Middle St. Johns - Florida Department of Environmental Protection

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262 Water Quality Assessment Report: Middle St. Johns WBID Waterbody Segment Name 2991 Econlockhatchee River 2991 Econlockhatchee River 2991 Econlockhatchee River 2991 Econlockhatchee River 2991 Econlockhatchee River 2991 Econlockhatchee River 2991 Econlockhatchee River Waterbody Type Waterbody Class 1998 303(d) Parameters of Concern Parameters Identified Using the IWR Proposed Status Stream 3F Biology Not Impaired Stream 3F Chromium3 Not Impaired Stream 3F Dissolved Oxygen Not Impaired Stream 3F Fecal Coliform Bacteria Verified List Stream 3F Iron Not Impaired Stream 3F Mercury (in fish Planning tissue) List Stream 3F Nickel 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 2 Low dissolved oxygen is a natural condition, and based on bioassessment results, aquatic life use support is being maintained (8 passing bioassessments 1992- 2000). Nutrients (TN and TP) and BOD are all within acceptable ranges. 41 TN values, median 0.93 mg/l. 44 TP values, median 0.05 mg/l. 41 BOD values, median 1.9 mg/l. PP - 78/194 values below DO criterion. VP - 14/51 values below DO criterion. The two most dominant land uses in this area are upland forests (21% of total) and wetlands (37% of total). 5 Medium 2008 PP - 16/116 values exceed criterion. VP - 5/21 values exceed criterion. Coliform median 110 colonies/100ml, range 10 - 2301 colonies/100ml. No more than 3 values per month. 2 3c Mercury (in fish tissue) met verification threshold of IWR, but need to confirm 7.5 year age of data. Consumption advisory issued in 1993 for largemouth bass, gar and bowfin. 2
Water Quality Assessment Report: Middle St. Johns 263 WBID Waterbody Segment Name 2991 Econlockhatchee River 2991 Econlockhatchee River 2991 Econlockhatchee River 2991 Econlockhatchee River 2991A Econlockhatchee River 2991A Econlockhatchee River 2991A 2991A 2991A Econlockhatchee River Econlockhatchee River Econlockhatchee River Waterbody Type Waterbody Class 1998 303(d) Parameters of Concern Parameters Identified Using the IWR Proposed Status Stream 3F Nutrients (Chla) Not Impaired Stream 3F Turbidity Not Impaired Stream 3F Un-Ionized Not Ammonia Impaired Stream 3F Zinc Not Impaired Stream 3F Biology Not Impaired Stream 3F BOD BOD Not Impaired Stream 3F Cadmium Not Impaired Stream 3F Chromium3 Not Impaired Stream 3F Copper Not Impaired Integrated Report Category 1 2 2 2 2 2 Priority for TMDL Development 2 Projected Comments 3 Year for TMDL Development Period 2 (# Exceedances/ # Samples) PP= Planning Period VP= Verified 2 Delist. BOD median below screening level (181 BOD values, median 1.7 mg/l, range 0 - 6.6 mg/l), and DO is not impaired.. 2 2 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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