Water Quality Assessment Report - Florida Department of ...

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18 Water Quality Assessment Report: Springs Coast Assessment by Planning Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Crystal River/Kings Bay Planning Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Water Quality Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Permitted Discharges and Land Uses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Ecological Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Homosassa River Planning Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Water Quality Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Permitted Discharges and Land Uses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Ecological Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 Chassahowitzka River Planning Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 Water Quality Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 Permitted Discharges and Land Uses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 Ecological Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Middle Coastal Planning Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Water Quality Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Permitted Discharges and Land Uses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 Ecological Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 Anclote River/Coastal Pinellas County Planning Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 81 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 Water Quality Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 Permitted Discharges and Land Uses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 Ecological Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 Chapter 4: Evaluation of Ground Water and Geologic Influences on Impaired Waterbodies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 Geology, Soil, and Ground Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 Ground Water and Springs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 Nutrients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 Dissolved Oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 Evaluations by Planning Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 Overview of Ground Water and Spring Water Quality . . . . . . . . . . . . . . . . . . . . . . . 100 Crystal River/Kings Bay Planning Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 Homosassa River Planning Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 Chassahowitzka Planning Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 Middle Coastal Planning Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 Anclote River/Coastal Pinellas County Planning Unit . . . . . . . . . . . . . . . . . . . . . . . . 111 Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 Chapter 5: The Verified List of Impaired Waters . . . . . . . . . . . . . . . .117 Public Participation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 Identification of Impaired Waters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 Documentation of Reasonable Assurance . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 The Verified List of Impaired Waters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 Pollutants Causing Impairments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 Listing Based on Other Information Indicating Nutrient Imbalance . . . . . . . . . . . . . 137 Adoption Process for the Verified List of Impaired Waters . . . . . . . . . . . . . . . . . . . . 139 Chapter 6: TMDL Development, Allocation, and Implementation . . .141 Prioritization of Listed Waters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141 Total Maximum Daily Load Development . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 Total Maximum Daily Load Allocation and Implementation . . . . . . . . . . . . . 147 Initial Allocation of Pollutant Loadings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 Implementation Programs and Approaches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 Development of Basin Management Action Plans . . . . . . . . . . . . . . . . . . . . . 149
Tables Table 1.1: Stakeholder Involvement in the TMDL Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Table 2.1: 1995 Land Use and Land Cover in the Springs Coast Basin . . . . . . . . . . . . . . . . . . . . . . . 31 Table 2.2: Citrus, Hernando, Pasco, and Pinellas County Population, 1980–2020 . . . . . . . . . . . . . . . 32 Table 2.3: 1999 Priority List and Schedule for MFLs in the Springs Coast Basin . . . . . . . . . . . . . . . . 40 Table 2.4: Citrus County Water Use (mgd) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Table 2.5: Hernando County Water Use (mgd) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Table 2.6: Pasco County Water Use (mgd) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Table 2.7: Pinellas County Water Use (mgd) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Table 3.1: Summary of Data Providers in the Springs Coast Basin . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Table 3.2: Designated Use Attainment Categories for Surface Waters in Florida . . . . . . . . . . . . . . . 59 Table 3.3: Categories for Waterbodies or Waterbody Segments in the Integrated Report . . . . . . . . 60 Table 3.4: Planning Units in the Springs Coast Basin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Table 3.5: Integrated Water Quality Assessment Summary for the Crystal River/Kings Bay Planning Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 Table 3.6: Integrated Water Quality Assessment Summary for the Homosassa River Planning Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Table 3.7: Integrated Water Quality Assessment Summary for the Chassahowitzka River Planning Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Table 3.8: Integrated Water Quality Assessment Summary for the Middle Coastal Planning Unit . . . 77 Table 3.9: Integrated Water Quality Assessment Summary for the Anclote River/Coastal Pinellas County Planning Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Table 4.1: Ground Water Statistics for Planning Units in the Springs Coast Basin . . . . . . . . . . . . . 100 Table 4.2: Springs Statistics for Planning Units in the Springs Coast Basin . . . . . . . . . . . . . . . . . . 100 Table 5.1: Schedule for Development and Adoption of the Group 5 Verifi ed Lists . . . . . . . . . . . . . . .118 Table 5.2: Elements of Reasonable Assurance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119 Table 5.3: The Verifi ed List of Impaired Waters for the Springs Coast Basin . . . . . . . . . . . . . . . . . . 120 Table 5.4: Parameters Causing Potential Impairments in the Springs Coast Basin . . . . . . . . . . . . . 135 Table 5.5: Screening Level Values (70th Percentile) Based on STORET Data from 1970–87 . . . . . . 136 Table 5.6: Springs Coast Basin Median Values for the Verifi ed Period . . . . . . . . . . . . . . . . . . . . . . 137 Table 5.7: Springs Coast Basin Nitrogen to Phosphorus Ratios for the Verifi ed Period . . . . . . . . . . 138 Table 6.1: Priorities for TMDL Development in the Springs Coast Basin . . . . . . . . . . . . . . . . . . . . . 143 Table 6.2: Municipal NPDES Stormwater (Phase 1) Permittees in the Springs Coast Basin . . . . . . 148 Figures Water Quality Assessment Report: Springs Coast References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .151 Appendices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .159 Figure 1.1: Schedule for Implementing the Watershed Management Cycle in the Department’s Southwest District, Basin Groups 1 through 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 2.1: Geopolitical Map of the Springs Coast Basin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Figure 2.2: Surface Water Resources of the Springs Coast Basin . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Figure 2.3: Ground Water Usage and Known Contaminant Sources in the Springs Coast Basin . . . . . 48 Figure 3.1: Sources of Data for the Springs Coast Basin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Figure 3.2: Locations and Boundaries of Planning Units in the Springs Coast Basin . . . . . . . . . . . . . . 63 Figure 3.3: Composite Map of the Crystal River/Kings Bay Planning Unit, Including the 1998 303(d) List, Planning List and Verifi ed List Waters, and Potential Pollution Sources . . . . . 64 19
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Page 5 and 6: Acknowledgments The Springs Coast W
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Pollutants Causing Impairments Of t
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• WBID 1668B, nitrogen and phosph
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