Section 62-304.300 - St. Marks River Basin TMDLs(1) Munson Slough Above Lake Munson. The bacteriological TMDL for Munson Slough is 400 counts/100mL for fecal coliform, and is allocated as follows: (a) The WLA for wastewater point sources is not applicable;(b) The WLA for discharges subject to the Department's NPDES MS4 Permitting Program is to address anthropogenic sources in the basin such that in-stream concentrations meet the fecal coliform criteria which, based on the measured concentrations from the 2006 period, will require a 31.6% reduction at sources contributing to exceedances of the criteria at Roberts Ave., and for the 2006 period, will require a 96.9% reduction at sources contributing to exceedances of the criteria at Springhill Road, and for the 1992 to 2007 period, will require a 91.5% reduction at sources contributing to exceedances of the criteria at Capital Circle S.W.; and(c) The LA for nonpoint sources is to address anthropogenic sources in the basin such that in-stream concentrations meet the fecal coliform criteria which, based on the measured concentrations from the 2006 period, will require a 31.6% reduction at sources contributing to exceedances of the criteria at Roberts Ave., and for the 2006 period, will require a 96.9% reduction at sources contributing to exceedances of the criteria at Springhill Road, and for the 1992 to 2007 period, will require a 91.5% reduction at sources contributing to exceedances of the criteria at Capital Circle S.W.(2) Upper Wakulla River. The nitrate-nitrite TMDL to address the biological impairment is an in-stream monthly mean concentration of 0.35 mg/L and is allocated as follows: (a) The WLA for wastewater sources is not applicable;(b) The WLA for discharges subject to the Department's NPDES MS4 Permitting Program is not applicable; and(c) The LAs for nonpoint sources are to address anthropogenic sources in the basin such that in-stream nitrate-nitrite concentrations meet the TMDL target, which, based on the mean concentrations from the 2002-2007 period, will require a 56.2% reduction of nitrate-nitrite at sources contributing to the observed biological impairment.(3) Munson Slough Above Lake Munson. The DO TMDLs are BOD of 2.00 mg/L, TN of 0.72 mg/L, and TP of 0.15 mg/L and are allocated as follows: (a) The WLA for wastewater point sources is not applicable;(b) The WLA for discharges subject to the Department's NPDES MS4 Permitting Program is to address anthropogenic sources in the basin such that in-stream concentrations meet the DO dissolved oxygen criterion and TMDL concentrations, which, based on the median concentrations from the 1973-2007 period, will require a 50% reduction for BOD, BOD5, an 8.35% reduction for TN, and a 17.53% reduction for TP at sources contributing to exceedances of the criterion and TMDLs; and(c) The LAs for nonpoint sources are to address anthropogenic sources in the basin such that in-stream concentrations meet the DO criterion and the TMDL concentrations, which, based on the median concentrations from the 1973-2007 period, will require a 50% reduction for BOD5, an 8.35% reduction for TN, and a 17.53% reduction for TP at sources contributing to exceedances of the criterion and TMDLs.(4) Lake Munson. The turbidity TMDL is 31 Nephelometric turbidity units (NTUs) and is allocated as follows: (a) The WLA for wastewater point sources is not applicable;(b) The WLA for discharges subject to the Department's NPDES MS4 Permitting Program is to address anthropogenic sources in the basin such that in-lake concentrations meet the TMDL concentration, which, based on the median concentrations from the 1986-2007 period, will require a 31.9% reduction at sources contributing to exceedances; and(c) The LAs for nonpoint sources are to address anthropogenic sources in the basin such that in-lake concentrations meet the TMDL concentration, which, based on the median concentrations from the 1986-2007 period, will require a 31.9% reduction at sources contributing to exceedances of the TMDL.(5) Lake Munson. The DO and nutrient TMDLs are in-lake concentrations for BOD of 2.00 mg/L, TN of 0.765 mg/L, and TP of 0.044 mg/L and are allocated as follows: (a) The WLA for wastewater sources is not applicable;(b) The WLA for discharges subject to the Department's NPDES MS4 Permitting Program is to address anthropogenic sources in the basin such that in-lake concentrations meet the DO criterion and the nutrient TMDL concentrations, which, based on the mean concentrations from the 2004-2008 period, will require a 50% reduction for BOD, a 32.5% reduction for TN, and a 76.7% reduction for TP at sources contributing to exceedances; and(c) The LAs for nonpoint sources are to address anthropogenic sources in the basin such that in-lake concentrations meet the DO criterion and the TMDL concentrations, which, based on the mean concentrations from the 2004-2008 period, will require a 50% reduction for BOD, a 32.5% reduction for TN, and a 76.7% reduction for TP at sources contributing to exceedances of the criterion and BOD and nutrients TMDL concentrations.(6) Munson Slough Below Lake Munson. The DO TMDL is an in-stream concentration for BOD of 2.00 mg/L and is allocated as follows: (a) The WLA for wastewater point sources is not applicable;(b) The WLA for discharges subject to the Department's NPDES MS4 Permitting Program is to address anthropogenic sources in the basin such that in-stream concentrations meet the DO criterion and BOD TMDL concentration, which, based on the mean concentration from the period 1986-2007, will require a 52.9% reduction for BOD at sources contributing to exceedances; and(c) The LAs for nonpoint sources are to address anthropogenic sources in the basin such that in-stream concentrations meet the DO criterion and the BOD TMDL concentration, which, based on the mean concentrations from the 1986-2007 period, will require a 52.9% reduction for BOD at sources contributing to exceedances of the criteria.(7) Munson Slough Below Lake Munson. The un-ionized ammonia impairment is addressed by reductions in total ammonia. The total ammonia TMDL is an in-stream concentration of 0.32 mg/L and is allocated as follows:(a) The WLA for wastewater point sources is not applicable;(b) The WLA for discharges subject to the Department's NPDES MS4 Permitting Program is to address anthropogenic sources in the basin such that in-stream un-ionized ammonia concentrations meet the water quality criterion, which, based on the mean concentration from the period 1971-2007, will require a 33.3% reduction of total ammonia at sources contributing to exceedances; and(c) The LAs for nonpoint sources are to address anthropogenic sources in the basin such that in-stream un-ionized ammonia concentrations meet the water quality criterion, which, based on the mean concentrations from the 1971-2007 period, will require a 33.3% reduction of total ammonia at sources contributing to exceedances.Fla. Admin. Code Ann. R. 62-304.300
Rulemaking Authority 403.061, 403.067 FS. Law Implemented 403.061, 403.062, 403.067 FS.
New 10-21-08, Amended 3-22-12, 6-7-13, Amended by Florida Register Volume 47, Number 081, April 27, 2021 effective 5/9/2021.