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Floyds Fork Bacteria TMDL

Floyds Fork Bacteria TMDL. Andrea M. Fredenburg Kentucky Division of Water TMDL Section November 28, 2012. Goals. Present watershed information Present TMDL calculations Provide example for one stream segment Vote on options for path forward to public notice. KY’s Bacteria Criteria.

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Floyds Fork Bacteria TMDL

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  1. Floyds Fork Bacteria TMDL Andrea M. Fredenburg Kentucky Division of Water TMDL Section November 28, 2012

  2. Goals • Present watershed information • Present TMDL calculations • Provide example for one stream segment • Vote on options for path forward to public notice

  3. KY’s Bacteria Criteria

  4. Monitoring Data • 319 (h) funded—Currys Fork and Bullitt Co. • MSD • Historical KDOW data • EPA funded—USGS data collection

  5. Currys Fork WBP Sites (2007, 2009)

  6. Bullitt County WBP Sites (2005-2006)

  7. MSD Sample Sites (2000-2010)

  8. KDOW Sample Sites (1998-2009)

  9. USGS Sample Sites (2007-2008)

  10. USGS Sample Sites (2007-2008)

  11. Bacteria Impaired Segments • 18 impaired stream segments • 18 E. coli PCR • 4 Fecal coliform PCR • 4 Fecal coliform SCR • 26 listed waterbody/pollutant combinations

  12. Floyds Fork Bacteria Impairments

  13. Floyds Fork Bacteria Impairments

  14. Floyds Fork Bacteria Impairments

  15. Floyds Fork Bacteria Impairments

  16. Potential Sources • KPDES-permitted sources to WLA • Others to LA

  17. Sanitary Wastewater Systems

  18. Sanitary Wastewater Systems

  19. MS4 Entities

  20. KNDOPs

  21. KNDOPs

  22. Sewer Lines* *Information Not Available for Jefferson County

  23. Sewer Lines* *Information Not Available for Jefferson County

  24. Septic Tank Suitability

  25. Land Cover

  26. TMDL Calculation Example • South Fork Currys Fork 0.0 to 6.1 • E. coli PCR impairment • SFCF-2 USGS sample site

  27. South Fork Currys Fork

  28. TMDL Equation TMDL (allowable # per day) = Allowable Concentration (allowable # per 100 ml) x Flow (in cubic feet per second) x Conversion Factor (24,465,758.4 per day) Conversion factor is figured as 1 cubic foot = 28316.85 ml and 1 day = 86400 seconds 1 x 1 cubic foot x 28316.85 ml x 86400 seconds = 24,465,758.4 100 ml second 1 cubic foot 1 day 1 day

  29. SFCF-2 Sample Data

  30. Convert Gage Flow to TMDL Site Flow Flow at sample site = Acres of land draining to sample site ÷ Acres of land draining to gage site x Flow at gage Flow at sample site = 4672 acres ÷ 51136 acres x 233 cfs Flow at sample site = 21.3 cfs

  31. Site SFCF-2 TMDL TMDL = Allowable Concentration x Flow x Conversion Factor TMDL = 240 E. coli colonies per 100 ml x 21.3 cfs x 24,465,758.4 per day TMDL = 125,068,956,900 E. coli colonies per day TMDL = 1.25E+11 E. coli colonies/day

  32. Segment TMDL Segment TMDL = Site TMDL x Acres at downstream end of segment ÷ Acres at site Segment TMDL = 1.25E+11 E. coli colonies/day x 5949 acres ÷ 4672 acres Segment TMDL = 1.59E+11 E. coli colonies/day

  33. TMDL and Flow TMDL = Allowable Concentration x Flow x Conversion Factor TMDL ≈ Flow Sample Load = Sample Concentration x Flow (on sample day) x Conversion Factor

  34. Load Duration Curve

  35. Source Areas

  36. TMDL Allocations TMDL = ∑WLA + ∑LA + MOS Explicit MOS is 10% of TMDL South Fork Currys Fork 0.0-6.1 Segment TMDL = 1.59E+11 E. coli colonies/day MOS= 1.59E+11 E. coli colonies/day x 10% MOS= 1.59E+10 E. coli colonies/day

  37. SWS-WLA SWS-WLA = Allowable Concentration of Bacteria (#/100 ml) x Facility Design Capacity (Design Flow in cfs) x Conversion Factor (24,465,758.4/day) South Fork Currys Fork 0.0 to 6.1

  38. Remainder Remainder = TMDL – MOS – ∑SWS-WLA South Fork Currys Fork 0.0 to 6.1 Remainder = 1.59E+11 - 1.59E+10 - 1.68E+09 Remainder = 1.42E+11 E. coli (colonies/day)

  39. MS4-WLA MS4-WLA = # Acres of Developed Land in MS4 ÷ # Acres in Subwatershed x Remainder For South Fork Currys Fork 0.0 to 6.1 754 acres of developed land in the MS4 5948.52 acres in the subwatershed Remainder = 1.42E+11 E. coli (colonies/day) South Fork Currys Fork 0.0 to 6.1 MS4-WLA = 754 ÷ 5948.52 x 1.42E+11 MS4-WLA = 1.80E+10 E. coli (colonies/day)

  40. Future Growth WLA Future Growth-WLA = Future Growth WLA Percentage x Remainder South Fork Currys Fork 0.0 to 6.1 754 acres of developed land 5948.52 acres of land in the subwatershed. Percent Developed Area = 12.68 (754 ÷ 5948.52 = 12.68%) • Future Growth WLA Percentage = 2%, Remainder = 1.42E+11 Future Growth-WLA = 2% x 1.42E+11 E. coli (colonies/day) Future Growth-WLA = 2.83E+09 E. coli (colonies/day)

  41. LA ∑LA = TMDL - MOS - ∑WLA South Fork Currys Fork 0.0 to 6.1 TMDL = 1.59E+11 MOS = 1.59E+10 • ∑ SWS-WLA = 1.68E+09 • MS4-WLA = 1.80E+10 • Future Growth-WLA = 2.83E + 09 • ∑WLA =2.25E+10 ∑LA= 1.59E+11 – 1.59E+10 – 2.25E+10 ∑LA= 1.21E+11

  42. The TMDLs and Allocations • E. coli PCR • Fecal coliform PCR • Fecal coliform SCR

  43. E. Coli PCR TMDLs

  44. Fecal Coliform PCR TMDLs

  45. Fecal Coliform SCR TMDLs

  46. Vote • TAC review/comments prior to public notice • TAC review/comments concurrent with public notice

  47. Contact Information Andrea M. Fredenburg TMDL Section Division of Water 200 Fair Oaks Lane Frankfort, KY 40601 Andrea.Fredenburg@ky.gov

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