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Agenda 11/09/2016 PELICAN BAY SERVICES DIVISION Municipal Service Taxing and Benefit Unit NOTICE OF PUBLIC MEETING NOVEMBER 9, 2016 THE CLAM BAY COMMITTEE OF THE PELICAN BAY SERVICES DIVISION WILL MEET AT 1 :00 PM ON WEDNESDAY, NOVEMBER 9 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 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 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://PELICANBAYSERVICESD IVIS ION.NET. 09/22/2016 9:43 AM PELICAN BAY SERVICES DIVISION CLAM BAY COMMITTEE MEETING SEPTEMBER 28, 2016 The Clam Bay Committee of the Pelican Bay Services Division met on Wednesday, September 28 at 1:00 p.m. at the SunTrust Bank Building, 801 Laurel Oak Drive, Suite 302,Naples, Florida 34108. In attendance were: Clam Bay Committee Bohdan Hirniak Susan O'Brien, Chairman Gary Ventress Pelican Bay Services Division Staff Mary McCaughtry, Operations Analyst Neil Dorrill, Administrator Lisa Jacob, Associate Project Manager Marion Bolick, Operations Manager Barbara Shea, Recording Secretary Also Present Tim Hall, Turrell, Hall & Associates Dave Trecker, PBSD Board Mike Shepherd, PBSD Board Kathy Worley, Conservancy of SW Florida Jeremy Sterk, Earth Tech APPROVED AGENDA (AS PRESENTED) 1. Roll call 2. Agenda approval 3. Approval of 08/31/16 meeting minutes 4. Audience comments 5. Mangrove die-off a. THA September report b. H&M tidal ratio data for September c. Hand-dug channels d. Intervention strategies e. Possible impact of dune swale work f. 2016 infrared aerial photo 6. Clam Bay monitoring, work, and reports a. Tree trimming and exotic removal in FY16 b. Timeline for 2016 annual report i. Part 1 —on Objectives 1, 4, and 5 of Man. Plan ii. Part 2 —on Objective 2 of Man. Plan iii. Part 3 —on Objective 3 of Man. Plan c. Aerial photos d. Maintenance of tidal gauges e. Revised monitoring of mangrove plots for 2016 f. Sea grass exhibit 7. Water quality a. Copper data for July 1 Pelican Bay Services Division Clam Bay Committee Meeting September 28,2016 b. Tomasko quarterly report on total phosphorus and total nitrogen 8. Osprey nesting platform 9. Next meeting: November 9 or 10 10. Adjournment ROLL CALL All members were present and a quorum was established AGENDA APPROVAL Mr. Hirniak motioned, Mr. Ventress seconded to approve the agenda as presented. The motion carried unanimously. APPROVAL OF 08/31/16 MEETING MINUTES Mr. Ventress motioned, Mr. Hirniak seconded to approve the 08/31/16 meeting minutes as amended. The motion carried unanimously. AUDIENCE COMMENTS None MANGROVE DIE-OFF THA SEPTEMBER REPORTS Mr. Hall estimated the mangrove die-off area has expanded to 11.46 acres of concern with the addition of 4/10 acre in front of the Strand, although some seedling recruitment can be observed in this area. Mr. Hall is not recommending new hand-dug channels at this time, and will continue to monitor the die-off areas. 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. Ms. Worley, Conservancy of SW Florida, reported that she monitors 12 Clam Bay plots annually in March, and will provide her reports to the PBSD. She has observed fungus in stressed mangroves. Ms. O'Brien commented on a possible contributing factor of the mangrove die-off as being water run-off from Bay Colony Drive into Clam Bay. Mr. Sterk suggested an additional possible contributing factor as being the poorly functioning Bay Colony condo drainage structures. Mr. Dorrill commented that he will pass along these concerns to Bay Colony, as these concerns are not the responsibility of the PBSD. Mr. Dorrill reported that staff is currently in the process of updating our dune swale maintenance project. He will work with LuAnn Giovannelli and the Bay Colony Association Board, and will pursue a cost-sharing agreement. Mr. Dorrill will explore the set-back documentation for the retaining wall on Bay Colony Drive. H&M TIDAL RATIO DATA FOR SEPTEMBER Ms. O'Brien commented that the variability of the mean tidal ratios has continued. 2 Pelican Bay Services Division Clam Bay Committee Meeting September 28,2016 HAND-DUG CHANNELS Mr. Hall commented that he is not recommending new hand-dug channels at this time. INTERVENTION STRATEGIES By consensus, the committee chose to continue with monthly "mangrove die-off status reports" (by Turrell, Hall &Assoc.) for the next six months,through March 2017. POSSIBLE IMPACT OF DUNE SWALE WORK Ms. O'Brien commented on her concerns of the PBSD dune swale work resulting in additions to the standing water in Clam Bay. 2016 INFRARED AERIAL PHOTO The new July 2016 Clam Bay infrared aerial photo is on display in the PBSD office. Ms. Jacob commented that an aerial photo is taken annually; the next photo will be scheduled for July 2017. CLAM BAY MONITORING, WORK, AND REPORTS TREE TRIMMING AND EXOTIC REMOVAL IN FY16 Ms. Jacob reported that the current contract for Clam Bay exotic removal with Earth Balance expires on Sept. 30. She will request a quote from Earth Tech for targeted exotic removal services in FY2017, based on Mr. Sterk's exhibit of identified exotics in Clam Bay. TIMELINE FOR 2016 ANNUAL REPORT By consensus, the committee agreed on Dec. 15 as a target date for consultants to submit their components of the 2016 Clam Bay annual report. By consensus, the committee suggested obtaining a bathymetric survey in November and May of FY2017. Mr. Dorrill commented that he will bring this issue to the PBSD Board on Oct. 5 for approval; only one bathymetric survey is included in the FY2017 PBSD budget. AERIAL PHOTOS Ms. O'Brien expressed her preference in utilizing one plane to take all of the Clam Bay related aerial photos. MAINTENANCE OF TIDAL GAUGES Mr. Sterk reported that on average he receives notification of performance issues of a tidal gauge twice per month. He noted that although a tidal gauge may not be transmitting, the gauge's data is never lost. REVISED MONITORING OF MANGROVE PLOTS FOR 2016 Mr. Sterk reported that he is in the process of changing the Clam Bay mangrove plots by adding additional plots in the die-off area, and abandoning some of the older Lewis plots. SEA GRASS EXHIBIT Mr. Sterk reported that the sea grass in Clam Bay has increased by approximately 1/2 acre. 3 Pelican Bay Services Division Clam Bay Committee Meeting September 28, 2016 WATER QUALITY COPPER DATA FOR JULY Ms. O'Brien commented on the copper data provided by the County Lab for July, which showed copper exceeding FDEP acceptable limits at three sites. She reported that the County Lab has provided two sets of distinct results for each of the past two months. The committee expressed concerns over the quality of the County Lab work, and may consider using Benchmark Lab in the future to obtain more consistent results for copper. Dr. Trecker suggested the possibility of copper from the sediment in Clam Bay going back into solution during the high rainy season, causing higher readings. TOMASKO QUARTERLY REPORT ON TOTAL PHOSPHORUS AND TOTAL NITROGEN Ms. O'Brien commented that the 2" Quarter Tomasko report shows five "exceeds" for total phosphorus; the backup detail report show four "exceeds." Mr. Hall will contact Dr. Tomasko for clarification. The report shows one "exceed" for total nitrogen. Mr. Hall commented on a new rookery containing approximately 80 nests, on a Clam Bay island, which is a new source of phosphorous and nitrogen. OSPREY NESTING PLATFORM Ms. O'Brien thanked staff and Mr. Sterk for their work on the completion of the osprey nesting platform, recently installed just south of the Marker 36 Restaurant. NEXT CLAM BAY COMMITTEE MEETING By consensus, the committee agreed that the next meeting of the committee would be held on November 9 at 1:00 p.m. ADJOURNMENT [The meeting was adjourned at 2:37 p.m. Susan O'Brien, Chairman Minutes approved [ ] as presented OR [ ] as amended ON [ ] date 4 Agenda Item#5a Page 1 of 3 TURRELL, HALL & ASSOCIATES, INC. 7, 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: October 27,2016 RE: October Report on Mangrove Die-off status DIE-OFF STATUS The weather wasn't perfect this month due to some upper winds and hazy conditions but we are able to see that the die-off area does not appear to have expanded any since last month's flight.The hazy conditions made it difficult to see if the chlorosis identified last month had gotten worse but from the ground level observations it does not appear to have. The September report stated that the dead acreage estimate was 11.46 acres.Based on the aerials and ground level reconnaissance it does not appear that many changes have taken place in the past 30 days. Hopefully the area has stabilized and will start to gradually recover now. We are still seeing some seedling recruitment going on in these areas. The October estimate is therefore left at 11.46 acres of concern. Water levels were pretty high at the time that we did our ground trothing but that appeared to be due to high tides and not a flushing issue. A later site visit during low tide a couple of days later showed that water levels had dropped as well. My biggest remaining concern is how the system will respond if we get a strong freeze or frost this winter. As the trees are already stressed my concern is that more than normal could succumb 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#5a Page 2 of 3 ' ; �35 *�{� £�t air �'&j,.:411,44,-t.". ,kit ', ��,<»: ' r , . - `e R 1,7,y '.. ° ` €� k3 � , 84'4 ` rte �' � � � � �� �� } -� � ��� "��# � .� �� %s 'i i- , " b T +. ..L,.t., #' , „+E 2 y Area of concern east of the Strand (September) --t x . a :4 gyp. ' . �€'�z ¢°�r c N" ,fit t+ s :-.1-1'''''' _, t .+,4 a '£a e[s+ , : s ♦ ,4- • - + - 41s "' te . 2 s s,is r Area of concern east of the Strand(October) In s »U Q ca to W • k � `fit llit,_.„ II 111 � Z c !011000 : illilesm '- , _ m �©©000 0 r. t3 o � 11111 0 0 tr a 7 N to za. Li 4 2 i w -L-_:-. -) 1 Q co s % in ., �, , , A .- ,, 0 ,‘ j H 1, d Z V Q lJL F—' u VP,.:q, TAT O y O+ + ., C z O '.b •p +!' 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DSC_1672.jpg Humiston&Moore Engineers Agenda Item#7a Page 1 of 2 Clam Bay Copper ug/L Collection Date CB1 CB2 CB3 CB4 CBS C86 CB7 CBS CB9 Report Date 6/22/2016 0.862 0,700 0.700 0.700 1.640 2.100 0.700 3.520 1.510 9/8/2016 7/20/2016 0.924 5,330 5.110 5.660 2.470 3,960 4.950 5.710 10.500 9/12/2016 7/20/2016 0.924 6,160 4.700 1.690 2.470 1.830 1.980 1.870 8.360 9/21/2016 8/25/2016 2.000 1,850 1.680 1.470 1.240 1.520 2.250 1.280 8.060 10/4/2016 ISI 1 Agenda Item#7a Page 2 of 2 Clain tcy t 9pper dal» Clam Clam Clam Clam Clam Clam Clam Clam flay 1 flay 7 Hay 3 Hay 4 Hay S Bay 6 Bay 7 Ray 8 flay 9 . • • • • 3/;)/ f; I•54 it) 10 112 0.50 0.35 0.35 0,35 035. 035 /6/15 4,97 3.93 4.68 3.50 3,00 3.50 3,00 3,00 3.00 4/29/I 5 4.70 4.49 3.39 0.65 4.73 1.71 0.94 169 1.51 S/26/15 4.49 2,66 1,24 1.37 0.27 0.27 (1.35 0.36 1.91 6/30/15 3.04 2.16 0,47 3.08 0,27 0,27 2.04 0.27 0727 7/16/15 4,91 1120 4.15 7.66 1.58 4.14 7,12 328 1.53 8/26/15 0.1111 146 1.09 1.43 7.10 1.05 4.36 .4.60, 3.61 9/16/15 2.77 11.60 3.10 2.19 054 0.50 0.90 0 77 0.39 10/21/15 1./15 1.30 0.1135 1.76 0.272 1.20 136 0.551 0.547 11/17/15 2.39 221 216 1.75 1.09 0.064 1,37 0.910 0,604 12/09/15 2.037 4.306 2.631 0.272 0.272 0.530 0.901 1.415 0.272 1/13/16 3.09 0.91 4.29 2.15 1A4 1.17 0.054 0.550 0.510 2/25 16 3.46 9.413 1.70 2.14 0.272 0.272 0.411 0.270 0.272 1/23/16 1.118 2.00 0,679 0.500 0.500 II 500 0.500 0.500 0.500 ( 3/z3/ ti 6172 1,05 0,272 0.272 0.272 0172 0.272 0,272 (11/2 t4ena,1r 4/27/16 0.270 0.270 0.270 0.27(1 0.270 0.270 0.270 0/70 0170 5/25/16 2.02 2.68 2.32 6.42 2.07 2.70 4.00 1.07 0%1 ',II ‘.1 VOIA.111tt Agenda Item#7b 4350 West Cypress Street Page li oA6esassoc.com Suite 950 Tampa,FL 33607 813.207.7200 phone 813.207.7201 fax memorandum date October 6, 2016 to Tim Hall, Turrell, Hall and Associates, Inc. from David Tomasko, Ph.D. Emily Keenan, M.S. subject Quarter 3: Clam Bay NNC SSAC evaluation Background The United States Environmental Protection Agency (EPA) and Florida Department of Environmental Protection Agency (FDEP) adopted site specific alternative nutrient criteria (SSAC) for Clam Bay, as listed in Florida Administrative Code (FAC) 62-302.531. The SSAC were derived based upon a nutrient: salinity relationship from the Estero Bay Wetlands, a reference waterbody for water quality, as established by FDEP in prior TMDLs. The SSAC for Clam Bay is considered in the context of salinity due to the variability in nutrient concentrations that can be due to changes in freshwater inflow, rather than changes in nutrient concentrations alone. Therefore, the appropriate management response associated with any impairment determination is based upon the magnitude and duration of any exceedances. Based on prior work that showed that phytoplankton growth in Clam Bay was likely stimulated by both Total Nitrogen (TN) and Total Phosphorous (TP), both TN and TP are used to determine the degree of nutrient enrichment of Clam Bay's waters. As outlined in FAC 62- 302.531, water quality status is determined on an annual basis, preferably within a calendar year. Within a calendar year, each individual TN and TP value collected within the waterbody is compared to the nutrient: conductivity 90th percentile prediction limit (Figure 1), and an annual percent exceedance is calculated to determine the magnitude of exceedances per year. To be consistent with the method currently implemented by FDEP to identify impaired water bodies, if 13 percent or more of the TN or TP values in a calendar year exceed the 90th percentile prediction limit (after being normalized for conductivity) the duration of exceedance would then be determined. Based on the duration of exceedance (one year or greater than one year), the outcome designation is assigned. If fewer than 13 percent of the values exceed the 90th percent prediction limit, then the outcome is "0". If the magnitude (i.e., 13 percent) and duration (i.e., less than 1 year) of the exceedances are deemed small, the outcome is "1". If the magnitude or duration of the exceedances is large, then the outcome is "2". If both the magnitude and duration of the exceedances are large, then the outcome is "3". The Agenda Item#7b Page 2 of 6 management response for Clam Bay would be determined based on the outcomes assigned to both the TN and TP evaluations for the magnitude and duration of exceedance (Figure 2). The water quality status of Clam Bay would be assigned a green, yellow, or red designation annually based on the magnitude and duration of exceedances of the 90th percent prediction limit. The color designation is then used to determine what level(s) of management actions are appropriate. Annual management response actions are based on the response to nutrient concentrations of phytoplankton and dissolved oxygen (DO) as well as impacts on water clarity (Figure 3). If the outcome of the TN and TP evaluation is green, then no management actions are required. However, if the outcomes are yellow or red then further evaluation of the effect of elevated nutrient concentrations on both phytoplankton biomass and DO concentrations need to be reviewed. If there is no relationship between nutrients and chlorophyll-a or DO, then no management actions are required. If there is a signification relationship, then the impact of chlorophyll-a on the water clarity (Secchi disk depth) would be evaluated. If there is no relationship between chlorophyll-a and water clarity, then no management actions are required. If there is a significant relationship between chlorophyll-a concentrations and water clarity, an outcome designation of"yellow" (indicative of small magnitude or duration of exceedances) identifies that management actions should be taken to identify the potential causes and responses for the elevated nutrient levels. It the outcome designation is "red" (indicative of a large magnitude or duration of exceedances), management actions should be taken to implement recommended response tactics to reduce nutrient concentrations. In this manner, the "health" of Clam Bay is to be assessed annually. Figure 1. Clam Bay water quality flow chart. Do>13%of all TN Nor IP values from a calendar year exceed the 90%oredict on limit No from the reference MHO,' I i Outcome° Yes >_13°f° Ma nitudeof >15 °l° exceedance Duration of Duration of exceedance exceedance 1 year >1 year 1 year >1 year Out<orr e1 outcome.1 ome) Outcome3 2 Agenda Item#7b Page 3 of 6 Figure 2. Management response matrix using outcomes from both TN and TP evaluation. Total Phosphorus Total Nitrogen Outcome 0 Outcome Outcome 2 Outcome 3 Outcome 0 Outcome 1 Outcome 2 Outcome 3 1 Figure 3. Management response actions in response to various outcomes. Green Response Yellow or Red evaluation ?old t lrr Evaluate phytoplankton/ Significant dissolved oxygen (p<O.OS) Not significant response to nutrient (p>o.os) concentrations Evaluate water clarity nut sibnifliant response to chlorophyll-a (ir,0.05) Significant(p<{I.05) Small difference or short duration identify potential causes and implement , Identify potential recommended response Large difference or causes and long duration responses 3 Agenda Item#7b Page 4 of 6 Data Analysis The analysis conducted below was used to assess the water quality status of Clam Bay during the months of May 2016 to July 2016. Since the SSAC developed for Clam Bay is to be evaluated on an annual time step, this analysis provides insight into current water quality conditions within the Bay, but it does not substitute for the more comprehensive annual assessment required. Clam Bay surface water quality data were provided by Turrell, Hall and Associates, Inc. for comparison with the FDEP adopted SSAC established for Clam Bay and found within FAC. 62-302-532 -1-j. The NNC SSAC states the following; "No more than 10 percent of the individual Total Phosphorus (TP) or Total Nitrogen (TN) measurements shall exceed the respective TP Upper Limit or TN Upper Limit." The TP and TN upper limits are calculated using equations 1 and 2: Equation 1: TP Upper Limit (mg/L)= e(-1.06256-0.0000328465*conductivlty(ps)) Equation 2: TN Upper Limit (mg/L)= 2.3601 — 0.0000268325*Conductivity(pS) The dataset was supplemented with in situ water quality data (e.g., temperature, dissolved oxygen, pH, conductivity, and salinity) retrieved from the chain of custody forms for each sampling event. The corresponding TN or TP Upper Limit was calculated for each Clam Bay estuarine water quality station and sampling date in which conductivity was available using Equations 1 and 2. TN and TP concentrations were compared to the derived upper limit thresholds to ascertain if elevated concentrations were identified (Appendix A). Over the period analyzed (May 2016 to July 2016), a single ambient water quality TN measurements exceeded the respective TN Upper Limit. In comparison, 7 of the 27 (26 percent) TP measurements exceeded the respective TP Upper Limit. Based on this time period, the frequency of exceedance, if maintained over the course of a calendar year, would not be determined to be impaired for TN, but it would be impaired for TP. With a likely non- impairment for TN, but impairment for TP, the next topic to be addressed is the duration of the exceedance. If the TP exceedance lasts only a year, the outcome for the flowchart shown in Figure 1 would be given a score of"2" for TP. As stated above, outcome "0" is expected for TN. After one year, the combination of outcome "2" for TP and outcome "0" for TN would result in a "yellow" management response, as illustrated in Figure 2. If the next quarterly report continues to have TP criteria exceeded, then the "yellow" management response would be the outcome for this first year's data collection effort. This would require the annual report to include the following tasks: • Determining the relationship, if any, between TP and chlorophyll-a • Determining the relationship, if any, between chlorophyll-a and dissolved oxygen • Determining the relationship, if any, between chlorophyll-a and water clarity 4 Agenda Item#7b Page 5 of 6 Depending upon the findings of the analyses listed above, management implications would be developed, which could range from recommendations up to and including the need to determine the basis for a potential adverse impact on water quality. The TN exceedance occurred at Clam Bay 2 on June 22, 2016. In contrast to the previous reviews, the TP exceedances occurred predominantly during the May 25, 2016 sampling event at Clam Bay stations 1, 2, 3, 6 and 7. Additional exceedances were also reported at Clam Bay 1 on June 22, 2016 and Clam Bay 9 on July 20, 2016. In addition, the Clam Bay Outfall monitoring station results were compared to the proposed downstream protective values (DPV) for Clam Bay which are based upon "pristine" conditions of Estero Bay (PBS&J 2011). Outfall TN and TP concentrations were compared to the median and 90th percentile DPV values to determine if elevated concentrations were identified (Appendix B). The median and 90th percentile DPVs for TN are 1.31 and 1.8 mg/L, respectively. The median and 90th percentile DPVs for TP are 0.1 and .25 mg/L, respectively. For TN, 68 and 20 percent of the values exceeded the median and 90th percentile DPV values, respectively (Table 1). For TP, 68 and 20 percent of the reported values exceeded the median and 90th percentile DPV values, respectively (Table 1). Table 1. Percentage of TN or TP concentrations from outfall stations which exceeded the median or 90th percentile DPV values. DPV Total Nitrogen Total Phosphorus Median 90th Percentile Median 90th Percentile Below 32% 80% 32% 80% Exceed 68% 20% 68% 20% Findings It should be noted that this data analysis is not based on a full year of water quality data, and thus while it is indicative of potential findings for a calendar year, it is not necessarily predictive of what would be found with a calendar years' worth of data. The FDEP-adopted SSAC for Clam Bay requires data analysis on a calendar year basis (FAC 62-302.531). However, quarterly status reports can be useful as an early warning system if water quality appears to be significantly different from expected ranges. Preliminary evidence (see above) suggests that nitrogen concentrations in Clam Bay are not currently problematic. However, phosphorus concentrations within Upper Clam Bay exceeded the criteria in 26 percent of the samples collect for this period; additionally nutrient concentrations in stormwater runoff could be problematic if current values are maintained over time. 5 Agenda Item#7b Page 6 of 6 Elevated nutrient concentrations in some of the outfall sampling locations suggests that some of the TP concentrations in Clam Bay could be due to activities occurring on the watershed, and outfall sampling should continue. However, while TN concentrations exceeded DPV values in runoff, they were much less likely to exceed criteria for the open waters of the bay itself. These findings could be indicative of a condition wherein TN is "lost" from the system through the processes of de-nitrification, which would not be unusual for a wetland dominated waterbody where organic carbon is plentiful, and where dissolved oxygen concentrations would be expected to be naturally low. If so, the tidal prism for the Clam Bay system should perhaps be maintained such that it not only allows sufficient flushing of Upper, Inner and Outer Clam Bay, but also that it doesn't create artificially high flushing rates. 6 moo- ''rc4 e.w..-...,uc Clam Bay 2016 Mangrove Monitoring — Plot Summaries (5 Plots of 21) Clam Bay Committee Meeting November 9, 2016 TH-3 Located between outer and inner Clam Bay 92 living trees >2.5 cm tagged within the 10m x I Om plot 2015 vs. 2016 2 white mangroves died year to year At least 4 new trees reached the 2.5 cm threshold No significant differences in stress signs Plot is showing excellent recruitment of red mangrove saplings (not reflected in #'s due to size) ,,,...2'1`) � k , 'r ,fix S{(:•: wd„r_ '§� .Y 9 �d i � .,�. ,,, t,:-,f,,,.,4fr Cyt - .t+ ,0 � t4 , ,, - - t , r4,,, ./ ` r_f: 1s s EARTH TECH ENVIRONMENTAL,LLC 1455 RAIL HEAD BOULEVARD STE.8,NAPLES,FL 34110 1 www.etenviron.com IllwkwiddkitO TH-10 Located in the very north end of Clam Bay 48 living trees >2.5 cm tagged within the I Om x I Om plot 2015 vs. 2016 35.4% mortality of mostly white mangroves < 4.cm Further 23% of trees showing some stress, again nearly all white mangroves Plot is showing good recruitment of red mangrove saplings (not reflected in #'s due to size) , .,,,.,.i . ,,, .., I( -..,.,,,,, r,.„4,,,...,, ,,,,t,,,,,o,,,,, c.;{.:1,:.;I : '.-',4 ,t 4' :,:,. ..4.1:0, ,,, 43t, k'''' 1-.'"7-- * ', ‘°'-- " '' 1 ' ' ,,,,,"1.,,""::1 '-4, .`E4 q ''(''7,.';'''',,,' .''', � ik §7 kiln i . .. .:,,I., ,,1:iffi.,• , ' �,�r ti¢` 1` #' > ,44,. ., .4..., 4===;==i.1;'PIP; Ufi`s - tti'� _".-g 142 S a "=� 'l 9„. r .ft. ,�+., _ • � ,`ted a' a c - ,p1,, t- 4-4 ,; i '4:- a '� f Y t ! ‘-';',' .i‘ q 1 k= S t fi ' 9 j+i` 't4%1 -'''1",' * * 't,” 4 -. -.4, 4- -4 4 , - , 4, t 4 . _I, ,,„: F ft.,t, ° :',....44,1,7._ ! tla 7--X f3 4a" . ,,:‘,:- --,t- ! 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