2021 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.
(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.