Middle St. Johns - Florida Department of Environmental Protection

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288 Water Quality Assessment Report: Middle St. Johns WBID Waterbody Segment Name 2984 Six Mile Creek (formerly Lake Nan) Waterbody Type Waterbody Class 1998 303(d) Parameters of Concern Parameters Identified Using the IWR Stream 3F Un-Ionized Ammonia Proposed Status Not Impaired 2984A Lake Jennie Lake 3F Insufficient Data 2985 Chub Creek Stream 3F Dissolved Oxygen Verified List 2985 Chub Creek Stream 3F Iron Verified List 2985 Chub Creek Stream 3F Nutrients (Chla) Verified List 2985 Chub Creek Stream 3F Turbidity Not Impaired 2985 Chub Creek Stream 3F Un-Ionized Not Ammonia Impaired 2986 Soldier Creek Stream 3F Biology Not Reach Impaired 2986 Soldier Creek Stream 3F Cadmium Not Reach Impaired 2986 Soldier Creek Stream 3F Copper Not Reach Impaired Integrated Report Category 1 2 3b Priority for TMDL Development 2 Projected Comments 3 Year for TMDL Development Period 2 (# Exceedances/ # Samples) PP= Planning Period VP= Verified 5 Medium 2008 PP - 58/67 values below DO criterion. VP - 40/47 values below DO criterion. DO met verification threshold of IWR and nitrogen and phosphorus are causative pollutants (TN median = 2.3 mg/L, TP median = 0.37 mg/L). 68 DO values, median 1.99 mg/L, mean 2.61 mg/L, range 8.55 - 0.29 mg/L. 5 Medium 2008 PP - 15/44 values exceed criterion. VP - 15/44 values exceed criterion. 5 Medium 2008 Co-limitation of nitrogen and phosphorus based on a TN/TP median of 10 (67 values) during the PP and a median of 10 (47 values). PP - 3 chla annual means exceeded 20 ug/l (1995-1997). VP - 2 chla annual means exceeded 20 ug/l (1996-1997). 47 TN values, median 2.3 mg/L. 68 TP values, median 0.37 mg/L. 2 2 2 2 2
Water Quality Assessment Report: Middle St. Johns 289 WBID Waterbody Segment Name 2986 Soldier Creek Reach 2986 Soldier Creek Reach 2986 Soldier Creek Reach 2986 Soldier Creek Reach 2986 Soldier Creek Reach 2986 Soldier Creek Reach Waterbody Type Waterbody Class 1998 303(d) Parameters of Concern Stream 3F Dissolved Oxygen Parameters Identified Using the IWR Proposed Status Dissolved Oxygen Not Impaired Stream 3F Coliform Bacteria Fecal Coliform Bacteria Planning List Stream 3F Iron Not Impaired Stream 3F Lead Lead Planning List Stream 3F Nickel Not Impaired Stream 3F Nutrients Nutrients (Chla) 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 2 Delist. Low dissolved oxygen is a natural condition, and based on bioassessment results, aquatic life use support is being maintained [Passing bioassessments in 1996, 2000, and 2002). Nutrients (TN and TP) and BOD are all within acceptable ranges. 270 TN values, median 0.97 mg/l. 270 TP values, median 0.14 mg/l. 21 BOD values, median 1.0 mg/l. PP - 36/192 values below DO criterion. VP - 37/177 values below DO criterion. 275 DO values, median 6.38 mg/L, mean 5.98 mg/L, range 0.12 - 10.82 mg/L. The dominant landuse is defined as urban (59% of total). 3c (Low) (2008) PP - 5/15 values exceed criterion. VP - 8/13 values exceed criterion. 2 3c (Low) (2008) PP - 5/19 values exceed criterion. VP - 0/14 values exceed criterion. 2 2 PP - 0 chla annual means exceeded 20 ug/l. VP - 0 chla annual means exceeded 20 ug/l. 262 chla values, mean 2.52 ug/l, median 0.7 ug/l, range 0.0 - 42.7. The annual mean chla concentrations were: 1992-2.05 ug/l, 1994-1.09 ug/l, 1995-3.88 ug/l, 1996-3.88 ug/l, 1997-2.32 ug/l, 1998-4.70 ug/l, 1999-2.44 ug/l, and 2000-3.61 ug/l. 270 TN values, median 0.97 mg/l. 270 TP values, median 0.14 mg/l.
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Middle St. Johns - Florida Department of Environmental Protection

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