Water Quality Assessment Report - Florida Department of ...

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20 Water Quality Assessment Report: Springs Coast Figure 3.4: Composite Map of the Homosassa River Planning Unit, Including the 1998 303(d) List, Planning List and Verifi ed List Waters, and Potential Pollution Sources . . . . . . . . . . . 67 Figure 3.5: Composite Map of the Chassahowitzka River Planning Unit, Including the 1998 303(d) List, Planning List and Verifi ed List Waters, and Potential Pollution Sources . . . . . 71 Figure 3.6: Composite Map of the Middle Coastal Planning Unit, Including the 1998 303(d) List, Planning List and Verifi ed List Waters, and Potential Pollution Sources . . . . . . . . . . . . . . 75 Figure 3.7: Composite Map of the Anclote River/Coastal Pinellas County Planning Unit, Including the 1998 303(d) List, Planning List and Verifi ed List Waters, and Potential Pollution Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 Figure 4.1: Dissolved nitrate+nitrite concentrations in the Floridan aquifer system and springs compared with major springsheds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 Figure 4.2: Dissolved orthophosphate concentrations in the Floridan aquifer system and springs compared with major springsheds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 Figure 4.3: Recent trends for dissolved nitrate+nitrite and dissolved orthophosphate concentrations measured from two major Kings Bay springs . . . . . . . . . . . . . . . . . . . . . 104 Figure 4.4: Recent trends for dissolved nitrate+nitrite and dissolved orthophosphate concentrations measured from three of the largest springs of the Homosassa Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 Figure 4.5: Recent trends for dissolved nitrate+nitrite and dissolved orthophosphate concentrations measured from Chassahowitzka Main and No. 1 springs . . . . . . . . . . . . 108 Figure 4.6: Relationship between nitrate trends in Weeki Wachee Springs and population trends in Hernando County. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110 Figure 4.7: Residential land use south and east of Weeki Wachee Springs, Hernando County, Florida. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .111 Figure 5.1: Waters on the Verifi ed List, with Projected Year for TMDL Development . . . . . . . . . . . . 134
Chapter 1: Introduction Purposes and Content of the Assessment Report The Florida Department of Environmental Protection (Department) is implementing a statewide watershed management approach for restoring and protecting water quality and addressing Total Maximum Daily Load (TMDL) Program requirements. Under Section 303(d) of the 1972 federal Clean Water Act and the 1999 Florida Watershed Restoration Act (FWRA) (Chapter 99-223, Laws of Florida), TMDLs must be developed for all waters that do not meet their designated uses (such as drinking water, recreation, and shellfi sh harvesting) and are thus defi ned as impaired. TMDLs will be developed, and the corresponding reductions in pollutant loads allocated, as part of the watershed management approach, which rotates through the state’s 52 river basins over a 5-year cycle. Extensive public participation from diverse stakeholders in each of these basins is crucial in all phases of the cycle. A Status Report published during Phase 1 of the watershed management cycle provided a Planning List, or preliminary identifi cation, of potentially impaired waterbodies in the Springs Coast Basin. A copy of the report can be found at http://www.dep.state.fl .us/water/tmdl/stat_rep.htm (under the Group 5 basins). This Assessment Report, which updates the information in the Status Report, incorporates data collected from the Department’s strategic monitoring and gathered from other agencies and groups during Phase 2 of the watershed cycle. The report contains a Verifi ed List of impaired waters required by the FWRA and Section 303(d) of the federal Clean Water Act, for which TMDLs must be developed and implemented. It also describes the results of a preliminary ground water quality assessment and discusses priorities for further evaluation, as well as resource priorities and proposed actions. (See Noteworthy for a description of the contents of the Assessment Report, by chapter.) Based on the assessment results, 57 waterbodies or waterbody segments in the Springs Coast Basin are verifi ed impaired for 1 or more parameters. TMDLs must be developed for these waters, unless the impairment is documented to be a naturally occurring condition that a TMDL cannot abate, or unless a management plan is already in place to correct the problem. This report is intended for distribution to a broad range of potential stakeholders, including decision makers in federal, state, regional, tribal, and local governments; public and private interests; and citizens. The Verifi ed List is required by Subsection 403.067(4), Florida Statutes, and Section 303(d) of the federal Clean Water Act. The Department has adopted the Verifi ed List of impaired waters in accordance Water Quality Assessment Report: Springs Coast Total Maximum Daily Load The maximum amount of a given pollutant that a waterbody can assimilate and remain healthy, such that all of its designated uses are met. 21
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