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Groundwater Investigation in Pavillion, Wyoming: Phase I Sampling Results

This report presents the findings of the Phase I groundwater investigation in Pavillion, Wyoming, conducted on August 11, 2009. The sampling objectives included determining the presence of contamination in domestic wells, characterizing contaminants, and assessing potential impacts on public health and the environment. The results indicate that most sampled wells show no apparent health concerns, although further sampling is recommended for specific wells and potential sources. The report also discusses the need for stakeholder meetings to plan the next sampling efforts and EPA's communication with EnCana to address any adverse impacts of oil and gas production.

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Groundwater Investigation in Pavillion, Wyoming: Phase I Sampling Results

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  1. Pavillion Groundwater InvestigationPavillion Wyoming Phase I Sampling Results August 11, 2009

  2. Sampling Objectives • Determine if contamination is present in domestic wells • Determine contaminant characteristics • Determine potential impacts to public health and the environmennt

  3. CLP Lab Data SVOC + TICs VOCs + TICs Pesticides PCBs TAL Metals Process Data Validation Interpretation Relevance Select Wells and Sources for Further Investigation R8 Lab Data Low SVOC TICs Low VOC TICs TOF-MS PMBE Anions Water Chemistry Merge Data Sources Choose Tests/ Methods for Further Investigation Com Lab Data GRO DRO BAC-T Determine Relevant Data

  4. EPA R8 Lab: TICs

  5. VOC & SVOC TICs: Summary

  6. Methane Detections

  7. Summary and Interpretation of Results • Our results show most wells sampled have no apparent health concerns • 11 wells have insufficient data for us to assure well owners of no health concerns from drinking their well water (EPA is working with those well owners) • Potentially a connection between our results and oil and gas production activities. We cannot pinpoint any specific source at this time.

  8. Next Steps • Further Sampling for specific drinking water wells and potential sources • Meeting with stakeholders to determine the best way to approach the next sampling effort • Parallel issue: EPA will be talking with EnCana to evaluate and reduce any potential overall adverse impacts of oil and gas production.

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