Florida Regulations 62-304.640: Withlacoochee River Basin TMDLs
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(1) Rainbow Springs Group and Rainbow Springs Group Run. The nitrate-nitrite TMDL 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 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 2000-2010 period, will require a 82% reduction of nitrate-nitrite; 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 2000-2011 period, will require a 82% reduction of nitrate-nitrite.
(2) Lake Juliana. The nutrient TMDL for Lake Juliana is an AGM of 1.03 mg/L TN, which is intended to achieve the applicable AGM chlorophyll a criterion for low color, high alkalinity lakes, 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 a 40% reduction of TN based on mean concentrations from the 2003-2013 period; and
(c) The LA for nonpoint sources is a 40% reduction of TN based on mean concentrations from the 2003-2013 period.
(3) Gum Springs (Alligator Springs). The nutrient TMDL for Gum Springs (Alligator Springs) is an AGM of 0.35 mg/L nitrate-nitrite at the spring vent, 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 a 78% reduction of nitrate-nitrite (calculated from 1.58 mg/L), which is based on the highest AGM concentration from the 2009 – 2017 period; and
(c) The LA for nonpoint sources is 78% reduction of nitrate-nitrite (calculated from 1.58 mg/L), which is based on the highest AGM from the 2009 — 2017 period.
(4) Wilson Head Spring. The nutrient TMDL for Wilson Head Spring is an AGM of 0.35 mg/L nitrate-nitrite at the spring vent, 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 a 43% reduction of nitrate-nitrite (calculated from 0.61 mg/L), which is based on the highest AGM concentration from the 2009 – 2017 period; and
(c) The LA for nonpoint sources is 43% reduction of nitrate-nitrite (calculated from 0.61 mg/L), which is based on the highest AGM from the 2009 — 2017 period.
(5) Blue Spring (Citrus County). The nutrient TMDL for Blue Spring (Citrus County) is an AGM of 0.35 mg/L nitrate-nitrite at the spring vent, 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 a 61% reduction of nitrate-nitrite (calculated from 0.90 mg/L), which is based on the highest AGM concentration from the 2009 – 2017 period; and
(c) The LA for nonpoint sources is 61% reduction of nitrate-nitrite (calculated from 0.90 mg/L), which is based on the highest AGM from the 2009 — 2017 period.
(6) Lake Agnes. The nutrient TMDL for Lake Agnes is a seven-year average of annual loads of 10,896 lbs/year TN and 618 lbs/year TP, which are intended to achieve the applicable chlorophyll a criterion for low color and low alkalinity lakes, 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 a 41% reduction of TN (calculated from 18,552 lbs/year) and a 69% reduction of TP (calculated from 1,979 lbs/year) from the 2000-2016 period; and
(c) The LA for nonpoint sources is a 41% reduction of TN (calculated from 18,552 lbs/year) and a 69% reduction of TP (calculated from 1,979 lbs/year) based on average loads from the 2000-2016 period.
Rulemaking Authority 403.061, 403.067 FS. Law Implemented 403.061, 403.062, 403.067 FS. History-New 5-7-13, Amended 12-11-16, 10-29-19, 1-30-20, 5-9-21.
(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 nitrate-nitrite concentrations meet the TMDL target, which, based on the mean concentrations from the 2000-2010 period, will require a 82% reduction of nitrate-nitrite; 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 2000-2011 period, will require a 82% reduction of nitrate-nitrite.
(2) Lake Juliana. The nutrient TMDL for Lake Juliana is an AGM of 1.03 mg/L TN, which is intended to achieve the applicable AGM chlorophyll a criterion for low color, high alkalinity lakes, 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 a 40% reduction of TN based on mean concentrations from the 2003-2013 period; and
(c) The LA for nonpoint sources is a 40% reduction of TN based on mean concentrations from the 2003-2013 period.
(3) Gum Springs (Alligator Springs). The nutrient TMDL for Gum Springs (Alligator Springs) is an AGM of 0.35 mg/L nitrate-nitrite at the spring vent, 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 a 78% reduction of nitrate-nitrite (calculated from 1.58 mg/L), which is based on the highest AGM concentration from the 2009 – 2017 period; and
(c) The LA for nonpoint sources is 78% reduction of nitrate-nitrite (calculated from 1.58 mg/L), which is based on the highest AGM from the 2009 — 2017 period.
(4) Wilson Head Spring. The nutrient TMDL for Wilson Head Spring is an AGM of 0.35 mg/L nitrate-nitrite at the spring vent, 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 a 43% reduction of nitrate-nitrite (calculated from 0.61 mg/L), which is based on the highest AGM concentration from the 2009 – 2017 period; and
(c) The LA for nonpoint sources is 43% reduction of nitrate-nitrite (calculated from 0.61 mg/L), which is based on the highest AGM from the 2009 — 2017 period.
(5) Blue Spring (Citrus County). The nutrient TMDL for Blue Spring (Citrus County) is an AGM of 0.35 mg/L nitrate-nitrite at the spring vent, 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 a 61% reduction of nitrate-nitrite (calculated from 0.90 mg/L), which is based on the highest AGM concentration from the 2009 – 2017 period; and
(c) The LA for nonpoint sources is 61% reduction of nitrate-nitrite (calculated from 0.90 mg/L), which is based on the highest AGM from the 2009 — 2017 period.
(6) Lake Agnes. The nutrient TMDL for Lake Agnes is a seven-year average of annual loads of 10,896 lbs/year TN and 618 lbs/year TP, which are intended to achieve the applicable chlorophyll a criterion for low color and low alkalinity lakes, 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 a 41% reduction of TN (calculated from 18,552 lbs/year) and a 69% reduction of TP (calculated from 1,979 lbs/year) from the 2000-2016 period; and
(c) The LA for nonpoint sources is a 41% reduction of TN (calculated from 18,552 lbs/year) and a 69% reduction of TP (calculated from 1,979 lbs/year) based on average loads from the 2000-2016 period.
Rulemaking Authority 403.061, 403.067 FS. Law Implemented 403.061, 403.062, 403.067 FS. History-New 5-7-13, Amended 12-11-16, 10-29-19, 1-30-20, 5-9-21.