Total Maximum Daily Loads for Fecal Coliform
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Total Maximum Daily Load for Fecal Coliform - Upper Broad River Basin TOTAL MAXIMUM DAILY LOADS FOR FECAL COLIFORM FOR Turkey Creek, Meng Creek, Browns Creek, Gregorys Creek, Dry Fork, Sandy River, Elizabeth Lake, Little River, Winnsboro Branch, Jackson Creek, and Mill Creek watersheds and the lower portion of the Upper Broad River, South Carolina HYDROLOGIC UNIT CODE: 03050106 (B-086, B-136, B-064, B-243, B-155, B-335, B-046, B-074, B-075, B-110, B-316, B-280, B-337, B-145, B-350, B-123, B-077, B-102, B-338) September 2005 SCDHEC Technical Report Number: 028-05 Total Maximum Daily Load for Fecal Coliform - Upper Broad River Basin In compliance with the provisions of the Federal Clean Water Act, 33 U.S.C §1251 et.seq., as amended by the Water Quality Act of 1987, P.L. 400-4, the U.S Environmental Protection Agency is hereby establishing a Total Maximum Daily Load (TMDL) for Fecal Coliform for Turkey Creek, Meng Creek, Browns Creek, Gregorys Creek, Dry Fork, Sandy River, Elizabeth Lake, Little River, Winnsboro Branch, Jackson Creek, Mill Creek, and the lower portion of the Upper Broad River in the Broad River Basin. Subsequent actions must be consistent with this TMDL. James D. Giattina, Director Date Water Management Division Total Maximum Daily Load for Fecal Coliform - Upper Broad River Basin TRN: 028-05 TABLE OF CONTENTS LIST OF FIGURES ......................................................................................................... iii LIST OF TABLES ........................................................................................................... iv ACRONYMS AND ABBREVIATIONS..........................................................................v SECTION 1 INTRODUCTION ................................................................................... 1-1 1.1 Background....................................................................................................... 1-1 1.2 Watershed Description...................................................................................... 1-5 SECTION 2 WATER QUALITY ASSESSMENT ..................................................... 2-1 2.1 Water Quality Standards................................................................................... 2-1 2.2 Assessment of Existing Water Quality Data..................................................... 2-1 2.3 Establishing the Water Quality Target.............................................................. 2-6 SECTION 3 POLLUTANT SOURCE ASSESSMENT ............................................. 3-1 3.1 Point Source Discharges ................................................................................... 3-1 3.1.1 Continuous Point Sources..................................................................... 3-1 3.1.2 Municipal Separate Storm Sewer Systems ........................................... 3-6 3.2 Nonpoint Sources.............................................................................................. 3-9 3.2.1 Wildlife ................................................................................................. 3-9 3.2.2 Agricultural Activities and Domesticated Animals ............................ 3-10 3.2.3 Failing Onsite Wastewater Disposal Systems and Illicit Discharges . 3-16 3.2.4 Domestic Pets......................................................................................3-17 3.3 Summary of Fecal Coliform Sources and WQM Stations on Impaired Streams3-18 3.3.1 Ross Branch and Turkey Creek .......................................................... 3-18 3.3.2 Meng Creek and Tributary, Browns Creek, Gregorys Creek and Broad River.................................................................................................... 3-20 3.3.3 Dry Fork and Sandy River .................................................................. 3-22 3.3.4 Elizabeth Lake at Spillway, Crane Creek, Smith Branch, and Broad River.................................................................................................... 3-23 3.3.5 Little River.......................................................................................... 3-25 3.3.6 Winnsboro Branch, Winnsboro Branch below Outfall, Jackson Creek, and Mill Creek .................................................................................... 3-26 SECTION 4 TECHNICAL APPROACH AND METHODOLOGY........................ 4-1 4.1 Using Load Duration Curves to Develop TMDLs............................................ 4-1 4.2 Explanation of Steps used to Perform TMDL Calculations ............................. 4-1 SECTION 5 TMDL CALCULATIONS ...................................................................... 5-1 5.1 Results of TMDL Calculations ......................................................................... 5-1 5.2 Critical Conditions and Estimated Loading...................................................... 5-1 5.3 Waste Load Allocation ..................................................................................... 5-5 i FINAL September 2005 Total Maximum Daily Load for Fecal Coliform - Upper Broad River Basin TRN: 028-05 5.4 Load Allocation................................................................................................ 5-7 5.5 Seasonal Variability.......................................................................................... 5-7 5.6 Margin of Safety ............................................................................................... 5-7 5.7 TMDL Calculations.......................................................................................... 5-8 SECTION 6 PUBLIC PARTICIPATION................................................................... 6-1 SECTION 7 REFERENCES......................................................................................... 7-1 APPENDICES Appendix A SCDHEC Fecal Coliform Data – 1990 to 2002 Appendix B Plots Comparing Precipitation and Fecal Coliform Concentrations Appendix C NPDES Permit Discharge Monitoring Report Data Appendix D Estimated Flow Exceedance Percentiles Appendix E Load Duration Curves – Estimated Loading and Critical Conditions ii FINAL September 2005 Total Maximum Daily Load for Fecal Coliform - Upper Broad River Basin TRN: 028-05 LIST OF FIGURES Figure 1-1 Turkey Creek, Meng Creek, Browns Creek, Gregory Creek, Sandy Creek, Dry Fork and Broad River Watersheds....................................................... 1-2 Figure 1-2 Elizabeth Lake, Crane Creek, Smith Branch, Broad River, Little River, Winnsboro Branch, Jackson Creek, and Mill Creek Watersheds............... 1-3 Figure 1-3 Broad River Basin: 8- and 11-Digit HUCs................................................ 1-6 Figure 1-4 Land Use Map for: Turkey Creek, Meng Creek, Browns Creek, Gregory Creek, Sandy Creek, Dry Fork and Broad River Watersheds .................. 1-14 Figure 1-5 Land Use Map for: Elizabeth Lake, Crane Creek, Smith Branch, Broad River, Little River, Winnsboro Branch, Jackson Creek, and Mill Creek Watersheds................................................................................................ 1-15 Figure 2-1 Comparison of Precipitation and Fecal Coliform Concentrations in Crane Creek (B-316) ............................................................................................. 2-4 Figure 2-2 Comparison of Fecal Coliform Concentrations at B-243 and B-064 ......... 2-7 Figure 2-3 Comparison of Fecal Coliform Concentrations at B-123 and B-077 ......... 2-8 Figure 3-1 Locations of NPDES Dischargers, MS4s, and Animal Feeding Operations in Turkey Creek, Meng Creek, Browns Creek, Gregory Creek, Sandy Creek, Dry Fork and Broad River Watersheds....................................................... 3-4 Figure 3-2 Locations of NPDES Dischargers, MS4s, and Animal Feeding Operations in Elizabeth Lake, Crane Creek, Smith Branch, Broad River, Little River, Winnsboro Branch, Jackson Creek, and Mill Creek Watersheds............... 3-5 Figure 5-1 Estimated Fecal Coliform Load and Critical Conditions for Ross Branch, Station B-086 .............................................................................................. 5-3 Figure 5-2 TMDL for B-086 Ross Branch ................................................................. 5-10 Figure 5-3 TMDL for B-136 Turkey Creek ............................................................... 5-11 Figure 5-4 TMDL for B-064 Meng Creek.................................................................. 5-12 Figure 5-5 TMDL for B-243 Tributary to Meng Creek ............................................. 5-13 Figure 5-6 TMDL for B-155 Browns Creek............................................................... 5-14 Figure 5-7 TMDL for B-335 Gregorys Creek ............................................................ 5-15 Figure 5-8 TMDL for B-046 Broad River.................................................................. 5-16 Figure 5-9 TMDL for B-074 Dry Fork....................................................................... 5-17 Figure 5-10 TMDL for B-075 Sandy River.................................................................. 5-18 Figure 5-11 TMDL for B-110 Elizabeth Lake ............................................................. 5-19 Figure 5-12 TMDL for B-316 Crane Creek ................................................................. 5-20 Figure 5-13 TMDL for B-280 Smith Branch ............................................................... 5-21 Figure 5-14 TMDL for B-337 Broad River.................................................................. 5-22 iii FINAL September 2005 Total Maximum Daily Load