Tampa Bay Basin TMDLs  

  •  

    DEPARTMENT OF ENVIRONMENTAL PROTECTION

    RULE NO.: RULE TITLE:
    62-304.600: Tampa Bay Basin TMDLs

    NOTICE OF CHANGE

    Notice is hereby given that the following changes have been made to the proposed rule in accordance with subparagraph 120.54(3)(d)1., F.S., published in Vol. 35, No. 31, August 7, 2009 issue of the Florida Administrative Weekly.

    Please note, a previous Notice of Change was published for this rule in the Vol. 36, No. 7, February 19, 2010 issue and the Vol. 36, No. 17, April 30, 2010 issue of the Florida Administrative Weekly.

     

    THE FULL TEXT OF THE PROPOSED RULE IS:

    62-304.600 Tampa Bay Basin TMDLs.

    (2) Allen Creek (Tidal). The TMDL to address the low dissolved oxygen and nutrient impairments in Allen Creek (Tidal) is an annual average 0.97 mg/L of total nitrogen (TN), 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 Municipal Stormwater Permitting Program is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 24.8 percent reduction of TN at sources contributing to exceedances of the criteria.

    (c) The LA for nonpoint sources is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 24.8 percent reduction of TN at sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the LA and WLA for TN have been expressed as the percent reductions needed to attain the applicable Class III criteria, it is the combined reductions from both anthropogenic point and nonpoint sources that will result in the required reduction of in-stream TN concentration. However, it is not the intent of the TMDL to abate natural background conditions.

    (4) Alligator Creek. The TMDL to address the low dissolved oxygen and nutrient impairments in Alligator Creek is an annual average for TN of 0.87 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 Municipal Stormwater Permitting Program is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 28.0 percent reduction of TN at sources contributing to exceedances of the criteria.

    (c) The LA for nonpoint sources is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 28.0 percent reduction of TN at sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the LA and WLA for TN has been expressed as the percent reduction needed to attain the applicable Class III criteria, it is the combined reductions from both anthropogenic point and nonpoint sources that will result in the required reduction of in-stream TN concentrations. However, it is not the intent of the TMDL to abate natural background conditions.

    (5) Alligator Lake. The TMDLs to address the low dissolved oxygen and nutrient impairments in Alligator Lake are an annual average of 0.72 mg/L for TN and an annual average 5-day biochemical oxygen demand (BOD5), and are allocated as follows:

    (a) The WLA for wastewater sources is not applicable,

    (b) The WLAs for discharges subject to the Department’s NPDES Municipal Stormwater Permitting Program are to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 32.7 percent reduction and 75.0 percent reduction of TN and BOD5, respectively, at sources contributing to exceedances of the criteria.

    (c) The LAs for nonpoint sources are to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 32.7 percent reduction and 75.0 percent reduction for TN and BOD5, respectively, of sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the LA and WLA for TN and BOD5 have been expressed as the percent reductions needed to attain the applicable Class III criteria, it is the combined reductions from both anthropogenic point and nonpoint sources that will result in the required reduction of in-stream TN and BOD5 concentrations. However, it is not the intent of the TMDL to abate natural background conditions.

    (7) Bellows Lake Outlet (also known as East Lake Outfall). The TMDLs to address the low dissolved oxygen and nutrient impairments in Bellows Lake Outlet are an annual average TN of 1.16 mg/L and BOD5 of 2.00 mg/L, and are allocated as follows:

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

    (b) The WLAs for discharges subject to the Department’s Municipal Stormwater Permitting Program are to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on the measured concentrations in the 2005 -2006 period, will require a 42.4 percent reduction of TN and a 63.3 percent reduction of BOD5 at sources that are contributing to exceedances of the criteria.

    (c) The LAs for nonpoint sources is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on the measured concentrations in the 2005 -2006 period, will require a 42.4 percent reduction of TN and a 63.3 percent reduction of BOD5 of sources that are contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the WLA and LA have been expressed as the percent reductions needed to attain the applicable Class III criteria, it is the reductions from anthropogenic sources that will result in the required reduction of nutrients and BOD5. However, it is not the intent of the TMDL to abate natural background conditions.

    (18)(8) Bellows Lake (also known as East Lake). The TMDLs to address the low dissolved oxygen (addresses downstream impairment) and nutrient impairments are an annual average TN of 1.40 mg/L, an annual average TP of 0.055 mg/L, and an annual average BOD5 of 2.00 mg/L and are allocated as follows:

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

    (b) The WLAs for discharges subject to the Department’s NPDES Municipal Stormwater Permitting Program are to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on the measured concentrations in the 2005 -2006 period, will require a 30.5 percent reduction of TN, a 33.3 percent reduction in TP, and a 63.3 percent reduction of BOD5 at sources that are contributing to exceedances of the criteria.

    (c) The LAs for nonpoint sources are to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on the measured concentrations in the 2005 -2006 period, will require a 30.5 percent reduction of TN, a 33.3 percent reduction in TP, and a 63.3 percent reduction in BOD5 of sources that are contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the WLA and LA have been expressed as the percent reductions needed to attain the applicable Class III criteria, it is the reductions from anthropogenic sources that will result in the required reduction of nutrients and BOD5. However, it is not the intent of the TMDL to abate natural background conditions.

    (11) Bishop Creek (Tidal). The TMDL to address the low dissolved oxygen impairments in Bishop Creek (Tidal) is an annual average 0.97 mg/L of TN 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 Municipal Stormwater Permitting Program is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 12.6 percent reduction of TN at sources contributing to exceedances of the criteria.

    (c) The LA for nonpoint sources is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 12.6 percent reduction of TN at sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the LA and WLA for TN have been expressed as the percent reductions needed to attain the applicable Class III criteria, it is the combined reductions from both anthropogenic point and nonpoint sources that will result in the required reduction of in-stream TN concentration. However, it is not the intent of the TMDL to abate natural background conditions.

    (13) Brushy Creek. The TMDL to address the low dissolved oxygen impairment in Brushy Creek is an annual average 0.87 mg/L of TN and is allocated as follows:

    (a) The WLA for the Hillsborough County Dale Mabry Advanced Wastewater Treatment Plant (FL0036820) is a five-year rolling annual average of 16,000 lbs/year of TN.

    (b) The WLA for discharges subject to the Department’s NPDES Municipal Stormwater Permitting Program is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 16.3 percent reduction of TN at sources contributing to exceedances of the criteria.

    (c) The LA for nonpoint sources is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 16.3 percent reduction of TN at sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the LA and WLA for TN has been expressed as the percent reductions needed to attain the applicable Class III criteria, it is the combined reductions from both anthropogenic point and nonpoint sources that will result in the required reduction of in-stream TN concentration. However, it is not the intent of the TMDL to abate natural background conditions.

    (16) Bullfrog Creek (tidal). The TMDL to address the low dissolved oxygen and nutrients in Bullfrog Creek (tidal) is an annual average TN concentration of 0.80 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 Municipal Stormwater Permitting Program is to address anthropogenic sources in the basin such that in-stream concentrations meet the Class III marine dissolved oxygen and nutrient criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 45.6 percent reduction of TN at sources contributing to exceedances of the criteria.

    (c) The LA for nonpoint sources is to address anthropogenic sources in the basin such that in-stream concentrations meet the Class III marine dissolved oxygen and nutrient criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 45.6 percent reduction of TN at sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the LA and WLA for TN have been expressed as the percent reductions needed to attain the applicable Class III criteria, it is the combined reductions from both anthropogenic point and nonpoint sources that will result in the required reduction of in-stream TN concentration. However, it is not the intent of the TMDL to abate natural background conditions.

    (17) Cockroach Bay. The TMDLs to address the low dissolved oxygen and nutrient impairments are an annual average of 1.04 mg/L for TN and an annual average 2.0 mg/L for for BOD5, respectively, and are allocated as follows:

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

    (b) The WLAs for discharges subject to the Department’s NPDES Municipal Stormwater Permitting Program are to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on measured concentrations from year 2000 to 2007, will require a 34.1 percent reduction in current anthropogenic loadings of TN and a 50.6 percent reduction in current anthropogenic loadings of BOD5 of sources contributing to exceedances of the criteria.

    (c) The LA for nonpoint sources are to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on measured concentrations from year 2000 to 2007, will require a 34.1 percent reduction of TN and a 50.6 percent reduction of BOD5 of sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the WLA and LA have been expressed as the percent reductions needed to attain the applicable Class II criteria, it is the reductions from anthropogenic sources that will result in the required reduction of nutrients and BOD5. However, it is not the intent of the TMDL to abate natural background conditions.

    (18) Coffee Pot Bayou. The TMDL to address the low dissolved oxygen and nutrient impairments are an annual average of 0.97 mg/L and 2.00 mg/L for TN and BOD5, respectively, and are allocated as follows:

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

    (b) The WLAs for discharges subject to the Department’s NPDES Municipal Stormwater Permitting Program are to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on measured concentrations from the 2000 to 2007 period, will require a 16.4 percent reduction of TN and a 42.9 percent reduction of BOD5 of sources contributing to exceedances of the criteria.

    (c) The LAs for nonpoint sources are to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on measured concentrations from the 2000 to 2007 period, will require a 16.4 percent reduction of TN and a 42.9 percent reduction of BOD5 of sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the WLA and LA have been expressed as the percent reductions needed to attain the applicable Class II criteria, it is the reductions from anthropogenic sources that will result in the required reduction of nutrients and BOD5. However, it is not the intent of the TMDL to abate natural background conditions.

    (20) Cross Canal (North). The TMDL to address the low dissolved oxygen impairment in Cross Canal (North) is an annual average 0.97 mg/L of TN 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 Municipal Stormwater Permitting Program is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 41.6 percent reduction of sources contributing to exceedances of the criteria.

    (c) The LA for nonpoint sources is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 41.6 percent reduction of sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the LA and WLA for TN have been expressed as the percent reductions needed to attain the applicable Class III criteria, it is the combined reductions from both anthropogenic point and nonpoint sources that will result in the required reduction of in-stream TN concentration. However, it is not the intent of the TMDL to abate natural background conditions.

    (22) Double branch. The TMDL to address the low dissolved oxygen and nutrient impairments in Double Branch is an annual average 0.97 mg/L of TN 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 Municipal Stormwater Permitting Program is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 26.0 percent reduction of TN at sources contributing to exceedances of the criteria.

    (c) The LA for nonpoint sources is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 26.0 percent reduction of TN at sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the LA and WLA for TN have been expressed as the percent reductions needed to attain the applicable Class III criteria, it is the combined reductions from both anthropogenic point and nonpoint sources that will result in the required reduction of in-stream TN concentration. However, it is not the intent of the TMDL to abate natural background conditions.

    (23) Lake Tarpon Canal (Freshwater). The TMDL to address the low dissolved oxygen and nutrient impairments in Lake Tarpon Canal (Freshwater) is an annual average 0.87 mg/L of TN 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 Municipal Stormwater Permitting Program is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrients criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 25.6 percent reduction of TN at sources contributing to exceedances of the criteria.

    (c) The LA for nonpoint sources is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrients criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 25.6 percent reduction of TN at sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the LA and WLA for TN have been expressed as the percent reductions needed to attain the applicable Class III criteria, it is the combined reductions from both anthropogenic point and nonpoint sources that will result in the required reduction of in-stream TN concentration. However, it is not the intent of the TMDL to abate natural background conditions.

    (24) Lake Tarpon Canal (Marine). The TMDLs to address the low dissolved oxygen and nutrient impairments in Lake Tarpon Canal (Marine) is an annual average 0.97 mg/L of TN and is allocated as follows:

    (a) The WLA for wastewater sources is not applicable,

    (b) The WLAs for discharges subject to the Department’s NPDES Municipal Stormwater Permitting Program are to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 12.6 percent reduction of TN of sources contributing to exceedances of the criteria.

    (d) The Margin of Safety is implicit.(c) The LA for nonpoint sources is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 12.6 percent reduction of TN of sources contributing to exceedances of the criteria, and

    (e) While the LA and WLA for TN and TP have been expressed as the percent reductions needed to attain the applicable Class III criteria, it is the combined reductions from both anthropogenic point and nonpoint sources that will result in the required reduction of in-stream TN and TP concentrations. However, it is not the intent of the TMDL to abate natural background conditions.

    (27) Lower Rocky Creek. The TMDL to address the low dissolved oxygen and nutrient impairments in Lower Rocky Creek is an annual average 0.97 mg/L of TN 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 Municipal Stormwater Permitting Program is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 41.2 percent reduction of TN at sources contributing to exceedances of the criteria.

    (c) The LA for nonpoint sources is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 41.2 percent reduction of TN at sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the LA and WLA for TN have been expressed as the percent reductions needed to attain the applicable Class III criteria, it is the combined reductions from both anthropogenic point and nonpoint sources that will result in the required reduction of in-stream TN concentration. However, it is not the intent of the TMDL to abate natural background conditions.

    (29) Moccasin Creek. The TMDL to address the low dissolved oxygen and nutrient impairments in Moccasin Creek is an annual average 0.97 mg/L of TN and is allocated as follows:

    (a) The WLA for wastewater sources is not applicable,

    (b) The WLAs for discharges subject to the Department’s NPDES Municipal Stormwater Permitting Program are to address anthropogenic sources in the basin such that in778-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 39.4 percent reduction of TN of sources contributing to exceedances of the criteria,

    (c) The LA for nonpoint sources is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 39.4 percent reduction of TN of sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the LA and WLA for TN and TP have been expressed as the percent reductions needed to attain the applicable Class III criteria, it is the combined reductions from both anthropogenic point and nonpoint sources that will result in the required reduction of in-stream TN and TP concentration. However, it is not the intent of the TMDL to abate natural background conditions.

    (32) Mullet Creek (Tidal). The TMDL to address the low dissolved oxygen impairment in Mullet Creek Tidal is an annual average 0.97 mg/L of TN 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 Municipal Stormwater Permitting Program is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 18.5 percent reduction of TN at sources contributing to exceedances of the criteria.

    (c) The LA for nonpoint sources is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 18.5 percent reduction of TN at sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the LA and WLA for TN have been expressed as the percent reductions needed to attain the applicable Class III criteria, it is the combined reductions from both anthropogenic point and nonpoint sources that will result in the required reduction of in-stream TN concentration. However, it is not the intent of the TMDL to abate natural background conditions.

    (34) Smacks Bayou. The fecal coliform TMDL for Smacks Bayou is 43 counts/100mL, 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 Municipal Stormwater 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 1995 to 1996 period, will require a 94 percent reduction at sources contributing to exceedances of the criteria,

    (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 1995 to 1996 period, will require a 94 percent reduction of sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the LA and WLA for fecal coliform have been expressed as the percent reductions needed to attain the applicable Class III criteria, it is the combined reductions from both anthropogenic point and nonpoint sources that will result in the required reduction of in-stream fecal concentration. However, it is not the intent of the TMDL to abate natural background conditions.

    (35) Smacks Bayou. The TMDLs to address the low dissolved oxygen and nutrient impairments are an annual average of 0.97 mg/L and an annual average of 2.00 mg/L for TN and BOD5, respectively. These TMDLs are applicable to sources in the 45th Avenue Northeast Canal subbasin and the 54th Avenue East Canal subbasin within the Smacks Bayou watershed and are allocated as follows:

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

    (b) The WLAs for discharges subject to the Department’s NPDES Municipal Stormwater Permitting Program are to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on measured concentrations in the canals from the 2000 to 2007 period, will require a 32.2 percent reduction of TN and a 33.3 percent reduction of BOD5 at sources contributing to exceedances of the criteria.

    (c) The LAs for nonpoint sources are to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen and nutrient criteria which, based on measured concentrations in the canals from the 2000 to 2007 period, will require a 32.2 percent reduction of TN and a 33.3 percent reduction of BOD5 at sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the WLA and LA have been expressed as the percent reductions needed to attain the applicable Class II criteria, it is the reductions from anthropogenic sources that will result in the required reduction of nutrients and BOD5. However, it is not the intent of the TMDL to abate natural background conditions.

    (37) Sweetwater Creek. The TMDL to address the low dissolved oxygen impairment in Sweetwater Creek is an annual average 0.87 mg/L of TN 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 Municipal Stormwater Permitting Program is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 19.4 percent reduction of TN at sources contributing to exceedances of the criteria.

    (c) The LA for nonpoint sources is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 19.4 percent reduction of TN at sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the LA and WLA for TN have been expressed as the percent reductions needed to attain the applicable Class III criteria, it is the combined reductions from both anthropogenic point and nonpoint sources that will result in the required reduction of in-stream TN concentration. However, it is not the intent of the TMDL to abate natural background conditions.

    (38) Tampa Bypass Canal Tributary. The TMDL to address the low dissolved oxygen and nutrient impairments in the Tampa Bypass Canal Tributary is an annual average TN concentration of 1.16 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 Municipal Stormwater Permitting Program is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen criteria which, based on the measured concentrations from the 2000 to 2007 period, will require a 51.9 percent reduction of TN at sources contributing to exceedances of the criteria.

    (c) The LA for nonpoint sources is to address anthropogenic sources in the basin such that in-stream concentrations meet the dissolved oxygen criteria which, based on the measured concentrations from the year 2005, will require a 51.9 percent reduction of TN at sources contributing to exceedances of the criteria, and

    (d) The Margin of Safety is implicit.

    (e) While the LA and WLA for TN and TP have been expressed as the percent reductions needed to attain the applicable Class III criteria, it is the combined reductions from both anthropogenic point and nonpoint sources that will result in the required reduction of in-stream TN and TP concentrations. However, it is not the intent of the TMDL to abate natural background conditions.

    Rulemaking Authority 403.061, 403.067 FS. Law Implemented 403.061, 403.062, 403.067 FS. History–New 11-11-10, Amended________.

Document Information

Related Rules: (1)
62-304.600. Tampa Bay Basin TMDLs