Middle St. Johns - Florida Department of Environmental Protection

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356 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 3004C Lake Lawne Lake 3F Fecal Coliform Bacteria Not Impaired 3004C Lake Lawne Lake 3F Mercury (in water) Planning List 3004C Lake Lawne Lake 3F Nickel Not Impaired 3004C Lake Lawne Lake 3F Nutrients (TSI) Verified List 3004C Lake Lawne Lake 3F Total Coliform Bacteria Not Impaired 3004C Lake Lawne Lake 3F Turbidity Not Impaired 3004C Lake Lawne Lake 3F Un-Ionized Not Ammonia Impaired 3004C Lake Lawne Lake 3F Zinc Not Impaired 3004D Silver Lake Lake 3F Dissolved Oxygen Not Impaired 3004D Silver Lake Lake 3F Fecal Coliform Not Bacteria 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 Mercury in water met the planning list threshold, but need to confirm clean sampling and analytical methodology was used in water sample analysis. 2 5 Medium 2008 Co-limitation by nitrogen and phosphorus based on a TN/TP median of 13 (320 values) during the PP and a median of 17 (98 values) during the VP. PP - 6 TSI annual means exceeded 60 (1991- 1994, 1996, 1997). VP - 2 TSI annual means exceeded 60 (1996, 1997). 27 TN values, median 1.48 mg/L, mean 1.57 mg/L. 404 TP values, median 0.128 mg/L, mean 0.203 mg/L. 2 2 2 2 2 2
Water Quality Assessment Report: Middle St. Johns 357 WBID Waterbody Segment Name Waterbody Type Waterbody Class 1998 303(d) Parameters of Concern Parameters Identified Using the IWR Proposed Status 3004D Silver Lake Lake 3F Nutrients (TSI) Verified List 3004D Silver Lake Lake 3F Total Coliform Bacteria Not Impaired 3004D Silver Lake Lake 3F Turbidity Not Impaired 3004D Silver Lake Lake 3F Un-Ionized Not Ammonia Impaired 3004E Lake Daniel Lake 3F Dissolved Oxygen Not Impaired 3004E Lake Daniel Lake 3F Fecal Coliform Not Bacteria Impaired 3004E Lake Daniel Lake 3F Nutrients (TSI) Planning List 3004E Lake Daniel Lake 3F Un-Ionized Ammonia Not Impaired Integrated Report Category 1 Priority for TMDL Development Projected Year for TMDL Development Comments 3 (# Exceedances/ # Samples) PP= Planning Period VP= Verified Period 5 Medium 2008 Co-limitation by nitrogen and phosphorus based on a TN/TP median of 25 (237 values) during the PP and a median of 27 (118 values) during the VP. PP - 0 TSI annual means exceed threshold of 60. VP - 1 TSI annual means exceed threshold of 60 (1998). 173 TN values, median 0.64 mg/L, mean 0.76 mg/L. 224 TP values, median 0.027 mg/L, mean 0.04 mg/L. 2 2 2 2 2 3c Co-limitation by nitrogen and phosphorus based on a TN/TP median of 23 (126 values) during the PP and a median of 24 (65 values) during the VP. PP - 0 TSI annual means exceeded 60. VP - 1 TSI annual mean exceeded 40 (2002). 65 TN values, median 0.82 mg/L. 65 TP values, median 0.034 mg/L. Need to continue to investigate a more appropriate TSI threshold for the lakes in the Orlando Ridge area. 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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