TMDL – Fecal coliform Frank Henning UGA Watershed Extension Agent.

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Presentation transcript:

TMDL – Fecal coliform Frank Henning UGA Watershed Extension Agent

303(d) List Subset of 305(b) list Lists waters that do not meet state water standards Not supporting or Partially supporting designated use Delist = change listing to supporting

Common Sources of Fecal coliform Contamination Ag runoff Domestic animal waste Urban runoff Illicit discharges Leaking & overflowing sewer lines Treatment plant bypass Failed septic systems Wildlife

Designated use standards for FC Recreation (swimming): 100 counts/100 ml for coastal 200 counts/100 ml for other recreation waters Drinking supplies, Fishing & Coastal Fishing: May – Oct. 200 counts/100ml Nov. – April 1,000 counts/100ml Maximum of 4,000 counts/100 ml Wild River and Scenic River: No alteration of natural water quality

For recreation, drinking and fishing waters, should water quality and sanitary studies show fecal coliform levels from non-human sources exceed 200 counts/100ml (Geometric Mean) occasionally, then the allowable geometric mean fecal coliform… shall not exceed 300 /100 ml for lakes and reservoirs shall not exceed 500 /100ml in free flowing freshwater streams Wildlife Provision (GA EPD, 2004)

Fecal Geometric Means Collected quarterly (4 GMs/year) Each quarterly GM consists of at least 4 samples collected within a 30 day period Samples collected at least 24 hours apart GM = (Y1*Y2*Y3*Y4) ¼

Sample Timing Warm Quarters: May - July, Aug. - Oct. (more human contact and more stringent FC standards) Cool Quarters: Nov.- Jan., Feb. - April (less human contact and less stringent FC standards)

Develop Local Interest

Look at Existing Data Develop Local Interest Cool (1,000) Warm (200) *Warm (200) Cool (1,000)

Target Sample

Identify Bacteria Hotspots

Citizens Monitoring Bacteria Study Percent of samples with home lab and state lab values both either above or below the 235 cfu/100 mL cutoff value. Testn % Agreement Colisure (IDEXX)174 88% Petrifilm (3M)499 85% Colilert (IDEXX)163 83% Easygel - Incubated504 81% Coliscan MF95 79% Easygel - Room Temp250 63%

Fecal Coliform counts/100ml Estimated E. coli counts/100 ml GA StandardGeorgia DataEPA Data Fecal vs. E. coli E.coli to Fecal coliform multiplier  E.coli * 1.38 (Vendrell, UGA, 2005)  E.coli * 1.59 (USEPA, 1986)

Decrease source (Edu., Maintenance, Reg.) Reduce transport/conveyance (filter/disconnect) Increase mortality (time and distance) Correcting Bacteria Problems

Target Educating

Submitting Water Quality Data for use by Georgia EPD

Sampling &Quality Assurance Plan Who is involved Qualifications Describe problem Why should listing be changed? How and when will project be done How can EPD be sure that data is reliable?