62-304.805. Charlotte Harbor Basin TMDLs  


Effective on Sunday, May 9, 2021
  • 1(1) Coral Creek – East Branch. The TMDLs to address the low DO condition for Coral Creek – East Branch are 0.74 mg/L TN, 0.044 mg/L TP, and 2.0 mg/L five-day BOD, and are allocated as follows:

    38(a) The WLA for wastewater sources is not applicable;

    47(b) The WLA for discharges subject to the Department’s NPDES MS4 Permitting Program to address anthropogenic sources in the basin such that in-stream concentrations meet the DO criteria, based on the measured concentrations from the January 2007 to December 2007 period, will require a 31% reduction of TN, a 36% reduction of TP, and a 33% reduction of BOD at sources contributing to exceedances of the criteria; and

    115(c) The LA for nonpoint sources is to address anthropogenic sources in the basin such that in-stream concentrations meet the DO criteria which, based on the measured concentrations from the January 2007 to December 2007 period, will require a 31% reduction of TN, a 36% reduction of TP, and a 33% reduction of BOD at sources contributing to exceedances of the criteria.

    177(2) Gottfried Creek. The bacteriological TMDL for Gottfried Creek is 400 counts/100mL for fecal coliform, and is allocated as follows:

    197(a) The WLA for wastewater sources is not applicable;

    206(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 2005 to 2008 period, will require a 74% reduction of sources contributing to exceedances of the criteria; and

    262(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 2005 to 2008 period, will require a 74% reduction of sources contributing to exceedances of the criteria.

    310(3) North Prong of Alligator Creek. The bacteriological TMDL for the North Prong of Alligator Creek is 400 counts/100mL for fecal coliform, and is allocated as follows:

    337(a) The WLA for wastewater sources is not applicable;

    346(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 2005 and 2007 period, will require a 72% reduction of sources contributing to exceedances of the criteria; and

    402(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 2005 and 2007 period, will require a 72% reduction of sources contributing to exceedances of the criteria.

    450(4) Sanibel Slough West. The nutrient TMDL for Sanibel Slough West is a three-year average of annual loads of 1,903 kilograms per year (kg/year) TN and 241 kg/year TP, which are intended to achieve an AGM chlorophyll 488a 489concentration of 11 µg/L not to be exceed more than once in any consecutive three-year period, and is allocated as follows:

    510(a) The WLA for wastewater point sources is not applicable;

    520(b) The WLA for discharges subject to the Department’s NPDES MS4 Permitting Program is a 26% reduction of TN and a 34% reduction of TP from the 2007-2013 period; and

    550(c) The LA for nonpoint sources is a 26% reduction of TN and a 34% reduction of TP based on average loads from the 2007-2013 period.

    576(5) Sanibel Slough East. The nutrient TMDL for Sanibel Slough East is a three-year average of annual loads of 1,091 kg/year TN and 123 kg/year TP, which are intended to achieve an AGM chlorophyll 611a 612concentration of 21 µg/L not to be exceed more than once in any consecutive three-year period, and is allocated as follows:

    633(a) The WLA for wastewater point sources is not applicable;

    643(b) The WLA for discharges subject to the Department’s NPDES MS4 Permitting Program is a 54% reduction of TN and a 74% reduction of TP based on average loads from the 2007-2013 period; and

    677(c) The LA for nonpoint sources is a 54% reduction of TN and a 74% reduction of TP based on average loads from the 2007-2013 period.

    703Rulemaking Authority 705403.061, 706403.067 FS. 708Law Implemented 710403.061, 711403.062, 712403.067 FS. 714History–New 10-15-09, Amended 8-26-10, 10-18-17, 5-9-21.