Middle St. Johns - Florida Department of Environmental Protection

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156 Water Quality Assessment Report: Middle St. Johns Table 4.2 (contined) Planning Unit Lake George Unit Lake George Unit Lake George Unit Lake George Unit WBID 2213O Waterbody Segment St. Johns River Above Ocklawaha River 2892 Lake Margaret 2893A Lake George 2893A1 St. Johns River Below Lake George Waterbody Type Stream Lake Lake Stream 1998 303(d) Parameters of Concern Parameters Identified Using the 2002 Impaired Surface Waters Rule Nutrients (Chlorophyll a) Mercury in Fish Nutrients (TSI) Nutrients (Chlorophyll a) Priority for TMDL Development * Projected Year for TMDL Development * Comments Medium 2008 Colimitation of N and P based on a TN/TP median of 25 (77 values) during the planning period and a median of 25 (93 values) during the verified period. Planning period: 3 Chlorophyll a annual means exceeded 20 μg/L (1998–2000); verified period: 5 Chlorophyll a annual means exceeded 20 μg/L (1998–2002). 140 TN values, median 0.06 mg/L. 140 TP values, median 1.47 mg/L. Medium 2011 Mercury in Fish met verification threshold of IWR. Fish tissue levels in 20 samples averaged 0.7830 ppm in 2002. Medium 2008 Colimitation of N and P based on a TN/TP median of 20 (579 values) during the planning period and a median of 21 (551 values) during the verified period. Planning period: 9 TSI annual means exceeded 60 (1991– 1992, 1994–2000); verified period: 7 TSI annual means exceeded 60 (1996–2002). 223 TN values, median 1.17 mg/L. 771 TP values, median 0.07 mg/L. Medium 2008 Colimitation of N and P based on a TN/TP median 24 (235 values) during the planning period and a median of 24 (140 values) during the verified period. Planning period: 7 Chlorophyll a annual means exceeded 20 μg/L (1994–2000); verified period: 7 Chlorophyll a annual means exceeded 20 μg/L (1996–2002). 140 TN values, median 0.06 mg/L. 140 TP values, 1.47 mg/L.
Water Quality Assessment Report: Middle St. Johns 157 Table 4.2 (contined) Planning Unit Lake George Unit Lake George Unit Lake George Unit Lake Jesup WBID Waterbody Segment 2893A2 St. Johns River Above Lake George 2893A2 St. Johns River Above Lake George 2916B Grasshopper Lake 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 Stream DO Medium 2008 Planning period: 37/112 values below DO criterion; verified period: 21/73 values below DO criterion. DO met verification threshold of IWR and nutrients are the causative pollutant. 200 DO values, median 5.68 mg/L, mean 5.69 mg/L, range 0.28–9.23 mg/L. Stream Lake Nutrients (Chlorophyll a) Mercury in Fish 2981 Lake Jesup Lake Nutrients Nutrients (TSI) Medium 2008 Colimitation of N and P based on a TN/TP median of 17 (120 values) in the planning period and a median of 16 (80 values) in the verified period. Planning period: 3 Chlorophyll a annual means exceeded 20 μg/L (1992, 1993, 1999), 123 TN values, median 1.19 mg/L, 124 TP values, median 0.07 mg/L; verified period: 1 Chlorophyll a annual mean exceeded 20 μg/L (1999), 83 TN values, median 1.132 mg/L, 80 TP values, median 0.07 mg/L. Medium 2011 Mercury in Fish met verification threshold of IWR. Fish tissue levels in 20 samples averaged 1.55 ppm in 2000. High 2004 Colimitation of N and P based on a TN/TP median of 16 (1077 values) in the planning period and a median of 18 (829 values) in the verified period. Planning period: 10 TSI annual means exceeded 60 (1991–2000); verified period: 7 TSI annual means exceeded 60 (1996–2002). 198 TN values, median 2.47 mg/L. 1279 TP values, median 0.15 mg/L.
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Middle St. Johns - Florida Department of Environmental Protection

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