common Name 2016 2017 2018 2019 Plot 4 (S4) Canopy: Avicennia germinans Black mangrove 20 Coccoloba uvifera Sea grape 30 Sabal palmetto Cabbage palm 2 Laguncularia racemosa White mangrove 20 Conocarpus erectus Buttonwood 10 Open 18 Mid: Coccoloba uvifera Sea grape 15 Caesalpinia bonduc Nicker bean 7 Sideroxylon alachuense Buckthorn 2 Rhizophora mangle Red mangrove 5 Heterotheca subaxillads Camphorweed I Ground: Uniola paniculata Sea oats 20 Sphagneticola trilobata Wedelia 70 Schinus terebinthifolia Brazilian pepper Helianthus debilis Dune sunflower I Spartina baked Sand cordgrass I Opuntia humifusa Prickly pear I Scaevola taccada Beach naupaka 2 Euphorbia cyathophora Painted Leaf Duff/detritus 2 Field Notes: Plot#4 is located south of the County beach facility. It is positioned at the eastern edge of the scrub habitat. Canopy vegetation contains a mix of species, including mangroves and sea grape. Mid-story is dominated by sea grape. Ground cover contains sea oats, but is dominated by wedelia. • A yz , m '14"• s . Panorama 4: November 9, 2016 Facing East 36 I Agenda Item#5 Page 37 of 71 5.0 SEAGRASS MONITORING This section describes the fieldwork conducted in conjunction with the sea grass monitoring and benthic survey for this report. 5.1 Monitoring Methodology Sea grass monitoring in Clam Bay was conducted in July of 2016. Due to the ephemeral nature of sea grasses in the estuary, ETE's monitoring methodology closely followed the methodology previously established by THA and consisted of the following steps: 1. Current aerial photographs of the Clam Bay estuary were examined for the presence of sea grass, especially in outer Clam Bay. Due to the limited water clarity in Clam Bay, aerial photographs cannot rule out sea grass presence, but they are very valuable in determining "target" areas to examine later in the field. 2. Traverse non-targeted areas by boat and by wading, especially at low tide to rule out portions of the estuary that do not contain sea grass. 3. Establish monitoring transects within the "targeted" areas. For 2016, a total of 6 monitoring transects were established throughout Outer Clam Bay. See (Figure 5) for specific locations of monitoring transects. 4. Establish stations along each transect to quantify the species of sea grass present and approximate percent coverage density. The number of stations varied depending on the length of the transect;the shortest transect had five (5) stations,the longest fifteen (I 5). 5. At each station,the percent cover of sea grass was noted. Any benthic species observed at each station was also noted. See (Figure 5) for specific locations of stations along each monitoring transect. 37 Agenda Item#5 Page 38 of 71 ,,f ¢. 0 �. , 00 „' . ,,,,, ` " o© TRANSECT#6 ,., , A' a© `�, 4. 43 Clam Pass OOD 4 sri �= f i O w "`b O r 0 izzamax130.0 0% TRANSECT#4 0Q0 • • O 'O '}.P ‘40, . m lift NI •4 o,, ff. ft . 0° TRANSECT#3 �'--..la " `iiir Apt \ ,'=" "� , , 11 TRANSECT#2 0 .�. : " Gulf rc Aga t� , ',:.,,,,, I..., Mexico 0�� 1y x, ` :: '24ali , eftir Y\t. u Outer ' t s �> A Clam >� Bay ' . ><e>tt ' 1 Rte' j TRANSECT#1 � - ! ��©Q © d � ... SEAGATE fr 0 �� 7,000 O O O O OD ;.. SURVEY TRANSECTS '. Notes: p°' 'w� SURVEY STATIONS r " 2016 Aerial provided by the Collier County Property Appraiser. r- Fieldwork conducted on July 21st&July 26th,2016. T .:a s�, r z x. • -.. -�T t FIGURE 5.Sea Grass Transects 5.2 Results The following pages summarize the results of sea grass and benthic monitoring in Clam Bay. 38 Agenda Item#5 Page 39 of 71 5.2.1 Transect Transect 1 16% 14% 12% 10% O v 8% z v 6% o' W mf .... 4% 2% 64 0/0 1 2 3 4 5 6 7 8 gi Percent Cover 0% 0% 10% 10% 15% 15% 10% 0% "gym -14 t $ gv 4 , fix_ Shoal grass (Halodule beaudettei) Discussion: Transect I was surveyed by boat and with snorkeling gear. Water depths varied from 2 to 4 feet. Visibility was approximately I foot. Shoal grass (Halodule beaudettei) was observed at stations 3 through 7. Densities at the monitoring stations were considerably lower than what was observed last year (0 to 60% in 20 15 vs. 0 to 15% in 2016). As in 2015, southern hard clams (Mercenaria campechiensis), lightning whelks (Busycon contrarium), and Florida fighting conchs (Strombus alatus) were also observed in the vicinity of this transect. 39 Agenda Item#5 Page 40of71 5.2.2 Transect 2 Transect 2 60% 50% cc 40% Wo 30% z w cc 20% w a 10% 0% 1 2 3 4 I:5)% 6',..: ®Percent Cover 35% 25°l0 0% 0% 50% '. a a � t - " . s a . . Shoal grass (Halodule beoudettei) Discussion: Transect 2 was surveyed by boat and wading. Water depths varied from 6 inches to 2 feet. Visibility was approximately I to 2 feet. Shoal grass (Halodule beaudettei) was observed at stations I, 2, 5, & 6. Densities at the monitoring stations were slightly higher than what was observed last year(I 0 to 40% in 20 15 vs. 25 to 50% in 2016). ETE identified two other small patches of seagrass in this area; both located to the east of the small bay and disjointed from the main area that was documented in 20 15. Other organisms observed: Southern hard clams (Mercenaria campechiensis), lightning whelks (Busycon contrarium), Florida fighting conchs (Strombus alatus), and upside down jellyfish (Cassiopeia xamanchana). 40 Agenda Item#5 Page 41 of 71 5.2.3 Transect 3 Transect 3 100% 90% 80% o cc 70/o �ws > 60% O o 50% r— w 40% (-) cc 30% ii 20% ,. ;,;.i 10% i IR 0 a 0% 3 14 7 $, 0 Percent Cover 0% 40% 50% 80% 90% 20% 0% 20% 4„„,,,,. . , , , ...„:::i ,., :ii.-_-_,.. .....mr...z .,- .:-,- ,::... . , . , , , Shoal grass(Halodule beaudettei) Discussion: Transect 3 was surveyed by boat and with snorkeling gear. Water depths varied from 6 inches to 3 feet. Visibility was approximately I to 2 feet. Shoal grass (Halodule beaudettei) was observed at stations 2, 3, 4, 5, 6, & 8. Densities at the monitoring stations were much higher than what was observed last year(20 to 90% •in 20 15 vs. 5 to 60% in 2016). Additionally, the overall patch size in this area was much larger effectively joining the two smaller patches that were documented last year. Several instances of turtle grass (Thalassic testudinum) were documented along the transect. The small patch along the western mangrove fringe,just south of the boardwalk is still present. Other organisms observed: lightning whelks (Busycon contrarium), Florida fighting conchs (Strombus alatus), and upside down jellyfish (Cassiopeia xamanchana). 41 Agenda Item#5 Page 42 of 71 5.2.4 Transect 4 Transect 4 45% 40% 35% cc 30% L>1 O 25% 20% LU cc 15% L.1 10% %0 1 2 3 4 5 ',Percent Cover 0% 30% 40% 5% 0% Shoal grass (Halodule beaudettei) Discussion: Transect 4 was surveyed by wading. Water depths varied from 0 to I inch(es) (low tide). Shoal grass (Halodule beaudettei) was observed at stations 2, 3 & 4. Densities at the monitoring stations were lower than what as observed last year(I 0 to 60% in 2015 vs. 5 to 40% in 2016). Overall patch size in this area waw s nearly identical to what was observed last year. N paddle grass was observed along the transect this year. Other organisms observed: lightning whelks (Busycon contrarium), Florida fighting conchs (Strombus alatus), blue crab (Callinectes sapidus), nine-armed sea star(Luidia senegalensis). 42 Agenda Item#5 Page 43 of 71 5.2.5 Transect 5 Transect 5 80% 70% 60% w 50% > O 0 40% z Lu 30% Lu o. 20% 10% A 0% ri', 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 D Percent Cover 50%40%400/030%20%35%25% 0% 20%75%75%20%15%25%15% 4:-'..4.1,6'-',4 • �- - x *,-i.,.,..0,,!;! Sa c 3 ,, a,` ii, L x�¢ , 444 "IlittL„,„ xx Fti �` { ! r m. ' tr v. • :;,$';',..-atirk,..i:;,,, r-p.- , $ -7 4 t tl h' t °'a "N 1* .„- ri...,-?,.-N ''4#1.1*.--' ( , '''''... - -.., .4,:,,..„ ,,,,,,,t,‘ ,,,z. „..,,,,4,,,,N,,,tz., , O.:...,/ ..,..,iitvi.:‘,,,,, ,..,,,,, ,,„,sdt .c., 4.x.,,, i ,:„:c ,..,,fi.,, . ji ft,,..,,,4? "''': '44i ,N, '..s., i?,„--;,.-5:7,.,',.";.,::,-...-, -,,,%.., *.,,,,,,„4,t,,,A,.,.,trzfAt_- 16Shoal grass (Halodule�beaudettei) Discussion: Transect 5 was surveyed by boat and with snorkeling gear. Water depths varied from I to 3 feet. Shoal grass (Halodule beaudettei) was observed at all stations, except number 8. Densities at the monitoring stations were very similar to those observed last year (10 to 80% in 2015 vs. 15 to 75% in 2016). Overall patch size in this area was nearly identical to what was observed last year. The eastern edge of this patch is defined by the north- south channel where deeper water precludes sea grass growth. Other organisms observed: lightning whelks (Busycon contrarium), Florida fighting conchs (Strombus alatus), and blue crab (Callinectes sapidus). 43 Agenda Item#5 Page 44 of 71 5.2.6 Transect 6 Transect 6 100% 90% a 80% 70% Ov 50% - E . r w 40% Lu 30% k? 20% 10% 0% 1 2 3 4 : 5 0 Percent Cover 80% 30% 90% 40% 70% A m °fie c'�: "�" m... z A 1, Discussion: Transect 6 was surveyed by wading. Water depths varied from exposed mud to I foot (at low tide). Shoal grass (Halodule beoudettei) was observed at all stations. Densities at the monitoring stations were greater than those observed last year (I 0 to 50% inn vs. 30 to 90% in 2016). Overall patch size in this area was slightly larger than what was observed last year. The westernedge of this patch is defined by the north south channel where deeper water precludes sea grass growth. Other organisms obseryed: lightning whelks (Busycon contrarium), Florida fighting conchs (Strom alatus), blue crab (Callinectes sapidus, and a nine armed sea star (Luidia se those 5.2.6 Sea Grass Summary The following map (Figure 6) summarizes the areal extent of sea grass coverage ETE observed in the clam bay estuary. Overall coverage in 2016 was 5.61 acres, up from 4.71 acres in 2015. This increase was despite dredging activities in April of 2016. Percent cover densities within the mapped sea grass areas was generally higher in 2016. Monitoring next year may give a better indication of any potential impacts or benefits from the Clam Pass dredging activities. 44 Agenda Item#5 Page 45 of 71 414, h s. 40-90%Coverage d �: 15-75%Coverage " , •7 ... Clam Pass � ... 10,,,,1014:10.,,,,ai,L . ;;rte . „. :,,, y 540%Coverages - ,- - st1/4 41v*- , . , , ... , ,, ,, . .., .,,. . -.,...,..„, , . \ .. :,..,,,,,,..„. ,.. ,,,, 10 - < . . . . 4,-.. \. . . , . -- - , . ,-„,...., ,,, • e-, x < .. 20-90%Coverage 25-50% - . , 4,...,) Coverage .� �. kyrr i GulfAge IP ac. of 3 Mexico , ,$$$L. . M r Outer { Clam t,, Bay M sirs. , 10-15%Coverage t ."K -SEAGATE OR Q ' '� 1,000 aaw Jr -IP Notes; SHOAL GRASS-Halodule beaudettei(5.61 Ac) 2016 Notes: ralprovidedbythecomercounyPropertyAppraisec 0 TURTLE GRASS-Thalassiatestudinum Fieldwork conducted on Juy 21st 6 July 2616,2016. - Of (Instances) FIGURE 6.Sea Grass Summary 5.2.7 Benthic Observations A variety of benthic organisms were observed during our fieldwork for the sea grass monitoring. The photos below illustrate a few of the invertebrates, algae, and sea grass observed. 45 Agenda Item#5 Page 46 of 71 r i.' t ,,,'' AMP 1' a..._ < . Southern Hard Clam Lightning Whelk Nine-armed Sea Star "V t , � .. r 84 4 -; Red Macro Algae Shoal Grass Turtle Grass 6.0 PROTECTED SPECIES MONITORING This section describes the fieldwork conducted in conjunction with protected species monitoring within the Clam Bay N RPA. 6.1 Monitoring Methodology To assess the property for listed species, ETE reviewed the Florida Land Use,Cover&Forms Classifications (FLUCCS) designations previously mapped by THA for the major habitat types in Clam Bay. The FLUCCS codes were cross- referenced with a list of protected plant and animal species. The lists were obtained from two agency publications: • A list of animals was obtained from the FWC publication "Florida's Endangered Species, Threatened Species & Species of Special Concern-Official Lists", Publication Date:January 2013. • A list of protected plant species was obtained from the publication "Notes on Florida's Endangered and Threatened Plants", Florida Department of Agriculture and Consumer Services, Division of Plant Industry, Bureau of Entomology, Nematology& Plant Pathology-Botany Section, Contribution 38, 5th Edition-2010). The result is a composite table that contains the names of the protected species, which have the highest probability of occurring in each particular FLUCCS community. See (Table 2) of this report for the species list that applies to this property. In the field, each FLUCCS community was searched for listed species or signs of listed species. ETE made note of wildlife observed during all fieldwork activities and kept and active log of sightings. Signs or sightings of all listed and non-listed species were recorded. In addition to general observations of wildlife and listed species, ETE conducted a specific purpose gopher tortoise survey within the coastal scrub habitat located between the beach and mangrove communities. This habitat is found north to south along the entire western edge of the Clam Bay NRPA. For the tortoise survey, ETE utilized overlapping belt transects to insure complete coverage of the habitat. Observed gopher tortoise burrows were assessed for activity and their locations taken with a Trimble GPS. 46 Agenda Item#5 Page 47 of 71 6.2 Results (Figure 7) details the results of ETE's specific purpose gopher tortoise survey within the coastal scrub habitat. A total of 141 active and potentially occupied burrows were identified during the survey. The FWC, when estimating gopher tortoise populations, totals all active and potentially occupied burrows observed and then divides by 2. For this survey, the total would be 141 burrows \ 2 = roughly 71 gopher tortoise (adult & juvenile) as the estimated population in Clam Bay. ETE noted juvenile sized burrows (as a sub-class) only to give an idea of where breeding may be taking place. Abandoned burrows are also noted in our survey—they may include old collapsed burrows or potential armadillo burrows. There is a lot of exotic vegetation in the coastal scrub habitat north of Clam Pass—the entire stretch from the pass to Bay Colony is infested with Scoevola. The gopher tortoise would benefit greatly if it were removed. Additionally, there is a lot of Wedelia mixed into the sea oats and beach sunflower groundcover, especially south of the pass. Controlling this exotic vegetation would improve tortoise foraging habitat and help increase the overall gopher tortoise population. (Table 3) details all significant observations of birds, mammals, amphibians, and reptiles on the Subject Property. Protected species within the table are highlighted. 47 Agenda Item#5 Page 48 of 71 :.,,,r irs.. .4;4V., ;b t Ali ry , y $ 4 i «a c + * w err �: = .r ( f M1t �r " ' . a ''�At ® `�` �." ; 'r trig ',, " A0. c,, i r - t � -"'f €� r - ,; f` k L, 7--4,.-., .,.,,:,.,,..1 0,,., s "M gym, * ,, , . ,,t ' Vit. 4 +rpt 1� t „y .. ' r tea” a '{t `' .. f r „ �k .r y , ice' 1.,. a xr .!u t tt.. 11). ',/:1:..d....4".:::**'1(j, _7400, - t ' ti.,,r ie i.7 _ CLAM BAY NRPA BOUNDARY °+ 4 t ,, GOPHER TORTOISE SURVEY(2016) : . . . , ilt.i.,,...... o Active Adutt GT Burrow{72) ', a Active Juvenile GTBurrow(B) t �� o Abandoned GT Bartow(24) It if! v ,,.;;`,3` o Potentially°coupled Adult GT Burrow(51) itZ. ' +— ...,% 0 Potentially Occupied Juvenile GT Burrow(12) . , . r , ''' ,.,?..Y.,41,,,,,. \ 1.",_ ,....ir.i.ii, . - , s, iiir ,,..--iii, ..,,.. i F 1. i.,,,..., .44i-1 it iii ...1,,,w,,,,,, „. , , ,. ,,., , , ,. . , ,,... . . . ., ,..,, .. ‘. . ; , . 4,„,.,. --„,.. ..,.. ,...., ..,,, ....,, ,, „,.. ,,,,,,40,0 , ' i' u,' ♦ rrmttw. , __............, , .t ... ytr, . . 9 FIGURE 7. Gopher Tortoise Survey 48 Agenda Item#5 Page 49 of 71 TABLE 2. Protected species list according to FLUCCS category 322 Curds Milkweed Asclepias curtissii E - v Eastern Indigo Snake Drymorchon corars couperi T T Fakahatchee Burmannia Burmannio flavaE Florida Coontie Zomio floridana C - Golden Creeper- Ernodea littoralis T - Gopher Frog < Rana cap/to SSC - Gopher Tortoise Gopherus Polyphemus T - Iguana hackberrry Celtis/guanaco E - Joewood Jaquinia keyensis T - Prickly-apple Cereus gracilis E Spiny hackberrry Celtis Pallid° E 428 Audubon's Crested Carcara Polyborus plancus audubonii T T Eastern Indigo Snake Drymorchon corals couperi T T Florida Black Bear Ursus americanus floridanus T - Florida Panther- Fells concolor coryi E E Simpson's Stopper Eugenio simpsonu T - 510&540 American Alligator Alligator mississippiensis SSC T(S/A) Everglades Mink Aromaso Mustela vrson o evergladensisnT - oSSC - Little Blue Heron Egretta cacrulea SSC - Reddish Egret Egretta ru(escens SSC Roseate Spoonbill Ajaia ojaja SSC Snowy Egret Egretta thula SSC - In-colored Heron Egretta tricolor SSC - 612 Brown Pelican Pelicanus occdentalis SSC - Florida Black Bear Ursus americanus flondanus T - Little Blue Heron Egretta cacrulea SSC Prickly-apple Cereus gracilis E Roseate Spoonbill Ajaia ojofa SSC Snowy Egret Egretta thula SSC - Tri-colored Heron Egretta tricolor SSC - 642 American Crocodile Crocodylus acutus E E Little Blue Heron Egretta coerulca SSC - Roseate Spoonbill Ajaia ajajo SSC - Snowy Egret Egretta thula SSC - In-colored Heron Egretta tricolor SSC - 651 American Crocodile Crocodylus acutus E E American Oyster-catcher Hoematopus palliates SSC - Least Tern Sterna Antillorum T - Little Blue Heron Egretta caerulea SSC - Piping Plover Charadrius melodus T T Roseate Tern Sterna dougaltii q T T Snowy Egret Egretta thula SSC - Southeastern snowy plover Charadrius alexandrinus tenuirostris T Tri-colored Heron Egretta tricolor SSC - Abbreviations: Agencies FWC=Florida Fish and Wildlife Conservation Commission FDA=Florida Department of Agriculture and Consumer Services FWS=United States Fish and Wildlife Service Status E=Endangered T=Threatened T(S/A)=Threatened/Similarity of Appearance SSC=Species of Special Concern C=Commercially Exploited 49 inommin Agenda Item#5 Page 50 of 71 TABLE 3. Birds, Mammals, Amphibians, Reptiles, & Plants Observed on the Subject Property Birds Anhinga Anhinga anhinga DV N - Belted Kingfisher Ceryle alcyon DV N - Black Skimmer Rynchops niger DV Y SSC Black Vulture Coragyps atratus DV N - Black-Crowned Night Heron Nycticorax nycticorax DV N - Blue Jay Cyanocitta cristata DV N - Boat-Tailed Grackle Quiscalus major DV N - Brown Pelican Pelecanus occidentalis DV Y SSC Double-Crested Cormorant Phalacrocorax auritus DV N - Gray Catbird Dumetella carolinensis DV N - Great Blue Heron Ardea herodias DV,HV N - Great Egret Ardea alba DV Y SSC Green Heron Butorides virescens DV N - Herring Gull Larus argentatus DV N •- Laughing Gull Leucophaeus atricilla DV N - Little Blue Heron Egretta caerulea DV Y SSC Northern Cardinal Cardinalis cardinalis DV N - Osprey Pandion haliaetus, DV,HV Y SSC Pied-Billed Grebe Podilymbus podiceps DV N - Red Shouldered Hawk Buteo lineatus DV,HV N - Ring-Billed Gull Larus delawarensis DV N - Roseate Spoonbill Platalea ajaja DV Y SSC Royal Tern Tholasseus maximus DV N - Ruddy Tumstone Arenaria interpres DV N - Sanderling Calidris alba DV N - Snowy Egret Egretta thin° DV Y SSC Tree Swallow Tachycineta bicolor DV N - Tri-Colored Heron Egretta tricolor DV Y SSC Turkey Vulture Cathartes aura DV N - White Ibis Eudocimus albus DV Y SSC Willet Tringa semipalmata DV N - Yellow-Crowned Night Heron Nyctanassa violacea DV N - Mammals Armadillo Das .us novemcinctus OH N - Grey Squirrel Sciurus carolinensis DV,MT, N N - Manatee Trichechus manitus Y T Raccoon Procyon lotor DV,MT N - Re•tiles American Alligator Alligator mississippiensis DV Y SSC Black Racer Coluber constrictor DV N - Brown Anole Anolis sagrei DV N - Brown Water Snake Nerodia taxispilota DV N - Common Cooter Pseudemys floridana DV N - FL Scrub Lizard Sceloporus woodi DV N - Gopher Tortoise Gopherus polyphemus DV Y T 50 Agenda Item#5 Page 51 of 71 Am•hibians Cane Toad Bufo marinus N - Fish Atlantic Needlefish Strons lura marina DV N - Striped Mullet Mu:il ce.halus DV N - Marine Invertebrates Eastern 0 ster Crassostrea vir:inica DV N - Plants Butterfly Orchid Encyclia tampensis DV Y E-FDA-CE Common Wild Pine Tillandsia asciculata DV Y E-FDA Giant Wild Pine Tillandsia utriculata DV Y E-FDA =Protected Species Abbreviations: Agencies FWC=Florida Fish and Wildlife Conservation Commission FDA=Florida Department of Agriculture and Consumer Services FWS=United States Fish and Wildlife Service Status E=Endangered T=Threatened T(S/A)=Threatened/Similarity of Appearance SSC=Species of Special Concern CE=Commercially Exploited Observations DV=Direct Visual HV=Heard Vocalization OT=Observed Tracks OH=Observed Hole\Burrow MT=Marked Tree C=Cavity DB=Day Bed N=Nest 7.0 EXOTIC & NUISANCE VEGETATION MONITORING This section describes the fieldwork conducted in conjunction exotic and nuisance vegetation monitoring within the Clam Bay NRPA. 7.1 Monitoring Methodology ETE made note of all exotic and nuisance vegetation observed with the Clam Bay NRPA during all fieldwork activities. Specifically, ETE documented any Category I and II invasive plant species as defined by the Florida Exotic Pest Plant Council that were observed. At each observation, a location was taken by GPS and the species of exotic vegetation was noted. 7.2 Results (Figure 8) details the results of exotic and nuisance vegetation mapping throughout Clam Bay. The majority of exotic and nuisance vegetation in Clam Bay was observed along the "margins" —the east side of the mangroves along the tram berm &the west side of the NRPA in the beach dunes. These areas are adjacent to the most human activity around the system. Exotics identified during mapping included but are not limited to air potato, alligator weed, 51 Agenda Item#5 Page 52 of 71 Australian pine, balsam apple, bishop wood, Brazilian pepper, carrotwood, cattail, Cuban laurel fig, java plum, seaside mahoe, old world climbing fern, periwinkle, scaevola, shoebutton ardisia, strawberry guava, and wedelia. , AA >ot " < ti! s^w S - s d '` J , «�x f Execs observed a lb? sEL ., ,� ' * l • ' CLAM BAY NRPA BOUNDARY e ' •e'er"- lk:-•'" ., ;..''''''''''.4 Scaevola Area{t20 Ac} =k"' f a a., tGl 1# JJ. &{ 0 7000 € 2000 ` ^sr 4 per"f lr'. 1. 'y, d3€t `*,x NoteS ,�,, ,: 1.2016 Aerial obtained from Colter a' "i� fk t County Property Appraiser. 4P jr f ' 2 Exotics observed date range between .„a a Ryr,,,tA +i March 1,2016&Sept 26,2016 3}. 3.Exotics Include but are not limited to .r Air potato,Alligator weed,Australian $414'.(10 pine,Balsam apple Bishop wood,Ar s Brazilian pepper,Carrotwood,Cattail, : fir , Cuban Laurel fig,Java plum,Maki.). Old World cirnbrng fern.Periwinkle, c #' Scaevola.Shoelwtlon,Strawberry • Guava,Wedelia. S ♦i _- a k. w R 1, s ns 3A' w w • $\‘ - '444-4 i - ' ,..,• tAq �« w.. � .."4iyA b i'''''‘..'‘ x +: "M`, -. 1k 1 ' i '191 +��.3 Q' air► a .• ' b _ a . 44'j•E .4 �,4N''ra t * v, _ & 't,.�'k. 447,, ':: + r t F. * ,,A' y 7 fir.. d :'7 li -7:: ''''''': it,, ,,,. . ... ....1, _ tt,,,__: „..r,,, „ _. 1: 0:11 ii , , , ,...6 .. „ 0 ....,,,r, : ,,,,,,, ,....., , . lAO,��,,�y 'MP.`Nd.,,,-.44C,.-- Ss _ ; • till. ! .1fllr !. FIGURE 8. 2016 Exotic Vegetation Mapping 52 Agenda Item#5 Page 53 of 71 8.0 WATER LEVEL MONITORING This section describes the fieldwork conducted in conjunction with water level monitoring in Clam Bay. 8.1 Monitoring Methodology Three (3) groundwater level monitoring devices (In-Situ Rugged Troll)were installed in shallow wells within Clam Bay. The new water loggers were placed in the existing PVC wells previously installed by THA. Each logger was set to record the water level within the well every thirty (30) minutes. Data is stored within the device and downloaded on a quarterly basis. After each download,the raw data is analyzed and appended to a summary graph for each well. To better assess the influence on the water levels,the following data was added to each graph: • Site specific rainfall data provided by the Club Pelican Bay—to show the impact of significant rainfall events on the system. • Lunar cycle information — because the system is tidal and the lunar cycle (i.e. full moons and new moons) have a big impact on water levels in Clam Bay. 8.2 Results (Figure 9) shows the locations of the installed water level loggers. (Figures 10, I I, & 12) are the summary graphs for each well. Of note in looking at the summary graphs, is that the water levels in the wells are heavily influenced by the lunar cycle. This is especially evident in November 2016, when there were no recorded rain events, but there were significant changes in water levels (lasting a week to I 0 days) that are apparently associated with full and new moons. On the graph,full moons are indicated by the upper curves at +I,the new moons by the lower curves at-I. Water levels at all 3 wells have been above the ground nearly continuously since July of 2016. The highest 2016 water levels throughout the Clam Bay system appear to have occurred around September 1st. Standing water was approximately 1.5 feet above natural ground at all 3 wells for at least a week. Interestingly,the largest rain event of the year that occurred in late June and totaled roughly 5 inches did not have a huge impact on water levels at any of the loggers. 53 Agenda Item#5 Page 54 of 71 :k . � 1� �50 3.000'. , ,.• . 0 ,;4•44..!.V. t` .r-'',, y ( ' -. �a, �•� �:..� � luil_ s fG1� r „x Y'� '4k i i Upper ..z WM , ° a f' ,Q • µY' Clam Bay ,.` A J y v «s • TURKEY OAK LN 1 (�{f Y WILLOWW000LN , _ ✓•. J 'P y,y 4 AN Clem -'yr* 1. ^r r Z :.,'' } ein VAli r� + f& 4"',,,,,,:Z4 ,,. , ",`, aitf4t$ - z f"4„„, • ,--4 .., , „...c..„,..,..,,, ,,u,,„ ty�r.* Gu+i OnaK GR � s- „�ytli” JF a4 '; . �a 3 .s, , a —..„..9,,,` 4,,.. dr ,w i1 -,' A<NWOQANY co .0 `` �`r Vii► `' g ' _ g f{ � ^� CK , ..tifa1. . w Y a s Qq.y �i Y r t.' r w.w' a 1 400, ., i .' v <, a j . ' s 3 > • `"§ .. "` . ^eve - . , ,. €; WATER LEVEL LOGGERS (3) "� A"" ` , ,: .Y , x0. FIGURE 9.Water Level Logger Locations 54 Agenda Item#5 Page 55 of 71 Clam Bay Water Levels - Well #1 (South) .014,4 ANG(Oh) _ _- Water level WELL#1(ft) -Site Rainfall(in) "'''Lunar Cycle cn.vawnw.uc 6 —_ 4 c ea • z u ( , \.‘e \It t iD 40 40 W 40 40 CO CO 40 CO CO 40 40 40 40 CO CO 40 CO 40 40 40 CO 40 40 40 CO 40 CO s 5g 5 5g, gig _ Water Levels at South Well No.1 within Clam Bay Estuary,Installed March 18,2016-Data Retrieved November 18,2016. FIGURE 10. Summary Graph, South Well #I 55 Agenda Item#5 Page 56 of 71 cth Teed Clam Bay Water Levels - Well #2 (Mid) 411 ANG(Oft) -Water Level WELL 42(ft) --'Site Rainfall(in) - Lunar Cycle tn.ve..+.s.t.uC 6 -- 4 C N C eC l7 • • I:1110; 004 2 I CD tD <o CO CD tO CO tO CO CO t0 m CO tO tqo tO CO CO tO CO tO b CO b CO ID CO CO COo tV gl N N N R § § N N P rq O P P R I § 1 _ d CC�3 t��j �S O� {dVj O-T Qf a� N C C f f Y rn c�3 2 F v v aS 5 n n n ce 0^3 cn m o`i c 3 g Water Levels at Mid Well No.2 within Clam Bay Estuary,Installed March 18,2016-Data Retrieved November 18,2016. FIGURE I I. Summary Graph, Middle Well #2 56 Agenda Item#5 Page 57 of 71 von Tec4 Clam Bay Water Levels - Well #3 (North) 1111/ """+"'N,(Oft) —Water Level WELL e3(ft) —Site Rainfall(in) Lunar Cycle owe...nut uc 6 — C • C cc 3 Z 2 • 5 _414_ -licit Ai' V • O 0 0 CO 0 0 0 t0 0 0 0 0 0 t0 C1 t0 10 CD 0 0 0 b tD cC 0 0 CO 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 • N N N N N N N N N N N N N N N N N N N N N N N N N a 0 e 0 0 o S 0 gl N 52 g a m 3 C n n C n yo N M N M N N N � N � N Ni v o .n � to tO i0 t3 r` n n °' rn rn � FIGURE 12.Summary Graph, North Well #3 9.0 HAND DUG CHANNEL MONITORING This section describes the fieldwork associated with hand dug channel monitoring in 20 I 6. 9.1 Monitoring Methodology ETE spent considerable time assessing and mapping the network of hand dug channels in Clam Bay in 2016. Due to the recent mangrove die-off within Clam Bay system it was determined by the Clam Bay Committee, ETE, and PBSD staff that the focus of hand dug channel assessments should be the northern limits of the Clam Bay, in and around the die-off areas. In reviewing past hand dug channel maps in the field, ETE found that locations of the channels were difficult to find and often the layouts were simplified. We felt that accurate locations of the channels, especially within the die-off areas was a critical piece of information moving forward. In March of 2016, ETE began comprehensive mapping of the hand dug channels in the northern part of Clam Bay using Trimble GPS units capable of sub-foot accuracies. As the channel locations were mapped, ETE also assessed the condition of each channel with respect to remaining depth of channel below natural ground. These assessments were made at approximate 20 foot intervals, or at each channel intersection, whichever was less. Channel depths below natural grade were broken down into three (3) categories: • less than 6 inches (shown as red dots) • 6 to 12 inches (shown as yellow dots) • greater than 12 inches (shown as green dots) 57 Agenda Item#5 Page 58 of 71 These depth measurements are intended to provide information as to where channels are filling in and not providing the flushing they were designed to do. 9.2 Results (Figure 13): shows an overview of the hand dug channels in Clam Bay as previously mapped by THA along with channels mapped by ETE using Trimble GPS units. (Figure 14): enlargement of channels mapped by ETE using Trimble GPS units. (Figure 15): an enlargement of ETE's channel assessments (north map). (Figure 16): an enlargement of ETE's channel assessments (south map). ETE mapped many channel segments that had depths below natural grade of less than 6 inches. The majority of these were along the western edge of upper Clam Bay. This makes sense because these areas would be at the eastern edge of the channels where they discharge into upper Clam Bay. The most sediment build-up would be at these "downstream" locations. After channel assessments were completed in March, a PBSD contractor was hired to perform maintenance on the hand dug channels. The contractor was provided the ETE mapping with instructions to focus on the identified trouble spots. After maintenance activities were completed in April of 2016, ETE performed follow-up inspections to verify that the maintenance work had been done. ETE verified that the maintenance work in the hand dug channels was completed. We did have concerns moving forward regarding the scope and methodology of the maintenance work. From our observations, silt material from inside the hand dug channels is being excavated by hand and placed immediately on either side of the channel. It appears that in most cases, a lot of excavated material is ending up back in the channel as soon as standing water in the area is higher than the lip of the channel. For maintenance work next year, we are recommending that the contractor be asked to move the excavated silt material further away from the channels. 58 Agenda Item#5 Page 59 of 71 ' '`', • a '�'T"'Mg 4 ,, t a- ct bs,t• ," }' Y �► a. .a x� k F ' �� .. t ' ,A' ' 4 NO - „y' :,. ` . " Oilivilligiter 'ii +Vs :*.,k nrw ty *tit' #g a ` _ V4w •"° 0�y .4 ovo bita' s . kta111116414151.1 ` Y \''- y ' -- e - v.' i :,.,:.,„2.2.4e,-e„,,givkiikqr:0-0-mtifitzzi,:ig,t4ii. . - 1 f„, ri***Nliit4.4*.teoageiad,NNN7A, el — .-- 1 :-:":: 1 , , , 4 - ..,- n it �i " 6 • :fir ,e (c`e�. �. ?sem �j ec.i [y+ -- �'1 3 s.. �= "2-! 4'4.4i* ;," . t *:; Y J tif t „ yowo ' ' ilo.. 41* . ,1-Ts....... N ti° Y''°,p fit e it i''';,0.•:;z*,i4iikii,iiatiftWO'tT7''',': , ,_. /____) tt +�` ,. �+' + C .,'• ''''rtilr:1 r r.....b.. . '''.. 4 • 11,1,,eir, N,,,,,, , 441._ , .Itl6 e. -.7,,,,-,.,„ .s r , +�� %* en"t a ?, � .`. y ETE Mapped Nand Cut Channels(GPS) 4 ' ' t4l „' ` ��' — TNA Mapped Hand Cut Channels °. t, le, s � " FIGURE 13. 2016 ETE Hand Dug Channel Overview 59 Agenda Item#5 Page 60 of 71 . n� k 1`T T i l '''1',::,",,, '''''4(..::::'''''''' '''',. .‘4‘..::. '''.--- ;$1:.,,''' -''')-.‘ * rfi ,$1.'''''''''';1"I: ` '____ uppe Caarn ay r 1 t , t a r s -,.. 3 {j y} 1 t 4Y. ta » ...;,,„,i."„i"..!" .,,ii.Z.,"..,"f", ...,:".'''e'..M,',..Ft-,.r..i, ''.,. • "1„..101 ,,„ .„ .'",`,T. v' '' .•• '','''' ,' 'IL...„.,„„litiei. '":e j. r ;�, 4-.; t i r 0 {p D 3. '6W 1.110. __ iii-illiAT.1,:',,r'AR',"-.;-"A'',:2113:i-JV:-', :'''',:R..-7f;-'''' t Hand Dug Channels(GPS) e FIGURE 14.2016 ETE Hand Dug Channel Mapping 60 Agenda Item#5 Page 61 of 71 Hand Dug Channels(GPS) " t Approx NG to Top of Muck :i4.-.:1., !• r "� <6 inches f ,! i. • -it 6 to 12 inches a a c u ! i >12 inches1 , :v 300 **- " if,„(e .✓ ..... . '''.% '‘..::: :::::4:::0,:i..''' ii. ,... ._10' . _ 4 ) .. !.!, `�r‘,� a * , . ' i ,, ' 404aelte-4----- • a* 1 �y j aro-' k'= Q i. ,.I, +., u a t r ,, ®Y m a ! *v' e .41;\4 02, t 3 u i* a e a ayg ' !1400- _. Q e ! ! A. . ,dx 7. - a .. , ,}` a., `a o FIGURE 15.2016 ETE Hand Dug Channel Condition Assessments(North Half) 61 Agenda Item#5 Page 62 of 71 i ok ti ,00hs. ss .` f` g �y to .R:= 0.. tL ` �P._ Y yay_$ ' p s i t s 4- i. ''S ' ratfi40 w. r , <a 3 • a, � Y ^ . x � � W rte. ` r s v :o 0 fA Q Hand Dug Channels(GPS) Approx NG to Top of Muck "! ‹6 inches ? 6 to 12 inches 12 inches FIGURE 16.2016 ETE Hand Dug Channel Condition Assessments (South Half) 62 Agenda Item#5 Page 63 of 71 10.0 RECREATIONAL FACILITIES MONITORING This section describes the fieldwork conducted in conjunction with recreational facilities monitoring in Clam Bay. 10.1 Monitoring Methodology ETE was tasked with monitoring the status of canoe trail marker signage for the purposes of obtaining quotes for repairs and to inform the PBSD of any damaged elements. The marker inspections were done by boat. The location of each marker was taken using a Trimble GPS unit. Each channel marker and sign was inspected for damage. Inspections were completed in April and October of 2016. Photographs of each canoe trail marker were taken to document their condition. 10.2 Results (Figure 17) details the GPS locations of all canoe trail markers in Clam Bay. Below are photographs of each marker documenting its condition at the time of our last inspection. All markers and signage were found to be in good condition with no apparent issues. ETE is slated to conduct future inspections after any major storm events. 63 Agenda Item#5 Page 64 of 71 > !" ,-' - 7 3 i!. • A_ X750.i>t 1 500. ., 3.000 ,. t v+ 1r N rt a‘ `t0'�a"s" ', j r.,,e'S vy=� h, fr °a..= d"''"�' F+f `.��.; ,. wa upper fres x - �,:,, ,„?s; Gam 4' "' ‘,..,,-,'",.4. K �v`iv, ,a `° fist' �. v 8 S ,t �1< &'wa�a„=aa ' ke'' + ¢ #-"� `gapr • '� ' BNADOW WtE IN 1-1 A;"=" ,, �,. , 1 t� TURKEYOAItIN * *. , v � , � .� ET -. , r t ��"`000 aro eon s c - y e " ,tr" ti 4, x� ,10. drzxa.,. ro #~4 : (T � ' v ». -1%.'.,11...044‘`,.. M044 .'. { is ro g1 .© .� t i. ,L, , i ..:' 1' ' ' :'1 ' t*ii:'''''''' r �, 4. S {' "I fE{ - � , •fit.y ..Gulf, Eit t n # )j- .v of n ' .. ' ave �yy��yppppv b a'X� - ((�� iii- v .., OQ % x Tip/iEla?.. , p v �° -ao �` R w a ,r * t • 3 1 - r� }, Sy ��, y43 7v v §1, �,, *� F' � �'' t+�' * � p"tt. .+ ., '^ ` C v 't. < sez.th �P CANOE MARKER LOCATIONS(32) a ' " "' ' .f.`1.4�� ' '''*4 y„s"' '.14.4 1 1 Canoe marker bcetuns were taker.web a Trott*GPS urt!an Apal 27.2016by ETE, • FIGURE 17. 2016 Canoe Marker Locations 64 Agenda Item#5 Page 65 of 71 E t s, OM IARNEY • EN • CLAM PASS $j\ - y +"— ,,,, N , .» M554MITIOY . au,, w �ic 7 lig w �• - ams q/ J " t F ,-,,..-1-, ate," ; y s. --"T c�4t;.,tii .F,p .•",. t . y � , a'• i crass `x'& <1.1,1 "f' ii, g S .. i . . 65 Agenda Item#5 Page 66 of 71 r .K M 6 _ t a- y i„a — , M ■■■■ N• 5y r ' j` AK :',..",..,:,it".., ✓ r3 ER wt,tz / . wrGA5 ,. �v S'. • t a a e e • • • ...,...-.77--:R; ' � yy r -", '-' k •rr'ro ... x�- s `a aai ass + ,v ^t ,--,........--1,4, ..-1,• 4 "t *-°X' .. . �ygr y . . i- 9,aK'M'fi'{L '"?' aii 4n 4 'Ii e.: , '� —ai. mar • .. ,. o 66 Agenda Item#5 Page 67 of 71 1 1.0 ARCHAEOLOGICAL SITES MONITORING This section describes the fieldwork conducted in conjunction with archaeological monitoring within the Clam Bay NRPA. I 1.1 Monitoring Methodology Three (3) known archaeological sites were previously identified within Clam Bay. (Figure 18) shows the locations of the three sites as provided to ETE by THA. 11.2 Results ETE evaluated all three (3) archaeological sites in July of 2016. The sites as shown on (Figure 18) and their vicinity were walked by transect to look for any signs of disturbance. No obvious signs of shell mounds were observed in the locations identified and no signs of disturbance was observed. A photograph within each site is provided below. ;. tom, ti l !t rT •fid) sS,. r-le:, s � ' • ?S ,j s , r. , r North site,typical mangrove habitat Middle site,typical mangrove habitat South site,typical mangrove habitat present. No signs of disturbance. present. No signs of disturbance. present. No signs of disturbance. 67 Agenda Item#5 Page 68of71 0 �� '"` �� r) _ re itstots;, '''' Ut:3- .'' . ,,,,,:s ittko. : : " a ' .' , , .(.:71st: a t ,. , . .3� dt abs a * * ' '*1.(..:0•1 ' ' 4hillik• >. a ill n SSM 2 tk' ue. 4s ;_R ." 1/4.4 ‘ l :� ?. , 1 .Fra'1 Previously Documented Archaeological Sites(3j ? 1 . tea FIGURE 18. 2016 Archaeological Sites Overview 68 Agenda Item#5 Page 69 of 71 12.0 SUMMARY The following are brief summarizes of work completed and recommendations for each major monitoring category: Mangrove Monitoring ETE monitored eleven (I I) mangrove plots previously established by THA, two (2) plots previously established by Lewis,and established eight(8) new plots in mangrove die-off areas. In each plot,the mangrove species, diameter and abundance was recorded, as well as the condition of each tree. ETE plots established in the identified mangrove die- off areas reflect the scale and scope of mortality within them. We included data for the number of remaining trees showing stress to give an indication of potential future mortality within the plots. Next year's monitoring of ETE plots will be a great indicator of whether the health of trees in these areas is trending upward or downward. ETE recommends abandonment\replacement of the final two (2) Lewis plots to make them consistent with all other mangrove plots. Coastal Scrub Monitoring There is a lot of exotic vegetation in the coastal scrub habitat north of Clam Pass—the entire stretch from the pass to the south end of Bay Colony is infested with Scaevolo. Scaevolo is a Category I exotic plant as defined by the Florida Exotic Pest Plant Council's list of invasive plant species. It is known for supplanting native coastal vegetation, forming dense monoculture areas. Additionally,there is a lot of Wedelia mixed into the sea oats and beach sunflower groundcover, especially south of Clam Pass. The coastal scrub habitat is home to a significant population of gopher tortoise. The gopher tortoise would benefit greatly if the Scaevola were removed-management of these exotic vegetation infestations could improve the tortoise foraging habitat and help increase the overall gopher tortoise population. Sea Grass Monitoring Overall coverage in 2016 was 5.61 acres, up from 4.71 acres in 2015. This increase was despite dredging activities in April of 2016. Percent cover densities within the mapped sea grass areas were generally higher in 2016 than 2015. Monitoring next year may give a better indication of any potential impacts or benefits from the Clam Pass dredging activities. Listed Species Monitoring ETE conducted a specific purpose survey to determine gopher tortoise utilization of habitat within the Clam Bay NRPA. A total of 141 active and potentially occupied burrows were identified during the survey. The gopher tortoise population was estimated at 71 individuals (adults &juveniles). ETE observed and noted pockets of several juvenile- sized burrows at multiple locations, giving an idea of where breeding may be taking place. Abandoned burrows are also noted in our survey, which may include old, collapsed burrows or potential armadillo burrows. Management of foraging habitat within the coastal scrub is the key to maintaining and growing the existing gopher tortoise population. Exotic Vegetation Monitoring The majority of exotic and nuisance vegetation in Clam Bay was observed along the "margins" —the east side of the mangroves along the tram berm and the west side of the NRPA in the beach dunes. These areas are adjacent to the greatest human activity around the system. Exotic plants identified during mapping included, but are not limited to: air potato, alligator weed, Australian pine, balsam apple, bishop wood, Brazilian pepper, carrotwood, cattail, Cuban laurel fig,java plum, seaside mahoe,old world climbing fern, periwinkle,scaevola, shoebutton ardisia, strawberry guava, and wedelia. ETE will be working with PBSD to specifically target and kill exotic vegetation in the trouble areas identified in the exotic mapping events. Water Level Monitoring Of note in looking at the summary graphs, is that the water levels in the wells are heavily influenced by the lunar cycle. This is especially evident in November 2016, when there were no recorded rain events, but there were significant changes in water levels (lasting a week to I 0 days) that are apparently associated with full and new moons. On the graphs, full moons are indicated by the upper curves at +1,the new moons by the lower curves at-I. Water levels at all three (3) wells have been above the ground nearly continuously since July of 2016. The highest 2016 water levels throughout the Clam Bay system appear to have occurred around September I st, where water was approximately 1.5 feet above natural ground at all 3 wells for at least a week. Interestingly,the largest rain event of the year that occurred in late June and totaled roughly 5 inches did not have a huge impact on water levels at any of 69 oris Agenda Item#5 Page 70 of 71 the loggers. Continued maintenance and monitoring of the water level loggers is important as they provide data critical to assessing the health of Clam Bay. Hand Dug Channel Inspections ETE reviewed and assessed previously hand dug channels within the Clam Bay system. The channels were originally dug to allow for tidal flushing of mangroves. ETE comprehensively mapped the locatable channel segments in the northern portion of Clam Bay (near mangrove die-off areas). ETE also assessed the condition of each, with respect to depth of channel below natural grade. Many channel segments had depths below natural grade of less than 6 inches, with most of these found at "downstream" locations along the eastern edge of the mangroves where they empty into Clam Bay. Going forward, ETE recommends accurately mapping the existing hand dug channels in the remainder of Clam Bay and reassessing the methods by which they are maintained. Recreation Facilities Monitoring All markers and signage were found to be in good condition with no apparent issues. ETE is slated to conduct future inspections after any major storm events. Archaeological Site Monitoring No obvious signs of shell mounds were observed in the locations identified and no signs of disturbance was observed. 70 Agenda Item#5 Page 71 of 71 13.0 REFERENCES Turrell, Hall &Associates, Inc. "Clam Bay NRPA Management Plan, Version 6.5", November 2014. Turrell, Hall &Associates, Inc. "Clam Bay Annual Monitoring Report", December 2015. FWC. "Florida's Endangered Species, Threatened Species& Species of Special Concern-Official Lists",January 2013. Florida Department of Agriculture and Consumer Services, Division of Plant Industry, Bureau of Entomology, Nematology& Plant Pathology-Botany Section, "Notes on Florida's Endangered and Threatened Plants",Contribution 38, 5th Edition-2010. 71 Agenda Item#5a Page 1 0151 Clam Pass Physical and Tidal Monitoring Report 2016 W P �` -11+x" ° .I s+� Jf�� A S, rob `"- v z rw -_" Ni*.:' "^' .f � ',.,','..4 m �ttt ��, c s�'�=�' s� kgs,' war. _ . -L, ,. rt, October 24,2016 December,2016 Prepared for Pelican Bay Services Division Prepared by ?IM Humiston & Moore Engineers 5679 Strand Court Naples, Florida,34110 (239) 594-2021 Email: and@humistonandmoore.com Agenda Item#5a Page 2 of 51 TABLE OF CONTENTS 1. BACKGROUND 1 2. PHYSICAL MONITORING 2 2.1. INTRODUCTION TO INLET GEOMORPHOLOGY 2 2.2. AERIAL PHOTOS 2 2.3. HYDROGRAPHIC AND BEACH SURVEY 2 2.4. INLET CHANNEL LENGTH 6 2.5. EBB SHOAL 6 3. TIDAL MONITORING 9 3.1. INTRODUCTION AND BACKGROUND 9 3.2. GAUGES 11 3.3. TIDE PHASE LAG 11 3.4. TIDE RANGE 14 4. SUMMARY OF RESULTS&RECOMMENDATIONS 19 TABLE OF FIGURES FIGURE 1.CLAM PASS MORPHOLOGIC FEATURE DEFINITIONS 3 FIGURE 2.CLAM PASS MONITORING SEGMENTS 4 FIGURE 3.INLET CHANNEL LENGTH 7 FIGURE 4.EBB SHOAL CHANGE 8 FIGURE 5.CLAM PASS TIDE GAUGE LOCATIONS 10 FIGURE 6.CLAM PASS TIDE MONITORING—MONTHLY Low&HIGH TIDE TIME LAG AVERAGES—2016 12 FIGURE 7.CLAM PASS TIDE MONITORING—YEARLY Low&HIGH TIDE TIME LAG AVERAGES—2008 TO 2016 13 FIGURE 8.GULF AND BAY TIDE RANGE ILLUSTRATION 15 FIGURE 9.MONTHLY AVERAGE TIDE RANGE AND TIDE RANGE RATIO 16 FIGURE 10.ANNUAL AVERAGE TIDE RANGE AND TIDE RANGE RATIO 18 Agenda Item#5a Page 3 of 51 1. BACKGROUND Clam Pass is a small wave dominated inlet on the southwest coast of Florida that provides a tidal connection to 500 acres of wetland preserve. The pass and wetland preserve have been managed according to a Natural Resource Protection Area (NRPA) Management Plan first adopted in 1999. In 1999 the pass was dredged to re-establish tidal flows and to keep the pass open. Subsequent maintenance dredging occurred in 2002, 2007, and 2013. In January of 2015 an updated management plan was adopted by the Collier County Board of County Commissioners. Maintenance dredging was subsequently completed in early May 2016. This report provides the annual assessment of the bathymetric and hydrologic condition of the pass during 2016. The relatively small tidal prism for Clam Bay provides critical balance between tidal energy and littoral processes at the inlet channel. Clam Pass requires maintenance dredging to remain an open and viable inlet and bay system. A maintenance dredging project was completed during 2016 that removed approximately 15,000 cubic yards of sand from the inlet channel and flood shoal areas and an additional 5,000 cubic yards were graded to simulate natural shoreline transitions along inlet banks. Since the 2016 maintenance project was completed, the pass has weathered the most active tropical season since 2012. Clam Pass was directly impacted by two tropical storms during the 2016 tropical season, Colin and Hermine. Tropical Storm Colin transited offshore heading north in the Gulf of Mexico June 5 and 6, 2016. Subsequently the outer bands of Tropical Storm (later Hurricane) Hermine lashed the Gulf Coast in the first days of September. The storm winds, surge and waves push more sediment into the pass than the tidal flow can push back during the duration of each storm. This report also provides a summary of the physical and tidal monitoring metrics incorporated in the 2015 Clam Bay NRPA Management Plan. Physical monitoring is based upon surveys and mapping of the inlet system. Hydraulic monitoring of the bay system includes continuous water level and tidal data collection at four locations within the bay system. This report is based upon three bathymetric and upland surveys, shoreline mapping prepared by Humiston & Moore Engineers and ongoing tidal monitoring. Conditions before and after the 2016 maintenance dredging are documented and the initial response of the inlet is discussed. 1 Agenda Item#5a Page 4 of 51 2. PHYSICAL MONITORING 2.1. INTRODUCTION TO INLET GEOMORPHOLOGY 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 the 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 the coast. The stability and dynamics of a tidal inlet is based on the balance of these two forces. The direction of wave action plays a significant role in the shape and dynamics of the inlet features. 2.2. AERIAL PHOTOS Perspective aerial views are taken on monthly basis and provided to document the channel alignment and the overall condition of the inlet. These illustrate the condition of the pass prior to the 2016 maintenance dredging, the constructed channel alignment in May 2016 and the evolution of the inlet in response to storms and predominant wave and tide conditions. The removal of the accumulated flood shoal sediment from the channel sections among the mangroves (Sections B and C) is evident. Clearing these accumulated restrictions provides improved flow to the inlet (Section A)which keeps that portion clear.Aerial photos are included in Appendix A. 2.3. HYDROGRAPHIC AND BEACH SURVEY The physical monitoring data is used to characterize the flow areas and shoaling within the channel and flood shoal areas. 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 2 shows 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 an 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 scope of the survey and comparative profile plots with previous survey data are included in Appendix B. 2 Ct , inLc) ...:-D- E E o a) a) m o' (13o Q r x' " stip Y ,,,e'.:1'.'404„1„:*:.' ',''' ' .., s �*, : /6'o�` o• cx O ...4i" 1"1„,„%..., *- 0 cli / 2 I zF^ yy7�. w E In LC) 0 E co a Y . ,- , x u ' s 't s day , V • qq d Y „ � z t , 3.1 . - `r 't--it1v) cu 77--;,..:, f . ,:tt, * ..ti . ,.. .., -r-,t, 111, N co a co U N Q1 i CA te?. d .a` z"g„ 4 .w , kmti Agenda Item#5a Page 7 of 51 2.3.1.Section A—Inlet Channel Section A is the inlet channel portion of the dredge cut. This provides the connection from the Gulf of Mexico to the flood shoal and eventually the bay system. Section A has historically migrated both north and south of the design template, but has recently trended toward a Northwest to Southeast alignment. Maintenance dredging has increased both the cross section area of flow and the minimum cross section of flow to 475 square feet (SF) and 315 SF respectively.These values represent an improvement over the 350 SF and 230 SF observed in February 2016. Compared to previous maintenance dredging events, these cross section values are similar to other periods of hydraulically stable pass conditions. 2.3.2.Section B—Inner Flood Shoal Section B is bound on each bank by mangroves and is the primary flood shoal area. It provides the connection between the inlet and the channels to the bays. As such, 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. When this area is dredged, it becomes a natural place for sediment deposition, as the relatively high speed water flowing through Section A slows down in the wider area of Section B. The deposition of sediment in Section B eventually leads to a narrowing of the flow area available, increasing speeds and carrying sediment further into the channel to be deposited in Section C. Sections B and C combined represent the flood shoal of Clam Pass and when sediment accumulation exceeds the flood shoal equilibrium conditions, it may cause constriction of flow that may lead to closure of the pass following storm events. During the 2016 maintenance dredging approximately 3,400 cubic yards (CY) of sand were removed from Section B. This resulted in an increase of the average cross section of flow from 340 SF to 630 SF. During the six months following dredging, the average cross section of flow declined approximately 5%, to 595 square feet. The average cross section area of flow currently remains greater than during historically hydraulically stable pass conditions, in part due to widening of Section B which occurred as a result of natural scour when Section B was congested during the period between 2010 and 2014, as documented in previous reports. 2.3.3.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 flood shoal and inlet. Restriction of this area reduces the tidal ranges in the bay system and flow through the inlet. Historically this area has served as a reservoir for sediment which accumulates gradually after the initial, more rapid accumulation in Section B. The cross section of flow area was doubled throughout Section C by the 2016 maintenance dredging. Following dredging the cross section of flow expanded another 10% due to mild scour resulting from the improved flow of water throughout Section C. Approximately 20% of the sediment volume removed from Sections B and C during the 2016 maintenance dredging has returned during the first six months. This period immediately after maintenance represents the highest rate of sedimentation as the system responds to the new flow 5 Agenda Item#5a Page 8 of 51 regime imposed by the maintenance work. By six months after the 2013 maintenance project, approximately 33% of the sediment volume removed had returned to the flood shoals. 2.4. INLET CHANNEL LENGTH The channel length is an important factor for 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 which reduces the tidal prism and flow through the inlet. Figure 3 shows the evolution of the channel throughout 2016. The April 2016 mapping shows the long, narrow channel and constricted flow pathway prior to pass maintenance. Following maintenance, the inlet evolved toward its recent stable position, oriented approximately northwest to southeast. This orientation appears to represent the balance between resilient tidal flows and sediment movement on the open coast. The development of a generally balanced ebb shoal is seen particularly from June through October as the sediment is re-shaped around the inlet mouth and the small bar moves from offshore toward the south bank. 2.5. EBB SHOAL The size and shape of the ebb shoal is another key factor to the stability of the inlet. 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 4 shows a table for the ebb shoal design criteria parameters and monitoring measurements beginning with February 2016. Recommended target values are presented in red. The data show a substantial improvement to the seaward extent and plan area of the ebb shoal immediately after dredging. The distance offshore continued to increase from May through November, which is likely a result of continued adjustments due to increased flow volume and velocities, but is also likely influenced by the observed pattern of offshore migration during summer months. On the other hand, the plan area decreased slightly from May to November, likely as a result of wave action consolidating the abandoned pre-dredging ebb shoal into the active shoal area. The newly aligned channel appears to be developing an ebb shoal similar to that in place during periods of inlet stability. 6 +, kOvot- CN m N U ., a-+ . r ft41 0 ., , I .• L2 , Cf3 } a G ¢ ._,.,_.._._____ti-,,-------....„ - i t- pd/A�" fi' 1 l0 N e1 0 IF O O )itN 2"--... , < a . L. 1-- F. ' ate--+ t.,::,:i.„,..,,„ .i.„....„..,,,,,,,,,:.:,.,...„ . ... ....,..,, . . .., ......--„ . ,t..t?, ,........„ ti 11, _1 a - kr „. "`x' ..a' Q1 ;. c co 7 U ? `” - '-��l cr f I ��.��" C) an a) C 0 a1 NJ C t C ( U51.,..„':-.. .0 a t U V1 CO t Il-li ( ROAVN laa4}5uORenai3 tONCO V O 0 Nt0 .":“,c, Q 1 , 4 W NN cam. 00 044•:•=c;"o cJe ec? g9 9 �? '4W"7�^0P m In LO * f m a, .+• l0 e. ° fC ftO _AV. ` " kseMaer a i / 'a * :"' ». �. 0 �� z / 0 N vv - rpt t 7L �� t,,„ 3 �� fC a) LL ta co 0 0 O 0 0 0 0Z ''' S W m 0 0 O O O - > i co Q 'Cr v c�-I N N N Lu N Q) O 4- N Q) i i Er 0 qA C _ c To N ea c a) ro X 0 c c S U N d �� I CD al `) 0 Sms +� cY) N M M E t]o N ? LJJ OL _ A y.. - RS -CI RS O co w 4— (1) c CU a) E E v c-I Q) LO -o LL r-I a c-I �Q) COlD �, 2 > X • IJ— a W 0 a) I ,-, z -o > cin +, CO Z o cri ., co �, 0 0 O W CD v v L v Z ri It NJ• Agenda Item#5a Page 11 of 51 3. TIDAL MONITORING 3.1. INTRODUCTION AND BACKGROUND Prior to the commencement of the March 1999 dredging, water level recording gauges were installed at selected locations within the Clam Bay estuarine system and Gulf of Mexico to measure tidal ranges. Tides along the southwest Florida coast are mixed, meaning that they exhibit either diurnal (one tide per day) or semidiurnal (two tides per day) characteristics at different times during each month, primarily dependent on the phase of the lunar cycle. There are seasonal variations as well. Pre-construction tidal data were collected for a full month to obtain average values representative of the general tidal characteristics for Clam Bay, and to establish baseline conditions against which post construction monitoring data could be measured to quantify improvements to tidal flow.The locations of the gauges are illustrated in FIGURE 5. This tidal monitoring program has been implemented through a cooperative effort with tidal data collection by PBSD, and data analysis and report preparation provided by H&M. Considering the mixed tide characteristics of this area is important for the tidal data analysis, because during the neap tide part of the month when tidal currents are not particularly strong, the inlet may take on wave dominant characteristics and appear to be shoaling near the entrance, particularly if the neap tide coincides with high wave energy events. During the ensuing spring tide roughly two weeks later, however, tidal currents become considerably stronger and may efficiently scour out shoals that formed during the neap tide interval. Short term channel shoaling and scouring that occurs in this manner causes short term variations in phase lag and tidal range data. This process therefore explains much of what appears as scatter in the phase lag and tide range data. When shoals are scoured out of the inlet channel, some of that sand is deposited on the ebb shoal, seaward of the beaches, restoring it to the littoral system.This is part of the sand supply for adjacent beaches; however, some of that sand scoured from the inlet channel becomes redistributed as net accumulation onto the broader interior flood shoals. It is this net accumulation on the flood shoals, usually over a period of several years, which eventually leads to the need for maintenance dredging. The purpose of the monitoring program is to evaluate inlet characteristics on a comprehensive long term basis, with less emphasis on day to day, week to week changes, or even month to month and seasonal changes. Because of the dynamics of this system, the findings of this report provide a comprehensive evaluation of project performance which, at times, may not seem consistent with visual observation of inlet conditions over relatively short time intervals, particularly conditions that may be observed during or immediately after a storm. 9 wzt , 40 '1 i pa y • to ; .> \EV It Qy Rye `.7'4.•,Yd i CIw •Q u m / ,. a D IA , t ' P Cr) ' Z « . : p WccLn Lo Uv 'i " 00 o GY_ u_ c'`v I. C N 0 Q , !' r-I wz.,_ C O rn O u \. Oa > (D F U 1 0 o < V ". S X O 00...0 o 00 = C ` CU I— d 'i^a N -c 4J Lu Q fit' +� aa. a o ! ca U w O 0 z m cu o LL 4 CD U ,� ' �' v Ei_ u o w 0 a. �� E U Ln 'qt QJ bli tijY 4 Y u- Q aM s x . .. c o- !'4 ,ic: / i Agenda Item#5a Page 13 of 51 3.2. GAUGES During 2015, PBSD initiated the purchase and installation new tidal gauges with solar recharging, onsite data logging and remote access capabilities. Installation and initiation of the new gauges was completed in January 2016. The new gauges were installed at marker locations near the previous gauges. Gauges are now installed at the following marker locations, their respective old gauge location is also shown (Figure 5): - Marker 4: Registry(Hotel/County) Boardwalk - Marker 14:South beach Facility Boardwalk - Marker 26: North Beach Facility Boardwalk - Marker 32: Upper Clam Bay Remote access provides the ability to access the data at any time without interrupting data collection. Problems with data recording can be identified as they occur. Monthly data records can be accessed as soon as the month is completed, allowing for monthly updates to be posted on the web. The water elevation time series for each gauge are presented in Appendix C for each month of the 2016 monitoring period available. 3.3. TIDE PHASE LAG One of the parameters monitored during the tidal study is tidal phase lag. This is the time difference between the high or low tide in the Gulf of Mexico and the corresponding high or low tide in the bay. The magnitude of this phase lag is an important indicator of inlet dynamics, because shoaling in an inlet that obstructs tidal flow will cause the phase lag to increase. Short time lags indicate good flushing and scouring ability, long time lags indicate the potentially limited flushing and shoaling. Figure 6 presents a monthly average of the low tide and high phase lags over the monitoring period of 2016. The data shows that the phase lag decreased directly after the dredging of the pass in April 2016 for all Marker locations.The average high tide phase lag went from 124 minutes (over 2 hours) down to 55 minutes (less than one hour) indicating an improved flushing of the pass. Stations further away from the pass (Marker 26 & 32) also showed lower tide lags post dredging, but the observed effects were milder since these gauges are located further away from the pass where the dredging activity occurred. Figure 7 shows the annual averages of low tide and high tide phase lags from 2008 to 2016. Overall the data collected by the newly installed tide gauges correlates well with previous gauges. The gauge at Marker 32 shows a slightly longer time lag than for previous years, this is because the new gauge location is further away from the pass compared to its previous location in Upper Clam Bay. The data also show that the annual time lags for 2016 are in the same range as the time lags observed after the dredging of the pass in 2013. 11 Ch lD N d' l0 N .71' c-I N CO Cr c-1 N CO L L L L L L L 4J N O1 N Y Y Y �C CLI CU Y Y Y L %_L L L L L L 1- CD C c� cC cC cC c0 c( CO C C G G G C C 03 Lo O as a cua ) a— 0 0 Q' 11.1.III"Nillilall O lD O z0 Z rl O N - 111111111.1.11111111111111111 tn .(;'L) u �J 111"11.11.11111.11111O bn ca N > Q Lu n w a b.c co • H. c c E Lu Lu an ,', o z - z r >. O *IIIIIIIIIIIIIIIIMIS o _c— U -> Uvi c C F- i 2 .1111111111111111111111111111 >. >. c S O .. , _,._- 1a w CC H N vi 11111111111111111111.511., ' ("3 m L 1,51.0.4,Zn�N P0. 4:kk�"�`�`^ '+- "�6�a cc cL U T fir,,�a, � w~ c ' l0 LL m j to C C f f6 m OO O O O O O O O O O O O O O V1 O Li, O Ln O Ln O v) O In M N N r1 ci M N N r1 c I (saTnum) 2e1 apil u2!H (saTnuuN) Sed apil mol .rl0 N .1- Lb N s -1 N m Ct. a1 ( ( ( N Cr) (YY - - L L Y- Y Y— Y cccccG C cccL co Z "5 a m LI) _ Lb 0) C(V) < W --> 0 W p o N Q v) O a a N 00 a- o O r9 o N N I, x tin t1A (0 L :lir O N Q tF (tiii � t (0 W ur Vr - a1 Z , Z N E 0a° ,_ M W =11111/ W cI -a 0 O oN F- t C/) N - bi d d No Na- 3 C) �� t N 0 L (0 a1 On N N _ .L C O O F ` `" i », O� a1 O O -0 N f— to VI (0 d 0 E ' *, Ol ErL:L . _ ', _.max P�.v.�5 0 s. _ __v_ .. <.�K�, _,;.� O uN N I- L 3 sad 00 ,w ,.xq vi^,`..�....r.�.,2 O 6L . _ O O O N N Ikm O O O O O O O O lO O lO O O O l s M N N ri c-I CO N N a--I a1 __._ (salnui j) del 0PLL uS!H (salnuiw) Bei apil moi 0 f- € Agenda Item#5a Page 16 of 51 3.4. TIDE RANGE The tide range is also an important indicator of the flushing of Clam Bay and shoaling within the inlet. The tide range is the difference in elevation between high water and low water for a given tidal cycle which is an indicator to the tidal prism or volume of water flowing through the inlet at each tidal cycle. The bay tide range will always be smaller than the gulf tide range, however, a reduced bay tide range is an indicator of flow restriction through the inlet channel and shoal features (Figure 8). Figure 9 shows both the monthly average tidal ranges and tide ratios for the monitoring period of 2016. The Gulf tide range was just above 2 feet, while the Marker 4 & 14 gauges (near the pass) tide ranges were consistent at about 1.25 feet prior to the dredging of the pass. Post dredging of the pass, these ranges went up to around 1.4 feet & 1.5 feet indicating a larger tidal prism and more flow of water throw the pass. The tidal ranges at Marker 26 and 32 were consistent at around 0.2 feet and 0.5 feet respectively. A review of ratios of the tidal range at each monitoring station to that of the gulf tide is used as the monitoring indicator to the flow through the inlet. The annual ratios of bay to Gulf tide from 1998 to date were used to establish a design tidal range ratio for Clam Bay. The available data indicates that when the inlet was hydraulically stable the ratio between the bay (Marker 4 & 14) and Gulf tide was between 0.6 and 0.7 over 90% of the time. The data also showed that this ratio was below 0.5 prior to 1999 dredging when the inlet was unstable and in 2012 prior to the inlet closure. The 2015 NRPA Management Plan set the critical ratio at 0.5, with additional monitoring conducted when the ratio drops below 0.6. The 2014 updated management plan uses the relative tidal range at the Marker 4 and Marker 14 gauges as indicators of hydraulic efficiency. The plot of the monthly mean tide ratios shows that for the month of February and March,the ratios for Markers 4 and 14 were between 0.5 and 0.6 indicating potential shoaling of the pass. The shoaling was later confirmed by a physical survey and the pass was dredged the following month. The post dredging ratios showed significant improvements in flushing of the pass with rising ratios close to 0.8 for the month of May following dredging. For the remainder of the year, the region was hit by two significant storms: tropical storm Colin in June and tropical storm Hermine in September. The monitoring data showed that while each storm may have contributed to shoaling of the pass during a storm as illustrated in the graph for the month of June and September with ratios just under 0.6; the system was hydraulically stable enough to recover each time with mean tide ratios rising up to around 0.7 the month following each storm. 14 .: • . -- ''',„:,.i'., - ' "--- ."- , • . . ,,,, , . - ' . . . ' L'..1.,.,• , , ,.. ,, "" , , ,. _ ':.• —f. 7 ', ',9,.'— t .. . ,1. . ' ':1','`.c, 10',,,i 1 1,,,.'?,;.;,!,;,, -: '.,. ' , :„.• , ''''• i .- ' ,-. '• . = .. -7-,.• • ...: -2- ., ''''', ,,`",',•• , : `,-",* L C,X.P -. '' • '- ' , - ' , , : . ,•,. ,. ` --„,,-,',:,'"-;..;',' i,,,..,;....,,, , , '•-::- , ' ,..,,. -, ,I« :'"'' "',,, '.i. C'),14,7; - .' 1.-k.L.1%:-•-'-,--- ' - ' -, • --''-''--4.3114-1A.*...;*- ' - "- , '' '' tt tit V.. e. 1,.,,.,,,- ....,,,„,,.....:4 2,,1,- .- ', .,-.....„.4,.:1- , ..,„ ,!'„,,. - ,:,,,„f*`-,„ A 1 44' 4-..-, "4,,-,....,"---1.'" "..- - •---•--• •••4"-• -' - -", ,. * .1. -64,4' i,4°4 .-- -1% ''''' ,,,,A,:l.,;,.4.4*.t....-i.16..r .4 . '''''" ' •441.--fili " 2.,, ,,A, .....t..' ; ti, ••41 •4-'" ' ' '' ., ' ,,,2*,:', .i.,,:t.:::-..v ", tA• -i. AL".i . --, L, 4 . Lie; 7 t 4 .... „,„or,- .40 ' •... , ..... . ra T--s ,LL,- • •, r " ... „, ...c -0 CL) ,,-, -1,44.'Pli° 4N,.• --,.. , .i..' " g 1 d'1,. I. 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Wp.• I. ti 0 . = ft 4 '1 , I 1,- k., N m. 0 E — ,1, '.- 0) .,:r •X L L L L Q i v v a) a, -0 c 2 .,r. -1 N m L L ,-- L Ln u ccC L L L L c(O coCc !6 cM c as ° Y Y __ G G G G I (a 4— L L L L ® gg# I aa) ao ■ ■ II ■ ■ - - m a) -coc m aa) LI a) a 0 0 I mmmuiiiioiii I V U S ro W W CL Z 1— -> - 's b0 by Q Q 0 f0 _ I = I 131:1 I = C iiimmilillillilla- ;!,;;24;; ';2;",l',',';.;;,: r ";;":;;;;,'',l 4:;;;.';',.";...'.:7,1;';'..;;;!'i....;‘;S!...k'g.;;;',.i.f,"?51; ; CO to - O Z Z J — ^?: C h , - 1 C c>. 1 >> ce G C 0 I 0) Z Z 0- ro Q 0 Q 0 Q L- a) a W , D_ W Q c _ 0 - 0 I i L 1 0 }J i , _ ,,A; , , . ,. iiiiiiiii,! ' i ' LL L I ,_ a CIAu- c c = no ra I i 1 I I I I O O O O O O O O O O O 00 O 00 O 00 01 00 r•-• lD u1 .1- M N r-I 0 e llllf) Lt10 0 0 0 0 0 0 0 0 0 N N r-I r-I O O oileu apil ueaW (;aaj) aSuea apil ueaW Agenda Item#5a Page 19 of 51 Average annual tidal ranges and ratios for Clam Pass are presented in Figure 10 for the time period between 2008 and 2016. Overall the data shows that the data collected with the newly installed gauges is consistent with data collected with previous gauges. The average annual tidal ranges remain within the range of typical values at Marker locations. The ratios also show that for Marker 4 and 14, in 2016 the ratio was above the 0.6 threshold indicating a stable pass. In 2016, the ratio for Marker 32 is slightly below that of previous years, this could be explained because the gauge was moved further up the bay. The 2016 ratio for Marker 26 increased slightly compared to previous years, this could indicate small improvement in tidal prism near the North Beach Facility Boardwalk area. Monthly and annual tide ranges and range ratios indicate a stable pass. Although the inlet dipped into the critical range at several times over the past year mainly because of tropical storms, it showed signs of recovery each times after the storms, and ratios eventually came back within acceptable values in the following month. 17 ° Cr lD N T O U cr .-i N M — x u 9 O ` ti 41 Cl lD N Y Y Y Y i y ....7,v t° o6 c-I N M L L L L U N cc 2 V ° Y Y Y Y G C c C 1 4- L L L L ® g • k'zR co (6 fd .w. ' w l7 2 2 2 2 It E • E ® PO. ■ 0 NCJC9 , m (DZZ � rNi °p --> o p oN w _ CC p 0 Cit ) V) V) a 11.111i Ln < O \'�' o t o N w '><w N 1 I , ;ns Icr cI 4rl O IN 0 r , Z , Z 4 +-. I a pw —> 1nw 4 M O 0 0 0 1 0 N 0 N al CI- co I a) ON I ON 4 f— oo 4 C 1 (B O o C N (NJ f6 CC _ 1 73 I W O 4 O a0 i i a) Q _ I I To ti 4 C 1 C ' o Q 0 o ri i = i deo 0o 0o Lt o N ' N amu` . yr..,.....,, . e i O O O O O o O O O O O O O O O O u1 O vl o Ln O a) 0o i---. up L) ct co N `-I O (Ni N c-I ,21 O O O O O O o O O O O O (lea}) a2ueJ apil ueaw oilej apLL ueaL N Agenda Item#5a Page 21 of 51 4. SUMMARY OF RESULTS & RECOMMENDATIONS The condition of Clam Pass was documented by monthly oblique aerial photography, three complete bathymetric surveys, shoreline mapping and tidal flow monitoring throughout 2016. These datasets were processed to monitor the condition of the pass. Table 1 summarizes the design criteria indicators based on the November, 2016 annual survey data. Table 1: Design Criteria and Present Conditions Monitoring Criteria Target Condition (Nov. 2016)* Section A—Average Cross Section (square feet) > 300 475 Section A—Minimum Cross Section (square feet) > 250 315 Section B—Average Cross Section (square feet) > 450 595 Section B—Minimum Cross Section (square feet) > 350 430 Section B—Volume in Template (cubic yards) < 2,500 2,250 Section C—Average Cross Section (square feet) > 450 920 Section C—Minimum Cross Section (square feet) > 350 510 Section C—Volume in Template (cubic yards) < 4,000 210 Annual Tide Ratio—Marker 4(2016) > 0.5 0.66 Annual Tide Ratio—Marker 14(2016) > 0.5 0.65 Monthly Tide Ratio—Marker 4(November 2016) > 0.5 0.75 Monthly Tide Ratio—Marker 14(November 2016) > 0.5 0.74 Seaward Extent of Ebb Shoal (feet) > 250 390 Ebb Shoal Area (square feet) > 200,000 245,000 *Unless otherwise noted The condition of Clam Pass at the time of this report (November 2016) is stable. The maintenance dredging completed in early May, 2016 prepared the pass to weather the passage of two tropical storms during the summer months. With each passage the hydraulic efficiency of the pass temporarily declined, followed by a subsequent recovery driven by the relatively free-flowing channel. Physical monitoring indicates that Section A has shifted to its typical alignment and that Sections B and C have responded as expected. Hydraulic monitoring indicates that the tidal exchanges are as expected and tidal ratios are above critical levels. The following recommendations for monitoring on a continuous basis are: 1. Tidal monitoring should continue to be collected and studied on a monthly basis as it has been shown to indicate the state of hydraulic efficiency in the pass. 2. Continue to evaluate the tidal range ratios of the bay compared to the Gulf to see if the ratio descends below 0.6 over more than several months in succession. 3. Continue physical monitoring by conducting an annual hydrographic survey. Interim surveys may be required depending upon storms and tide data analysis. 19 Agenda Item#5a Page 22 of 51 APPENDIX A Clam Pass Monthly Aerial Photos 2016 �n �n U) 0 - a N Co a) ; • " t Q0-7 11 s a" k. g .t*-1,p. ex .+ ,,0'.-' '"ri ro�r1 =#`p 3; �' � #�' $� � �` t I � k @ ,k ` 0 • C co es C n a) t A �: fO L I''l .ti ff.-,.. L Cla cu �' a� �"w �''� ',`�� , � ..'�a ° i"N. 4,0::+::ilii!''''1?'C'F'iii.i'''',':.' \ .,'''',it' , d JD CD 0.0 ' 'VOW* Mq {y ems. s £" j. .M �5 y .. �e ✓ < x A fv #,. p 't; ` ` 'i f f• �6 0 To � _ k O i r co U � � .. �A is fes } A r o o ,.„.„ , ,,,,., ,,:s.., ,, 0- co ',.^,. ., ,,,,,‘`'`.!^5,'....''''''''' ''' ; ,.. k, ,,,,,,,,. ,, ,.,.,... ... , . . ...., , . . , ,. ,. , .. ...,,, ,. . . , ,,,, . ., ,.. ........ Ss`A F hr'°. 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E 03 Cla c Q mm r... •• ..•t.N `� C'"`11 ff VV Fl —R _... . r.¢7 — . 4-f"! �... _N .a.. _rsi w n —('V �... ..� . ."... •• —ry '.... . — —N N f V .... ....+q _.. : —R .......:....4.q ,. • --F3 •_.... ....: � o . ca .r....' —R ..... . ...._R ...... —8 —R c c _. ; .m coos 0 N N • CO 4-0O CI- o �,o o + oco _ U i-1 L 40 Q 1 1 1 1 11 1 1 1 1 ( N O tV O N O N O N O N s N O N s N O N O M^J Y 101.1e141 11 MAW 9Z meW ZE HVeW Agenda Item#6a Page 1 of 4 TURRELL, HALL & ASSOCIATES, INC. vMARINE &ENVIRONMENTAL CONSULTING 3584 Exchange Avenue, Suite B •Naples,Florida 34104-3732 • (239) 643-0166 • Fax(239) 643-6632 MEMORANDUM TO: PBSD Clam Bay Committee do Neil Dorrill FROM: Tim Hall DATE: November 29,2016 RE: November Report on Mangrove Die-off status DIE-OFF STATUS The mangroves this month appear to be holding their own with no appreciable increase in the expanse of the die-off area. There appeared to be less yellowing of the leaves than I had noted in September and October but the ground trothing showed higher water levels than had been present in prior months during our field visit. The super moon this month did create some higher than normal tides that probably contributed to the higher observed water levels. The September and October reports both estimated the dead acreage at around 11.46 acres. Based on this month's aerials and ground level reconnaissance it does not appear that many changes have taken place in the past 30 days. The seedling recruitment going on in these areas is surviving though it is not as prolific in some areas as I would like. The November die-off estimate is approximately 11.66 acres but the difference could be associated with slightly different phot angles. I did notice a small area further south(see attached photo)that I have not noticed previously. It is located about 600 to 700 feet south of the Marker 36 facility and just in from the beach about 200 feet. I have not been able to get out to that area yet but will have an update on that as well in the next month's update. I am still reiterating my concern regarding how the system will respond if we get a strong freeze or frost this winter. There isn't really anything we can do about it except wait and see,I want to make sure that everyone is aware that we may not have seen the final extent of the affected area yet. As I stated previously,because the trees are already stressed,they could be more susceptible to cold if we have a hard winter. We will keep monitoring and coordinate with Jeremy with respect to the monitoring plots he has established within these areas. Sincerely, Tim Hall Senior Ecologist Agenda Item#6a Page 2 of 4 -id+, Area of concern east of the Strand (October) -if mss 4n.( _ T�; '•� * A Area of concern east of the Strand (November) AgendPa•ea Item3#6aof4 New stressed area just south of Marker 36 a w In CV ,i15:..\1::1* l'...,' ,. -"; l'.,‘, ,',,.,, Z '4,40:1 ' ,...... . t, , ; 4.-iti 1,‘ 1 Z Z Z ULL LL :11111111 N 14 ' 1 t w a ,, 00000 �. a Q 95®®S® ° + w 111 m CCI ..t h 4 • a_ W Oi _,",,';',ii'"''' t, W O 0 r F ' to Z �T , M ` J " ,,,,. [I] 0 \--------1,.....".... 1 • i ______\_,_--) i_-n ` i:t 1 ` -. Q , w ., ,, ____ ,. c. , . . w ! .,... ,... , ..,,,,..„.... ..........,..„..,,,..,,.._,•;,,.--,:,..,:-. .:,-,...,.--....-•,..,,.:,:„..,..,,;,-,„,„,,,,,,,,7„,.,.,..„... �-� o It ix O ILI iiii I r / I `i ffi 0v.01, n k lo►� �� ' x{y4,`. C 1 63 f-- ,_ '''‘\'' .'t 7,5 a C i 'j4 w w T M O k " I ,V * ; 1r 1 7 � .it ,` J L ,�ei � P:19845 Clam Bay 1DRAWINGS\SHEET\DIE-OFF_MONTHLY\2016-11-22-DIE-OFF.dwg SPET-NOV OVERLAY 11/22/2016 Humiston & Moore Engineers I ClamPass-TIDE Agenda Item#6b Page 1 of 1 CLam Pass Tide Monitoring- Click here for Maintenance Dredging Project details cuifof Mezrco MARKFR 4 MARKER 14 MARKER 26 li Glr i'P'i • Monthly Time Series 2016(Click on Thumbnails to Expand) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec NA Gage/Gulf Mean Tide Ratios-2016 0.9 PASS T.S. 0.8 DREDGING T.S.'C.OLIN HERMINE 0.7 . 4, ✓ W .4 0.6 IL Marker 4 m 0.5 Marker 14 0.4 Caul Rator `- - ..,_ .. .. - Marken Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec a a u. Mean Low TideTime Laq -2016 300 _ PASS DREDGING FL_ SW 0 ■Marker 4 lila,_ Jan Feb Mar Apr May Jun Jul Aug Sp Oct Nov Dec Definitions: Mean Tide Ratio: ratio of tide amplitude of gages over the tide amplitude from the Gulf of Mexico, 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 Laq: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/clampass-tide 11/30/2016 g 4 s� ...,,,,,,, i 45eneka I.4-e64/ '44)C. >A , 't its �,� _ • i `oQ Q. x:-750 ) . - 3.000. - �� • 3 �.� - 1 `arfr t '�f1S5�` •,..4 R t s d.\"tea r1 '. 3 4 Xa�:. . c ' ` "� ,„ ' l , we ,w i'' Upper .�,' ,' r v S. ,,,t. ..- it, - f.,y Clam , BaY ex' > v A ,,4'A' t' K a < 'y•�. , • SHADOW LAKE'LN I- '1 - - _ t Yq. 4 `- 'T URKE YOAK LN, t R, �'' - r , "S ,.ii , 14je c — a •••°-',.,,, a L OWWOO•LN > y ,li . � ' � ,1,-..-„,.;k` s fir. r" 4"`l. , v .r +n. , ,ate D y :. fC`; � '6,6,d(. .� -rr „MYRTLE RD _. yy �1 < *-I nifp94., 'is`•x vy i ' - ^tea '''' a Inner 'iI'; L Clam E. Bay '.,'�,c,a+'�•� �k ti y 'b ... .' } St g „.,,sk •r .' I a- `y E3 GULF PARK DR} „,.r ' ., • .5 - .41 S' f "`MAHOGANY DR 4,1,1.74:/'..r " e' 4 r t�-. o0 .x 1 4 Gulf k'I 3 ' , i of 4 '4' .x�ti-SYS , m Mexico 6;* t t a ,:3t' ,' .. -„ . m 4 ,00 .� , n'. r 6,Q'. U, , . { • • r OPOP� ,� a s 1. o. • tt) i ,, a- a II4 . �i8 ) oF# fi .. J ,c,4„c - s a u A .k g, .4,44,:.-3i, x { h� �. ”' Z O; ,,ff al\} I •° • Outer i Clam .P � 4t. _ -r r, i , 4 ''`' ':At''r• t' ' 4* ' Bay 0 WATER LEVEL LOGGERS (3) L SEAGATEDR PiNERIDGERD t : >v jLL S {';i,c TELLo b n ;? . #. E moth To o PELICAN BAY EARTH TECH ENVIRONMENTAL, LLC �J WATER LEVEL LOGGERS 1455 RAIL HEAD BLVD, SUITE 8 r NAPLES. 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W.. .r, 'm'1 ...........,,.F N - 1 -N lV [V . } ...._N _... ,..N ._ ...N r r N ' - -. ,..W • -} co CO • p .+...LO - • - - —e, r — I"'/ W O O • w a ' E N —N - .....H ... ...O _ .r O —g — ....—8 —.... —8 —...........—8 - 8 +,. .g -• —g —. .a.g ,._ r..g -. ....g - . .r8 —O }' O I Ii I I I I I I i I I N O N O N O N O N O (V O N O N O N O N O inch y Mpotw pl.,ai,gW KAMAN zE 451.1e1A1 1 wo "t ® ' 'Agenda,item 46" • Page 1 of 7 01.37.7.600 199011A1 -3 Ali II: 49 00 1 526 000052 COLLIER COUNTY RECORDED OR BOOK PAGE REOegg DEED OF CONSERVATION EASEMENT PRM DOC SSS INT _ THIS DEED OF CONSERVATION EASEMENT is made this 12th day of IND April , 1990, by Westinghouse Communities of Naples, Inc. having an address at 801 Laurel Oak Drive, Suite 500, Naples, Florida 33963 and Contessa Development, Ltd., having an address at 801 Laurel Oak Drive, Suite 500, Naples, Florida 33963 ("Grantor") , in favor of Collier County, Florida, ("Grantee"). Grantor and Grantee are used for singular or plural, as the context requires. WHEREAS, Westinghouse Communities of Naples, Inc. and Contessa Development, Ltd. are the owners of certain lands situated in Collier County, hereinafter referred to as the "Property", more specifically described in Exhibit "A" attached hereto and incorporated herein by this reference; and WHEREAS, the Grantor has undertaken the filling and development of approximately 2.4 acres of wetlands adjacent to the Property for the purpose of creating access to Grantor's upland private property; and - 'kk IN, .T `Av,- WHEREAS, consent(to fill and develop '' reage for access was granted by the U.S.. Army corps-of Engineers (C s) and the Florida f Department of Environment `Regula. ion( ER); and WHEREAS, the C a toren ''on it at on of t e consent of the Corps and DER o uvo ak& tiff )f lin . an development of this acreage, is agreeble to and desirou of 'stab establishing and securing the enforcement ofrpetual consery n e . i/ NOW THEREFORE, n., btlsideration,,o A> e sum of Ten ($10.00) Dollars and the issuance ,gi s 2 .consent to fill and develop toapproximately 2.4 acres of wetlands for access, there is created, declared and established and the Grantors do hereby grant, bargain and sell to the Grantee a Conservation Easement upon the adjacent 11+ acres of the Property described in Exhibit "A", which shall run with the land and and be binding upon the Grantor, its heirs, successors and assigns, and remain in full force and effect forever. 1. It is the purpose of this conservation easement to assure that the Property will be retained forever predominately in its natural condition and to prevent any use of the Property that will significantly impair or interfere with the remaining natural, scenic and ecological values of the Property. However, Grantee acknowledges by acceptance of this instrument that approximately 2.4 acres adjacent to the Property described in Exhibit "A" have been filled to create an access road to upland development areas. Received$ ,....5-5- DocumentaryStamp Tax P Received$ // Class"C"Intangible -l- ki Personal Property Tax COLLIER CO Y CLERK 0 RTS BY DC > ,t1 5t11}Tj? f t„.. 1 A It v'p- i 21. fft i-i i • r , l+ 1 11:1 I � ''''4`'';4.:� ;1`,�-t 4�.� "Y W�f; "{t dYs 4 .01%4..43 �-�., 51 ,f 4. ,fi ,:Agenda Item#6f-1 '`} `t , Fp ;fie<of 7 .• ' 001526 000053 OR BOOK PAGE To carry out this purpose the following rights are conveyed to Grantee by this easement: a. To identify, preserve, protect and, in consultation with Grantor, enhance the natural, scenic, and ecological features of the Property, including, without limitation, topography, soil, water, vegetation and wildlife; b. To enter upon the Property at reasonable times to enforce the rights herein granted and to observe, study and make scientific observations of the Property, upon prior notice to Grantor, its successors and assigns, in a manner that will not unreasonably interfere with the use and quiet enjoyment of the Property by Grantor, its successors or assigns at the time of such entry; and, c. To enjoin any activity on or use of the Property that is inconsistent with the purpose of this conservation easement and to enforce the restoration of such areas or features of the Property that may be damaged by any inconsistent activity or use. 2. Grantor states that the following uses and practices though not an exhaustive recital-•tsf ►4on�s tent uses and practices are inconsistent with Gao �s iitten T � he purposes of this conservation easement'en cp/are, therefore, ited by it: a. Constr C on._or placing of b ldi gs, roads, pilings, signs, billboards or/advertising, utili ies, r ther structures on 1 a. or above the ground; sr. ., zi b. Dpmp gl or, ihcin f �o' o her substance or material as lan ,fiI \,,Ari,dgfR fl tor 4a trash, waste or unsightly or offetE V! materials; ,,C /"�i c. Re o 4 or destructioi r n v trees, shrubs, or other vegetation, excp for trimming a keor may be permitted by DER and the Corps; Q ` d. Excavatio , dgi o removal of loam, peat, gravel, soil, rock, or other -ma a'1--substance; e. Surface use except for purposes that permit the land or water area to remain predominately in its natural condition; f. Activities detrimental to drainage, flood control, water conservation, erosion control, soil conservation, or fish and wildlife habitat preservation; and, g. Acts or uses detrimental to the retention of the approximately 11 acres of wetlands area. 3. Notwithstanding the foregoing provisions of this paragraph, and in accordance with the permitted uses authorized by that particular Declaration of Restrictions recorded in O.R. Book 966, Pages 1830 through 1840, of the Public Records of Collier County, Florida, which Declaration of Restrictions was made applicable to the 570+ acre conservation area immediately adjacent to the Property and now owned by Collier County, Grantor reserves to itself, its successors or assigns, the following rights, subject to obtaining any and all permits required therefor: -2- ', e 1 iSl y t.1 ;4 �7.i=,% y}.k t,` :.,r.� " L3 fx r x 7 �t at Agenda Item#6f-1 WIii ,. �f.�.fid. • 001526 000054 OR BOOK PAGE a. To construct and maintain native trails, including boardwalks. b. To construct and maintain boat trails. c. To construct and maintain boat docks not to exceed 500 square feet per dock (non-commercial boat launch facilities - no permanent docking) . d. To engage in other activities for recreation, conservation and preservation when approved by the requisite authorities, including the Florida Department of Environmental Regulation or its successor. 4. Grantor reserves to itself, it successors or assigns all rights as owner of the property, including the right to engage in all uses of the Property that are not expressly prohibited herein and are not inconsistent with the purpose of this conservation easement. 5. Grantor agrees to pay any and all real property taxes and assessments levied by competent authority on the Property. . 6. Grantor intends that any costs incurred by Grantee or Grantor in enforcing, judicially,__or otherwise, the terms and restrictions of this was ent, including without limitation, costs and any costs of restoration necessity ecY by the violat �' the terms of this conservation easement sha'l'l"`"bn-korne by the p evailing party. 7. Grantor ntends ' hat, enfo cemen o the terms and -- provisions of thelcone for"ea's f a ' at\the discretion of Grantee and that 40 fO eYegraei--mo ba f pf the Grantee to exercise its rigfi s clew obi eves_ f 0,) breach hereof by Grantor, its suco rs or assigns siii,.11 nc)t /i, yeemed or construed to be a waiver aantee's rights = e inse�Y)in the event of any subsequent breach. `°. V ' 8. Grantee agre a"'t..,.xt will hoWtis conservation easement exclusively for conservatio{t i dpe e 94 td that it will not assign its rights and obligations under` hie conservation easement except as provided in Section 704.06, Florida Statutes. 9. If any provision of this conservation easement or the application thereof to any person or circumstance is found to be invalid, the remainder of the provisions of this conservation easement, and the application of such provision to persons or circumstances other than those as to which it is found to be invalid, shall not be affected thereby. 10. All notices, consents, approvals or other communications hereunder shall be in writing and shall be deemed properly given if sent by United States certified mail, return receipt requested, addressed to the appropriate party hereto or successor in interest. 11. Grantor agrees that the terms, conditions, restrictions and purposes of this grant will be inserted by it in any subsequent deed or other legal instrument by which Grantor divests itself of any interest in the Property. -3- i 1111 .: p I ,,;:,,t,,7 ; r,,1 .,07400„,,e,,,,...,,, _ii' _;. Agenda Item#6f-1 Pa e4of7 . 001526 000055 OR BOOK PAGE This conservation easement may be amended, altered, released or revoked only by written agreement between Grantor, its successors or assigns, Grantee, its successors or assigns, the Corps and DER. TO HAVE AND TO HOLD unto Grantee, its successors and assigns forever. The covenants, terms, conditions, restrictions and purposes imposed with this grant shall not only be binding upon Grantor but also its agents and assigns and all other successors to it in interest, and shall continue as a servitude running in perpetuity with the Property. IN WITNESS WHEREOF Grantors have set their hands and seals on the day and year fiys .abnv t i. ten. _ `^Ad" 1 . yam-4'-----31A = WESTING U E COMMUNITIES OF Witness Isi- •�"1 A•LES, NC\, a Florida ` ,..--\ Co porat ion \ vamp 71011. - ' ` !,B - ��- - - +U,'r; �J. G�r a .d J`' - Witness 9 r g st R'cco • ,„5",::::-. �°i -__Um.,�r°/ / d ' S yip, i--" ice Presidey�Ci y,,,+ ` J fi! (C p/. ate Seal) a `7 �f $ ( �� t f r 1► �.. !.w:... CONTE S c';DEVELOPMENT, LTM,,,,::.,.....,;:,-,,' Witness ��# r &N ESSA DEVELOPMENT, > t}tJP" -.:;‘•••' � '� � - 1,� 5 General Par •-r �'" �...$ 13y: �. \ LQ, -13y: witness CY. Woodward, Vice President I 1 (Corporate Seal) STATE OF FLORIDA COUNTY OF COLLIER Before me personally appeared August W. Rocco , as Senior Vice President of Westinghouse Communities of Naples, Inc., a Florida corporation, to me well known and known to me to be the person who executed the foregoing instrument, and acknowledged to and before me that he executed said instrument in the capacity and for the purposes therein expressed. WITNESS.,my hand and official seal, this 12th day of April, 1990. )•••,,'":"••., - EJdt1 _ 1— , (S (,, . Notary Pub i c ';: `,d My Commission Expires: v��•'�.. - naP V FORM SLATE OF FLORIDA. -4- KT COSOUSSOR Ellir.M JAIL IS. SM �k j� - . t`it'if". a "` bA c rt.: • .. ��MIN g y , Ltem#Gf 1 • 001526 000056 OR BOOK PAGE STATE OF FLORIDA COUNTY OF COLLIER tRKAEMRt.�04JylWO V« Before me personally appeared , as/President of Contessa Development, Inc., the general partner of Contessa Development, Ltd., a Floridalimited partnership, to me well known and known to me to be the person who executed the foregoing instrument, and acknowledged to and before me that he executed said instrument in the capacity and for the purpose therein expressed. / WITNESS my hand and official seal, this /2 day of uw , 1990. jJ ` l lAJ • (SEAL) Notary Publi L . r My Commission Expires: ilC41PA YO1A91 PUNA 5141E M RE CallISS10Y Clv,PAT 73,1791 • MG1GW IdPU GEXCEAI 1MS.M. • / ,✓ y { NV1- 0 OA • Y • • • • • This instrument e.ared by: Robert W. McClur 0-mq. 801 Laurel Oak Duite 500 'f;' r0� '11, • Naples, FL 33963`~e \ • 1�,/ 813-597-6061 • . HE ci • • • • • • -5- • • • p y lyt 1r„ i 4Z 6 Agenda Item#6f-1 001526 000057 OR BOOK PAGE LEGAL DESCRIPTION Conservation Easement Parcel One and Parcel Two, Pelican Bay Unit Eight, as • recorded in Plat Book 15, Pages 27 through 29, of the Public Records of Collier County, Florida. • • • • n 7111Y. 11 1-4 • • • • • EXHIBIT "A" • • • • :jam y ,. 4 i Agenda Item#6f-1 1+,71'. j,` .7�"t y .,. °^,,,: r5� syr. ,,r,, s„,.- „t-t Page 7 of'7 4. :.,. , ,, „ , , �4. t�y, 1-+ • s . I a , 1�y€ :..4.,,,,.,,..:., r , , • s,. e &4:10 ' i o_ . tit i PO C CO S F O N 6 0 rn a r: I 3 af• o u 5' ) d;t W>:t - t u O V. CO 111.-)...,,,,4 � .. `' j f �ti U Q I-- r ?lF r..t •. • 6 ry • i 13 [ Cn �® - I ;" 0 N;' �;,.�11- 1.;1. Nom j' Y i'I i.4sU— fill . ,n - U lib; I . ?�WN i".\ itifdilA.' . .l�: . G , '!-ie,!,!...",„ • W 6 L W 6 U W a� i o JIW •• _ \ S t f .OI Intl r 1 . • SKETCH TO EXHIBIT "A" a6,,a`yi'•Fn4* so§ �S .c\ �,oc1GcT CJ-pFC" tC```•4 \ v I 1tom':, r..'61'14It ixF Agenda Item 6f-2 Page 1 of 6 From: Tom Barber Sent: Friday, December 16, 2016 2:08 PM To: Jim Carr <jim.carr(c�abbinc.com> Subject: RE: More Bay Colony Dr As-Built Plans/Conservation Easement Lisa, the Unit 8 plans show the rock trench water quality stormwater system running down the eastern side of the road, based on the cross section shown below runoff from the lots and road will sheet flow into the rock trench system and be treated prior to outfalling. COLLIER COUNTY COASTAL CONSTRUCTION CONTROL UNE 19T4.�4 I E 32ETAMING I WALL W t SCUPPERS FINaSHCO FLOOR 20 0 NOVO NININUM vARIES ROCK TREND.' TRENCH ( I SYSTEM I TYPICAL LOT SECTION FOR STRAND . '1 Note 2 on plan sheet 2 calls out the areas used to calculate the water quality treatment, see below: 2. DRAINAGE AREAS USED IN WATER QUALITY CALCULATIONS ARE AS FOLLOWS: a. STATION 43+45.76 TO 62+01.89 (APPROXIMATELY) ROADWAY CORRIDOR ONLY • 2.16 ACRES +. b. STATION 62+01.89 TO 89+00 (APPROXIMATELY) - 4.41 ACRES. Agenda Item 6f-2 Page 2 of 6 Below are details showing the design of the rock trench system from sheet 17 of the plan set. �a I x e'.3e AL•S#3 I r. -=r s3 4 gads. JCM+z.„ acs... , c„,9 St ^,n o 4:'. :� =-{,ilii i, " 9 J C= t * ...e 9 I te ._, ».. �� ._ . • ��. .„#,. a , . i ''reF i q # y►�I C� C .. .j z„. T----, .:rvowr dt • ' iv $a E? Cd 55 '-fog,.01,0* 'Pt) ` -� to Vita lir ,EL•23D ;; laW.cl. -..w*+ \ �.G...._... °'_y.9 COM G*.Welrig.M M 4TH X�S4K 44. <. 1Ai lis{{WAWA 3 , SECTION A-A PLAN x B :%"*.: INLET CURB TRANSITIONS ?' NT$ Farti.4to TRADE tL.541'-"-, D '',90,4404 ""'4"'"' YFrW 1 tib OR STA►w1,E'S 1.3.12'1.0400014 °.0-, :4' tows.,._. srtta OR t003%. ,. ,, d a EI p' ...r (III GLEAM 3AI D rrc . .aiV�r w' n ` ® 0 I7 C 11 Mcrslt : ":' -- 6 it 12'KRT.P9Pf $tµCTON D-D SECnnoN c-C .Y.•es . ROCK TRENCH DETAILS NTS PPAN I ID , Agenda Item 6f-2 Page 3 of 6 The drainage system is interconnected with grates typical being around elevation 5' NGVD and inverts around 2.8' NGVD, the system is typically flat requiring stormwater to percolate into the ground. From the plans we have and from site observation the Strand system then connects into an existing inlet to the north and does not have a single point pipe discharge into Clam Bay, but instead is required to percolate into the ground where water quality treatment occurs. There are also several small bleeder pipes at the base of the wall and several 4" PVC scuppers higher up on the wall that would allow water to drain out in the event of road flooding. (See section from the plans at end of this email). These 4" PVC scuppers are evident in the picture taken by Tim Hall. WALL CONSTRUCTION LINE MIN.40' EASEMENT G'O"MIN. 2.4k 0 PAVEMENT I _4 I 12 4'10" -oo G,-- PROFILE GRADE tta"14 4"x 18"CONC. CURB 4•`PVC --- — 'r I" ASPHALTIC CONCRETE TYPE 5•III G 1/4'/FT S SCUPPER 13I/ LIMERCICK BASE (PRIMED) RETAINING Ali • - ?HALL cv V �/� !Z."! Ceps-TING) �_. 12-PIPE (PERFORATED) !D1 C 4' RUSK TRENCH .••••• EL,4.0 TYPICAL PAVING SECTION NORTHWEST FILL AREA NTS -ISLAND- CENTERLINE STATIONING FROM STA.43.63.85 TO STA,62.501 Thanks, Tom Barber Agnoli, Barber, & Brundage Inc. 7400 Tamiami Tr. N., Suite 200, Naples, FL 34108 Phone (239) 597-3111 tom.barber(aabbinc.com I Ili n N a if o a.,‘ \ ',1,.\ 2 2 a3 <3 A \, 2 tit 0 tt .t . . . . 'i' i t. ...4 .. .. I 7 ( :o : ' - - ; t3 Eos - N. � ^g iii d :d.I .', : ".3 E .. I/ 1' ,. 3 5 EQ 3. 33 3: :,, E l.= a tv a" ,a g l s > P g w_ ' : -!` a s a €a s "- : ` ? 6 •;/ Esti . 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M1 Y.. 1 ©I •nn$ LIIII ‘..... I \<SU taNoy . x 1 w.x £ "ao"�,.133HS 3�S...x .... / Agenda Item#6g Page 1 of 27 CLAM BAY SUB-COMMITTEE MINUTES—APRIL 4, 2002 Naples, Florida LET IT BE KNOWN, that the Clam Bay Sub-committee of the Pelican Bay Services Division Board met in Regular Session on this date, April 4 2002 at 9:30 A.M. at Hammock Oak Center, 8962 Hammock Oak Drive, Florida 34108 with the following members present: Mr. David Roellig, Chairman Mr. John Domenie Mr. M. James Burke Mr. George Werner ALSO PRESENT: Approximately ten (10) Pelican Bay residents; Messrs. Todd Turrell and Tim Hall, Turrell & Associates; Mr. Marty Roessler, M.A. Roessler Associates; Mr. Ken Humiston, Humiston & Moore Engineers; Messrs. Robin Lewis and Michael Marshall, Lewis Environmental Services; Mr. Dan Johnson, WilsonMiller, Mr. Kyle Lukasz, Field Manager, Pelican Bay Services Division; Mr. James P. Ward, Department Director, Pelican Bay Services Division; and Mrs. Barbara Smith, Recording Secretary. AGENDA 1. Roll Call 2. Approval of Minutes of the February 14, 2002 Meeting 3. Consultant Discussion Regarding Future Requirements for the Clam Bay Restoration and Management Plan 4. Jim Gage Letter 5. Adjourn ROLL CALL Mr. Roellig called the meeting to order and asked that the record show all members present. APPROVAL OF MINUTES OF THE FEBRUARY 14,2002 MEETING Mr. Werner moved, seconded by Mr. Domenie and approved unanimously, the Minutes of the February 14, 2002 meeting. CONSULTANT DISCUSSION REGARDING FUTURE REQUIREMENTS FOR THE CLAM BAY RESTORATION AND MANAGEMENT PLAN Mr. Roellig explained that many of you have followed the Clam Bay Restoration Project for many years. I bought my first property in Pelican Bay in 1995 and at that time the Clam Bay Restoration and Management Plan was under consideration, As the years went by, the Plan was approved and much of the work that had been contemplated in the Plan has been accomplished. 137 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 2 of 27 April 4, 2002 There have been some successes and some areas that have been a little disappointing. This is not a big surprise to me in this type of a project because I don't believe that anybody had believed that we had found a magic bullet that would solve all of the mangrove problems. There have been some significant improvements. Trial and error is kind of a harsh term, but that is some of the program. We have tried a number of things, some of which have worked better than others. We have improved the interior hydraulics considerably and Clam Pass is in a much more stable condition than it was back in the mid-1990's. We are at a point now where we are not satisfied with the situation, as it presently exists. We do have some rejuvenation of areas that had previously died off. In the beginning this was strictly negative and the die off areas appeared to be increasing, but after the first year we appeared to be holding our own as far as any increasing die off areas. Now there is some rejuvenation and there is a considerable amount of re-growth in the original die off area. We have other areas before us where we are seeing deterioration and we need to solve those problems. In some ways this is a new start and I believe we have done most of what we can under the Management Plan. Now we need to look forward to see where we go over the next five to ten years to improve areas that are still failing. This is one of the reasons that we have called our consultants together to attempt to get on the same page to ensure that there are no misunderstandings of where we want to go and how to get there. I do not expect to find a"silver bullet"today and I do not believe that one exists, but it is very likely that we are going to have to keep tweaking different things until we obtain the maximum results that we can. Mr. Ward introduced each member of the consultant team. At this point in time I believe the staff and Sub-committee are at a sort of a crossroads or juncture, as to where we are going with this project over the five to ten years. We have finished the Clam Bay Restoration Project as defined in the Management Plan and we have seen some significant results in the southern part of Clam, but we have not seen the significant results, as we would have hoped to see in the northern part of Clam Bay. The purpose of today's meeting is to have a brainstorming session between the consultants and Sub-committee as to where we think we should go over the next five to ten years, both in terms of permitting activity necessary for Clam Bay and/or future construction 138 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 3 of 27 April 4, 2002 activities in order to try to preserve and restore the northern part of the Clam Bay system. The consultants are here today to try to come together and provide to you some analysis and recommendations as to where we should go and have an open and honest dialog with everyone as to that process. We will try to put aside some of the political issues we have had over the years with respect of how to do things, or when or when not to do them, and endeavor to come up with some scientific reasons why we should move forward. Frankly, in my mind. I need to be able to put together a budget that I can present to you next month for where we are going with the Clam Bay system. We have been in this maintenance mode for the last year or two and I think it is time to step up to the plate and really look at those activities, along with our construction activities, and move forward with this process. The consultants do not have a preplanned presentation for you. Mr. Turrell and I have been having some ongoing discussions over the past few months with respect to this issue and we brought them here today to talk about a myriad of subjects and where they believe you should go with respect this project over the next"X" number of years. Mr. Turrell explained that we have Mr. Roessler with us and he was involved in Pelican Bay before it was Pelican Bay. He will tell you that these areas of dead mangroves were already dead and dying even then. Now of course, we have to look at them so it is, "Now look what we have done, we have to fix them right away". It has become a very technical and scientifically challenging project and over the last couple of years I believe everybody was kind of trying to bring down the costs a little. In light of how complicated an issue this is and how scientifically challenging it is, I don't know if you want to be doing that. I believe you need to throw, not just the resources we have been throwing at it, but more. I believe we need to spend as much time on this as we can now, whether that is through studies or time,and I think it is worth doing. Mr. Werner stated that we had a discussion at our last Sub-committee meeting and it is my understanding that you are the Project Manager. Are you willing to continue to serve in that capacity? Mr. Turrell replied, "I am, but as I told some people early on in this, I am not a politician, I am just an engineer". The day this gets contentious and people are casting blame, I would just 139 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 4 of 27 April 4, 2002 assume not do it any more. We will continue to do the monitoring. Mr. Hall is a very bright biologist and we can do a good job of keeping you in line with the State Permits, but I would be more than happy to have someone take over the role of overseer of all of the consultants. I don't have the answers and I don't think anybody does, we are just trying. Mr. Werner stated that I guess my basic question is, we have spent a couple of million dollars on the Clam Bay system over the past few years. have we spent enough money or do we have enough evidence now that we can really have some sense of good direction on what we are going to do over the next five to ten years to help restore the system, if it is restorable? Mr. Turrell replied, "We certainly have not wasted $2,000,000". There is certainly enhanced flushing and the mangroves in the main die off area appear to be doing a lot better. We are hoping with Mr. Lewis' cuts that as long as they are maintained that the small mangroves growing in the main die off area make it through the summer, which they have not done in the past. Thanks to Mr. Lewis' cuts we are hoping that those areas stay dried out enough that those mangroves grow. I believe they will as long as we keep the cuts maintained, which is critical. In my opinion, Mr. Lewis' cuts are the biggest single, positive thing that we have been doing. I believe that the other consultants also share that same opinion. I have asked Mr. Roessler to go out there with a completely open mind and tell us what he feels we should do and no ideas have been instilled in him whatsoever. He can tell you for himself, but I don't believe he has seen any fault in the road that we have gone down. Mr. Turrell continued, "What do we do from here"? Well, there are things like the reconnection at Vanderbilt Beach Road, which has been poison for years, but it is still there and there are ways to get more fresh water out of here that we are not studying right now and maybe we need to. Mr. Domenie stated that I feel you have indicated that we need to throw more money at it; you must have something in mind to make that statement. Mr. Turrell stated that we already have WilsonMiller looking at diverting some of the water to the south and you can do that. There is another plan where you can throw water to the north that would involve sending it out Vanderbilt Lagoon, which the first step in that process is to study 140 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 5 of 27 April 4, 2002 it. We have a proposal from some time back, where Mr. Humiston and Mr. Lewis would have been involved with the hydrographics. It is a long and expensive process, so I think the Committee at that point chose to go down the road of diverting the water along the berm, which is what WilsonMiller is doing right now, which was not a long and expensive process. Can we do more? Yes, we could be looking to the connection to the north and that is not even my job. I am happy to help oversee that and make sure the proper people are making that analysis. Mr. Domenie asked if new permits would be required for that northern connection? Mr. Turrell replied. "Yes". I can tell you that I did talk to the Army Corps of Engineers and to the Water Management District a year ago on behalf of my neighbors in Vanderbilt Beach, to see how that woud fly and at that time it appeared as no big deal because it used to be connected, so all you would want to do is reconnect it right'? They said they did not see a problem with just a reconnection, but who knows, the world of permitting is why I have all the gray hair that I do. Mr. Roessler stated that we started working on Clam Pass when we were at the University of Miami before 1973, when we got into the Tropical Biolndustries Consulting business. We worked on the biological part of the Impact Statement for the mangroves of the Pelican Bay development. Part of the studies that we were involved in doing was with the mangroves and the water flow into and out of the system. We were trying to look at what the productivity of the mangroves was, what the export of organic material into the Clam Bay system was, how that got out into the Gulf of Mexico and looking at the dynamics of supporting a viable fishery and the shrimp and fish off shore. One of the first things we discovered, much to our surprise, was that the amount of water going out of the Clam Bay system into the Gulf of Mexico was much more than the rainfall that fell on the entire project. The water had to come from somewhere east of the Tamiami Trial in order to account for what was going out into the Gulf of Mexico. This was a shock when it showed that there was a great amount of water coming from off-site on to this area and then into the seep zone, which is now the spreader canal, and out into the mangroves. We also discovered that the productivity of the mangroves was generally very high and in some areas very stressed and found that in the northern area, where the restoration is now going on, was 141 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 6 of 27 April 4, 2002 stressed back in the early 1970's. There were large black trees that had died and the area was very obviously under a great deal of stress. Part of the productivity that was occurring there did not get out over the berm into the bay system and out into the pass, which was one of the reasons that permits were granted for development on the beach front area. Mr. Roessler continued that one of the things to be concluded out of this is that if there was a great deal of productivity, very little export then there was very little terrestrial insect life. It ends up that if this continues, a lot of the productivity that gets on the ground forms soil that blocks the water flow, reducing flushing and the succession of red mangroves into black areas and into an upland community. After our studies and development, there was some early ditching done under Mr. Heald's supervision. Mr. Roessler stated that I have been asked to evaluate some of the new die off areas and several of the ones to the south were obviously lighting strikes. You would find a tree in the middle that was shattered with a spiral band around it that has die off. Experience on the east coast with some of these lighting strikes shows that there are changes in the Eh and pH chemistry from lightening hitting areas with salt it in and succession for a longer period of time than just immediately after the lighting strike. In the larger area of middle Clam Bay we observed that there wasn't obvious reasons for the kill. If you look at it, it is of a higher elevation with a lot of leaf litter falling, which indicates drying out, although pneumatophores are generally paraphrasing roots and the top inch or so stays above the water. Many of the pneumatophores out there were dead. My guess, without having the experience of coming here as often as others, is that there is flooding that gets deeper than the pneumatophores and may have caused some of the killing. Possibly when you get some storms on Pelican Bay or to the immediate east the water is now coming in at a higher rate than before development which could temporarily cause flooding. We also noted that there was a lot of green algae, which would again indicate some flooding and may also indicate nutrient build-up, although I have no data to support this. There are a number of reasons why these kills may be going on yet. My conclusion was that we still needed to look at the hydrology and what is happening on a day-to-day basis. We need some monitoring staff gages that measure water height to get an idea of water depths over a long time 142 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 7 of 27 April 4, 2002 period and which would allow you to plan. All of this has to do with water, either not enough getting in through the tidal exchange or fresh water impounding for a while. The tidal ditches that Mr. Lewis has been working on are surely in the right direction. My feeling is that without the water level data we just don't know and that is one of the things that is being talked about as part of the new research program. Mr. Werner stated that Mr. Roessler appears to believe that the real cause of the die, off other than lighting strikes, is not having an exchange or too much water in the upper system. Mr. Roetlig stated that when you talk about a lot of fresh water input, you are talking about the ground water inflow and not predominately the surface water inflow, even back in the 1970's. Mr. Roessler stated that is right. The inflow was groundwater. When we were studying it the interceptor was a bay head swamp. The water would percolate out of the soils and as the bay got deeper it woud permeate up into there as groundwater. Mr. Turrell asked if there was a connection to Vanderbilt Beach to the north, when you were studying that? Mr. Roessler stated that it was wet up there, but there was no flow connection at that time. While we were working on Clam Pass, Midnight Pass as it was called then, opened and closed during those studies and was a storm driven pass. The area impacting middle and upper Clam Bay on a low tide would be dry. Some of the connections were kept open only by our traveling them in an outboard, so it was closing up and isolating them at that time. Mr. Roetlig stated that I asked that question and that if it is largely a groundwater inflow there is no way that is practical to head that off. If it was a surface water flow, it could be diverted some how. I just want to make sure everyone understands that if we have a groundwater inflow into a large area like that, there is no practical way to stop it or divert it. Diverting the inflow can solve a lot of hydraulic problems, but massive groundwater inflow, as has been suggested in the past, is not possible to divert for all practical purposes, before it gets into the system. Mr. Roessler stated that it is not possible to stop groundwater from coming into the system, but part of the problem may be that the water is coming in unseasonably. When you 143 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 8 of 27 April 4, 2002 have a winter storm and with the pavement on the property, now it is coming off as sheet flow and there are only a few culverts that are leaving it into certain places instead of it being spread out. This may take it in and with the building of dikes and the like, may isolate and make pockets of water that did not used to occur out there. There may be ways to reintroduce the water into the system. Mr. Roellig stated that with the groundwater situation you have to realize that the elevation of U.S. 41 is +19'. If you have ever been out to the Corkscrew Swamp area they have water level gages and it is also +19' above sea level. Basically, what we have here is an extraordinarily flat area and when you get to U.S. 41 we have one of the steepest gradients anywhere when you go from 19' to the Gulf of Mexico in about a mile. There is a tremendous amount of water back there and this is one of the problems that we need to look into. The actual groundwater flow into the system is going to be hard to stop because the groundwater reservoir goes back so far. Mr. Turrell stated that pre-development, when this was first being studied, there was groundwater percolating up and at that point it becomes surface water. Even though it is coming up out of the ground it becomes surface water and that could be diverted in some of the ways we are talking about. Mr. Roellig stated that it could be diverted, but not intercepted. Mr. Turrell stated yes, catch it when it wells up to the surface. There were two studies, one by Gee & Jenson and one by Missimer & Associates, which were radically different as to what that real number was. We ran across that when we were doing the initial studies, so no one really knows. Did you get a feel that somebody knew conclusively? Mr. Roessler replied, "No, actually we had hopes that when we did that study that this would be a great scientific contribution". The fact of the discrepancies on the two studies on the water levels kept us from ever doing anything except focusing on mangrove productivity. I am not an engineer and don't want to get into an argument over which of those two studies were correct, but both studies showed that the water had to come from off-site to supplement what was going out through the pass and they were different by order of magnitude. 144 CLAM BAY SUB-COMMITTEE Agenda Item#6gPage 9 of 27 April 4, 2002 Mr. Domenie stated that about eighteen months ago, either Ms. Worley or Ms. Essex spoke about the groundwater and there was some thought that when the Strand was built that compacting the earth for the road plus the high rises may have stopped some of the groundwater from reaching the Gulf, is that correct or would groundwater percolate into the Gulf eventually? Mr. Roessler stated that is possible, but if you go across Clam Bay and up onto the beach there is probably some flow back in from that side back into the system, whether you are talking about a deeper layer getting out into the Gulf, I am not that good of an oceanographer. Mr. Turret! stated that it should to be pointed out that for thirty years there has been scientific uncertainty as to what is going on here. It is a very difficult scientifically challenging project. I want everybody to remember that as we start talking about other studies or whatever else and I do not even need to be involved in that. I am perfectly happy to manage it if you want me to, but any one of these fellows could take over and I would be perfectly happy about it. Mr. Lewis stated that as history to the freshwater discharge, I have been involved in Clam Bay since 1993 and early on when I was doing work looking at the mangroves it was my hypothesis that it was a fresh water flooding issue that had killed the mangroves. Quire honestly most people didn't agree. There was at least four years there where there was a massive argument back and forth about exactly what had caused the problem. Several years ago I wrote a letter to Dr. Varley, after he voiced an opinion at one of these meetings that we were wrong and didn't know what we were doing, and I recounted some history for him. In my letter I told him that in my opinion the management of Clam Bay was like a three legged stool and that you needed to be managing actively and knowing what was going on with Clam Pass and the internal flushing. which included the new channels that I had put in and also the freshwater entering the system. I told him in the letter that we had only addressed two of those issues and that the stool kept falling over and until we got that third leg on the stool we were never going to be able to manage and understand this system. As a follow up to that, I also sent him some diagrams about what I termed "Improving the conveyance of water in this system". As a result of that, there were discussions among the consultants and a proposal prepared to look at the question of conveyance. The proposal included how much of the golf course irrigation was involved, how 145 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 10 of 27 April 4, 2002 much groundwater, keeping in mind this includes the superficial aquifer which can be just a few feet down and can become a surface water problem very quickly. The proposal was to quantify those things so that we could get a handle on it and at the same time address the question of conveyance. There was a decision made to not move forward with the study and to move immediately into looking at the conveyance questions, but today we are still back at that question of connecting Systems IV to III and the question about reconnection to Vanderbilt Beach. Let me say right away that I endorsed the study that has been given you by WilsonMiller and I also endorse the study that Humiston & Moore have put together, which I feel is absolutely essential. We are going to be shooting in the dark for the next twenty-five years until we get a handle on this freshwater issue. I think the consultants need to be encouraged to meet regularly, as a team. That is nobody's fault, it is just that consultants are consultants and you need to tell them what to do. You need to say that the consultants need to get their act together and meet more frequently until this thing is coordinated. It has been somewhat haphazard. Mr. Lewis continued that with regard to freshwater entering the system, it is my opinion after reading all of the works of Mr. Heald and Mr. Roessler, the additional freshwater coming into the system from perhaps irrigation or from other sources was in fact a contributing factor. We took a system that was already stressed and tipped it slightly. It doesn't take much to kill mangroves. We had a scientist by the name of Dr. Karen McKee visit here, who is now with the United Stated Geological Survey. It is Dr. McKee's opinion that even a very thin layer of water maintained over the mangroves and not necessarily over the roots themselves,for long periods of time, can kill mangroves. She has done a lot of scientific work on this over the past three or four years and I believe that is what we really have here. We have mangroves that are saturated, they are wet 365 days of the year and that is not good for mangroves. Mangroves do not exist that way. For the most part, science tells us that mangroves are wet about 30%of the time and dry about 70% of the time, which you might find remarkable, but that is the normal situation. When you look at the tides and elevations, healthy mangroves are dry for much longer periods of time than they are wet. If you make them too wet you will kill them and this has happened all over the world. I have worked in ten other countries besides the United States and I have just 146 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 11 of 27 April 4, 2002 returned from Cuba and Vietnam and it is a very common phenomenon. People tend this think of mangroves as loving water, you give them more water and they love water, they are water plants and it's great, but that is all wrong. Mangroves exist in a very narrow band and too much or too little water can kill them. That is a scientific fact. Our problem is that we have some influences on this system that we don't understand and we haven't addressed the third leg of the stool in a real rigorous fashion. We have done more work on the other two legs and that's what we need to do over the next five to ten years. Not only that, we need to be monitoring what the water levels are doing much more frequently and much more accurately than we do. We really don't know what happens out there. You have been out there and have seen water standing in the mangroves, is that rainwater, saltwater, did it come in from the Gulf of Mexico,from rainfall, or is it coming off of the land? Nobody really knows. I take a refract meter with me, which is a hand held device that computes salinity and that's how I can figure it out. If I go out with Mr. Lukasz and walk around knee deep in water and it hasn't rained here for four to six weeks, I check the soil and have written some reports about it back to various people, and often times it is fresh water. That is a pretty clear indication that if it hasn't rained in four to six weeks and we have knee-deep water that is fresh, we have another source of water entering the system. I don't know exactly what it is, but we need to find that source. That is where we need to be going or moving in that direction and monitoring the levels and salinities of the water all through the system so that we can start to understand and manage it. I believe the system is restorable, those fresh water entries are manageable and that we can do things with them. We are not necessarily going to make them go away, but there is a significant amount of water that comes into the north part of this system and into Bay Colony that stays there a long time. Mr. Lewis continued, "As an analogy, if we were to take 100 rubber ducks and float them in the north bay, 100 in the middle bay and 100 in the bay to the south and wait two or three weeks and then go out to recover the ducks,where would they be"? You already know what that answer would be. Most of the ducks in the bay to the north would still be sitting there, about one- half of the ducks in the middle bay would be gone and most of the ducks from the bay to the south would be sitting out in the Gulf of Mexico. That is exactly what happens to the fresh water 147 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 12 of 27 April 4, 2002 that gets into this system. Freshwater that comes in the north end sticks around for a long period of time, it just can't get out. For that reason the reconnection of this system to the north may be the single most important thing that we can deliver, but we need to have professionals, working with biologists, study it to give us a more definitive answer. I am convinced of that and I wasn't convinced early on. Mr. Turrell is the person I can give credit to for stepping forward and saying that may be one of the cure ells for our system. It can be studied; it can be quantified and can be brought back to you. The questions Mr. Ward always asks are, how much water do we have to get out. where does it have to go out and can you guarantee that we are going to restore the mangroves? He has been asking that question for five years and every time our reply is, "I don't know". I think we need to get an answer to that question. We need to get a better handle on this hydrology. Mr. Lewis stated that the point that I have made with the conveyance plan is that when freshwater enters the system west of the berm, it doesn't get into the bay very easily. A lot of the water gets trapped in the mangroves and that is the cause of a lot of the stress. When we start looking at our stress areas, they correspond with where the fresh water enters the system. It is my opinion the water is trapped in those areas and is the reason we have been digging the internal ditches. Those channels are just band-aids, they do some real quick cures, but they are temporary. The real issue is that we have to figure out a way to get the water that is coming in, into the lower part of the bay faster and get it out Clam Pass as fast as possible. That is the whole idea behind redirecting Systems III and IV. The part that is not yet funded is to do some studies and we have to figure out not just how to get that water from System IV and III, but how you get it into the system where you are not going to kill mangroves. Conveyance means moving the water through the mangroves as fast as possible and at the right location. That may mean something more than a simple little ditch and might be something a little bigger, but it is a quantifiable thing to show where those ditches should be and if you have an outfall structure here, you don't put a ditch over there. The outfall structure should flow directly into the ditch. That is some of the work we still need to do. 148 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 13 of 27 April 4, 2002 Mr. Lewis continued that it took a long time for this system to get sick. it was sick when Mr. Roessler was here early on and it started with Vanderbilt Beach Road being constructed. The system started to go into stress and has been under stress for a long time and it is not going to recover in just a matter of a few years. We are showing some positive signs and the part that is not showing the kind of response that we would like to see, is very predictable from what we knew. Believe it or not, it is not a surprise to me. If you think about how far we have come, this freshwater issue has been kind of haunting us and we haven't really bit the bullet and we have to bite that bullet. We have to be prepared to monitor what is going on and when we spend this money we have to monitor the kinds of results we get. You said the water levels were going to improve; can you show us they have improved? At the present time we have not designed that plan into it, but it is simply part of the monitoring program that we could beef up a little to make sure we are watching those water levels, so that when you spend the money you get results. That should be a quantifiable, demonstrative thing to you and to all the citizens who have to pay the taxes for this. Those are my thoughts on where we need to go and I do endorse the funding have recommended here and hope we can go on with these at the next meeting. Mr. Werner stated that Mr. Lewis had indicated that one thing we had not agreed to was trying to measure the freshwater inputs into the system. I don't understand how that can be so difficult. Are you talking about the groundwater that is percolating in there? Mr. Lewis replied, "We are talking about the entire water balance, which includes irrigation, rainfall, storm water and groundwater and it has to be looked at in relationship to the tides". While I said to you, you know where those 100 floating ducks are going, that is not being quantified in the sense that we need it quantified. Mr. Werner stated that we certainly know how much it is raining and we can measure that, isn't that right? Mr. Lewis replied, "Again it is not just rain water and quantifying it, but precisely where does that rainwater coming off of the ground enter the system, in what quantities and which one of those culverts carry 1%, 5%or 10%of that water". 149 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 14 of 27 April 4, 2002 Mr. Werner asked how difficult it woud be to measure what was going through those culverts? I can't imagine that is a major production. Mr. Lewis stated that it still requires some study and that has not been done. If you add up all the pieces, we know what the pieces are, and one year ago there was a proposal to put all of those pieces together. The decision was made at that time not to proceed with the study. I would suggest that we revisit that issue and I would endorse looking at that. We should be doing the design work for the plan; we don't have to build it, Mr. Turrell and I both can tell you that the hard part is getting the design work done and to start running the flag up the pole with all of the agencies. If you get to the last point and you decide to modify the plan or you don't want to build it. then fine. You have such a long lead time for design and permitting that we have got to be proceeding with that and if after some study we can modify or tweak those, as need be. if we find it needs to be done. My professional recommendation is that those two options, Vanderbilt Beach connection and re-routing systems IV to III, should be pursued and pursued immediately in terms of design and permitting. Mr. Turrell stated that I am in total agreement with nearly everything Mr. Lewis has said. The one thing that is going to be difficult to quantify is the groundwater inflow. What we want to do is fix those surface water flows and like Mr. Lewis said, you could divert it to the south or push it out Vanderbilt Lagoon. I think that we need to expand on what Mr. Lukasz and Mr. Humiston have been doing as far as looking at water levels and I think we should pursue the study on the options of getting rid of that freshwater, one of which is the Vanderbilt reconnection that has always been so scary to everybody. Three years ago when my neighbors were after me to do just that, we had just finished permitting Vanderbilt Beach Road and I could have modified the permits. The Water Management District told me that I could, but it was not a popular thing because people did not understand the hydrologic impact and I understand that. The study will answer that and will provide the answers that you need, to decide whether to move ahead with that project or not. To do that project and put in culverts, or I always thought you could do something nice by using big elliptical culverts to make it appear like a bridge would be a real asset to the community, but that is not cheap. You want to be real sure of what you are doing 150 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 15 of 27 April 4, 2002 before you go down that road and that is what the study proposed by Mr. Humiston and others would do. Mr. Werner stated that part of the conflict in my mind is similar to the Seagate culverts. We built the road, put in the culverts and it is the same thing here. This will benefit Vanderbilt Bay and it seems to me that the ones being considered to pay for it is Pelican Bay. It is time the County got involved in this also. Mr. Turrell stated that I don't disagree with that. The last time I went down this road I had some developers in the north end who were interested in participating, but it wasn't going anywhere so I went to Guatemala and hid. Mr. Domenie stated that Mr. Lewis was talking that about one inch of water would kill mangroves. Are you referring to Black Mangroves? Mr. Lewis replied, "I was referring to all species". The Red Mangroves do tolerate some submergence. Mr. Domenie stated that in Key West you see mangroves standing in saltwater. Mr. Lewis replied. "I know that is a perception, but take it from an expert who has been working for 36 years on mangroves, what you think is mangroves standing in water all the time, actually turns out that those periods of time are not nearly as long as you might think they are". Red Mangroves can take some standing water, but not 365 days a year and despite what anybody thinks, the American Mangroves cannot do that. There are actually Pacific Mangroves that can, but American Mangroves cannot deal with standing water for long periods of time, they will eventually die. Believe it or not mangroves are like humans and they need to breathe. If you don't give them the chance to breathe, they are going to die. Mr.Ward stated that the only other issue is the Seagate Flap Gate issue, which is minor in relation to the Clam Bay Restoration. The consultants have talked about the re-direct of water from System III to IV and we have decided to hold off on that issue. I think now that the consultants are all here together, they ought to at least tell you what they believe needs to be done. 151 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 16 of 27 April 4, 2002 Mr. Johnson explained that we, WilsonMilter, did proceed with a study to see what we could do about diverting freshwater out of the system and obviously that is one of the things that everybody is in consensus with and that is that the abundance of freshwater is part of the problem. In looking at that we looked at how we could take the surface water, excluding groundwater for the minute, out of here and alleviate a potential large burden of the freshwater infiowing into the system. That is when we came up with the two real options. which could be implemented. The biggest option, as far as dealing with impacts into the upper portion of Clam Bay, was to divert water into Vanderbilt Bay to the north. From a technical standpoint, as far as modifying the Stormwater Management Permit that is in place, the culvert to get it across the road and all of the elements that go into making it a feature that could be permitted from the storm water management aspect of the South Florida Water Management District, we feel we can comfortably get that accomplished, subject to any environmental issues that may come along and they always do. Presume for the minute that those environmental issues can be resolved, the technical merits of being able to make that connection and actually divert the bulk of Drainage Basin V off into the north is huge in terms of the surface water management inflow of freshwater coming into the system. Part two of that is trying to get the water diverted from the upper portion of Clam Bay down into the inner portion of Clam Bay,where I am hearing that the upper portion is more stressed. We had to look at what we could do in terms of how we would not impact the existing storm water management system that is in place, keeping everything else the same and how much water can we divert from System IV to System III. We came up with a four-inch rainfall, which is a two-year storm. That takes care of most of the annual rainfall that falls within System IV and diverts it down to System III, thereby relieving a huge portion of the surface water inflow that is going into the upper portion of Clam Bay. That to me is a very significant item as well. One of the things we did include as part of that report was a roughed-out water balance. What you are hearing are a couple of conflicting studies that make the water balance study a little hazy. You have one groundwater study that says there is this much water coming in and another one that says that there is this much coming in and both are significantly different. The budget we use depends upon which groundwater model you are using, to throw it into the model to see 152 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 17 of 27 April 4, 2002 how much of an impact you are going to have percentage-wise for what is inflowing into the system. That still remains as somewhat of an unknown, which is why everybody is talking about looking at additional studies to make sure that we can define that much better, so that you can have a better handle on the predicted results. Otherwise, your water budget model is not going to be very good if you have a factor of ten between one study and the other. Obviously the diversion of fresh water from the rain events themselves is the easy part. What percentage that represents of the total inflow into the system is the difficult part. The general consensus is that the diversion of this fresh water elsewhere is generally a good thing to do and I don't think you are going to find anybody here disagreeing with that. The comment about possibly quantifying the flow coming through each of the individual culverts, I have models that we ran while we were doing the regional study so I could provide those numbers. We could use that as part of the hydraulic improvements as part of the channels within the estuary system itself. It appears to me that pursuing diversion of the storm water and fresh water out of the system would only be of a benefit at this point. Mr. Domenie stated that I am not an engineer, a draftsman or artist but he showed a cross section he drew of the berm. Everybody agreed that we had to kill the cattails and that by digging a deep ditch we were going to take the fresh water out of that area and push the saltwater in. The way I view it, the situation there was different. You still have the cattails, but there was the elevation rise with constantly falling leaves so that water really was not flowing to upper Clam Bay and you did have water that percolated underground feeding the mangroves. When the ditch was dug we saw that the water levels fell about 14"-16" in that area. What has happened now is that the water level has dropped and there is no water and are these mangroves getting sufficient water? If we dropped the water level 16", then the water level in the mangroves dropped 16", and will that have an affect of killing the existing mangroves in that area? Related to that question, if that water level has dropped 16" and we are going to divert the water from System IV to System III, will that be a further influence? Did we use a wrong model when we started talking, because we were talking about a water level that was 16"higher than we see today'? 153 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 18 of 27 April 4, 2002 Mr. Turrell stated that having been a former unsuccessful nursery owner, I am familiar with plants and they do adjust to changes. As we threw more water into this system gradually over the past thirty to forty years, those plants may have acclimated to a little higher amount of water. When we take away that artificial inundation, maybe they are getting stress related to that, but I think we have all agreed that there is too much fresh water. The question becomes, how fast can we snatch that water away from them without risk of shock? Mr. Lewis replied, "First of all, keep in mind, pending what your surveys have shown, we may need to do just a little more work to definitively answer this". You should understand that the cattails probably have built up a level of organic material and it may not be a pool type situation, but maybe a situation where the organic material is even with the mangroves and that organic material is going to oxidize over time and it is going to collapse and sink. The idea was that as that happens and we give it time to do that, you may not see saltwater in there today, but you would in the future and keep in mind that the tides change every day and every month. Right now, this time of year is the lowest tides. The lowest tides are typically the first week of January and they are still low in February and March. The highest tides are in August and September. We are going to have to wait through the summer to see what happens. In answer to the question about the mangroves, there are places where I can show you mangroves growing on dry land. Mangroves do not require water to live, in the sense of saltwater. They need water just like magnolias or anything else, but if you take a Red Mangrove and plant it in your front yard, it will grow just fine. More water is typically a problem and less water is less of problem and they can survive amazingly well in fairly dry conditions once they are established. I am not worried about the decline in water level, and the mangroves may actually be much healthier. Mr. Domenie stated that is one of the reasons we dug the channels and got rid of the cattails. Saltwater was going to flow into that area and the cattails were going to die naturally, so we sprayed the cattails and killed them to get rid of them. I asked if we were going to measure the salinity of that water. I have walked there three hours after the high tide and I see no evidence of a reverse flow. I don't see any saltwater entering that area whatsoever, which was the whole point of digging the channels. 154 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 19 of 27 April 4, 2002 Mr. Lewis stated this is pretty quick to ask a system to respond. That organic material is still largely in place and until it dries, oxidizes and compacts, as it gets lower there is much more opportunity for saltwater to come in. The saltwater tides we are counting on are not this time of year. We need the higher of the high tides. Mr. Domenie stated that during the dry season,which is now, is when we need the water. Mr. Lewis replied, "That is not so". Mr. Turrell stated that it takes 7 ppm to kill cattails. Mr. Domenie stated that no one has measured it yet. Mr. Turrell replied, "Yes, we have been measuring it". There has not been any saltwater in there yet. I don't think anyone said that absolutely, for sure, we were going to get saltwater back up there. We had hoped. There is something very important that you are missing here and that is that cattails are not viewed from a positive environmental standpoint. The Water Management District is spending millions of dollars trying to get rid of cattails in the Everglades and there isn't any saltwater there either. Some of these other plants that we are planting in here are environmentally better because they allow light to penetrate and the bottom line is that those cattails were not biologically productive and what we are going to plant in there is, whether or not saltwater gets in or not. We hope saltwater gets in there primarily because it will exclude the re- growth of cattails and that way we do not have to manage it. Besides that, the plants are going to be more productive than the cattails, regardless of whether or not saltwater gets into that area. Mr. Domenie stated that nobody had planned for that water level to drop 16" in all of our discussions. I am asking. are we on the wrong path? Mr. Turrell stated that I think you just heard Mr. Lewis say no. Mr. Lewis stated that we did actually plan for 16" of water flow. I have been talking with Mr. Lukasz about this plan for several years and I always told him that I wanted to pull the plug on the bathtub. I said I know if I find the right spot and dig the channel, I am going to pull the plug and this whole thing is going to drain over night. We did it and that has always been the plan and it worked exactly as it had been planned. 155 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 20 of 27 April 4, 2002 Mr. Domenie stated that we dug the channels and when it rains you get high water and after Tropical Storm Gabriel we saw that the channels worked beautifully at the north end and within forty-eight hours all of the water had drained and you had water in the channels. Now we have a bunch of cuts and if you walk along the boardwalks you can see some of them. It goes to something you said whereas these cuts have to be maintained to be effective. What I see at the moment is that we have many dry cuts and as far as I know when you start getting a cut like that you are draining water away from the land. As long as no saltwater is coming in, we are actually drying out the land. Mr. Lewis replied, "That is exactly what we intended to do". Mr. Domenie asked, "To that extent"? I was always told that we wanted to put those channels in to bring saltwater into the system and drain the fresh water out, but I see no evidence of saltwater coming in to any of these channels. Mr. Lewis stated that when you dig the channels, in the back they are going to dry intentionally. If you walk the channel that is dry on the backside all the way down to the bay, where that channel goes into the bay, in most cases you will find that it is wet. There is a gradient in the canal, which allows the water to drain and that was the intent all along. We are actually trying to take the mangrove soils, which are a sponge and hold water, and dry them. The lateral movement of that water into a dry canal is part of the plan, but the maintenance is important. Mr. Turrell asked if you have ever run across dry soils that were oxidizing the mangroves? I haven't, they have always been wet and spongy which indicates there is plenty of water in those soils. I understand where you are coming from, but that is why we hired Mr. Lewis. Mr. Pete Mendelson — Bay Colony— I was looking on the map and the open water north of Vanderbilt was not naturally there. That was dug in 1952. Don't they have their own drainage problems in Vanderbilt and isn't that bay polluted? Mr. Turrell stated that there was open water up there and I have aerials that show the extent of it. If you come to my office I can show you those photographs. There was open water, Vanderbilt Lagoon was channelized, mangroves were filled and they eliminated any habitat that 156 Agenda Item#69 CLAM BAY SUB-COMMITTEE Page 21 of 27 April 4, 2002 was around it. However, the water quality in Vanderbilt Lagoon is certainly better than what you would find on the Bay Colony side, immediately adjacent to the road, but once you get back into Vizcaya the water quality is fine. We had Ms.Worley from the Conservancy actually measure the water quality. The small lagoon's water quality is awful and it is full of silt. The water quality on the Vanderbilt Beach side is much superior to this. Something you have to understand is that if they ever do this reconnection, the water from Vanderbilt Lagoon is going to flow into Pelican Bay and around the Ritz Carlton and is not going to flow into Bay Colony. Mr. Mendelson asked if the water was fresh? Mr. Turrell replied, "It is absolutely fresh water". Mr. Mendelson asked what happens to the vegetation when the water goes in there? Mr. Turrell stated that the mangroves are happy because they are mangroves and are used to having salt or otherwise there would not be mangroves there. Mr. Mendelson asked, "How about everything else"? Mr. Turrell stated that there are some elevations over the weir and the willows and nasty thicket used to be a bay. Now, because the fresh water has driven it, it is not a very nice place. Now if saltwater got into that area the willows would die and it would be an awful mess. The tide would have to get over a certain level to get saltwater in there and is something that we would look at in the study. If we were worried about that we could raise that weir a little. That system is green as far as you are concerned and in some ways it is okay. Historically, old timers will tell you that they could take a skiff all the way through the system so obviously once upon a time there was a connection. I believe they actually left a culvert there in the early days and at some later point that culvert was cut off, possibly even when Pelican Bay was planned in the 1970's that was cut off, but back in the 1950's they left a culvert there. Mr. Domenie asked if there was a plan to connect Vanderbilt Beach to upper Clam Bay by going under Pelican Bay Boulevard? Mr. Turrell replied, "No". Some people at the Conservancy had suggested that might be worth looking at, but that is huge. That is a very expensive thing to do and you are not really accomplishing anything fresh water-wise by doing that. By connecting it with culverts under 157 Agenda Item#6g CLAM BAY SUBCOMMITTEE Page 22 of 27 April 4, 2002 Vanderbilt Beach Road, you divert all of that fresh water. Now you would have to spend $1,000,000 to connect the bay. We can direct Humiston & Moore to look at the flushing, but I don't think we are going to dig a big channel through the mangroves. Mr. Chuck Walton — Claridge-- I thought the original idea of clearing the cattails was that they would be cut down and the saltwater would come in and that they would not re-grow. Since we now know that saltwater is not going to come in there for quite a long time, it is clear that is not part of the replanting program so it is going to have to be total killing by chemical means because there are tons of cattails re-growing out there right now. Clearly it is going to have to be done by spraying before you can do the replanting. Mr. Lukasz stated that we plan to continue spraying them with herbicides about every six weeks until they are under control and we start to get salt water in there which will stop the re- growth_ Mr. Turrell stated that saltwater intrusion was never an absolute and short of that happening, once the vegetation that you plant in there becomes established it starts preempting the re-growth of cattails. That is why we are trying to kill the cattails before we spend money on re-planting because it is expensive to keep the cattails maintained. The bottom line is, and I know people don't like how that looks right now, but Pelican Bay is trying to spend money to do a positive environmental thing and I would suggest to the community that they be patient. Mr. Domenie asked if you are aware that the Trieste is building an access road in Bay Colony and how will that affect the water flow unless you put culverts under that road? Mr. Turrell stated that there is already a culvert located under that road. Johnson Engineering engineered that access road and my guess is that they did not change the control elevation because that would have required re-permitting. If they would have to move the weir they would move it at the same elevation. Mr. Roellig stated that we need to start looking at what alternatives we have in the future and one of the first things we want to do is to consult the proposals to see what kind of costs we are talking about and get some order of magnitude of any kind of construction costs to decide what options we should pursue for the future. At the moment we are in a state where we are not 158 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 23 of 27 April 4, 2002 sure of what kind of costs or time we are talking about. I don't want to get into the source of the money at this moment because I think we need to define the problem and define the studies, which are required and to get some kind of construction cost estimates to give us something to consider before the full Advisory Committee. Mr. Turrell stated that I believe WilsonMiller has part of that answer because we have a budget for the water diversion. We know the cost of the study because Humiston & Moore had proposed it and we could have them regenerate that. We need to come up with a number for the hydrographic information that Mr. Lewis is pointing towards, and Mr. Lukasz can come up with that because you have the tide gages, and we will look at that. As far as the physical costs if you decide to go down the reconnection road, I have those from my last nightmare a couple of years ago. We will put all of that together and then come back to you with a scope of all of these things. If you go with them all, which I think you probably should and I hate to be the one to tell you to spend more money on this project. As the guy that has been hanging around for three years trying to figure it out and hiring the best people in the world to help me and there are still questions, the only way to get the answers is to collect the data. If we do go down that road, I am going to need to dedicate part of some staff time in my office to this project. It is a pretty big undertaking and is not just the studies; it is somebody to manage those studies. You have the option of hiring somebody where that would be their job. Mr. Werner asked for Mr.Turrell to explain how these connect to each other. Mr. Turrell replied, "We will do that and I will include a proposal from my office to dedicate some staff time to take care of it". You can deal with that however you choose. Mr. Ward stated that he fully agrees with Mr. Turrell. We need to get to the point of getting this scoped out in terms of where all of the consultants need to go. over whatever period of time and the estimated construction costs from sometime to five or ten years out and dedicate the necessary consulting resources in order to manage this project in an effective and efficient manner. I don't know what kind of time schedule, but I believe most of them have this information available from previous work they have done over the past year or two. Without putting them on the spot at this time, I would like to possibly have another Sub-committee meeting in 159 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 24 of 27 April 4, 2002 approximately two weeks and have these gentlemen go over their proposals with you. We will put together what that means in terms of estimated costs to residents, moving forward. Mr. Werner asked if we could have a chance to review what they put together before the meeting? Mr.Ward asked if the information could be ready in one week? Mr. Turrell replied,"Yes". Mr. Turrell stated that I believe it would be a good idea to have quarterly meetings. I actually learned a lot today. I am trying to deal with all of this; it is complicated and it helps me for everybody to get together. Mr. Roellig stated that is something that we should probably look into and would be beneficial to all. It is very worthwhile to get everybody on the same page and I trust that the residents realize that there is a great range of expertise, education and experience required to manage this problem. I think that while it is somewhat expensive, I don't think there are any real shortcuts. Mr. Roellig stated that we discussed the Seagate Flap Gates at our meeting yesterday and apparently there is going to be a meeting with the residents on Venetian Bay. I believe they have an idea of our plan to do some monitoring there to see what the real effects of the flap gates are now that they have been in for quite a while and see how much flow there is under existing conditions and to see what the flow will be when the flap gates are removed. My personal view is that the flap gates probably need to be taken off for cleaning and we will pursue that. Mr. Roellig continued that we have people from the University of Florida talking about the Florida Yards and Neighborhood Program. This is a program that is to have the vegetation, irrigation and fertilization looked at in order to bring it into compliance with as natural a system as possible. Collier County is initiating this program and they have a new person coming on line whose job will be dedicated to this program. As an associated activity, this will be something available to the Pelican Bay community because part of the problem is that there is a wide diversity in the ways in which the various properties are managed. When you talk about the management of individual condominiums, it is pretty much left up to the condominiums as far as 160 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 25 of 27 April 4, 2002 the kind of irrigation and fertilization that they are doing. I think we need an educational system put in place so that the condominium associations can get a better appreciation of what they can do that would be healthy for the mangroves. It is not something that the MSTBU can require be implemented, but as good stewards I believe a lot of the condominiums will participate_ Mr. Roellig continued, "At the meeting yesterday it was reported that the Dune Restoration Program is underway and applications will be submitted for regulatory approval within the next few weeks". When we have our next Sub-committee meeting, Mr. Turret! can provide an update on that project. Mr. Burke stated that I am a relative newcomer to all of this and this was a very informative session for me. I appreciate all of the comments and feel much more informed than I did before this meeting started. JIM GAGE LETTER Mr. Jim Gage—Coronado resident— I also learned a lot this morning from this meeting. I sat in this room and listened to Mr. Turrell talk about the Vanderbilt connection four or five years ago. What I would like to suggest to this Sub-committee today and I feel that it has to come from this group, is that the community and all of the condominiums should be given a letter with suggestions only, calling to their attention the various things that we know pollute the mangroves. When we lived in Pebble Creek five or six years ago, you could walk the berm and on the east side the water was clear, you could see fish nesting, it was alive with wildlife and today you see very little. Once in a while you might see a wading bird. I know from my experience, from my own condominium, even though we work at it, it is a terrible thing. I can't begin to tell you how bad the condominiums pollute our mangroves. I recommend that this Sub-committee and the MSTBU put together a letter of recommendation outlining the various things that we all know pollute the mangroves, the use of bio-degradable cleaners, the spilling of swimming pool treatment systems and get that out to the organizations as an effort to make individuals aware of what they can do as a condominium or individual to help. 161 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 26 of 27 April 4, 2002 Mr. Turrell stated that I think that is an excellent idea and we will help draft that for your next meeting. We will work with Mr. Lukasz to get something drafted that you can review and discuss. Mr. Werner stated that you say pollute the mangroves and part of the reason for that swale is to capture the bad stuff before it goes into the mangroves, maybe that is why it looks so bad. Mr. Turrell stated that Mr. Gage has a good point. The whole idea of this is that each Association has different lawn care companies, different cleaning companies and there is no standardization. One service buys fertilizer at K-Mart and just throws it on and I think getting some kind of control is what Mr. Gage is talking about. I think that is an excellent idea and we are going to try to help with that. Mr. Werner stated that I agree with you, but we continue to monitor the water quality in Clam Bay and it appears pretty good. Mr. Domenie asked if the MSTBU should be involved in that rather than the Foundation? The Foundation can get it into the Pelican Bay Post and we also have the President's Council who should be involved. The Council is made up of Presidents of all of the Associations and those are the people you have to get to. Mr. Gage stated that I agree and what we are talking about is tying to improve communications. I must tell you that the President's Council is completely ineffective. Probably less than 35% of the condominiums belong to the President's Council. Possibly the Foundation or the Post, but I think somebody has to take the initiative. If we say we are going to move it to the Foundation we are still going to be here a couple of months from now. Mr. Werner stated that if Mr. Turrell is going to put the information together we should move ahead and use it. Mr. Turrell stated that I will put together some information. It is common sense things, like the Yards and Neighborhood Program for yards. There are common sense things for cleaning products, etc. 162 Agenda Item#6g CLAM BAY SUB-COMMITTEE Page 27 of 27 April 4, 2002 Mr. Domenie stated that what worries me is that we sent out 5,000 notices for the Yards and Neighborhood Program and how many people showed up? Maybe 50. Mr. Turrell stated that is the way of the world. Everybody pays lip service to environmental issues, but when it comes time to actually learn about it, they are too busy. Mr. Roellig stated that the meeting yesterday was the first step in the Florida Yards and Neighborhood Program and hopefully we can increase the participation in the future and get people more in line. It starts off one step at a time and that was the first step. Even now we are not ready to start because the new person is not on board until May 1 and it will be a considerable time before they get up to speed in Collier County. Since we do have the responsibility for the mangroves, it would be more for our area than the Foundation's. Mr. Werner replied, "Since we have taken the responsibility for the mangroves". If this is directed to the condominiums, there are only forty or fifty to provide the information to and Mr. Carroll could put it in the Pelican Bay Post. Mrs. Potter stated that you are right; we are late in doing something about the Florida Yards and Neighborhoods Program. Collier's Reserve already has this program in place and they even have won Sustainable Landscape Awards for it. We could get a lot of information from them as to how they have their program in place. There are eight and nine year old programs in place throughout the State of Florida, where we could get a lot of information. It would be wonderful if Mr. Turrell could provide information on biodegradable products. As Dr. Kelley said yesterday, the Yards and Neighborhood Program cannot endorse products, but it can endorse treatments. You are about the most informational group in Pelican Bay and by this time next year we could have a very good program in place. ADJOURN There being no further business the meeting adjourned at 11:25 A.M. Mr. David Roellig, Chairman 163 Agenda Item#7a Page 1 of 3 QUOTE 15-6397-01 CLAM BAY ENVIRONMENTAL SERVICES Purpose and obiectives The overarching goal of the Clam Bay NRPA Management Plan is to establish the basis for management activities that will be undertaken to protect the health of the Clam Bay Natural Resource Protection Area . (NRPA)estuary. Specific information regarding the Clam Bay NRPA Management Plan,Clam Bay permits,annual reports,maps,etc. is posted at: http)//pelicanbayservicesdivision.netirfqclambayactivities.html The purpose of this request for service is: I. Maintain and protect the native floral and faunal communities 2. Ensure estuary has adequate tidal and freshwater flows to maintain ecological health 3. Maintain water quality 4. Monitor archaeological sites S. Ensure recreational activities are environmentally compatible Scope of Services: BASE BID---Provide pricing for tasks l — 10 in the compensation schedule below and sum the totals in line 11. The quote will be awarded to the responsive quotes with the lowest line I I total. Task I-Mangrove monitoring (Lump Sum) • Annual monitoring of nineteen(19)existing plot locations(see Exhibit 2). • Quarterly photographs from rooftops of two high-rises(Grovesnor&Montenero). Contractor is expected to make arrangements for access with project manager. • Observations,data,and recommendations from this task should be included in the annual report (Task XI). Task II-Exotic and nuisance vegetation monitoring (Lump Sum) • Quarterly inspection of NRPA including berms, boardwalks, and waterway areas to identify Category I and II invasive exotic and nuisance vegetation. • For the purposes of obtaining exotic and nuisance vegetation removal quotes,contractor is expected to advise project manager of these locations and recommend methods for removal on as- needed basis. • Observations, data, and recommendations from this section should be included in the annual report (Task XI). Task III-Coastal Scrub and Cabbage Palm Hammock monitoring (Lump Sum) • This is a new annual monitoring activity. Coastal Scrub and Cabbage Palm Hammock plant communities were identified within the Clam Bay NRPA(see Clam Bay NRPA Management Plan pp. 12-15). • Establish and monitor at least three(3)new plots, 11-Feb-16 Awai t:El ttem#167a • Observations,data, and recommendations from this section should be included in the annual2iep3ort . (Task XI). Task IV-Seagrass monitoring (Lump Suns) * Annual monitoring of eight(8)existing transects(see Exhibit 5). • Observations,data,and recommendations from this section should be included in the annual report (Task XI). Task V-Protected species monitoring (Lump Sum) • Annual identification of floral and faunal species and associated habitats., • Annual identification of gopher tortoise burrows, * Obtain Collier County sea turtle nesting data from appropriate County division, * Observations,data,and recommendations from this section should be included in the annual report (Tusk XI). Task VI-Recreational facilities monitoring (Lump Sum) • Bi-annual or on an as-needed basis following up to five(5)storm events,inspect canoe trail markers signage and for the purposes of obtaining quotes for repairs, inform project manager of any damaged elements. Task VII- Archaeological sites monitoring (Lump Sum) * Annually inspect three(3)archaeological sites for signs of disturbance(see Clam Bay NRPA Management Plan p.36). • Observations,data,and recommendations should be included in the annual report Task VIII-Hand-dug channels inspection&maintenance (Lump Sum) • Annual inspection and clearing of existing hand-dug channels(see Exhibit 4). Work should be clone in March or before the rainy season starts,and on an as-needed basis following up to five(5) storm events or strong tidal surges. * Coordination of maintenance clearing,debris removal,and removal of vegetation or trees obstructing waterway and/or canoe trail to ensure appropriate freshwater inputs and drainage. • Observations,data, and recommendations from this section should be included in the annual report (Task XI). Task IX-Water level monitoring (Lump Sum) * Three water level loggers are currently installed at three existing well point locations(see Exhibit 3),these are owned by current service provider. • Installation and maintenance of three water level loggers. • Water level logger data should be monitored quarterly. • Inform project manager of any problems or concerns with equipment on an as-needed basis. * Observations, data,and recommendations from this section should be included in the annual report (Task XI). 11-Feb-16 ApautthItffi1T 7a Task X-Annual Clam Bay monitoring report and presentation (Lump Stun) P".::+8 ardir 3 a Prepare and present to the PBSD Board an annual Clam Bay monitoring report detailing the state of the system for the monitoring period. ALTERNATE BID--Provide a time and material amount in line 12 for the various services described below. The price entered in line 12 is not included in the award formula. Task XI-General and Miscellaneous Services Time and Material e General consulting services on as-needed/as requested basis. • Attendance at monthly PBSD Board and Committees meetings, and/or Board of County Commissioners' meetings on as needed/as requested basis. e Assist project manager with preparing educational material such as the Clam Bay Field Guide and Clam Bay Canoe Trail Map&Guide on as needed/as requested basis. • Emergency retrieval of tidal gauges data on as needed basis. ® Contractor is expected to advise project manager of stressed areas and make recommendations to - mitigate/resolve problems on as-needed basis. • Shorebird monitoring prior to or following any dredging event as required and outlined in Terms and Conditions IIl of the U.S.Fish and Wildlife Service Biological Opinion No.41420-2010- CPA-0395. • Seagrasses monitoring prior to or following any dredging event. s Inspect canoe trail markers signage and for the purposes of obtaining quotes for repairs,inform project manager of any damaged elements in excess of the five(5)included storm events. • Annual inspection and clearing of existing hand-dug channels(see Exhibit 4)in excess of the five (5)included storm events. Coinuensation: Task Description Unit of Measure Price 1 Mangrove Monitoring Lump Sum _ J $ 2 - Exotic and Nuisance Vegetation Lump Sum Monitoring _ 3 Coastal Scrub and Cabbage Palm Lump Sum $ Hammock Monitoring 4 Seagrass Monitoring Lump Sum _ $ 5 Protected Species Monitoring Lump Sum _ 6 Recreational Facilities Monitoring Lump Sum $ 7 Archaeological Sites Monitoring Lump Sum $ 8 Hand-dug Channels Inspection and Lump Sum $ Maintenance 9 Water Level Monitoring Lump Sum $ 10 Annual Clam bay Monitoring Report and Lump Sunt $ Presentation 11 Total $ ALTERNATE BID 1 Task I Description Unit of Measure Price 11-Feb-16 Agenda Item#7d P 10 ' Pa e1 of TURRELL, HALL a ASSOCIATES, MARINE& ENVIRONMENTAL CONSULTING 3584 Exchange Avenue.Suite 11 e Naples.Florida 34104-3732 U(239)643-0166 P Fax 643-6632®marielle@turrell-associates.com March 8,2016 Ms. Lisa Jacob Pelican Bay Services Division 801 Laurel Oak Drive, Suite 605 Naples,FL 34108 Re: Request for Quote: Clam Bay Water Quality Monitoring&Analysis Dear Ms.Jacob: Turrell, Hall &Associates and our sub-consultant ESA, are pleased to provide you with this proposal for Water Quality Monitoring and Analysis of the monthly monitored sites. As we had discussed the Watershed Information Network(WIN) program will not be available until at least December 2016; the end of this contract period,so we have provided a price to update the Storet program with new stations and then organize and enter held 2015 and new 2016 data into Storet. \Ate have also provided the costs without the data upload since it was the original Board direction to hold the data until WIN was available. We have also provided one person per board and committee meeting for the year to be able to attend and answer water quality questions should they arise or to present if it is a quarterly presentation month. Based on the scope of services you provided our pricing is as follows: Task I—Clam Bay Water Quality Monitoring Monitorintz& Analysis (Without Storet Batty $22,440.00) (Including Storet Entry$29,440.00) O Preparation of film quarterly (4)and one(I)annual technical memorandum(TM) to summarize Clam Bay water quality(WQ) laboratory data and evaluate compliance with referenced water quality site specific alternative nutrient criteria(SSAC)adopted by the U.S. Environmental Protection Agency(EPA)and Florida Department of Environmental Protection (FDEP)as indicated in the Florida Administrative Code(FAC)62-302.631. © Entry of monthly WQ data into historical PBSD"Master"WQ spreadsheet and provide file to project manager on annual basis. o Entry of monthly WQ data into State of Florida data repository used to store water quality data (STORET/Watershed Information Network aka WIN,the successor to Sb RET). o Attendance at five(5) PBSD Board or Committee meetings to present quarterly and annual technical memorandums(TM). ^y'"tia"w"'fifd nda Item#7d Page 2 oT2 Page 2 of 2 Page 2 of 2 General and Miscellaneous Services ($12,375.00) • • General consulting services on as-needed/as requested basis. • Preparation of exhibits or other presentation materials in excess of the four(4)quarterly and one (I)annual TM. • Attendance at monthly PBSD Board and Committees meetings,in excess of the five(5)included meetings intended to present the four(4)quarterly and one(1)annual TM. } Please feel free to contact me with any questions. Sincerely, Tim Hall,Vice President 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 do Neil Dorrill FROM: Tim Hall DATE: December 16,2016 RE: Status report on flushing channels in Upper Clam Bay At the request of the Committee,we have undertaken a review of the flushing channels within the die-off area in an attempt to answer several questions that were posed to us at the November Committee meeting. Specifically; - Why is standing water still present along the Strand wall following a month of no rain? - Which channels are still effective and are there any that are no longer working as designed? - Will digging more channels address standing water still being observed along the Strand wall or elsewhere in die-off area? As we started on this investigation I first wanted to see if the area as a whole was responding in sync with the tidal information the Board has been gathering via the new tide stations. I looked at the past 6 months of tide data from Upper Clam Bay and compared that to the water level logger that EarthTech had installed in the mangroves of Upper Clam Bay. Exhibit 1 attached to this memo is the tidal data for Upper Clam Bay. Exhibit 2 is the water level data from the EarthTech logger place din the mangroves. I noticed spikes in the tidal data on September 1,October 18, and November 15. These spikes corresponded almost exactly with spikes in the water logger data from inside the mangrove system. The September 1 data intrigued me because of how much higher the water levels were at that time compared to the rest of the time period. I didn't think that was the result of tidal flow only. A little more research into the ambient weather that day showed me that On September 1 and 2 we had winds over 20 mph and gusting up to almost 40 mph from the south(See Exhibit 3 weather data from 9/1),which was pushing all that extra water up into Upper Clam Bay. The good news is that the system recovered back to normal water levels almost immediately after the winds dropped in intensity and shifted to a different direction. Based on this data,I believe that the connectivity of the mangrove system to the Bay through the flushing channels is still good and water flow is happening as it was designed. Question 1: Why is standing water still present along the Strand wall following a month of no rain? We also went into the field and investigated the individual channels that allow the flow from the wall to move east through the mangroves out to the Bay. It is clear from these investigations that water is flowing from the wall but that there are pockets of lower areas where water is pooling. I believe that this is a result of lower ground elevations and not blockages in the channels. The below photographs show a couple of different areas along the wall where this elevation difference can be seen. ' ..l '< >1 •4' ., #� lip 11 M y a t 's^ !E ,\, - 14. 1 ♦ x r `.d 3 it AP" Y . ,�' § a Y`, y.. Y ,,r. LLL , I ..'" N ,,. k Ai • ._ ' . t .- f *kg 4' .h. t $ te el The above photograph shows standing water along the wall but not in the mangroves adjacent. Also shown is the flushing cut which does appear to be working as intended and helps to drain the water away. Areas along the wall are simply at lower elevations where the water cannot drain completely away except at very low tide levels. . "10W-443, c 41( „‘„, ,1: ., . `` lit; '`s; ver- iir ---is It. — • 1 .r' e. Y w a�E "_" itt‘l$:./0: , ,,,')1,,..,. t IT 1. ..,,,,,.t_ .„,, lit,'••• a- r " A, i : r. 4, to lil ._ � i , l y > „ t 4' I •. N. A . II ' _ $_ . s .tii ws. `1,. .. 4. 1 fes, tL s Ai t. This photograph shows a small pocket of water along the wall but also shows quite a few small mangrove seedlings sprouting throughout the area. These seedlings would not survive if the area was constantly inundated. Question 2: Which channels are still effective and are there any that are no longer working as designed? All of the channels that we have investigated to date were still working. Some exhibited slower flow that others but all were passing water. We have begun calculating small issues that may become larger blockages over time and will be working on triaging these so that maintenance efforts in the coming year can be best spent on areas of greatest concern. The photos that follow depict some of the minor issues that we see arising and that will need maintenance over time. There have been no catastrophic blockages or failures in the channels that would preclude them from working as designed documented as of this time. r v :. r } EE -r 3 .• ' w d � *22' yp tcy,,,+.0. r. . , . ,, , ,+,4, ,::: 7., ,,,,, ti 2 1, 5 if!. '' - ' ', .e!? a e4 L. '+ -4 t • •�.. .�`� .,� R .. 1 i ell y� ` * b f rs€ it s J �- . tit q :.. AA 1 .° 4a. '- 2 k f yi T P IlY FS t.,:S.i.:‘..-- "...k �e + tet` pf \ ,;r� � - n. „,airs &+ r I / ` rc,.,,, ,f _i-' ii ^'' h' - / This photo shows one of the channel mouths up against the wall with a partial blockage caused by a leaning tree. This was not blocking flow at this time but could do so if the tree falls completely over. :•,,,,• ,,,,,''",,1.7:?.'*-.1 •,...,-,::: •-• -: ; -•'..).,. .• .,,,: --' i- A ' - ..�. � .•fix •! !+ • j 1It 'm . ' '''.4 ' —. A -- _.: : ,. , • _ .. t 44 f t",:g. i--"r,........„.' "- ''." 2 ; . .... a I ; . ' #' ••• ---'•-• il 3 Black mangrove propagules growing into the smaller channels have the potential to cause blockages if their growth becomes too dense. t yv. j :I ,� #� M," . ' '.,,i` ( / 3 F.y• ' ,•' t # f 'f'-'74°‘11-.' I M ` I 4 ..4, ii.,-, '- ' ,.,,, if .,.,.. ," rst.ii't ': 9-. - :' . .,; - 't -',..i.„, -„',.:-..', , -', ,f,oilit,14--.;,-, 4,-..',. -. . ' -1``,h':-',i,-.....:- ''',..'•-,. ',,-% ; : 44''4,"gl... 1:ti'• . I 44 '!�w ai- 1*4‘ . Ak C ..,ld •'f -I al a' .� 1 ; ) t tar A O.'. f t ' �;y *tom • 41 Li c _.-4.,--;',"''' . ; ' itlk .. • ' ,j, ,,-r-t- ....-.,:r1,) ...,.. _.--.7 .,"...., 1. ig, .,,,,,,..,-..,,,,,., g-'4. 4 \.; * _ jk. i ,..• ,;7,,F.' . • ,.t, NAL-4'-!j ',..-•., i ,•• 4: I 1 Li ti I jij i: 140, 1 ' \Ii. � t • 1� ,.. '°"-* ate :it Irts' I — ..k. .,.i $ . \ ,i,:i,...,"*04* �' ; isk. s if lw: \ I % In,. t. I,,', It "4,e .,1; . j kw . ::-.'7,....' 4 ,a;.,_ 'o ,d` 4 z � # ec s p 1 m z t-C. @t r 9 k's S. ° More black mangrove propagules encroaching into channel but still good flow of water through it. atat, 1 \ , - . , ,s:' : '4r.k: ' voiev'l'a r:#' Tt .,... N, ":1k. *"4"."' z.744,!..dr k ‘,-11. cr l 1 it rt ' } 4 %%.'-, c , ' 4,..-z i , ' el , Jig 19 4. . Ai J i i i III •••& .. t i e id: f' • kiky,.. d,.1 1.t.4 Igi � t ! ,� � f,, Mouth of channel at interior pond entrance. The channel is still open but more vegetation growth could eventually cause a blockage. .41c1. P C? f F �.: .. .. M sem k - a - ^,' `,z - This is a channel opening into the Bay that is still very open and not in danger of blockage from growth. Question 3:Will digging more channels address standing water still being observed along the Strand wall or elsewhere in die-off area? Based on the flows observed and the general conditions along the wall in the die-off area, I don't think any additional channels at the wall will really help with standing water there. I think it is more of an issue of lower ground levels,either as a result of the construction of the wall or compaction from work and maintenance along that area. We did come across a few spots within the die-off area that were holding water for longer than surrounding areas. It may be possible to improve flushing in these isolated areas with some additional small channels that would tie into the larger ones already in place. We are still mapping these areas along with potential small channel locations to present at a future meeting. Before digging any additional channels, I would like to get some survey information relative to ground elevations through the die-off area from the wall out to the Bay. This will let us know if the standing water is the result of frictional forces holding it back or if it is simply lower ground elevations that would not drain even with channels installed. Most of these areas located so far are close to channels that have been dug already but with just enough distance that they are not reacting as quickly as those areas immediately adjacent to channels and therefore holding water longer to the detriment of seedling recruitment and healthy older trees. We are working on determining where the best locations are for these survey transects as well as potential new channel placements for submittal to the Committee at the January meeting. w , a for 341-4- r s � . qh « .4 , ' "F= - ,A... i: 4!...1". ,,, 4.; f.! t\;', /. .,efike 1,!Ilk t , ..., .c.,, 4 ,,,,A ,4 ,44 f.-4;:-.„ .40:7,-.i. ,r. ). wcift ., .,t 4. ' 3j ',. 11' .4r m�•• J '"rs .. i - ' it yt �X r., , ,,,,,,,i',;-",... .,.: - . . „.- ',.. , ,. , 4..,,,...„. lir i ,, ,,,,,‘, , ,,.! __ , i . ; . .,- . „.... . , ,I, - 1-,/1i, Iiimirilik , . . ,.. .,,,„ . -,,,,, , , z, iir .' , ii. .... - L, i, . . . , , \ ,,,,„„. 1.*:.,,,, -: .. , , , ., ,..„ - -. 4i.'-,, 4' A-,%, " r i 1- ' - .40.7.-!'.--. Zz ' "'let Standing water in die-off area that could benefit from an additional flushing channel. s , # ,� t ' 1 i i q- 4. d ..- I t 3 it 1, „ , . , .,,. E „4011k wt 1 , e 3 8 E Another small area of standing water in die off area that may benefit from an additional flushing channel. Based on the field work conducted to date I do not believe that there is much that can be done with respect to eliminating all the water along the Strand and Bay Colony wall through additional channel construction. If we wanted to fill in that area to match the adjacent ground elevations then that could eliminate the standing water there but would take a substantial permitting effort to be allowed to do so. The area would still be a mangrove wetland, but would be at about 3 to 4 inches higher elevation than it currently is. This will be a difficult concept to get agencies to agree to as in their way of looking at things we would be putting fill into a wetland. However,there may be a few small side channels that could be put in to help out in the interior of the larger die-off area. Survey information would help to make the final determination of the viability of new channels. I would still maintain that the most important item to keeping water elevation down to healthy levels is insuring that water can get from Upper Clam Bay to the Pass. Any blockages in the smaller waterways between Upper and Inner, or between Inner and Outer Clam Bays needs to be monitored and maintained as quickly as possible. This is in addition to the maintenance of the Pass itself to insure that all the water within the Clam Bay system can flow as freely as possible. Sincerely, Tim Hall Senior Ecologist Vista Data Vision -Vista Engineering Page 1 of 1 Pelican Bay:Clam Pass Tidal Stations Harker 32 latest time:9.1200 AM 12/1 2.897- -1 Not tate <`3- 11-1 —0.95 p Lvl_ft_Avg:Pelcar.Bay Cfarn Pass M 1.18 i -,:,.4 r T _F_Avg:PeficanBay Clara Pate 71.7 2.5- -,t.95 2.4- -11.8 Z2_ - .73,73 t,ry Lvl ft Avg:Pelcan6ay Clam Pass Marker 2- IM g -0,6� Mars Average P fl 7 1.401 0.259 Test F Avg;Pekcan8ay Clam Pass Mark l'{ _ ._. 1 055 Max Average Min 1.6-r.. ' 'I 1 -0 2 ..5 1tlt3.7 8436 6339 1.4_11,11 , h.,11 ilt 1,1i il Hi ! / 1 '1 , ,11 1 i '.„1, :::445 1 "I -,/ D,3- 11, '�' 0.5 ---- �II -0.15 , 111111 -COS 0..1- -COS 8.259-, , , , s 110 8:00:00 PM 3:4:4,03:&.,Vit 8:©0:00 PPI 8:00:00 PM 70,10:OO PM 7:00:00 PM 6/17/2016 319/ 9/8/2016 10/8/2016 11/7/016 16/2015 Ccrmest Ir Vets Erg-nee, EXHIBIT 1 http://dataJocherenv.com/vdv/VV.php?Type=V V&Station=Pelican%20Bay@@572&First=2016... 12/16/2016 Water Level(NG ft)&Rainfall(in) k." c to ve. A v+ iT. 3/1/2015 . . - . i . . . . i . . - t . . . - # , . . t - . - . t . .- . , i I i i 3/11/2016 - �+ I 3/21/2016s? 5 ro 3/31/2016 - r ) f t f lerto°•• 4/10/2016 3 Z `' r) o 4/20/2016 CD i 4130/2016 �..��js z 5/10/2016 - I I I [u 5/20/2016 l ? 5/30/2016 to 6/9/2016 1 m CIDj , rD to 06/i9120i6 i m 6/29/2016 r .rD 7/9/2016 i i[ a l711 9120 1 6 0 7/29/2016 } i € g 1 7- 8/8/2016 °6 8/18/2016Ir.-—i a ijtt a, 8/28/2016 tt al 9/7/2016 v _ Z 9/17/2016 -•[: =1"-- t 9/27/2016Nt___±.. ri a o.c 10/7/2016 -�.. rn .......• 3 10/1712016 c Is 10/27/2016 ) F* s,,, 11/6/2016 - ai !7' 11/16/2016 - ..___._---4-1 m 11/26/2016 111 12/6/2016 w r n EXHIBIT 2 Weather History for Naples,FL i Weather Underground Page 2 of 5 Actual Average Record Year to date precipitation 3423 36.76 Snow Snow 0.00 in -[] Month to date snowfall 0.0 Since 1 July snowfall 0.0 Since 1 September snowfall 0.0 Snow Depth 0.00 in Sea Level Pressure Sea Level Pressure 29.89 in Wind Wind Speed 14 mph[SSE] Max Wind Speed 28 mph Max Gust Speed 43 mph Visibility 8 miles Events Raln T=Trace of Precipitation,MM=Missing Value Source:NWS Daily Summary Daily Weather History Graph Tempera= Dew Point Normal FGgh/Low C 95 — 35 80 - .. t J..a. 1 4 3 . € ! � . ._ 27 75 - G `r 24 rnidnightl 2 34 5 8 7 6 9 10 11 noon 1 2 9 4 5 6 7 8 8 10 11 in Hg Barorne9lc Pressure hPa 30.0 299 - 1(173 i. . t ...1 '__ t. ) 1009 2�midnight! 2 3 4 5 6 7 8 9 10 11 noon 1 2 9 4 5 6 7 8 9 10 11 F 4y Vinod Dust knit • • mldrigtt1 2 3 4 5 6 7 6 9 10 11 noon 1 2 3 4 5 6 7 8 9 10 11 3600 f7 sd Dir(deg) 2709 1809 -S ! 4.. • . •" .arm e' . 909 -€ '. d a t n�dnig tl 2 3 4 5 6 7 8 9 10 11 noon 1 2 3 4 5 6 7 8 9 10 11 report this ad I why ads? EXHIBIT 3 https://www.wunderground.comlhistory/airport/KAPF/2016/9/1/DailyHistory.html?reitcity=Na... 12/16/2016 Agenda Item#6e jt\, t x • ,' "..--t. 4 :� is j{r vifiet, - 4 G. fi o t • . i • - 4, i "; f',:s.ttoc',,.1411, Yp t,. : ''' ' r4 . 10,4„,), fa ti .� 1 +e : a * ' _,.../",r k' . � r 4. as 11 r--"- 'c csIttto., w Oji s+I .. �` w.- -----„.--- ( i ,y ,� ry. I ,\11 t wy s� W 1{ u ti ' ', '' x , e °.14' r r w c s l ::' T < 1 v se: �hY OS - v. 71:11, 1‹ r-Nt:4,-''' '-‘° .st,,,,,_;:, :f �` o .� 'tk: el 11 „ ' III P Lior- 'Alp - -'J^ '.�L� q !! t�„ is? V ��rr �r } kNeo.... C, / - i '' ”., '11.P .11:40114 4,0-- e 11:--17-..?? , e* 1 .is ,.- ti r' % 1 6 --1, `. Ir ��ti, y �. 1) i, ,�11 ,f ` ''' '.;:''''';--2-8 :::-..7...f,1:1/'; ='^'C� �1 a ! --... �`� `� ...., ,e,----,....\,, ��r*� f ' ,� L , �� vt /. i., /// , . i. 'R ilk ,. «� _ H i ''' ^**- -T4.,/. II-- - -- 4.• %....,0,,- 1 • .....-;, :....,,I., 4 .-- ., ? -- -.,„'; ~ , *it'-4 ".-' Is—e,ir/,4,,,4,, - `f{icn; Ik \ ---- ,,..„ - 1” x' 1 / _vT-`-moi / "" 'et 64 s 4 rim— i „,� ' ',- ' r cc-1*-;4-7k,, \ \ \ ) \\\,. . _,_. R "`��.. Hand Dug Channels (GPS) Channel Depths Approx NG to Top of Muck 1 : // < 6 inches ',..r . „.,,,0. `�� 6 to 12 inches �, 7. . > 12 inches THA Hand Cut Channels 0 O 11 600 i �J�f Feetw. , ,. jsj N pith reo HAND CUT CHANNELS T T N -. '-' EARTH TECH ENVIRONMENTAL, LLC A INFRARED AERIAL OVERLAY PELICAN BAY 1455 RAIL HEAD BLVD, SUITE 8 1 (`,.11'.,« ('',.,,,s4♦> L1nrirl' ,.t NAPLES: FLORIDA^34110 . ^n^ '^ ^ ,,,,c STEETNo DATE I PROJECTNO. I SCALE Agenda Item#6f wcv w„r a•... s r �.*� G �r ie..'p.r- "" pit T r. Page 1 of 1 Map#3 of 3 i�n•�r" f 3�Ka lF r � ¢SAW'siC a V .;i { Vanderbilt --.4..' at t1. if = . *is . ...v qc 441lr �z c f 1„ \'0 i Park }. ci om i-1+. v; F 4a 4 {�,�/ F-,. lc:'.. „41 S 44.-.. IMt. .,e441,414'4g/it` Rpa*prs is _..j r-...,•, I `� y� .„, 4,„,,,,,,,,,,,...t VAlyp..�.E tw . ,1 .�. :SI_ .: �( _..r8��R0 i 1s.. r a...J ',' x moi, 21, al1; +�` °ti -moi l ., y- tw, tai 10 i ,rtr 1 y} 1 .=r .y ir++sv 1 j iA t ', , ;r - ,ti `-: +i - yg + �►,�uirrtra 'n 9 i: '. ,..tZdF- 4407 3 el `. `drr # ►•r � A fid` ry emir 4 -14 .44/000_0111704111 "Vi. , '''': rn o ! ,l „4,,,:...,:,:•,...., � n� � > � �� ? IA '4i��',itl b lar'' ��' �, ,mer ' �yrr ,,,, r• ,4",,,,, 10. )1:: ' �� e :N- E- kk,b � �a`t '4 f, .{p � .t.-y fit,{, ' .i4 � '..� .. a "SMIk' a �1 a t ? 1't� }q 4,'„e't. G ,..y, a'.:� r s s �r 1 '' ...... ;lt4 i Vanderbilt Beach Park Public. Acres • �?. , 4 - s „+�” 9 .�F...tt ^$ i. ZY sA � isf� 9+:y a. .. .g m f , os ,, , f M 4. {y } V��• 55 F -�! sDurls:a ,,,,,,,,,\:,. y�� . a•+� r £ 1, ••.wa S} r t ,, m +, - -- L at. rl4 �. uYY i "� T ,'; �� ri ". �l tyG a 74�i will A 1 < x % #]. wt �. a.. it's !_ f'Q r .i 4 t' ,• ^tq; f 'i j . i -' : , ?-' lir'''..4:1 4410: ‘%:4• A i ,'*�+'�'At;i�+`"� �� ids: Vanderbilt Beach-Clam Pass Coastal Barrier t x,:1: f �;r - ::),11,4N1...,..7 � � `ConseryationArea/NRPA Preserve* t « ter+"e 1 } /r 3and Beach Parks-Public Access '; +„ ,' d , Ift Re56'iCtions,Protective Covenants, Clara.P3.�S . + S ti A . Easements and Bitch Access Legend Park sum awatk. '_` I, Yi/. y> T 4 Area. ' '''�• ' . Dcd d Restricts OR 966 Oe9°t dose 1832 41)) ty - " y 1 �. Pared 1(0°114 OR 986(R9O1 des.1650) '*i j. r �, 190 i;rr1 l ._ a Parcel 2(Coresr»tion}OR 966(i°gal 6.6.18°R 3'7} z... T is -Y' .... t,„ 4.: _ (! •8.8 i e 1 Easement OR 966(1.2°1 dos 5843) y , ' tr..,'SS "- :a `:I �, i Ezcepied Out°rens OR 96fi(tegat dose 7837 t3) ., s py " .6! Li Vanderb9t Beach Public Access OR 956(bgat doss 1673 75) _ a d., Seagate Or Public Rood.Across OR 1236(icyol doss 7373) ..• �� ,� 1 A ge j I Consaroeon Easement OR 1526{foga!deu 57-56) 'p _ 4 ,.(( i"^le�F ft SEAriAT OR ^�. ± AI!•117fE M. rwrttaty 28,1995 Conservation Area also tlesigrtated * *}�'t '4 "f ,11 %^,* i F. as Clam Baq Natural Resources Protection Arai(NRPA) .ae.al•• 7 o f 7 •S t.a G t w i.. ;,„.... . * a (414-- M th' .t .4441.1 �t_. _L=s Vii_ �c .c..... .a COLLH R COI NTY PROPERTY APPISER ' G !_� GEOGRAPHIC INFORMATION SYEM ww "/�. 2011 AERIAL PHOTOGRAPH IF .«.....,ti.a.,...a,�..�,�v 1 t:Kn.soore.t eaux • °se's•-,,,,.-�