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Trevor Gauron

Greenville County, SC IDDE Program Highlights. Trevor Gauron. SCASM Meeting May 8, 2007. Greenville County, South Carolina. Located in foothills of Appalachian Mountains Medium MS4 under NPDES Phase I Approximately 800 square miles Current Population ≈ 393,000

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Trevor Gauron

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  1. Greenville County, SCIDDE Program Highlights Trevor Gauron SCASM MeetingMay 8, 2007

  2. Greenville County, South Carolina • Located in foothills of Appalachian Mountains • Medium MS4 under NPDES Phase I • Approximately 800 square miles • Current Population ≈ 393,000 • Annual Rainfall ≈ 50 inches Greenville County

  3. Phase Designations for Outfall Inventory Activities • Phased, 5-year approach • Urbanized areas targeted first • Rural watersheds left for end of permit term

  4. Searching for Illicit Discharges • Two-staged approach Stage 1 • Outfall Inventory to locate outfalls and find obvious illicit discharges • e.g. Sanitary sewer leaks Stage 2 • Investigate sampling results • e.g. Less obvious illicit discharges Outfall Inventory Field Work

  5. Logitech 420 digital camera Fujitsu ST-4121 Tablet PC Garmin GPS/76 Field Backpack Setup Inventory Equipment • Ruggedized pen based computer- Fujitsu Pentop • Trimble backpack GPS units • Digital Cameras or web camera

  6. Physical Parameters • Color • Odor • Deposits and stains • Floatable matter • Temperature • Turbidity • Changes in flow • Vegetation change • Structural damage • Grease / oil Dry Weather Screening Methodology • Performed while conducting outfall inventory • 72 hours or greater with < 0.1” of precipitation • Grab sample tested for chemical/physical attributes • Between 4 hours and 24 hours later run second grab for the same analytes Chemical Parameters • pH • Chlorine • Copper • Phenols • Surfactants

  7. Dry Weather Screening Methodology Testing for Phenols and Surfactants

  8. Sampling Data • Interpreting Sampling Data • Set ranges/limits in place • Indicative of sanitary sewage

  9. Data Analysis to Determine Problem Outfalls

  10. GILLTracker (Geographic ILLicit Tracker)

  11. Delineate Drainage Basin

  12. Search for Dischargers

  13. Search for Dischargers

  14. Search for Dischargers

  15. Identify Source Greenville Meats, Inc

  16. Summary Sheets - Location Data

  17. Summary Sheets - Tracking Process

  18. Summary Sheets – Source Identification

  19. Quantifying Illicit Discharge Reductions Two Types of Quantifications: • Number of illicit discharges and potential illicit discharges found • Illicit discharge load reductions – how much pollutant was kept out of the waterbodies

  20. Quantifying Illicit Discharge Reductions – Stage 1 • Outfall inventory field crews will locate sources if obvious • Illicit discharges found by outfall inventory field crews: Total = 236

  21. Quantifying Illicit Discharge Reductions • A summary of program statistics: • 302 total illicits found, 186 remediated, 116 on-going

  22. Quantifying Illicit Discharge Reductions Table 9. Illicit Tracking Annual and Permit Term Loadings, First Permit Term Key: lbs = pounds lbs/yr = pounds per year MPN = maximum possible number

  23. Quantifying Illicit Discharge Reductions Reduction Loadings Calculation: Average Concentration Conversion Factors Estimated Flow Rate Estimated Annual Loading

  24. Quantifying Illicit Discharge Reductions Reduction Qualifications: • Flow rates were estimated in the field for only some of the qualifying illicit discharges • Per Section 23. Design Flow, 23.1 Per Capita Flow of the publication entitled Recommended Standards for Sewage Works 1878 Edition: • All flow rates were assumed to be flowing at a rate of 100 gallons per day • 100 gallons/day = 0.0001547 cfs • All flows were assumed to flow 24 hrs./day

  25. Quantifying Illicit Discharge Reductions What was learned? • Make sure you have a sampling method that will yield valid results • Develop a more precise way to estimate flow rates • Determine what parameters will be quantified and plan accordingly

  26. Questions? • Trevor Gauron trevor.gauron@woolpert.com Woolpert, Inc. Columbia, SC 803-731-0261 • Doyle Allen allend@jackson.army.mil Fort Jackson 803-751-7232

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