Middle St. Johns - Florida Department of Environmental Protection

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152 Water Quality Assessment Report: Middle St. Johns Table 4.2 (contined) Planning Unit Deep Creek Unit Deep Creek Unit Deep Creek Unit Deep Creek Unit Econlockhatchee River WBID Waterbody Segment 2931 Lake Winnemissett 2964A 2964A 2964A Lake Harney Lake Harney Lake Harney 2991 Econlockhatchee River Waterbody Type 1998 303(d) Parameters of Concern Parameters Identified Using the 2002 Impaired Surface Waters Rule Priority for TMDL Development * Projected Year for TMDL Development * Comments Lake Lead Medium 2008 Planning period: 8/26 values exceed criterion; verified period: 6/21 values exceed criterion. Lake DO DO Low 2008 Planning period: 90/306 values below DO criterion; verified period: 31/121 values below DO criterion. DO met verification threshold of IWR and nutrients are the causative pollutant. 509 DO values, median 6.27 mg/L, mean 6.32 mg/L, range 11.8–0.42 mg/L. Lake Mercury in Fish Lake Nutrients Nutrients (TSI) Stream Fecal Coliform Bacteria Medium 2011 Mercury in Fish met verification threshold of IWR. Fish tissue levels in 20 samples averaged 0.5420 ppm in 2000. Low 2008 Colimitation of N and P based on a TN/TP median of 24 (541 values) during the planning period and a median of 19 (242 values) during the verified period. Planning period: 1 TSI annual mean exceeded 60 (2000); verified period: 2 TSI annual means exceeded 60 (2000–2001). 548 TN values, median 1.28 mg/L. 554 TP values, median 0.052 mg/L. Medium 2008 Planning period: 16/116 values exceed criterion; verified period: 5/21 values exceed criterion. Coliform median 110 colonies/100 ml, range 10–2301 colonies/ 100 ml. No more than 3 values per month.
Water Quality Assessment Report: Middle St. Johns 153 Table 4.2 (contined) Planning Unit Econlockhatchee River Econlockhatchee River Econlockhatchee River Econlockhatchee River Econlockhatchee River WBID Waterbody Segment 3001 Little Econlockhatchee River 3014 Crane Strand Drain 3014 Crane Strand Drain 3014 Crane Strand Drain 3023 Crane Strand Waterbody Type Stream Stream Stream Stream Stream 1998 303(d) Parameters of Concern Coliform Bacteria DO and BOD Parameters Identified Using the 2002 Impaired Surface Waters Rule Fecal Coliform Bacteria DO and BOD Fecal Coliform Bacteria Total Coliform Bacteria Fecal Coliform Bacteria Priority for TMDL Development * Projected Year for TMDL Development * Comments Low 2008 Planning period: 72/381 values exceed criterion; verified period: 41/248 values exceed criterion. Coliform median 108 colonies/100 ml, range 2–6,801 colonies/ 100 ml. No more than 6 values per month. High 2004 Planning period: 1/4 values below DO criterion; verified period: 11/30 values below DO criterion. DO met verification threshold of IWR and BOD is causative pollutant. (BOD median = 2.25 mg/L). 30 DO values, median 5.95 mg/L, mean 6.11 mg/L, range 2.87–10.95 mg/L. High 2004 Planning period: 0/3 values exceeded criterion; verified period: 7/28 values exceed criterion. Coliform median 182.5 colonies/100 ml, range 1.0–5,800 colonies/100 ml. No more than 4 values per month. High 2004 Planning period: 0/1 values exceed criterion; verified period: 5/20 values exceed criterion. Coliform median 1,500 colonies/100 ml, range 1–21,000 colonies/100 ml. No more than 4 values per month. High 2004 Planning period: 14/40 values exceed criterion; verified period: 10/20 values exceed criterion. Coliform median 300 colonies/100 ml, range 10–6,000 colonies/100 ml. No more than 2 values per month.
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Middle St. Johns - Florida Department of Environmental Protection

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