Middle St. Johns - Florida Department of Environmental Protection

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154 Water Quality Assessment Report: Middle St. Johns Table 4.2 (contined) Planning Unit Econlockhatchee River Econlockhatchee River Econlockhatchee River Econlockhatchee River Econlockhatchee River WBID Waterbody Segment 3023 Crane Strand 3023A 3023A 3023A 3024A Lake Baldwin Outfall Lake Baldwin Outfall Lake Baldwin Outfall Trib. to Little Econ. River Waterbody Type Stream Stream Stream Stream 1998 303(d) Parameters of Concern Parameters Identified Using the 2002 Impaired Surface Waters Rule Total Coliform Bacteria Fecal Coliform Bacteria Nutrients (Chlorophyll a) Total Coliform Bacteria Priority for TMDL Development * Projected Year for TMDL Development * Comments High 2004 Planning period: 14/38 values exceed criterion; verified period: 10/20 values exceed criterion. Coliform median 810 colonies/100 ml, range 40–16,300 colonies/ 100 ml. No more than 2 values per month. Medium 2008 Planning period: 19/36 values exceed criterion; verified period: 12/21 values exceed criterion. Coliform median 510 colonies/100 ml, range 30–4,100 colonies/ 100 ml. No more than 2 values per month. Medium 2008 Colimitation of N and P based on a TN/TP median of 21 (63 values) during the planning and a median of 30 (37 values) during the verified period. Planning period: 1 Chlorophyll a annual mean exceeded 20 μg/L (1998); verified period: 1 Chlorophyll a annual mean exceeded 20 μg/L (1998). 38 TN values, median 1.12 mg/L. 38 TP values, median 0.04 mg/L. Medium 2008 Planning period: 14/35 values exceed criterion; verified period: 9/21 values exceed criterion. Coliform median 1,480 colonies/ 100 ml, range 80–8,000 colonies/100 ml. No more than 2 values per month. Stream DO Medium 2008 Planning period: 12/30 values below DO criterion; verified period: 7/20 values below DO criterion. DO met verification threshold of IWR, and N is the causative pollutant. TN median = 2.73 mg/L. 58 DO values, mean 5.63 mg/L, median 5.58 mg/L, range 3–12.9 mg/L.
Water Quality Assessment Report: Middle St. Johns 155 Table 4.2 (contined) Planning Unit Econlockhatchee River Econlockhatchee River Econlockhatchee River Econlockhatchee River Econlockhatchee River Econlockhatchee River WBID 3024A 3024A Waterbody Segment Trib. to Little Econ. River Trib. to Little Econ. River 3030 Long Branch 3030 Long Branch 3030 Long Branch 3030 Long Branch Waterbody Type Stream Stream Stream Stream 1998 303(d) Parameters of Concern DO and BOD Coliform Bacteria Parameters Identified Using the 2002 Impaired Surface Waters Rule Fecal Coliform Bacteria Total Coliform Bacteria DO and BOD Fecal Coliform Bacteria Priority for TMDL Development * Projected Year for TMDL Development * Comments Medium 2008 Planning period: 18/32 values exceed criterion; verified period: 11/20 values exceed criterion. Coliform median 440 colonies/100 ml, range 8–3,100 colonies/ 100 ml. Medium 2008 Planning period: 14/34 values exceed criterion; verified period: 10/20 values exceed criterion. High 2004 Planning period: 3/5 values below DO criterion; verified period: 26/28 values below DO criterion. DO met verification threshold of IWR and BOD is causative pollutant. (BOD median = 2.6 mg/L). 31 DO values, median 3.6 mg/L, mean 3.43 mg/L, range 0.52–6.1 mg/L. High 2004 Planning period: 1/1 values exceed criterion; verified period: 13/26 values exceed criterion. Coliform median 440 colonies/100 ml, range 8–3,100 colonies/100 ml. No more than 6 values per month. Stream Iron Iron High 2004 Planning period: 0/0 values exceed criterion; verified period: 12/26 values exceed criterion. Stream Coliform Bacteria Total Coliform Bacteria High 2004 Planning period: 0/0 values exceed criterion; verified period: 11/26 values exceed criterion. Coliform median 2,250 colonies/100 ml, range 434–27,000 colonies/100 ml. No more than 5 values per month.
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Middle St. Johns - Florida Department of Environmental Protection

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