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Monitoring and Reporting Requirements, Part I

Monitoring and Reporting Requirements, Part I. The Ground Water Rule Workshop Department of Environmental Conservation September 22-23, 2009. Leah Guzman and David Edmunds Environmental Program Specialists Leah.guzman@alaska.gov David.edmunds@alaska.gov. Presentation Outline.

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Monitoring and Reporting Requirements, Part I

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  1. Monitoring and Reporting Requirements, Part I The Ground Water Rule Workshop Department of Environmental Conservation September 22-23, 2009 Leah Guzman and David Edmunds Environmental Program Specialists Leah.guzman@alaska.gov David.edmunds@alaska.gov

  2. Presentation Outline • Source Water Monitoring • Triggered Monitoring • Assessment (Targeted) Monitoring • GWR and TCR – How Will Current TCR Requirements Change under the GWR? • Consecutive Systems • Site Sampling Plan • Analytical Methods for Fecal Indicators

  3. Source Water Monitoring

  4. Triggered vs. Assessment Monitoring • Triggered Source Water Monitoring • All Ground Water Systems that are notified of a +TC sample in accordance with the TCR (Total Coliform Rule) • The GWS must collect at least one ground water source sample from each source which is utilized at the time of the + TC sample as part of the four repeats required by the TCR regardless of Treatment

  5. Triggered vs.Assessment (Targeted) Monitoring(cont’d.) Assessment (Targeted) Monitoring • State has the option of requiring systems that are vulnerable to microbial contamination to evaluate source water • Historical positive total coliform sampling • Could include 1 year of fecal-indicator monitoring of the source, in addition to the TCR requirements

  6. GWR and TCR- How Will TCR Requirements Change under the GWR? • Existing TCR regulation requires ground water systems to collect four repeats in the distribution system if the routine sample is positive • Under the GWR, ground water systems will need to collect three repeat samples from the distribution system and one from the source • If the Source is positive for E. coli, it will require additional sampling (5 samples from the source) and possible corrective action

  7. Consecutive System Requirements • If a system that purchases ground water from a public water system has a positive TCR sample, the wholesaler must sample from its source water to meet the GWR.

  8. TCR Sampling 24 hours to get sample to lab, 48 hour waiver available for remote systems

  9. Site Sampling Plan The diagram below provides an example of a system schematic that could be used to determine representative sources and develop a triggered source water monitoring plan, based on where in the distribution system the total coliform-positive sample is found. If approved by the State, the system could sample sources 1 and 2 after a total coliform-positive at Site 1 since Site 1 is in the zone served by those sources. A total coliform-positive at Site 2 would require source sampling from all sources since this area is served by all sources.

  10. Analytical Methods for Fecal Indicators Total Coliforms Fecal Coliforms E. coli

  11. EPA-Approved Methods

  12. Summary • Source Water Monitoring • Triggered Monitoring • Assessment (Targeted) Monitoring • GWR and TCR – How Will Current TCR Requirements Change under the GWR? • Consecutive Systems • Site Sampling Plan • Analytical Methods for Fecal Indicators

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