Middle St. Johns - Florida Department of Environmental Protection

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266 Water Quality Assessment Report: Middle St. Johns WBID Waterbody Segment Name 3001 Little Econlockhatchee River 3001 Little Econlockhatchee River 3001 Little Econlockhatchee River 3001 Little 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 BOD BOD Not Impaired Stream 3F Chromium3 Not Impaired Stream 3F Dissolved Oxygen Dissolved Oxygen 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 Though biology was planning listed due to a failed bioassessment in 1992, there are several passing bioassessment scores in the verified period (1996, 1999, 2000, and 2002) from which to conclude this segment is not impaired for biology. 2 Delist. While BOD median is at screening level (537 BOD values, median 2.0 mg/l, range 0.1 - 20.4 mg/l), the DO is not impaired. BOD data has shown an improving trend in verified period. 80% of the BOD values present in the verified period are less than or equal to the MDL. 2 2 Delist. Dissolved oxygen is naturally low, and bioassessment data indicate that aquatic life use support is being maintained (Passing bioassessments in 1996, 1999, 2000 and 2002). Nutrients (TN and TP) and BOD are all within acceptable ranges. 348 TN values, median 0.92 mg/l. 367 TP values, median 0.09 mg/l. 537 BOD values, median 2.0 mg/l. PP - 137/413 values below DO criterion. VP - 70/297 values below DO criterion. 656 DO values, median 5.8 mg/L, mean 5.83 mg/L, range 0.17 - 61.3 mg/L. The dominant land use is defined as urban (50%).
Water Quality Assessment Report: Middle St. Johns 267 WBID Waterbody Segment Name 3001 Little Econlockhatchee River 3001 Little Econlockhatchee River 3001 Little Econlockhatchee River 3001 Little Econlockhatchee River 3001 Little Econlockhatchee River Waterbody Type Waterbody Class 1998 303(d) Parameters of Concern Stream 3F Coliform Bacteria Parameters Identified Using the IWR Fecal Coliform Bacteria Proposed Status Verified List Stream 3F Nickel Not Impaired Stream 3F Nutrients Nutrients (Chla) Not Impaired Stream 3F Coliform Bacteria Total Coliform Bacteria Not Impaired Stream 3F Turbidity 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 Low 2008 PP - 72/381 values exceed criterion. VP - 41/248 values exceed criterion. Coliform median 108 colonies/100ml, range 2 - 6,801 colonies/100ml. No more than 6 values per month. 2 2 Delist. PP - 0 chla annual means exceeded 20 ug/l, 514 chla values, range of chla values 0 - 107 ug/L, mean chla over entire period 4.99 ug/L. VP - 0 chla annual means exceeded 20 ug/l, 271 chla values, range of chla values 0.38 - 107 ug/L, mean chla over entire period 3.92 ug/L. The annual mean chla concentrations were: 1991-7.9 ug/l, 1992-5.2 ug/l, 1993-2.5 ug/l, 1994- 3.1 ug/l, 1995-4.0 ug/l, 1996-8.7 ug/l, 1997-3.0 ug/l, 1998-2.7 ug/l, 1999-2.6 ug/l, 2000-3.1 ug/l, 2001- 1.5 ug/l, and 2002-1.1 ug/l. 348 TN values, median 0.92 mg/l. 367 TP values, median 0.09 mg/l. 2 Delist. PP - 46/334 values exceed criterion. VP - 26/206 values exceed criterion, coliform median 510 colonies/100mL, range 0 - 12,000 colonies/100mL. No more than 6 values per month. 2
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Middle St. Johns - Florida Department of Environmental Protection

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