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PBSD MSTBU Clam Bay Committee Agenda 03/08/2018
PELICAN BAY SERVICES DIVISION Municipal Service Taxing and Benefit Unit NOTICE OF PUBLIC MEETING MARCH 8, 2018 THE CLAM BAY COMMITTEE OF THE PELICAN BAY SERVICES DIVISION WILL MEET AT 1:30 PM ON THURSDAY, MARCH 8 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 01/04/18 meeting minutes 4. Audience comments 5. Water Quality a. 2017 annual report b. Sediment report C. Copper results for Nov. 2017 d. Update on WIN entry 6. Clam Pass a. February tidal ratio report b. Minimizing Pass migration C. Timeline for dredging-related activities d. Other 7. Clam Bay a. Update on debris removal b. Update on hand-dug channel maintenance C. Canoe trail marker 12 d. Bee sites 8. Clam Bay FY19 expenses 9. Clam Pass Park a. Parking garage b. Boardwalk to facilitate beach access 10. Meeting with Seagate representatives 11. Water Management and Clam Bay committees 12. Next meeting: May 1 or 3 13. Adjournment ANY PERSON WISHING TO SPEAK ON AN AGENDA ITEM WILL RECEIVE UP TO THREE (3) MINUTES PER ITEM TO ADDRESS THE BOARD.THE BOARD WILL SOLICIT PUBLIC COMMENTS ON SUBJECTS NOT ON THIS AGENDA AND ANY PERSON WISHING TO SPEAK WILL RECEIVE UP TO THREE(3)MINUTES. THE BOARD ENCOURAGES YOU TO SUBMIT YOUR COMMENTS IN WRITING IN ADVANCE OF THE MEETING. ANY PERSON WHO DECIDES TO APPEAL A DECISION OF THIS BOARD WILL NEED A RECORD OF THE PROCEEDING PERTAINING THERETO,AND THEREFORE MAY NEED TO ENSURE THAT A VERBATIM RECORD IS MADE,WHICH INCLUDES THE TESTIMONY AND EVIDENCE UPON WHICH THE APPEAL IS TO BE BASED.IF YOU ARE A PERSON WITH A DISABILITY WHO NEEDS AN ACCOMMODATION IN ORDER TO PARTICIPATE IN THIS MEETING YOU ARE ENTITLED TO THE PROVISION OF CERTAIN ASSISTANCE. PLEASE CONTACT THE PELICAN BAY SERVICES DIVISION AT (239) 597-1749. VISIT US AT HTTP://PELICANBAYSERVICESDIVISION.NET. 03/2/2018 1:43 PM PELICAN BAY SERVICES DIVISION CLAM BAY COMMITTEE MEETING JANUARY 4,2018 The Clam Bay Committee of the Pelican Bay Services Division met on Thursday, January 4 at 1:30 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 Andrew McAuley, Earth Tech Jennifer Bobka, Earth Tech Arielle Poulos, Turrell, Hall &Associates Mohamed Dabees, Humiston& Moore Jeremy Sterk, Earth Tech Tim Hall, Turrell, Hall & Associates Scott Streckenbein, PBSD Board Mary Johnson, Pelican Bay Foundation APPROVED AGENDA (AS AMENDED) 1. Roll call 2. Agenda approval 3. Approval of 12/07/17 meeting minutes 4. Audience comments 5. Clam Bay a. ETE annual report (see note below) b. Contract for debris removal from waterways c. Contract for debris removal from hand-dug channels d. Contract for hand-dug channel maintenance e. Contract for exotic maintenance along west side of berm and in coastal scrub f. Safety trimming along north boardwalk g. Canoe trail marker 12 h. Other 6. Clam Pass a. December tidal ratio report b. H&M annual report c. Other i. Escarpment ii. Next dredging event 7. Water Quality a. Discharge from Mystique construction project b. County Lab collecting water samples 1 Pelican Bay Services Division Clam Bay Committee Meeting January 4, 2018 c. County Lab entering WQ data for Clam Bay and berm sites into WIN d. Other 8. Next meeting: March 6 or March 8 9. Adjournment 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 amended, with the additions of items #6ci and#6cii. The motion carried unanimously. APPROVAL OF 12/07/17 MEETING MINUTES TMs. O'Brien motioned, Mr. Hirniak seconded to approve the 12/07/17 meeting minutes as presented. The motion carried unanimously. AUDIENCE COMMENTS None CLAM BAY ETE ANNUAL REPORT Mr. Jeremy Sterk, consultant with Earth Tech, provided and reviewed the 2017 Annual Clam Bay Monitoring & Management Report. Highlights of the report included the following: • The health assessment scores of mangrove tree plots declined in 2017 (March to September) resulting from the adverse effects of Irma. Mangrove recovery from Irma will continue to be monitored; four plots will be added to specifically monitor this recovery. • Coastal scrub vegetation monitoring shows scrub habitat, in general, is in good condition. • The observed gopher tortoise population shows an increase of approximately 18%; all tortoises appear healthy. • The acreage of scaevola (exotic plant) has increased, and it is recommended that the PBSD plan an exotic removal project to target this vegetation. • A dramatic loss in seagrass acreage has been observed, attributable to the June —August conditions in Clam Pass. Ms. Mary Johnson suggested that last season's increase in boat activity may have been a contributing factor to the reduction in seagrass acreage. • November/December water levels appear somewhat higher than a year ago. • There is significant hurricane debris in the hand-dug channels; the goal is to remove this material in April. • Recreational monitoring show markers and signage are in good condition except for Marker 12, which was uprooted during Hurricane Irma. • Archaeological sites are in good shape, with no signs of any disturbance. CONTRACT FOR DEBRIS REMOVAL FROM WATERWAYS 2 Pelican Bay Services Division Clam Bay Committee Meeting January 4, 2018 Mr. Sterk commented that he is working with Ms. Jacob to develop the specifications for the waterway debris removal project. CONTRACT FOR DEBRIS REMOVAL FROM HAND-DUG CHANNELS Mr. Sterk commented that the specifications for the hand-dug channel debris removal project will be developed subsequent to the completion of the waterway debris removal project. CONTRACT FOR HAND-DUG CHANNEL MAINTENANCE Mr. Sterk commented that the specifications for the hand-dug channel maintenance project will be developed subsequent to the completion of the hand-dug channel debris removal project. CONTRACT FOR EXOTIC MAINTENANCE ALONG WEST SIDE OF BERM AND IN COASTAL SCRUB Mr. Sterk commented that the project for exotic maintenance along the west side of the berm and in coastal scrub is out for bid and due back in two weeks. SAFETY TRIMMING ALONG NORTH BOARDWALK Mr. Bolick commented that his staff has completed the safety trimming of vegetation along the north boardwalk. CANOE TRAIL MARKER 12 Mr. Sterk commented that he will follow up with the County on reinstallation of Marker 12, which was uprooted by Hurricane Irma. CLAM PASS H&M ANNUAL REPORT Dr. Mohamed Dabees, consultant with Humiston & Moore, provided and reviewed the 2017 Clam Pass Physical and Tidal Monitoring Report. Highlights of the report included the following: • Conditions at Clam Pass are stable but critical, and will continue to be monitored. • An interim spring survey is recommended, if conditions remain as they are now, to assess the inlet prior to the tropical storm season. • Ms. O'Brien suggested discussing a plan to avoid an "emergency dredge." Dr. Dabees commented that although an emergency cannot be preplanned, he suggested contingencies be put in place to prevent a two month delay in emergency corrective action (dredging), if required, as occurred in 2017. Dr. Dabees commented that the Clam Pass Management Plan states that dredging or any intervention is a last resort. Mr. Dorrill commented that per a discussion held last summer, the County Manager is not willing to provide a "reserve" appropriation from the TDC, in case an emergency dredge is required. Mr. Dorrill suggested making an educational presentation to the TDC on Clam Pass, including how conditions can change quickly. Mr. Sterk suggested putting out an RFP to prequalify dredging contractors. 12/20/17 CLAM PASS AERIAL PHOTOS 3 Pelican Bay Services Division Clam Bay Committee Meeting January 4,2018 Dr. Dabees provided the most recent (12/20/17) Clam Pass aerial photos for review by the committee. ESCARPMENT (ADD-ON) Dr. Dabees and the committee discussed the current escarpment observed at PB South Beach. Dr. Dabees commented that escarpments are sometimes self-correcting and that beach management practice is that action should be taken if the escarpment is longer than 100 feet and higher than 18 inches. WATER QUALITY DISCHARGE FROM MYSTIQUE CONSTRUCTION PROJECT Ms. O'Brien commented that there is no longer any observable discharge from the Mystique construction project. Mr. Dorrill commented that the PBSD is eligible to review the Mystique's de-watering records. He directed Mr. Sterk to continue to monitor the Mystique. COUNTY LAB COLLECTING WATER SAMPLES Mr. Bolick reported that the County Lab will be collecting water samples, going forward, at a reasonable cost. The October WQ results are due this month. Ms. O'Brien reported that the Tomasko WQ report is expected prior to March. NEXT MEETING: By consensus, the committee agreed that the next meeting of the committee would be held on March 8 at 1:30 p.m. ADJOURNMENT The meeting was adjourned at 3:16 p.m. Susan O'Brien, Chairman Minutes approved ( 1 as presented OR 1 as amended ON ( 1 date 4 4350 West Cypress Street Nw esassoc.com Suite 950 Agenda item#5a Tampa,FL 33607 Page 1 of 14 813.207.7200 p znr 813.207.7201 fa\ memorandum date March 1, 2018 to Tim Hall,Turrell, Hall and Associates,Inc. from David Tomasko,Ph.D. Emily Keenan,M.S. subject Annual Report on Clam Bay Numeric Nutrient Concentration(NNC)Criteria Executive Summary Water quality data collected from Clam Bay between November 2016 and October 2017 were analyzed to determine the degree to which the waters of Upper, Inner and Outer Clam Bay are in compliance with relevant criteria. For nutrients, it was found that levels of phosphorous were out of compliance with existing site-specific criteria for Clam Bay. Levels of nitrogen were not out of compliance. Based on data from throughout the Clam Bay system, there is a positive correlation between phosphorous concentrations and the amount of algae in the water column, and an inverse correlation between phosphorous and levels of dissolved oxygen (DO). These results suggest that phosphorous concentrations are at potentially problematic levels in Clam Bay, and they should be carefully monitored, to ensure that conditions do not deteriorate. Should phosphorous continue to exceed established criteria; the County would benefit from the development of a detailed and data-rich phosphorus loading model, to develop appropriate management responses. Although this is supposition at this time, the temporal pattern of phosphorus exceedances suggests that nesting behavior of wading bird might better explain the temporal pattern of phosphorus enrichment than stormwater runoff. This potential link needs to be investigated in greater detail. Levels of DO are problematic when compared to newly adopted criteria developed by the Florida Department of Environmental Protection (FDEP). For DO, 13 of the 98 samples had levels lower than existing guidance criteria from FDEP, a value in excess of the 10 percentile exceedance rate allowed by FDEP. For copper, 16 of 98 samples collected in Upper, Inner and Outer Clam Bay exceeded FDEP criteria for Class II marine waters. Based on this exceedance rate, the waters of Clam Bay would be determined to be "impaired"for copper. The majority of the copper impairments occurred within Upper and Inner Clam Bay, at stations 1, 2 and 3, and special attention should be placed on determining the potential cause(s) of elevated copper at those locations. The determination of copper exceedances in freshwater sampling sites in the watershed requires the simultaneous collection of data on "hardness". Unfortunately, not all of the copper values from freshwater locations were accompanied by hardness values, so the degree of impairment cannot be fully investigated. Future sampling should include measurements of water clarity for all Clam Bay sites, and measurements of hardness for all freshwater sampling sites. Agenda item#5a Page 2 of 14 Background Over the past several decades, it has become well-established that an over-abundance of the plant nutrients nitrogen and/or phosphorous can have adverse impacts on the water quality and ecology of lakes, rivers and estuaries. Excessive nutrient supply can stimulate the growth of nuisance plants, creating nuisance algal blooms. In a system like Clam Bay, algal blooms can reduce water clarity, which is essential for the continued persistence of seagrass meadows, which provide food and shelter for the majority of recreationally and commercially important species of fish and invertebrates (such as crabs and shrimp). Once algal blooms die-off, their decomposition can reduce levels of DO, which is essential to most forms of aquatic life. Successful management of coastal waterbodies thus requires the collection, analysis and interpretation of results from water quality monitoring programs, particularly data related to nutrient amounts and sources. Determination of Impairment Status In 2012, the United States Environmental Protection Agency formally adopted nutrient concentration criteria for Clam Bay, as produced for Collier County, which had also been reviewed and approved by FDEP. The Numeric Nutrient Concentration (NNC) criteria produced for Clam Bay are termed Site Specific Alternative Criteria (SSAC) and they are listed in Florida Administrative Code (FAC) 62- 302.531. The SSAC for Clam Bay was derived based upon a relationship between salinity and nutrients that was initially established at one of FDEP's "reference sites" in Estero Bay. The need to take into account salinity was based upon the finding that nutrient concentrations in estuaries and tidal rivers vary as a function of rainfall and runoff, as well as the amount of tidal influence. For example, even in FDEP's reference sites, which were chosen to represent waterbodies with little to no human impacts, nutrient concentrations are lowest on high tides, in areas close to passes, and during dry periods with little rainfall-generated stormwater runoff. Even in these reference sites, nutrient concentrations increase as one moves farther away from passes, as the tide falls, and during wet seasons and wet years. Therefore, a single nutrient concentration criterion does not make much sense, if water quality data from even pristine locations could potentially pass or fail proposed criteria simply as a function of location, tidal stage or antecedent rainfall. The SSAC for Clam Bay therefore considers the concentration of nutrients, while also taking into account the salinity, such that a finding of elevated nutrients in combination with higher salinities is considered more problematic than elevated nutrients in combination with lower salinities. As such, the relationship between nutrients and salinity is determined as part of the process to determine if the waters of Clam Bay are "impaired" or not. Also, the frequency with which values exceed NNC criteria is taken into account when determining the appropriate management response, as is the amount of time over which an exceedance has occurred. For example, if nutrient concentrations were to exceed NNC criteria by a relatively small percentage, and if such an exceedance was to only last a short period of time, the appropriate management response would be different than if water quality was to exceed criteria to a larger extent, and if the condition of exceedance was to have lasted for a greater period of time. Therefore, the management response associated with any impairment determination is proportional, and based upon both the magnitude and duration of any exceedances. Based on prior work conducted in Clam Bay, it was found that the amount of floating microscopic algae (i.e., phytoplankton) in the bay was likely stimulated by both Total Nitrogen (TN) and Total Phosphorous (TP). Consequently, the amount of both TN and TP in Clam Bay is used to determine the degree of nutrient enrichment of Clam Bay's waters. As outlined in FAC 62-302.531, the water quality status of waterbodies is to be determined on an annual basis, preferably within a calendar year. For this report, the data collection effort comprised 12 2 Agenda item#5a Page 3 of 14 months of effort, but the 12 months did not fall within a single calendar year. Nonetheless, the compilation of results and the interpretation of results presented in this report should be fully consistent with that which would have occurred if the full 12 months of data had been collected in a single calendar year. As outlined in FAC 62-302.532, for each year, each individual TN and TP value collected within Clam Bay is compared to an "upper boundary" of the expected relationship between those two variables and salinity, which was originally informed by the water quality data from an FDEP-designated reference water body. The formal name of the upper boundary condition is the "90th percentile prediction limit" which was originally derived for the relationship between nutrient concentrations and salinity in Clam Bay, and which is based on the determination by FDEP that Clam Bay's water (in 2012) was sufficient to protect its biological integrity. In other words, a TN or TP concentration higher than the 90th percentile prediction limit is a nutrient concentration higher than at least 90 percent of the values that would be expected, after taking into account the salinity value at the time that the water quality sample was collected. The number of occasions when a nutrient concentration is higher than the 90th percentile prediction limit is quantified for each year, and an annual percent exceedance is then calculated. To be consistent with methods currently used by FDEP, if more than 13 percent of TN or TP concentrations exceed the 90th percentile prediction limit (for a given year) then the year as a whole is classified as one where water quality is out of compliance with the existing criteria. If fewer than 13 percent of the values exceed the 90th percentile prediction limit, then water quality is not considered to be out of compliance. If more than 15 percent of TN or TP values exceed the 90th percentile prediction limit, then the degree of impairment is determined (as per FDEP guidance) to be more problematic than if only 13 percent of values exceeded the established criteria. The screening of water quality data against the adopted NNC criteria is performed as outlined in Figure 1, where different outcomes are given different scores, depending on the frequency of impairment, as well as the duration that the impairment has lasted. Figure 1. Flow chart for determining water quality compliance in Clam. Do>1 %of ali fN&forTP values from a calendar year No exceed the 40%prediction Writ from the reference W8ID Outcemel3 Yes Magnitude of ?1.5°0 exceedance Duration of Duration of exceedance exceedance 1 veal `-1 year 1 year' I year Outcome 1 Outcome 1 Outcome? Outcome The possible outcomes displayed in Figure 1 are then compared for both TN and TP, and the combined outcomes are converted into designations of"green", "yellow" and "red" which correspond to an increasing need for concern (Figure 2). 3 Agenda item#5a Page 4 of 14 Figure 2. Management response matrix using outcomes for TN and TP. Total Phosphorus Total Nitrogen Outcome 0 Outcome 1 Outcome 2 Outcome 3 Outcome 0 Outcome 1 Outcome 2 Outcome 3 As a final step, the appropriate management response to water quality within a given year is then identified based on the results from Figure 2. For example, if water quality data suggest that TN and TP concentrations are elevated, then it is important to determine if the ecological health of Clam Bay appears to be adversely impacted by those nutrient concentrations. As a test of the impact of potential nutrient enrichment, water quality data would then be tested to determine if phytoplankton levels are perhaps higher, or dissolved oxygen levels lower, based on nutrient concentrations (Figure 3). Figure 3. Management response actions in response to various outcomes fareen Response Yella,z or Ked evaluation mold the Imo Evaluatephytoplankton 1 significant dissolved oxygen (p<0 Not significant response to nutrient +p-a. os) concentrations Evaluate water clarity Not significant response to chlorophyll-a (pr.o.OS) Significant(p<O.OS) Small difference or shot-*duration Identify potential causes and implement leic:r�tif,patr►tial recommended response Large difference or ciu,,esand long druation r- sporr`es In this manner, management responses are proportional to the frequency and duration of exceedance conditions, as well as the determination of whether or not nutrient supply appears to be causing adverse water quality conditions. With this information as background, the rest of this report will focus on the analysis of water quality data collected during the period of November 2016 to October 2017, at nine open water locations shown in Figure 4. In addition to the open water sample sites, a number of 4 Agenda item#5a Page 5 of 14 sampling locations were located in the stormwater treatment ponds east of the mangrove fringe on the east side of Outer, Inner and Upper Clam Bays (Figure 4). Figure 4. Locations of monthly monitoring stations sampled for Clam Bay and its directly adjacent watershed. , m. Y ♦ 'hS'.t s ffi�.. + fx ,. 4 a % �d �° ' t } Fd i* �.'' .per+ a. v .t+ s♦ 'd a ter .04 4 as t; atrr� #rf 45` e y' k �fK 'M4q �IiyrF#4.s `K. iY+ V5r4t fi } � '7i YM g 67.E1 to <a ��¢ �.��`'�•�f. ..yam '� ; ,� 'C IcTt• 44, { {?v> xttzaaoirAix rd • CLAW ■ 11 CLAM 71f3'1#14 SAYI CLAM SAY} ! a ' - 6kTt • + rc.II�1]4 -e'QQir ���Q®- bB ICa mow/ ®®®©�L'.� L1�G'®®6af':74� edig vM hs 1�4a vywdms CURRENT SAMPLE LOCATIONS c c�v.o®r�� `trs�ria r ww �waac Pic mamma l' • Data Analysis—Nutrient Status The analysis conducted below was used to assess the water quality status of Clam Bay during the months of November 2016 to October 2017. While the period of analysis was not from a single calendar year, it does encompass twelve consecutive months of data collection. A monitoring event was not performed in September 2017 due to the landfall of Hurricane Irma in Immokalee, Florida. In addition, a sample was not collected at station Clam Bay 1 in October 2017 due to debris blocking access to the monitoring site. Therefore, a total of 98 water quality samples were reported within Clam Bay for the analysis period. Water quality data from Clam Bay and its watershed were provided by Turrell, Hall and Associates, Inc. For comparison with the FDEP adopted SSAC for Clam Bay, as listed within FAC. 62-302-532, the water quality data set provided by Turrell, Hall and Associates was analyzed based on the following: 5 Agenda item#5a Page 6 of 14 "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 Upper Limits for TP and TN concentrations noted above are derived based on Equations 1 and 2, respectively: Equation 1: TP Upper Limit (mg/L)= e(-1.06256-0.0000328465•Conductivity(Ns)) Equation 2: TN Upper Limit (mg/L)= 2.3601 —0.0000268325*Conductivity(pS) The nutrient dataset examined 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. TN and TP concentrations were compared to the derived upper limit thresholds to quantify the presence or absence of elevated concentrations of TP and/or TN, with results listed in (Appendix A). Over the period analyzed (November 2016 to October 2017), a total of three (3) ambient water quality values for TN exceeded the respective TN Upper Limit, for an exceedance frequency of approximately 3 percent. In comparison, 33 of the 98 TP measurements (approximately 34 percent) exceeded their respective TP Upper Limit. Based on these results, the frequency of exceedance would not be high enough for the waters of Clam Bay to be determined to be impaired for TN, but those same waters would be determined to be impaired for TP. Table 1 displays the results in a manner intended to allow for a quick visualization or results by month and by station. Sampling locations and months are color coded as to the results, with green representing "passing" values, red representing "failing" values, and yellow representing values within the error rate (i.e., ± 5 percent) of threshold criteria. Table 1. Representation of frequency of impairment for TN and TP for different site and date combinations. Green represents sample clearly not out of compliance with criteria. Red represents a sample clearly out of compliance with criteria. Yellow represents a sample within the range of resolution of laboratory values (i.e., + 5 percent) and/or rounding errors. Clear cells represent a lack of data. Month 1 2 3 4 5 6 7 8 9 TN TP TN TP TN TP TN TP TN TP TN TP TN TP TN TP TN TP Nov-16 Dec-16 Jan-17 Feb-17 Mar-17 Apr-17 May-17 Jun-17 Jul-17 Aug-17 Sep-17 Oct-17 ' The overall pattern shown in Table 1 is that of reduced frequencies of exceedance of criteria for TN, compared to TP. As well, the months of November 2016 to January 2017 and then July to August 2017 6 Agenda item#5a Page 7 of 14 had relatively low rates of exceedance. The months of February to May had, on average, the highest rates of exceedance of nutrient criteria, usually for phosphorus. These results suggest that nutrient impairment may not be driven by stormwater runoff alone, as the months of February to May are typically some of the drier months in Southwest Florida. In contrast, the months of July and August of 2017 exhibited lower rates of exceedance, even though they typically represent times of maximal runoff of stormwater from the Clam Bay watershed. A possibility, worthy of further investigation, is whether or not the trend of elevated phosphorus concentrations might reflect seasonal changes in the abundance of wading birds, and in particular the nesting habits of wading birds. In a study titled "South Florida Wading Bird Report" it was noted that wood storks (Mycteria americana) typically initiate nesting in South Florida in the months of February to March (Cook 2016). Other species, such as White Ibis (Eudocimus albus) and herons within the genus Egretta nest somewhat later, up to April, but they extend their nesting behavior until May or June, if the wet season starts later in the year (Cook 2016). Thus, the abundance of wading birds, particularly nesting pairs and their offspring, may have an influence on water quality not only in Clam Bay, but in the nearby ponds that drain into Clam Bay. Bird guano has an exceptionally high phosphorus content, which could explain the apparent concurrence between those months with the greatest frequency of impairment for phosphorus (February to June) and those months where wading bird nesting in South Florida is at a seasonal high (February to May). Since the TP exceedances have occurred in two consecutive reporting periods, the outcome from the flowchart shown in Figure 1 would that of a score of"3"for TP, compared to a score of"0" for TN (Figure 2). With two years' worth of data, the combination of outcome "3" for TP and outcome "0" for TN would result in a "yellow" management response, as illustrated in Figure 3. Since the TP exceedance rate was greater than 15 percent, then the "yellow" management response would be the outcome for this first year's data collection effort. Consequently, the following additional data investigations were conducted: • Determining the relationship, if any, between TP and chlorophyll-a • Determining the relationship, if any, between TP and dissolved oxygen • Determining the relationship, if any, between chlorophyll-a and water clarity Depending upon the findings of the analyses listed above, management implications would be developed, which could include the need to determine the basis for a potential adverse impact on water quality. A review of the last 12 months of data indicated a direct relationship between TP and chlorophyll- concentrations (Figure 5) as well as an inverse relationship between TP and DO (Figure 6). As measurements of water clarity were not available for review, water clarity data was not included in the reviewed data sheets. Unfortunately, this did not allow for the determination of whether or not there was a correlation between chlorophyll-a concentrations and water clarity. As such, we were unable to evaluate the influence of chlorophyll-a on water clarity in Clam Bay. 7 Agenda item#5a Page 8 of 14 Figure 5. Relationship between total phosphorus and chlorophyll-a over the period of November 2016 to October 2017 in Clam Bay (p<0.0001). ° so- 60 0 o50- O J_ 3 40- r ° o 0 0 0 20 0 ° ° m ° °o ° 0 . . o o ° 0 p 00 0 O kO��D9 bo ° 0 0 0.05 0-10 0.15 020 025 Total Phosphorus img Figure 6. Relationship between total phosphorus and dissolved oxygen over the period of November 2015 to October 2016 in Clam Bay (p<0.001). ° 0 00 0 00 0 0 0 0 0 0 0 0 Cb 8 0 0 0 8-0 p 003 0 0 ° O U ° 0 0"•0 0 0 0 0 .O ° 000 0 ° 0 0 ° B 0 k 4_ 0 O ° 0 00 0 0 O ° 0 0 0 0 O 0 0 0 0 2- O 0 0 ° 0 0 0 0:05 010 0.15 030 0.25 Total Phosphorus(mg:Li In addition to the data assessments described above, data from Clam Bay outfall monitoring stations were compared to the proposed Downstream Protective Values (DPV) derived for Clam 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 found at those locations (Appendix B). The median DPV quantity represents a value that would be expected to be exceeded approximately 50 percent of the time, while the 90th percentile value represents a concentration sufficiently high that only 10 percent of values would be expected to be higher. Using this approach, the amount of TN or TP in the water 8 Agenda item#5a Page 9 of 14 column at stations sampled in the Clam Bay watershed can be compared to criteria that are meant to be protective of the open waters of Clam Bay. The TN and TP concentrations in DPV estimates are expected to be higher than concentrations in the open waters of Clam Bay, as the influence of the more saline and lower nutrient content waters of the Gulf of Mexico would not yet have diluted the higher nutrient concentrations found in freshwater inflows from the watershed. 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 0.10 and .25 mg/L, respectively. For data collected at the outfall monitoring sites, 53 and 17 percent of the TN concentrations exceeded the median and 90th percentile DPV values for TN, respectively (Table 2). For those same outfall monitoring sties, 83 and 32 percent of the TP concentrations exceeded the median and 90th percentile DPV values, respectively (Table 1). Table 2. Percentage of TN or TP concentrations from outfall stations which exceeded the median or 90th percentile DPV values. Total Nitrogen Total Phosphorus DPV Median 90th Percentile Median 90th Percentile Below 47 83 17 68 Exceed 53 17 83 32 Results—Nutrient Status Based on the data collected from this year's monitoring efforts, the waters of Clam Bay do not appear to be problematic in terms of nitrogen, but they do exceed regulatory criteria for phosphorous. The abundance of phosphorous positively correlates with chlorophyll-a concentrations in Clam Bay, which suggests that the availability of phosphorous influences the amount of phytoplankton in Clam Bay. Also, increased phosphorous concentrations are inversely correlated with levels of dissolved oxygen in Clam Bay. Data collected from the outfall monitoring stations suggest that nitrogen concentrations are somewhat elevated, but that most of the elevated concentrations of nitrogen are from the highest values recorded, rather than there being a "typical" condition of elevated nitrogen enrichment. For phosphorous, elevated concentrations are found both in typical conditions and also amongst the highest concentrations, compared to guidance criteria. These results strongly support the recommendation that the watershed and open waters of Clam Bay should continue to be monitored on a regular basis, as there is the possibility that phosphorous loads, in particular, could become problematic to the water quality and ecosystem health of Clam Bay, particularly if phosphorous concentrations were to increase over time. Additionally, as nutrient concentrations vary as a function of the balance between stormwater runoff and mixing with the waters of the Gulf of Mexico, the tidal prism for the Clam Bay system should be maintained such that it continues to allow for sufficient tidal exchange of the waters of Upper, Inner and Outer Clam Bay. Results—Dissolved Oxygen For levels of DO the applicable regulatory criterion, as outlined in FAC 62-302.533, is that minimum DO levels (for Class II waters like Clam Bay) shall not be lower than 42 percent saturation more than 10 9 Agenda item#5a Page 10 of 14 percent of the time (for average daily values) or that 7-day average values shall not be below 51 percent saturation more than once in any 12-week period, or that the 30-day average DO percent saturation shall not be below 56 percent more than once per year. The less-restrictive 7-day and 30-day criteria require DO measurements to be made over a 24 hour period, which is not applicable for comparison with water quality data collected at a single time of day, once a month. As such, the more restrictive criterion was used for Clam Bay, and DO values (in units of percent saturation) were compared against the 42 percent saturation value. Results are shown in Figure 7. Figure 7. Dissolved oxygen values (percent of 100 percent saturation) for nine stations in Clam Bay, over the period of November 2016 to October 2017. 0 a 0 0 ao a a 8 0 o 0 e o o a So8 o ° 0 0 0 0 0 0 o 0 0 o r. 0 o y 0 A 60 3 8 o a 0 0 0 ° 0 0 0 0 0 0 0 0 p 0 0 S Olaas 0 Standard 0 40- 0 0 20 e 0 0 0 0 Nov... Dec Jan Feb Mar Aur May Jun AA Aug Sec Oct Nov 2016 2017 Sampling Date Since DO values were collected at nine stations for eleven months (n = 98) it would take 10 values below 42 percent saturation for Clam Bay to be considered to be out of compliance with the DO criteria listed in FAC 62-302.533. Thirteen values show DO at lower than 42 percent saturation, the majority of which occurred during the months of July to October. Based on these results, the waters of Clam Bay would be considered to be out of compliance with existing DO criteria. Of the thirteen depressed values, five were reported at the Clam Bay 2 monitoring location, which is located in a narrow channel between Upper Clam Bay and Inner Clam Bay (Table 3). 10 Agenda item#5a Page 11 of 14 Table 3. Dissolved Oxygen Saturation values at sites Clam Bay 1 to 9, in units of%. Values highlighted in yellow are below the criteria for Class II waters (42%). Station 1 2 3 4 5 6 7 8 9 11/9/2016 65.9 69.1 92.5 84.0 94.1 93.5 79.0 84.7 77.9 12/6/2016 65.8 48.5 73.2 86.6 103.6 95.1 93.5 94.1 76.5 1/19/2017 61.9 33.3 72.4 102.5 98.4 97.4 101.6 79.5 71.9 2/23/2017 49.6 56.7 72.4 93.8 105.8 89.9 105.9 92.8 83.7 3/21/2017 59.6 60.9 102.1 91.1 100.1 99.6 80.2 81.3 72.4 4/18/2017 54.3 17.2 98.6 88.4 99.5 87.7 85.1 83.2 71.3 5/24/2017 69.9 57.1 80.1 85.8 103.0 86.0 69.6 7.6 59.3 6/21/2017 44.2 50.5 60.6 80.3 92.6 89.8 70.7 60.0 52.7 7/13/2017 47.9 20.5 42.7 41.0 56.0 46.0 63.1 21.1 41.1 8/14/2017 28.9 19.3 36.5 48.2 84.7 80.9 83.6 61.2 65.2 10/4/2017 - 0.4 29.3 33.0 76.6 69.5 59.9 53.1 50.2 Results - Copper For levels of copper, there are different criteria used for marine waters vs. freshwater systems such as stormwater ponds. For marine waters, the standard, as listed in FAC 62-302.530, is that concentrations are not to exceed 3.7 pg / liter. However, the State of Florida's Impaired Waters Rule (FAC 62-303) allows for a certain amount of"exceedances" to occur, before water quality is considered to be out of compliance. Table 4 summarizes the data collected from all stations, from November of 2016 to October of 2017, for Stations Clam Bay 1 to Clam Bay 9, all of which are located in the open waters of Upper, Inner or Outer Clam Bay. 11 Agenda item#5a Page 12 of 14 Table 4. Copper values at sites Clam Bay 1 to 9, in units of pg / liter. Values highlighted in yellow exceed copper criteria for Class II waters (3.7 pg Cu / liter). Station 1 2 3 4 5 6 7 8 9 11/9/2016 2.34 3.39 2.30 2.25 1.63 1.50 1.18 2.03 1.30 12/6/2016 2.33 2.93 5.10 2.45 2.39 1.78 1.27 1.88 1.72 1/19/2017 2.57 3.56 2.11 1.99 0.82 0.80 0.96 1.11 2.02 2/23/2017 2.51 3.35 1.60 1.12 0.85 0.85 1.50 2.57 2.60 3/21/2017 7.97 4.08 1.71 1.12 0.89 0.85 1.08 1.09 0.96 4/18/2017 6.48 8.16 1.62 1.24 0.80 0.96 1.28 1.01 1.10 5/24/2017 2.84 4.06 4.99 0.80 0.80 0.96 0.80 0.92 0.95 6/21/2017 3.84 4.24 3.85 0.91 1.20 1.14 1.26 1.11 0.76 7/13/2017 4.70 2.95 3.80 4.08 2.50 2.44 2.37 2.38 2.21 8/14/2017 4.29 3.81 3.22 2.65 1.40 1.22 1.47 1.02 0.70 10/4/2017 2.68 1.27 0.60 0.80 12.60 1.61 0.60 0.60 mean 3.99 3.93 2.87 1.75 1.28 2.28 1.34 1.43 1.36 median 3.34 3.56 2.3 1.24 0.894 1.14 1.27 1.11 1.1 N 10 11 11 11 11 11 11 11 11 #> 3.7 5 5 4 1 0 1 0 0 0 cyo > 3.7 50% 45% 36% 9% 0% 9% 0% 0% 0% Of the 98 samples collected for copper, 16 of them exceeded the established criteria of 3.7 pg /liter. Based on guidance in Table 3 of FAC 62-303, if a water body has between 97 and 104 samples collected, it would be determined to be out of compliance if 15 values exceeded established criteria. For Clam Bay, 16 of 98 samples collected in Upper, Inner and Outer Clam Bay exceeded FDEP's criterion for copper, which is sufficient for Clam Bay to be determined to be out of compliance for copper. Elevated copper concentrations were observed more frequently stations 1, 2 and 3, which are located in Upper Clam Bay down to Inner Clam Bay, and where the immediate shoreline is that of a natural mangrove fringe. It would be helpful to determine the reason(s) for elevated copper at these stations, as they are responsible for more than 90 percent of the exceedances of copper criteria in the entire Clam Bay system. The determination of copper exceedances in freshwater sampling sites in the watershed requires the simultaneous collection of data on "hardness". Unfortunately, most of the copper values from freshwater locations do not appear to have been accompanied by hardness values, so the degree of impairment cannot be fully investigated. However, 35 of the 61 samples from freshwater locations included results on hardness, and those data are analyzed below. The water quality standard for copper differs between predominately marine waters and freshwater. As classified by FDEP, open waters of Clam Bay have a water quality standard for copper of< 3.7 pg / 12 Agenda item#5a Page 13 of 14 liter. In contrast, the copper standard for freshwater is more complicated, as it requires the concurrent recording of a value for"hardness" in units of mg CaCO3 / liter. The toxicity of copper is mostly restricted to the abundance of the copper ion, and the greater the abundance of other dissolved compounds, the lower the probability that free copper ions will be available to bind with cell membranes, etc. and cause direct and indirect biological impacts. Briefly stated, the higher the hardness level of a water sample, the lower the probability that a given level of copper will be toxic. Once the level of hardness is determined, the copper criterion for a sample collected from freshwater is derived as: Copper standard (mg / liter) = e(0.8545[in1-1]-1.702) Where: e = the base of the natural logarithm (ca. 2.718281), and InH = natural log of hardness (in units of mg CaCO3/ liter) Thus, the determination of whether a sample meets or exceeds the water quality standards for copper only requires determination of the concentration of copper for marine samples; a concurrent value for hardness is required to determine compliance with freshwater criteria In the data set examined it appears that there were only 35 date and location combinations for freshwater stations where both hardness and copper levels were analyzed. Those stations and date combinations include the following: • The site "Glenview" on the dates of 2/28/2017, 5/22/2017, 6/22/2017, 7/12/2017, 8/15/2017 and 10/3/2017 • The site "PB-11" on the dates of 2/28/2017, 5/22/2017, 6/22/2017, 7/12/2017, 8/15/2017 and 10/3/2017 • The site "PB-13" on the dates of 6/22/2017, 7/12/2017, 8/15/2017 and 10/3/2017 • The site "N-Boardwalk" on the dates of 2/28/2017, 5/22/2017, 6/22/2017, 7/12/2017, 8/15/2017 and 10/3/2017 • The site "N-Berm" on the dates of 2/28/2017, 5/22/2017, 6/22/2017, 7/12/2017, 8/15/2017 and 10/3/2017 • The site "St. Lucie" on the dates of 5/22/2017, 6/22/2017, 7/12/2017, 8/15/2017 and 10/3/2017 • The site"N-41 PIPE" on the dates of 6/22/2017 and 7/12/2017 Copper concentrations at the sites Glenview, N-Berm, N-Boardwalk and St. Lucia exceeded the hardness-normalized copper criteria for Class III freshwater systems during at least one monitoring period. Typically, levels of copper were many times higher than impairment thresholds. These stations are located within the series of open water features on the west side of the Pelican Bay development, just east of the mangrove fringe that separates Clam Bay from its developed watershed. In contrast, none of the copper values from sites N-41, PIPI, PB-11, or PB-13 exceeded criteria for Class III freshwaters. Recommendations For the waters of Upper, Inner and Outer Clam Bay, water quality monitoring should continue at the same nine stations locations sampled in the reviewed data set. For determining compliance with nutrient criteria, chlorophyll-a should continue to be collected (and be corrected for phaeophytin) along with both Total Nitrogen and Total Phosphorous. To ensure results can be compared to NNC criteria 13 Agenda item#5a Page 14 of 14 established specifically for Clam Bay, values of specific conductance also need to be collected, as they were here. Future sampling should include measurements of water clarity for Clam Bay sites 1 through 9, through the use of a Secchi disk or through the direct measurement of light attenuation coefficients. If phosphorous concentrations continue to be elevated, a more detailed pollutant loading model should be developed, so that loading sources could be identified and appropriate management responses developed. This loading model should include the potential for wading bird populations to be a significant factor, since the overall temporal pattern appears to be that phosphorus concentrations correlate better with presumed populations of wading birds than with stormwater runoff. For copper, the sampling sites in Upper and Inner Clam Bay should be investigated in greater detail, as that these three stations (of 9 total stations) are responsible for more than 90 percent of copper impairments in the Clam Bay system. As well, measurements of copper in freshwater ponds need to have concurrent measurements of hardness, as impairment determination in freshwater samples requires the "normalization" of copper values to the level of hardness in the water. Based on the locations where copper and hardness values were both recorded, it appears that levels of copper are elevated (often to a considerable degree) in the open water features to the east of the mangrove fringe that separates the developed watershed of Clam Bay from the marine waters of Clam Bay. The source(s) of the copper in these ponds should be determined, as those sources could also be impacting the waters of Clam Bay itself, particularly in the wet season. 14 Agenda item#5b Page 1 0124 CLAM BAY SEDIMENT & SURFACE WATER COPPER ANALYSIS 1 JANUARY 2018 PREPARED FOR: PELICAN BAY SERVICES DIVISION 801 LAUREL OAK DRIVE, SUITE 302 NAPLES, FL 34108 PREPARED BY: TURRELL, HALL&ASSOCIATES, INC. 3584 EXCHANGE AVENUE NAPLES, FL 34104 { Agenda item#5b Page 2 of 24 1.0 Introduction Turrell, Hall, and Associates (THA) was tasked by the Pelican Bay Services Division (PBSD) to collect sediment and surface water samples from the Clam Bay estuary system for analysis of copper and phosphorus concentrations. The Clam Bay estuary system is located in Collier County west of the Pelican development, south of the Bay Colony development, and north of the Seagate and Naples Cay developments. The system is bound on the west by the Gulf of Mexico. 1.1 Background In October 2012, The Florida Department of Environmental Protection (FDEP) classified Clam Bay as "impaired for copper". Immediately, the PBSD started looking for potential sources of copper in the system and implementing changes within the Pelican Bay community to try and reduce copper concentrations from reaching the Clam Bay estuarine waters. In August 2013, PBSD stopped using copper based algaecides to treat algal growth in its stormwater lakes. Subsequent testing has shown that copper levels in these lakes are dropping, however, elevated copper levels are still a concern to the community. Between November 2016 and October 2017 water quality data were analyzed to determine the degree to which the waters of Upper, Inner and Outer Clam Bay are in compliance with relevant criteria. It was found that levels of phosphorous were out of compliance with existing site- specific criteria for Clam Bay. In an effort to collect additional data relative to phosphorus levels within the system, sediments collected were also analyzed for phosphorus concentrations. Traditionally, management of aquatic resources in Florida has focused primarily on surface water quality. However, sediments are also viewed as important because many substances that are found within the water column can accumulate to elevated levels in sediments. As such, sediments can serve as both a reservoir and as a potential source of contaminants to the water column once those reservoirs have reached or are approaching their capacity. Several mechanisms contribute to metal remobilization from contaminated sediment. First, sediment and associated contaminants may be re-suspended by agitation from storms, floods, runoff, and activities of bottom dwelling creatures. Second, changes in physicochemical conditions, such as pH or dissolved oxygen, can dissolve sediment bound trace metals and make them available to re-enter the water column 1.2 Purpose The purpose of this sampling effort is to provide data relative to the copper concentrations in both sediments and within the water column for comparison to past sampling efforts. Agenda item#5b Page 3 of 24 1.3 Scope of Analysis The sampling effort for this analysis included: o Collection of sediment and surface water samples from twelve locations scattered throughout the Clam Bay estuary system. (See Attached Exhibit) o Measurements of water depth and silt depth at each location o Analysis of samples by a Florida certified laboratory o Preparation of this written summary report outlining the findings. 2.0 Methodology Sediment and surface water samples were collected on January 29, 20181 by THA biologists. At each of the 12 sampling stations, data collection included; o A sediment grab sample to be tested for copper, aluminum, and total phosphorus o A water quality sample to be tested for copper and hardness, o A measurement of water depth, o A measurement of the silt depth, o Field measurements of Specific conductivity and temperature The water quality sample was taken from approximately 6 inches beneath the surface and collected into pre-labeled bottles from the lab. Sediment samples were collected following the surface water collection to safeguard against accidental contamination of the water column. Sediment samples were collected by pushing a soil collection probe into the bottom of the bay. Upon transfer to the surface, the top 2 inches of material was kept and transferred to the pre- labeled containers from the lab. Silt depth at the sample location was then assessed using a push pole marked with a measuring tape. All samples were kept on ice in coolers until transferred to the lab for analysis. Chain of custody forms were filled out and provided to the lab along with the samples. All samples were labeled to record sample location, date, and time. The attached Exhibit 2 shows the locations that sediment and surface water samples were taken. Lab analyses of the sediment and water quality samples was conducted by Benchmark EnviroAnalytical Inc. (NELAC Certification#E84167). 3.0 Results Benchmark performed the following procedures on the samples provided: Copper- sediments (EPA 6010) Aluminum—sediments (EPA 6010) Total P—sediments (365.3) Total Solids—sediments(SM2540G) Copper—surface water(SM3113BMIBK) Hardness—surface water(SM2340C) This sampling event was later than anticipated because of problems with the surface water sampling during the November sampling event. Agenda item#5b Page 4 of 24 Results of the analysis are summarized in the following tables and graphs. Copies of the laboratory results and chain of custody forms are provided in Appendix A of this Summary Report. Tables are provided for both sediment samples as well as water quality samples for ease of comparison. Table 1: Sediment Sampling Results January 2018 Sediment Parameters Total Total P Solids Silt 1 Sample Copper Aluminum (% Dry (% Dry depth Location (mg/kg) (mg/kg) wt) wt) (feet) CB 1 3.75 1484 0.042 51.9 1.87 CB 2 8.52 2849 0.076 54.6 0.82 CB 3 1.53 647 0.022 75.3 0.11 CB 4 1.18 403 0.021 73.4 0.04 CB 5 14.60 1913 0.039 56.3 0.34 CB 6 9.63 1148 0.018 59.6 0.22 CB 7 16.00 1348 0.014 65.0 0.35 CB 8 44.60 1017 0.065 27.6 0.08 CB 9 58.70 2110 0.052 41.4 0.35 CB 10 4.78 2297 0.042 61.2 0.83 CB 11 152 1876 0.028 34.8 1.87 CB 12 320 908 0.104 53.9 0.00 Table 2: Surface Water Sampling Results January 2018 Surface Water Parameters Water Hardness Sample Depth Copper (mg/1 Location (feet) (ug/1) CaCO3)) CB 1 2.13 1.07 6100 CB 2 3.68 1.23 6030 CB 3 3.82 1.17 5970 CB 4 4.90 1.38 6100 CB 5 2.90 1.87 5680 CB 6 2.90 2.46 5510 CB 7 3.15 3.34 5640 CB 8 3.01 3.16 4730 CB 9 3.55 2.60 4670 CB 10 3.20 3.93 4680 CB 11 4.95 4.42 3920 CB 12 6.27 26.3 129 Agenda item#5b Page 5 of 24 4.0 Discussion This study was conducted primarily to investigate the copper concentrations of the sediments within the Clam Bay Estuarine system. Various associated parameters were also evaluated, as described in Section 3.0, to allow for interpretation of the data and provide a little better overview of the system. 4.1 System Characteristics Eleven of the twelve sites sampled were marine waters within the estuary system. Site #12 was located within the stormwater management lake of the Vizcaya neighborhood of Bay Colony. Water depths ranged from 0 to 6 ft. within the estuary waters and 4 to 7 feet in the Vizcaya pond. Silt depths ranged from 1 to 22 inches at the different locations and do not seem to indicate any problems with excessive sedimentation. 4.2 Surface Water Sampling The DEP state standards for copper within regulated marine waters is 3.7 ug/l. The standard for regulated freshwater bodies (stormwater ponds are not regulated) is computed as a relationship with the hardness of the water. The acceptable limits for the specific metals vary based on the water hardness. In presenting this data,the water hardness level at Station#12 (Vizcaya pond)was used to calculate the limits for copper in relation to its specific hardness, expressed as Cu < e(0.8545[1nH]-1.702). Table 3: Comparison of Copper levels to State Standard State Compliant Compliant Hardness Standard with State with State Sample Copper (mg/l (ug/l) Standard Standard Location (ug/l) CaCO3)) 01/2018 04/2017 CB 1 1.07 6100 3.7 YES YES CB 2 1.23 6030 3.7 YES YES CB 3 1.17 5970 3.7 YES YES CB 4 1.38 6100 3.7 YES YES CB 5 1.87 5680 3.7 YES YES CB 6 2.46 5510 3.7 YES YES CB 7 3.34 5640 3.7 YES YES CB 8 3.16 4730 3.7 YES NO CB 9 2.60 4670 3.7 YES NO CB 10 3.93 4680 3.7 NO YES CB 11 4.42 3920 3.7 ihimitiiikNO jaiiiiiiiiiiNO CB 12 26.3 129 11.60 Two of the stations within the estuary waters showed copper levels higher than the State standards or natural regulated marine water bodies. This is slightly better than the three non-compliant stations from the previous testing effort. All of these stations are at the upper end of the Clam Bay system where flushing and water exchange is lowest. The values at locations #8 and 9 are better than from the previous testing and also better than the most recent monthly water quality sampling that has been done. The current sampling station#9 is in roughly the same location as the monthly Agenda item#5b Page 6 of 24 #1 sampling site. Copper levels in this area have bounced above and below the State Standards from about March of 2015. The last two readings from August and October were 4.29 and 2.68 respectively. The current reading of 2.60 is lower than these past results and has fallen back below the standard. Sampling Station #10 showed slightly elevated copper levels in the water above the previous testing results but the sediments from this site actually showed better than the previous sampling as seen below. As seen in the discussion below, elevated copper levels within the sediments are present and increase as we move further north in the system. High sediment copper levels main that they are more susceptible to copper going back into solution whenever sediments may be disturbed. Station #12 also had copper concentrations higher than the State standards for regulated fresh waters but it is important to remember that as a stormwater pond, this water body is not subject to these standards. The elevated copper concentrations in this lake may be an indication that there is too much copper present for the organics in the lake to bind into the sediments and therefore, the copper still in solution is more susceptible to passage through the water management system and into the waters of the estuary. This lake outfalls into the general area of station #11 which in turn passes through to Station #9 and #8. All three of these stations have shown copper levels above the State standards though Stations#8 and#9 were lower during this most recent effort. 4.3 Sediment Sampling The tool for interpreting copper concentrations in sediments in based on a demonstrated and scientifically backed, naturally occurring relationship between copper and aluminum. Aluminum has become the preferred reference element to normalize sediment copper concentrations because it is the most abundant naturally occurring metal, it is highly refractory, and its concentration is generally not influenced by anthropogenic sources. This approach to the interpretation copper and other metals data was initially described and adopted in 1986 "Geochemical and Statistical Approach for Assessing Metals Pollution in Estuarine Sediments" (FDERIOCM 1986a & b). In 2002 "Development of an Interpretive Tool for Assessment of Metal Enrichment in Florida Freshwater Sediment" was published and further refined the tool to be used within freshwater environments. This interpretive tool allows results of sediment chemical analyses to distinguish natural versus enriched copper concentrations in sediments as well as the degree of enrichment. Sediment samples are analyzed and metal concentrations are plotted against aluminum with regression lines and confidence limits clearly depicted. This information is capable of indicating copper concentrations at elevated levels and shows the distinction between natural and anthropogenic sources. The concentration is considered natural if the data point falls within the prediction limits. If a data point is plotted above the upper prediction limit, which 7 of the 12 samples are, then the sample is considered to be enriched. Also, the greater the distance above the prediction limit to a data point,the greater the degree of enrichment is identified. The trend in the samples noted during the April sampling event is still apparent following this most recent sampling. Namely, it appears that the further away from the Pass the sample site is located, the higher the relative concentrations of copper become. Agenda item#5b Page 7 of 24 Sediment Copper Samples as Normalized by Aluminum 1000 CB 12 CB11 0 100 CB CB8 • CO 7 5 Upper limit -E. 10 CB tr CB i O. CB 1 C,,B 10 i Regression Line CL Upper Limit a CB 3 1 CO 4 Bottom Limit Regression Line 0,1 Bottom Limit 0,01 10 100 1000 10000 Aluminum(ppm) The results for site #12 are also shown on this graph though the regression limits for freshwater systems are slightly different, the location is still above the threshold as well so is simply included on this graph for simplicity. The above analysis alone however, only shows the degree of enrichment, it is incapable of evaluating the potential hazards posed by sediment copper to aquatic organisms. Further tools are required to help determine if copper is present in the sediments at concentrations which could harm or impair the aquatic environment and associated biological processes. This approach has since been further refined and elaborated upon for the FDEP in numerous studies and documents using ever more stringent statistical standards. The documents include: "Approach to the Assessment of Sediment Quality in Florida Coastal Waters" (MacDonald, 1994 Volumes 1 & 2) and "Development and Evaluation of Numerical Sediment Quality Assessment Guidelines for Florida Inland Waters" (MacDonald & USGS 2003). These documents developed an additional interpretive tool to better assess the potential for biological effects associated with sediment concentrations in Coastal/Estuary waters called Sediment Quality Assessment Guidelines (SQAGs). These SQAGs define three distinct ranges of contaminant (copper) concentrations that are described as; a no effects or minimal effects range, a possible effects range (threshold effects level (TEL)), and a probable effects range (probable effects level (PEL)). The threshold effects level (TEL) represents the upper limit of the range of sediment contaminant concentrations within which biological effects are rarely or never observed (no effects or minimal effects range < TEL). Within this range, concentrations are not considered to represent significant hazards to aquatic organisms. Agenda item#5b Page 8 of 24 The probable effects level (PEL) defines the lower limit of the range of concentrations that are usually or always associated with adverse biological effects. The range of concentrations that could, potentially, be associated with biological effects (the possible effects range) is delineated by the values which fall between the TEL and the PEL. Within this range of concentrations, adverse biological effects are possible; however, it is difficult to predict the occurrence, nature, and/or severity of these effects. The numerical SQAGs for copper within estuary sediment are presented in MacDonald 1994, as a TEL of 18.7 mg/kg and a PEL of 108 mg/kg and they are offered with a moderate degree of confidence according to the author. Eight of the eleven marine sampling sites had sediment copper levels below the 18.7 TEL threshold. Two of the sites had levels between the TEL and PEL thresholds which means that adverse biological effects are possible. The final marine site (#11)had a level above the PEL threshold (though much lower than the 1017 mg/kg recorded in April). This means that adverse biological effects would be expected within this area. It is not clear what those effects might be though less fish and invertebrate presence would be an indicator. No information was present at the time of this report to say whether any adverse effects were realized. 5.0 Comments It is likely that the elevated sediment copper levels within the Clam Bay estuarine system are human induced. Restricted flows and limited flushing of the upper reaches of Clam Bay's mangroves and bays coupled with a continued influx of copper from the stormwater system inputs have led to higher concentrations of copper in the estuarine system and potential adverse impacts to fish, invertebrates,plants, etc. Without the flushing activity as is seen in Outer Clam Bay and the Pass, any copper within the water column is likely to remain in the system. When bound to organic matter in the sediments, it is still susceptible to re-dissolving into the water column when those sediments are disturbed(such as through wind, storms, boat wakes, etc.). The copper in the upper reaches of the Bay could be in a repeating loop of solution to sediment to solution because there is inadequate turnover of the waters to help removed it from the system. Under this scenario, it is possible that copper levels could continue to increase within the upper reaches of the system as long as additional copper is coming into the system via the stormwater outfalls of the surrounding developments. It is likely that even complete flushing of the water within the system and elimination of copper bearing water from the development would still not remove the copper issue because the copper within the sediments will equalize through dissolution back into the water column. Levels may decrease over time but it will likely take a long time for any decrease to become noticeable. This brief study of the Clam Bay sediments and the interpretation of those results is derived from a short term sampling exercise using two non-replicated sampling events. No definitive statements of long term trend or future conditions can be made without further monitoring or study. Agenda item#5b Page 9 of 24 E XHIBIT 1 SAMPLING LOCATION MAP j • .t,�t5 s . 0. 01.4 ? :xi 0 500 1,000 z E�$r >Ak ` UPPER .,. ', �` 4,i t:::47,,,....,-"*:,,,,..:?--..,z„,- 4:„.,„.-""?‘,:.,. ..,,,?i,,,,,,;..,_-,....-,,,-- ;ttt,:�` 7. 4 F'y :: 1 3 t CLAM pry :. �` A E' ' a �f f. '� �: BAY at;.� �:". .. +,,, ` ' `, • aj r TA"y s 4 iaKWi� § w, y {yp { 41 4:46'3144* : t'Ll''' ,.4,- . e,,,e"*,‘„'44-'4. , ' 1,1 '\,,,,t,17: k id 1 Ili. ,,.,.,..:,,,,,,,i.',,,!:, � d � `* � INNER •� ''''..r‘::,,, N,.`,:'!-.,,.0,?.. :4. t--$,.- , � - CLAM BAY ,.rt,:hrt i ,'„' 11/444' t ,t�`' { +� aga"' ...0 ai . ,:t.,.....- • t S ly ♦ 6 wk :� '§.sem' a w ;§r'. a 6 i _!.,:i t '� �s =, ' , tir,„:_, sr c� i • ., • '5I �i. 4 k j '. CLAMP'` \Nt .. k. F . , . .. , - ,„ : y b� � y� 4.-..4., ,L � g It 1- 11101 d F # t 7 t,,.+ t + F $ f . Legend O COPPER SEDIMENT SAMPLE LOCATIONS `%},' ��" � CLAM PASS PARK ;rr Q ist ID LATITUDE LONGTIUDE ` .1* "+ 1 26.21094548380 -81.81350572420 �, " in26.21332467840 81.81443380000 r•4,{ , +wr 26.21588687110 -81.81414079460 0rff, ,a 26.22153483430 81.81547426180 ,� y.-4�y 5 26.22897253880 81.81720317100 ` OUTER -- - i 6 26.23113257190 81.81608807110 CLAM ,--%,,7,0,44:,,,--..r ii '-' 7 26.23488094510 -81.81609601100 BAY 0 ' . , > �Y .? 8 26.24071519880 81.81646490170 • •t' z }-- :-.;''',.:.4.111.111.?926.24370495480 -81.81688687440 � ,,a l!# .. 10 26.24683965680 -81.81783859740 ~ ' a 11 26.24323406610 -81.81465786600 �: :y '`Y r. , 12 26.24512216250 81.81395681340 ant. ' � -� Turrell,Hall&Associates Inc. 06,-..,z,„ " 151 �E , CLAM BAY rEn. > E: Marine&Environmental(onsu%ing rori� - a,-z.s��e.5�re>Fc 5, ,.,- COPPER SEDIMENT SAMPLE LOC SHEET. �a Pn,il'.mu�nme�' -'5 x.nm Nwn::t'5-°-0I"5 Fse.�T9)N'.6G,_ SECTION- 190 ECTION- TOWNSHIP- RANGE- Agenda item#5b Page 11 of 24 A PPENDIX BENCHMARK SEDIMENT LAB REPORT & CHAIN OF CUSTODY 1 Agenda - #5b BENCHMARK Pap . .- EnviroAnaly ticalInc. III NELAC Certification 4E84167 ANALYTICAL TEST REPORT THESE RESULTS MEET NELAC STANDARDS Submission Number : 18011145 Turrell, Hall &Asso., Inc, Project Name : CLAM BAY SEMI-ANNUAL SEDIMENT 3584 Exchange Avenue, Suite B Date Received : 01/31/2018 Naples,FL 34104-3732 . Time Received : 1355 Submission Number: 18011145 Sample Date: 01/29/2018 Sample Number: 001 Sample Time: 1403 Sample Description: Sample 1 Sample Method: Grab Parameter Result Units MDL Procedure Analysis Analyst Date/Time TOTAL PHOSPHORUS AS P 0.042 %DRY WT 0.0015 365.3 02/02/2018 13:04 CE ALUMINUM 1484 MG/KG 0.341 6010 02/02/2018 13:38 KP COPPER 3.75 MG/KG 0.059 6010 02/02/2018 13:38 KP TOTAL SOLIDS 51.9 %DRY WT 0.1 SM2540G 02/01/2018 14:00 JW All values reported in UG/KG, MG/KG#/GRAM and MPN/GRAM are on a dry weight basis Submission Number: 18011145 Sample Date: 01/29/2018 Sample Number: 002 Sample Time: 1358 Sample Description: Sample 2 Sample Method: Grab • Parameter Result Units MDL Procedure Analysis Analyst Date/Time TOTAL PHOSPHORUS AS P 0.076 %DRY WT 0.0015 365.3 02/02/2018 13:05 CE ALUMINUM 2849 MG/KG 1.71 6010 02/02/2018 13:42 KP COPPER 8.52 MG/KG 0.298 6010 02/02/2018 13:42 KP TOTAL SOLIDS 54.6 %DRY WT 0.1 SM2540G 02/01/2018 14:00 JW All values reported in UG/KG,MG/KG#/GRAM and MPN/GRAM are on a dry weight basis Submission Number: 18011145 Sample Date: 01/29/2018 Sample Number: 003 Sample Time: 1352 Sample Description: Sample 3 Sample Method: Grab Parameter Result Units MDL Procedure Analysis Analyst Date/Time - TOTAL PHOSPHORUS ASP 0.022 %DRY WT 0.0011 365.3 02/02/2018 13:06 CE ALUMINUM 647 MG/KG 0.873 6010 02/02/2018 13:47 KP COPPER 1.53 MG/KG 0.152 6010 02/02/2018 13:47 KP 18011145 1711 12th Street East*Palmetto,FL 34221 *Phone(941)723-9986*Fax(941)723-6061 PAGE 1 OF 6 Agenda - #5b BENCHMARK Pag= . -- EnviroAnaly ticalInc. , 111 NELAC Certification 4E84167 TOTAL SOLIDS 75.3 %DRY WT 0.1 SM2540G 02/01/2018 14:00 JW All values reported in UG/KG,MG/KG#/GRAM and MPN/GRAM are on a dry weight basis Submission Number: 18011145 Sample Date: 01/29/2018 Sample Number: 004 Sample Time: 1337 Sample Description: Sample 4 Sample Method: Grab Parameter Result Units MDL Procedure Analysis Analyst Date/Time TOTAL PHOSPHORUS AS P 0.021 %DRY WT 0.0011 365.3 02/02/2018 13:07 CE ALUMINUM 403 MG/KG 1.09 6010 02/02/2018 14:18 KP COPPER 1.18 MG/KG 0.189 6010 02/02/2018 14:18 KP TOTAL SOLIDS 73.4 %DRY WT 0.1 SM2540G 02/01/2018 14:00 JW All values reported in UG/KG,MG/KG#/GRAM and MPN/GRAM are on a dry weight basis Submission Number: 18011145 Sample Date: 01/29/2018 Sample Number: 005 Sample Time: 1224 Sample Description: Sample 5 Sample Method: Grab Parameter Result Units MDL Procedure Analysis Analyst Date/Time TOTAL PHOSPHORUS ASP 0.039 %DRY WT 0.0014 365.3 02/02/2018 13:08 CE ALUMINUM 1913 MG/KG 1.16 6010 02/02/2018 14:21 KP COPPER 14.6 MG/KG 0.202 6010 02/02/2018 14:21 KP TOTAL SOLIDS 56.3 %DRY WT 0.1 SM2540G 02/01/2018 14:00 JW All values reported in UG/KG,MG/KG#/GRAM and MPN/GRAM are on a dry weight basis Submission Number: 18011145 Sample Date: 01/29/2018 Sample Number: 006 Sample Time: 1317 Sample Description: Sample 6 Sample Method: Grab Parameter Result Units MDL Procedure Analysis Analyst Date/Time TOTAL PHOSPHORUS ASP 0.018 %DRY WT 0.0013 365.3 02/02/2018 13:09 CE ALUMINUM 1148 MG/KG 1.35 6010 02/02/2018 14:24 KP COPPER 9.63 MG/KG 0.235 6010 02/02/2018 14:24 KP TOTAL SOLIDS 59.6 %DRY WT 0.1 SM2540G 02/01/2018 14:00 JW All values reported in UG/KG,MG/KG#/GRAM and MPN/GRAM are on a dry weight basis 18011145 1711 12th Street East*Palmetto,FL 34221 *Phone(941)723-9986*Fax(941)723-6061 PAGE 2 OF 6 Agenda - #5b BENCHMARK Pap • .- EnviroAnaly ticalInc. Mll NELAC Certification#E84167 Submission Number: 18011145 Sample Date: 01/29/2018 Sample Number: 007 Sample Time: 1309 Sample Description: Sample 7 Sample Method: Grab Parameter Result Units MDL Procedure Analysis Analyst Date/Time TOTAL PHOSPHORUS AS P 0.014 %DRY WT 0.0012 365.3 02/05/2018 12:58 CE ALUMINUM 1348 MG/KG 1.21 6010 02/02/2018 14:28 KP COPPER 16.0 MG/KG 0.211 6010 02/02/2018 14:28 KP TOTAL SOLIDS 65.0 %DRY WT 0.1 SM2540G 02/01/2018 14:00 JW All values reported in UG/KG,MG/KG#/GRAM and MPN/GRAM are on a dry weight basis Submission Number: 18011145 Sample Date: 01/29/2018 Sample Number: 008 Sample Time: 1256 Sample Description: Sample 8 Sample Method: Grab Parameter Result Units MDL Procedure Analysis Analyst Date/Time TOTAL PHOSPHORUS ASP 0.065 %DRY WT 0.0029 365.3 02/05/2018 12:59 CE ALUMINUM 1017 MG/KG 0.441 6010 02/02/2018 14:31 KP COPPER 44.6 MG/KG 0.077 6010 02/02/2018 14:31 KP TOTAL SOLIDS 27.6 %DRY WT 0.1 SM2540G 02/01/2018 14:00 JW All values reported in UG/KG,MG/KG#IGRAM and MPN/GRAM are on a dry weight basis Submission Number: 18011145 Sample Date: 01/29/2018 Sample Number: 009 Sample Time: 1252 Sample Description: Sample 9 Sample Method: Grab Parameter Result Units MDL Procedure Analysis Analyst Date/Time TOTAL PHOSPHORUS ASP 0.052 %DRY WT 0.0019 365.3 02/05/2018 13:00 CE ALUMINUM 2110 . MG/KG 1.83 6010 02/02/2018 14:34 KP COPPER 58.7 MG/KG 0.318 6010 02/02/2018 14:34 KP TOTAL SOLIDS 41.4 %DRY WT 0.1 SM2540G 02/01/2018 14:00 JW All values reported in UG/KG,MG/KG#/GRAM and MPN/GRAM are on a dry weight basis Submission Number: 18011145 Sample Date: 01/29/2018 Sample Number: 010 Sample Time: 1215 Sample Description: Sample 10 Sample Method: Grab Parameter Result Units MDL Procedure Analysis Analyst Date/Time TOTAL PHOSPHORUS AS P 0.042 %DRY WT 0.0013 365.3 02/05/2018 13:01 CE ALUMINUM 2297 MG/KG 1.58 6010 02/02/2018 14:38 KP 16011145 1711 12th Street East*Palmetto,FL 34221*Phone(941)723-9986*Fax(941)723-6061 PAGE 3 OF 6 Agenda - #5b BENCHMARK Pag_ , EnviroAnalytical Inc. . NELAC Certification#E84167 COPPER 4.78 MG/KG 0.275 6010 02/02/2018 14:38 KP TOTAL SOLIDS 61.2 %DRY WT 0.1 SM2540G 02/01/2018 14:00 JW All values reported in UG/KG,MG/KG#/GRAM and MPN/GRAM are on a dry weight basis Submission Number: 18011145 Sample Date: 01/29/2018 Sample Number: 011 Sample Time: 1237 Sample Description: Sample 11 Sample Method: Grab Parameter Result Units MDL Procedure Analysis Analyst Date/Time TOTAL PHOSPHORUS ASP 0.028 %DRY WT 0.0023 365.3 02/05/2018 13:02 CE ALUMINUM 1876 MG/KG 2.21 6010 02/02/2018 14:41 KP COPPER 152 MG/KG 0.383 6010 02/02/2018 14:41 KP TOTAL SOLIDS 34.8 %DRY WT 0.1 SM2540G 02/01/2018 14:00 JW All values reported in UG/KG,MG/KG#/GRAM and MPN/GRAM are on a dry weight basis Submission Number: 18011145 Sample Date: 01/29/2018 Sample Number: 012 Sample Time: 1439 Sample Description: Sample 12 Sample Method: Grab Parameter Result Units MDL Procedure Analysis Analyst Date/Time TOTAL PHOSPHORUS ASP 0.104 %DRY WT 0.0015 365.3 02/05/2018 13:34 CE ALUMINUM 908 MG/KG 1.77 6010 02/02/2018 14:45 KP COPPER 320 MG/KG 0.307 6010 02/02/2018 14:45 KP TOTAL SOLIDS 53.9 %DRY WT 0.1 SM2540G 02/01/2018 14:00 JW All values reported in UG/KG,MG/KG#/GRAM and MPN/GRAM are on a dry weight basis - 18011145 1711 12th Street East*Palmetto,FL 34221 *Phone(941)723-9986*Fax(941)723-6061 PAGE 4 OF 6 Agenda`em 5b BENCHMARK Page EnviroAnalytical Y NELAC Certification#E84167 02/06/2018 Dale Dixon/1J boratory Director Date Tiilay Tanrisever/QC Officer DATA QUALIFIERS THAT MAY APPLY: NOTES: i=Reported value is between the laboratory MDL and the PQL. PQL=4xMDL. J2=Estimated value.No control criteria exists for this component. X=Value exceeds MCL. J3=Estimated value.Quality control criteria for precision or accuracy not met. 2:SOUR calculations are based on Total Solids. J4=Estimated value.Sample matrix interference suspected. J2:Per client request,analysis conducted without method blank, L=Off-scale high.Value is known to be>the value reported. Q=Sample held beyond accepted hold time. U=Analyte analyzed but not detected at the value indicated. V=Analyte detected in sample and method blank. Y=Analysis performed on an improperly preserved sample.Data may be inaccurate. Z=Too many colonies were present(TNTC).The numeric value represents the filtration volume. For questions and comments regarding these results,please contact us at(941)723-9986. Results relate only to the samples. 18011145 1711 12th Street East*Palmetto,FL 34221 *Phone(941)723-9986*Fax(941)723-6061 PAGE 5 OF 6 Agenda item#5b a a 0 Paiel7 0124 , a. s................-, ( • 1 II ct N--i-- v, „....a.f.-- )„) ,...., ........ --- ..... , _.„.„. r3. .., . ..,,,z•-, r,,,,r).., ip, aliN . . i- v „ ... 11 99x9 ;"' EgRvRil 8 k s:C. _ 4 -(0) CA in Vn cil 4 V) V) {flVI 01 0 i.... f. f•-• 1- 1- 1-. 1- F 1- 1-- 1-- 1-- E W4 ce 1 ,...., 'I' • .r.'.°-‘ a co as- assa -- $. ql a '---- 'a '- 2 •$. 2S222212 :. • .3 ci e .? tg - - to • --,,,, ., czo = = = = = = c ,pz _ V 4, u en c•-1 - i..--„, 4., = i " cki .;'•C '',' 1 ,-:;"2. e. 7 ‘ r.• 41- ' -1 ' 4 --- an a „, I — _ 1- - 0 ?A es A E 4t 'y 1--* srt Z r4 1: 0 li = .ecE ,.gacccsg. g la a -a T9 i.e. E a 3 3 li w .0 I .0 fi m . 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TX C V 'rr 11 1,,• 4 ii 1$r• 1 CA ...., 1;ill ''' 43 to trt ‘.0 ..•••$ Li (B ,,c..A41, rl& A ,44 00 4.4 ON Co g III) 1,E , i c-1 . 1 I/ 2111 '1 i Ii N I s it . iiri 0 ,Z1* ‘0" I., ^ i,,34 - jeg enlv- Page 6 of 6 i Agenda item#5b Page 18 of 24 APPENDIX BENCHMARK WATER QUALITY LAB REPORT & CHAIN OF CUSTODY Agenda: -•- •5b Page 9.f 24 BENCHMARK EnviroAnalytical :11.v � NELAC Certification/1E84167 ANALYTICAL TEST REPORT THESE RESULTS MEET NELAC STANDARDS Submission Number : 18011146 Turrell, Hall &Asso., Inc. Project Name : CLAM BAY SEMI-ANNUAL SW 3584 Exchange Avenue, Suite B Date Received : 01/31/2018 Naples, FL 34104-3732 Time Received : 1355 Submission Number: 18011146 Sample Date: 01/29/2018 Sample Number: 001 Sample Time: 1401 Sample Description: Sample 1 Sample Method: Grab Parameter Result Units MDL PQL Procedure Analysis Analyst Date/Time TOTAL HARDNESS(CAC03) 6100 MG/L 0.682 2.728 SM2340C 02/03/2018 14:33 OT COPPER 1.071 UG/L 0.272 1.088 SM3113BMIBK 02/07/2018 12:48 KP Submission Number: 18011146 Sample Date: 01/29/2018 Sample Number: 002 Sample Time: 1356 Sample Description: Sample 2 Sample Method: Grab Parameter Result Units MDL PQL Procedure Analysis Analyst Date/Time TOTAL HARDNESS(CAC03) 6030 MG/L 0.682 2.728 SM2340C 02/03/2018 14:33 OT COPPER 1.23 UG/L 0.272 1.088 SM3113BMIBK 02/07/2018 12:53 KP Submission Number: 18011146 Sample Date: 01/29/2018 Sample Number: 003 Sample Time: 1350 Sample Description: Sample 3 Sample Method: Grab Parameter Result Units MDL PQL Procedure Analysis Analyst Date/Time TOTAL HARDNESS(CAC03) 5970 MG/L 0.682 2.728 SM2340C 02/03/2018 14:33 OT COPPER 1.17 UG/L 0.272 1.088 SM3113BMIBK 02/07/2018 12:57 KP Submission Number: 18011146 Sample Date: 01/29/2018 Sample Number: 004 Sample Time: 1335 Sample Description: Sample 4 Sample Method: Grab Parameter Result Units MDL PQL Procedure Analysis Analyst Date/Time 18011146 1711 12th Street East*Palmetto,FL 34221 *Phone(941)723-9986*Fax(941)723-6061 PAGE 1 OF 6 Agenda item#5b Page'0 if 24 BENCHMARK Ilii EnviroAnalytical Inc. , NELAC Certification#E84167 TOTAL HARDNESS(CAC03) 6100 MG/L 0.682 2.728 SM2340C 02/03/2018 14:33 OT COPPER 1.38 UG/L 0.272 1.088 SM3113BMIBK 02/07/2018 13:02 KP Submission Number: 18011146 Sample Date: 01/29/2018 Sample Number: 005 Sample Time: 1323 Sample Description: Sample 5 Sample Method: Grab Parameter Result Units MDL PQL Procedure Analysis Analyst Date/Time TOTAL HARDNESS(CAC03) 5680 MG/L 0.682 2.728 SM2340C 02/03/2018 14:33 OT COPPER 1.87 UG/L 0.272 1.088 SM3113BMIBK 02/07/2018 13:07 KP Submission Number: 18011146 Sample Date: 01/29/2018 Sample Number: 006 Sample Time: 1316 Sample Description: Sample 6 Sample Method: Grab Parameter Result Units MDL PQL Procedure Analysis Analyst Date/Time TOTAL HARDNESS(CAC03) 5510 MG/L 0.682 2.728 SM2340C 02/03/2018 14:33 OT COPPER 2.46 UG/L 0.272 1.088 SM3113BMIBK 02/07/2018 13:11 KP Submission Number: 18011146 Sample Date: 01/29/2018 Sample Number: 007 Sample Time: 1308 Sample Description: Sample 7 Sample Method: Grab Parameter Result Units MDL PQL Procedure Analysis Analyst Date/Time TOTAL HARDNESS(CAC03) 5640 MG/L 0.682 2.728 SM2340C 02/03/2018 14:33 OT COPPER 3.34 UG/L 0.272 1.088 SM3113BMIBK 02/07/2018 13:16 KP Submission Number: 18011146 Sample Date: 01/29/2018 Sample Number: 008 Sample Time: 1255 Sample Description: Sample 8 Sample Method: Grab Parameter Result Units MDL PQL Procedure Analysis Analyst Date/Time TOTAL HARDNESS(CAC03) 4730 MG/L 0.682 2.728 SM2340C 02/03/2018 14:33 OT COPPER 3.16 UG/L 0,272 1.088 SM3113BMIBK 02/07/2018 13:34 KP Submission Number: 18011146 Sample Date: 01/29/2018 Sample Number: 009 Sample Time: 1249 Sample Description: Sample 9 Sample Method: Grab Parameter Result Units MDL PQL Procedure Analysis Analyst Date/Time 18011146 1711 12th Street East*Palmetto,FL 34221 *Phone(941)723-9986*Fax(941)723-6061 PAGE 2 OF 6 Agenda'-ii '5b Page 1 of 24 BENCHMARK EnviroAnalytical Inc. ' NELAC Certification#E84167 TOTAL HARDNESS(CACO3) 4670 MG/L 0.682 2.728 SM2340C 02/03/2018 14:33 OT COPPER 2.60 UG/L 0.272 1.088 SM3113BMIBK 02/07/2018 13:39 KP Submission Number: 18011146 Sample Date: 01/29/2018 Sample Number: 010 Sample Time: 1212 Sample Description: Sample 10 Sample Method: Grab Parameter Result Units MDL PQL Procedure Analysis Analyst Date/Time TOTAL HARDNESS(CACO3) 4680 MG/L 0.682 2.728 SM2340C 02/03/2018 14:33 OT COPPER 3.93 UG/L 0,272 1.088 SM3113BMIBK 02/07/2018 13:44 KP Submission Number: 18011146 Sample Date: 01/29/2018 Sample Number: 011 Sample Time: 1235 Sample Description: Sample 11 Sample Method: Grab Parameter Result Units MDL PQL Procedure Analysis Analyst Date/Time TOTAL HARDNESS(CACO3) 3920 MG/L • 0.682 2.728 SM2340C 02/03/2018 14:33 OT COPPER 4.42 UG/L 0.272 1.088 SM3113BMIBK 02/07/2018 13:49 KP Submission Number: 18011146 Sample Date: 01/29/2018 Sample Number: 012 Sample Time: 1438 Sample Description: Sample 12 Sample Method: Grab Parameter Result Units MDL PQL Procedure Analysis Analyst Date/Time TOTAL HARDNESS(CACO3) 129 MG/L 0.682 2.728 SM2340C 02/0312018 14:33 OT COPPER 26.3 UG/L 0.346 1.384 SM3113B 02/09/2018 11:06 KP 19011146 1711 12th Street East*Palmetto,FL 34221 *Phone(941)723-9986*Fax(941)723-6061 PAGE 3 OF 6 Agenda .. •5b Page' .f24 BENCHMARK EnviroAnal tical Inc. . y 1 NELAC Certification#E84167 //411. ei de 02/09/2018 • Dale D. iixon/, aborttory Director Date May Tanrisever/ ' •:el Graves-QC Officers DATA QUALIFIERS THAT MAY APPLY: A=Value reported is an average of two or more determinations. Q=Sample held beyond accepted hold time. B=Results based upon colony counts outside the ideal range. T=Value reported is<MDL.Reported for informational purposes only and shall not be used H=Value based on field kit determination.Results may not be accurate. in statistical analysis. I=Reported value is between the laboratory MDL and the POL. U=Analyte analyzed but not detected at the value indicated. J1=Estimated value.Surrogate recovery limits exceeded. V=Analyte detected in sample and method blank.Results for this analyte in associated J2=Estimated value.No quality control criteria exists for component. samples may be biased high.Standard,Duplicate and Spike values are within control limits. J3=Estimated value.Quality control criteria for precision or accuracy not met. Reported data are usable. J4=Estimated value.Sample matrix interference suspected. Y=Analysis performed on an improperly preserved sample.Data may be inaccurate. J5=Estimated value.Data questionable due to improper lab or field protocols. Z=Too many colonies were present(TNTC).The numeric value represents the filtration volume. K=Off-scale low.Value is known to be<the value reported. !=Data deviate from historically established concentration ranges. L=Off-scale high.Value is known to be>the value reported. ?=Data rejected and should not be used.Some or all of QC data were outside criteria,and N=Presumptive evidence of presence of material. the presence or absence of the analyte cannot be determined from the data. 0=Sampled,but analysis lost or not performed. '=Not reported due to interference. Oil 8,Grease-If client does not send sufficient sample quantity for spike evaluation surface NOTES: water samples are supplied by the laboratory. MBAS calculated as LAS;molecular weight=340. COMMENTS: PQL=4xMDL. ND=Not detected at or above the adjusted reporting limit. X=Value exceeds MCL. Gt=Accuracy standard does not meet method control limits,but does meet lab control limits that are in agreement with USEPA generated data.USEPA letter available upon request. • For questions or comments regarding these results,please contact us at(941)723-9986. Results relate only fo the samples. • 18011148 1711 12th Street East*Palmetto,FL 34221 *Phone(941)723-9986*Fax(941)723-6061 PAGE 4 OF 6 g•- J II , ......., ,....., ., T. 'ger:::::-.), .... . . •4,,,a,.eo..12:.1 lc I f,...„:„.,,,,,,,: = ,,,,,,,, • ',',".> Zii. \•...):2 ' M.., ....„„ ‘,.... sr, poc cia 1 5 c4 i 9i 8 iThk, . -. . — s V E • 4 <> .4.— u...: ,E ..... 40 g E • •• • • • • • • V o T3-- M •- , '...••C 5 S. ..s. C.1, L'"' • ... 41; g Allo 1 b 1 * 2 1 en Z r v 1-• It 4: '. ,.. 2 • • • . ....„— tv) -ef..._1 r, .,t-1. vo ri..),, ri cii cl. I — . - - , , 1 - • - _g „..... . -1 1 . 0, ,., ,..._ ......_ — ......,..r— ....... . , .._ . g I 2 . A.... i , oct _.,,, v„,3 i . 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Q "Ei s < 1 I ,... , .. ,... .., ti §,--E , 3 3 3 ,, 3 3 3 . . f g i el 41 4 tr,.5 ,,,2 ,4 s..‘,3 il a v -3 ...= 0 I Ii i .. ... ._ .. 7, g it 1 gi 411 - 2[7?-11 b 'I a, .. , .., I. . < 19iii ilif i . . - 0 tX i it: NI 1 ....o I I' ir 7:7 to 1 i ii " !ail 2.,,,s f, to co 111:01 g4 t .4.4411 11 2 , To LI -11.f i e ......- °N.„,, a •• g ill', :II t i 4 El2 'ilims '' CIIIII. w 12. ;'' Z (71 iiili •Ga,46e=t =V=b41)i ,reu*_4*y*-)* 8>5-. 140111 2fin', 1 ' i 4 4 40 4) r.N e- C iiii 1 i 11 ilio R 7i vs- .tt ,„c vorl. 1 t, 2 .I Agenda item#5c Page 1 of 1 Clam Bay Copper ug/L Collection Date CB1 CB2 CB3 CB4 CB5 CB6 CB7 CB8 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 9/20/2016 1.690 2.280 1.280 1.760 0.751 0.700 0.700 1.030 0.700 11/22/2016 10/12/2016 2.760 2.200 2.130 1.190 2.900 1.860 1.060 0.954 1.310 12/7/2016 11/9/2016 2.340 3.390 2.300 2.250 1.630 1.500 1.180 2.030 1.300 1/16/2017 12/6/2016 2.330 2.930 5.100 2.450 2.390 1.780 1.270 1.880 1.720 3/14/2017 1/19/2017 2.570 3.560 2.110 1.990 0.818 0.800 0.961 1.110 2.020 4/4/2017 2/23/2017 2.510 3.350 1.600 1.120 0.851 0.848 1.500 2.570 2.600 4/24/2017 3/21/2017 7.970 4.080 1.710 1.120 0.894 0.846 1.080 1.090 0.957 6/1/2017 4/18/2017 6.480 8.160 1.620 1.240 0.800 0.956 1.280 1.010 1.100 6/14/2017 5/24/2017 2.840 4.060 4.990 0.800 0.800 0.959 0.800 0.920 0.946 7/6/2017 6/21/2017 3.840 4.240 3.850 0.906 1.200 1.140 1.260 1.110 0.760 8/8/2017 7/13/2017 4.700 2.950 3.800 4.080 2.500 2.440 2.370 2.380 2.210 8/29/2017 8/14/2017 4.290 3.810 3.220 2.650 1.400 1.220 1.470 1.020 0.700 10/10/2017 10/4/2017 2.680 1.270 0.600 0.800 12.600 1.610 0.600 0.600 1/22/2018 11/28/2017 0.700 0.722 2.540 0.700 0.700 0.700 0.700 0.700 0.700 1/22/2018 1-Iumiston & Moore Engineers I ClamPass-TIDE Agenda item#6a Page 1 of 2 CLan'1 Pass Tide Monitoring- Click here for Maintenance Dredging Project details Naz cuveirMa.ko MAR.NEK.4 MARK 7E6 �`. ? �r ate. � ��� c_ `i i,1,;,,,t,,,,,..„3\ .rY ,,i \_~. 1n;+ .0.Jc,r r+ a# c 1.):#1.,!)rill tt'i 4 .'�* R., a.' i, sr;1' , L.. a•t,e-, ,,,.Jtir..AY1s6�- .zl!',N` >•A '%'', a.4-.::4y h A,.,„,,e, Monthly Time Series 2018(Click on Thumhnols to Expand) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Mean Low TideTime Lass-2018 300.0 150.0 e 100,0 2 n Milker 4 3 150.0 r.1 Marker 14 •-`F. 12 Marker 26 li 100.0 � �� ahtatktr32 % •Gage not 50.0 working r. 0.0 Jan Feb Mar AM May fun Jul Aug Sep Oct Nov Oec Gage/Gulf Mean Tide Ratios-2018 0.9 0,8 0,7 •Gage not ,4 0.6 ................ ,....,....,............... Prot kmg O.S OMailer 4 } 0.4 nMaiktr14 ti Magical 16 ia0.3 a Marker 31 trrtcai 0.1 i 14140.0 tuna Hr Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Oec alta. Gage/Gulf Mean Tide Ratios-2017 0.9 uatoct 1+.14431-e oma 0.8 tr4jb1 Stun 0.7 Q a i i ) 7. oMarker 4 t nMarker 14 0.4 '; li Marker 26 i 0.3 ', ,, T [ taMarker 31 I. 0 1 \ ir Coital Sraiaty 0.1 ,; t 1414 r I Irit jj I 1 F4Ale foe Ian Feb Mar Apr May Jun Jul Aug Sep 0ti Nov Dec asIa. https://www.htunistonandmoore.com/clampass-tide 2/27/2018 Humiston & Moore Engineers ClainPass-TIDE Pale#5a of 5 Agenda i Page 2 of 2 Gage/Gulf Mean Tide Ratios-2016 0.9 i PASS t S. 0.8 tNt[OGft.°G i.S.CAUN t1ERMrRE 0.7 I, ' :,,,, rae°41,0S mMarker4 0•CMarker l4 la i flMaracr 26 §0.3 t I nMarler32 0.2 0.1 I . „. I 3 :x 4 titiaYfa tan Feb Mar Apr May tun hi Aug Sep Oct Nov Dec +s It 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 Lag:time difference between low tide in the Gulf of Mexico and at the gage's locations,averaged over a month In minutes.The time lag is also represenattive of the pass's effectiveness in flushing water from the bay.The higher the • lag the less efficient is flushing,indicating material accumulating in the pass. Background Clam Pass is a small wave dominated inlet on the southwest coast of Florida that provides a tidal connection to 500 acres of the wetland preserve of Clam Bay Natural Resource Protection Area(NRPA).This preserve includes several interconnected bays surrounded by extensive areas of mangrove wetlands.The preserve is a pristine environmental resource that is collectively known as Clam Bay.Clam Pass has gone through periods of inlet migration as well as closure,because the relatively small tidal prism for Clam Bay provides critical balance between tidal energy and littoral process at the inlet channel. Humiston&Moore Engineers provides professional engineering services to Pelican Bay Services Division of Collier County, Florida for Clam Pass and Clam Bay. Humiston & Moore Engineers provided engineering services to assist Turrell Hall& Associate in the development of the Clam Bay NRPA management plan of 1998 and the updated plan of 2014. The engineering services included the development of design criteria for the inlet stability and conditions for maintenance dredging to maintain hydraulic efficiency and avoid potential inlet closure including. The implementation of the NRPA management plan includes various monitoring to maintain the health of the eco system.In addition to the ecological and biological monitoring of the bay system and its function as a protected environmental resource, the monitoring program includes hydraulic and physical monitoring of the Inlet and bay system to monitor the stability of the pass and assess maintenance requirements.Monitoring of the hydraulic and physical conditions of the Clam Bay system continues according to the updated NRPA management plan. The hydraulic monitoring includes continuous water level and tidal data collection at 4 locations within the bay system. • https://www.huinistonandmoore.com/clampass-tide 2/27/2018 Agenda item#7d Page 1 of 1 SheaBarbara Subject: 1W: Bees From: "Jeremy Sterk"<ieremys@eteflorida.con<mailto:ieremys@eteflorida.com>> To:"JacobLisa"<Lisa.Jacob@colliercountyfl.gov<mailto:LisaJacob@colliercountvfl.gov>> Subject: Bees Do you think the clam bay committee or the Foundation would be interested in us setting up some bee boxes in the NRPA? Savannah Nease who works for us is a bee expert—she used to work for Wonderful Bees. She can set-up new hives with queens. I thought it might be something neat for the Pelican Bay membership and it would be beneficial for pollination of mangroves in the NRPA. She would be willing to do demonstrations,etc and she could produce a small amount of mangrove honey. We had a wild colony under our office trailer. She recently relocated the queen and colony into a new bee box—see attached photo. Let me know your thoughts. [cid:65551BD03CB46D4E82344580A8B3BE15@namprdll.prod.outlook.coml Under Florida Law,e-mail addresses are public records. If you do not want your e-mail address released in response to a public records request,do not send electronic mail to this entity. Instead,contact this office by telephone or in writing. 1 - - --' -- *).",.it:`4'.". ' - 47-:. -447,„,„...tilrf.„,,,A, ,,,„,;., , , .,, _ „ I --4,f,4',-.7.74*''.: ' N.• - -•'—t,::., 4,-.t ,* I- . - .%-' ---..• �' of r Y' >. � & .,. 4... ..... . . ,. -_ ,,,, ...f *- ,, ..' ,,, ..7,I. ' 4,-- ,';. - 7t. , -,:-,- , - -.1%! -, - ...4i. S 'tom M.. •, lit',iiii4.:,1116.., - ''4, .--, •104 - .- ' . A- '! -''' ,;.-.,-.4?"'"'.' , - .,. # ',4,':'4',,-"' ,x . ," , • ‘‘..'"'' , . i .. •1 a , ' a;y ,, , ........,:',.!:i.::::1,1---...,,".""' .. ' -" 2� 4 ti' ,�, � ,,,q ..ate ,..,,..,--,.f...,,, f Er 1 Agenda item#8 Page 1 of 1 DRAFT FY 19 Clam Bay Budget Current contracts and estimated costs 126,000 Earth Tech Clam Bay monitoring and annual report 31,880 Turrell, Hall Water quality monitoring and quarterly and annual reports 9,000 Humiston & Moore Monthly tidal analysis reports and aerial photos of Clam Pass and mangroves 16,500 Humiston & Moore Annual bathymetric and tidal analysis report and Clam Pass monitoring 18,500 County Lab Water quality analysis and monthly reports TBD Hand-dug channel maintenance 29,000 Earth Tech Exotic treatment 1,680 Verizon Transmittal of data from tidal gauges 720 Locher Web hosting for tidal gauges 7,600 Infrared aerial photo 44,000 Reserves for contingencies 7,000 County collection fees, etc. 291,8801 n.b. Fund 111 provides $150,000 for Clam Bay expenses 1 Amount to be increased after cost of hand-dug channel maintenance is determined. CLAM BA YNRPA MANAGEMENT PLAN Pelican Bay Services Division October 2014 Ver. 6.5 5.0 Clam Pass Dredging A. Dredging Policy There are two circumstances that could necessitate dredging Clam Pass. 1. Clam Pass closes or is in imminent danger of closure following a weather driven event. In this situation the inlet should be dredged as soon as possible. 2. The inlet has lost hydraulic efficiency and is jeopardizing the long-term health of floral and faunal communities of the Clam Bay NRPA. The scope and timing of any proposed dredging activity will be determined by reviewing and comparing current and past hydraulic, bathymetric and ecological monitoring data. In both cases the PBSD Board would, after consultation with and advice from qualified coastal engineers and biologists, approve and recommend an appropriate set of construction drawings for the dredging event to the BCC for its approval prior to the submittal to the regulatory agencies. Dredging will only be done for the health of the Clam Bay NRPA, not for navigation or beach renourishment. Beach-compatible sand removed as part of the dredging event will be spread on adjacent area beaches, as required by the permitting agencies. B. Hydraulic and Bathymetric Dredging Criteria The purpose of regular hydraulic and physical monitoring is to evaluate inlet characteristics on a comprehensive long term basis with less emphasis on short term or seasonal changes. To monitor the stability of Clam Pass, data on the variables listed below will be regularly collected and reviewed by qualified engineers. If data are not within the identified target ranges for the variables, further monitoring and/or intervention will be considered in conjunction with current ecological data. See Appendix 5 for additional information on the dredging criteria. 1. Bay Tide Range Tidal range data have been collected annually since 1999 and will continue to be collected and reported to the consulting engineer at least quarterly. An annual tidal analysis report will be included with the annual report. Data are collected from gauges at four locations(Clam Pass Park Boardwalk, Pelican Bay South Boardwalk, Pelican Bay North Boardwalk, and Upper Clam Bay). These gauges provide a record of the tidal range within Clam Bay and are one indication of the tidal prism or volume of water flowing through Clam Pass at each tidal cycle. 43 Notes on 2017 WQ annual report COPPER • 16 of 98 samples exceeded the FDEP standard, slightly more than the allowable 15 of 98, but technically out of compliance with the FDEP standard • 90%of samples that exceeded the standard were at Stations 1, 2, &3. • In 201615 of 108 samples exceeded the standard, less than the allowable 16 of 108 samples so copper was in compliance with FDEP standard; only 50%of the samples that exceeded standard were at Stations 1, 2, & 3 • Recommendation from report: explore sources of copper in nearly ponds in Upper Clam Bay TOTAL PHOSPHORUS • 33 of 98 samples(34%)exceeded allowable limits, significantly more than the allowable 10% • The number of exceedances at each sampling site ranged from 3 to 5 so TP exceedances were found throughout Clam Bay with the highest rates of exceedances in February to May,a time of year when wading birds may be nesting in Clam Bay. July and August, months typically with high levels of stormwater runoff, had lower rates.Thus the speculation that the presence of nesting birds may be having a greater impact of high phosphorus levels than stormwater run-off. • In 2016 20 of 107 samples(19%) exceeded allowable limits • Recommendation from report: explore seasonal changes in abundance of wading birds, especially nesting habits. DISSOLVED OXYGEN • 13 of 98 samples(13%) had levels lower than existing guidance criteria from FDEP, slightly higher than the 10%allowed by FDEP. • In 2016 6 of 108 samples (6%) had levels lower than FDEP standard which is lower than the FDEP standard. TOTAL NITROGEN • 3 of 98 samples exceeded the upper limits, less than the allowable 10%. REQUEST • That water clarity data be collected for water samples in Clam Bay and that hardness data be collected for water samples in the berm sites. SUGGESTIONS • Eliminate the fourth quarter Tomasko report. • Simplify Quarters 1-3 reports to a table similar to Table 1 on page 6 so TN and TP results for each quarter are known. • Use balance of annual WQ funds, as needed, to explore recommendations cited above, namely sources of copper in nearby ponds in Upper Clam Bay and seasonal changes in abundance of wading birds, especially nesting habits, in Upper Clam Bay. Prepared by Susan O'Brien March 4, 2018 "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 Upper Limits for TP and TN concentrations noted above are derived based on Equations 1 and 2, respectively: Equation 1: TP Upper Limit(mg/L)= e(-1.06256-0.0000328465`Conductivity(ps)) Equation 2: TN Upper Limit(mg/L)= 2.3601 —0.0000268325*Conductivity(i1S) The nutrient dataset examined 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. TN and TP concentrations were compared to the derived upper limit thresholds to quantify the presence or absence of elevated concentrations of TP and/or TN, with results listed in (Appendix A). Over the period analyzed (November 2016 to October 2017), a total of three (3) ambient water quality values for TN exceeded the respective TN Upper Limit, for an exceedance frequency of approximately 3 percent. In comparison, 33 of the 98 TP measurements (approximately 34 percent) exceeded their respective TP Upper Limit. Based on these results, the frequency of exceedance would not be high enough for the waters of Clam Bay to be determined to be impaired for TN, but those same waters would be determined to be impaired for TP. Table 1 displays the results in a manner intended to allow for a quick visualization or results by month and by station. Sampling locations and months are color coded as to the results, with green representing "passing" values, boxes with an "x" representing data that numerically exceed established criteria. In addition, boxes in yellow represent values within the error rate (i.e., ±5 percent) of threshold criteria, whether in exceedance, or slightly below exceedance. Table 1. Representation of frequency of impairment for TN and TP for different site and date combinations. Green represents sample clearly not out of compliance with criteria. Boxes with "x" represent values out of compliance with criteria. Boxes in yellow with "x" represent data out of compliance, but within the range of resolution of laboratory values(i.e., ±5 percent) and/or rounding errors. Boxes in yellow but without "x" represent values in compliance, but also within range of resolution of laboratory values (i.e., ±5 percent)and/or rounding errors. Clear cells represent a lack of data. Month 1 2 3 4 5 6 7 8 9 TN TP TN TP TN TP TN TP TN TP TN TP TN TP TN TP TN TP Nov-16 ;` Dec-16 Jan-17 Feb-17 Mar-17 _177-I Apr-17 May-17 Jun-17 Jul 17 Aug-17 ., a_ Sep-17 Oct-17 __ '441,,;:% ` ara ` A; x, a X " .9 e. 6