Middle St. Johns - Florida Department of Environmental Protection

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304 Water Quality Assessment Report: Middle St. Johns WBID Waterbody Segment Name Waterbody Type Waterbody Class 1998 303(d) Parameters of Concern Parameters Identified Using the IWR Proposed Status 2997I Lake Sue Lake 3F Fecal Coliform Bacteria Not Impaired 2997I Lake Sue Lake 3F Nutrients (TSI) Planning List 2997I Lake Sue Lake 3F Total Coliform Bacteria Not Impaired 2997I Lake Sue Lake 3F Turbidity Not Impaired 2997I Lake Sue Lake 3F Un-Ionized Not Ammonia Impaired 2997I Lake Sue Lake 3F Zinc Not Impaired 2997J Lake Rowena Lake 3F Dissolved Oxygen Not Impaired 2997J Lake Rowena Lake 3F Fecal Coliform Not Bacteria Impaired 2997J Lake Rowena Lake 3F Nutrients (TSI) Planning List 2997J Lake Rowena Lake 3F Total Coliform Bacteria Not Impaired 2997J Lake Rowena Lake 3F Turbidity Not Impaired 2997J Lake Rowena Lake 3F Un-Ionized Not Ammonia Impaired Integrated Report Category 1 2 Priority for TMDL Development 2 Projected Comments 3 Year for TMDL Development Period 2 (# Exceedances/ # Samples) PP= Planning Period VP= Verified 3c TSI met planning list but does not meet the verification threshold of the IWR. Phosphorus limited. PP - 1 TSI annual mean exceed threshold. VP - 0 TSI annual means exceed threshold. 2 2 2 2 2 2 3c Co-limitation by nitrogen and phosphorus. PP - 2 TSI annual means exceed threshold of 60. VP - 0 TSI annual means exceed threshold of 60. 228 TN values, median 0.77 mg/L, mean 0.81 mg/L. 310 TP values, median 0.04 mg/L, mean 0.22 mg/L. Need to continue to investigate a more appropriate TSI threshold for the lakes in the Orlando Ridge area. 2 2 2
Water Quality Assessment Report: Middle St. Johns 305 WBID Waterbody Segment Name Waterbody Type Waterbody Class 1998 303(d) Parameters of Concern Parameters Identified Using the IWR Proposed Status 2997K Lake Estelle Lake 3F Dissolved Oxygen Not Impaired 2997K Lake Estelle Lake 3F Fecal Coliform Not Bacteria Impaired 2997K Lake Estelle Lake 3F Nutrients (TSI) Planning List 2997K Lake Estelle Lake 3F Un-Ionized Ammonia Not Impaired 2997L Lake Winyah Lake 3F Dissolved Oxygen Not Impaired 2997L Lake Winyah Lake 3F Fecal Coliform Not Bacteria Impaired 2997L Lake Winyah Lake 3F Nutrients (TSI) Verified List 2997L Lake Winyah Lake 3F Un-Ionized Ammonia Not Impaired Integrated Report Category 1 2 2 Priority for TMDL Development 2 Projected Comments 3 Year for TMDL Development Period 2 (# Exceedances/ # Samples) PP= Planning Period VP= Verified 3c Co-limitation by nitrogen and phosphorus based on a TN/TP median of 22 (602 values) in the PP and a median of 23 (437 values) in the VP. PP - 2 TSI annual means exceeded 60 threshold (1993-1994). VP - 1 TSI annual means exceeded 40 (2002). 722 TN values, median 0.79 mg/L. 720 TP values, median 0.036 mg/L. Need to continue to investigate a more appropriate TSI threshold for the lakes in the Orlando Ridge area. 2 2 2 5 Medium 2008 Co-limitation of nitrogen and phosphorus based on a TN/TP median of 13 (275 values) during the PP and a median of 13 (191 values) during the VP. PP - 7 TSI annual means exceeded 60 (1991- 1998). VP - 3 TSI annual means exceeded 60 (1996-1998, 2001). 269 TN values, median 0.81 mg/L, mean 0.85 mg/L. 269 TP values, median 0.061 mg/L, mean 0.06 mg/L. 2
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FLORIDA DEPARTMENT OF ENVIRONMENTAL
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Middle St. Johns - Florida Department of Environmental Protection

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