Now Available for Public Review and Comment: Draft Former Asarco East Helena Facility Corrective Measures Study (CMS) Report

The Corrective Measures Study (CMS) Report, prepared by the Montana Environmental Trust Group, LLC (METG), Trustee of the Montana Environmental Custodial Trust, consists of an 88-page document followed by 6 appendices, 149 figures and 42 tables.  Due to the size of the CMS Report, it has been uploaded to the METG website in the following ten (10) separate links or installments.  Please note that it may take a few minutes to access the larger files.

  1. CMS Report
  2. Appendix A—Summary of Groundwater Modeling Supporting Corrective Measures Study
  3. Appendix B—Tier II Source Control Measure/Groundwater Remedy Evaluation—Phase 2 Results and Recommendations
  4. Appendix C—Summary of Soil Removal Alternatives Evaluation and Mining Visualization System Model Development
  5. Appendix D—Summary of Supplemental RFI Soil Sampling Results for Undeveloped Lands
  6. Appendix E—Human Health and Ecological Risk Assessment
  7. Appendix F—Slag Pile Cover Concepts Technical Memorandum
  8. Appendix G—Lead Education and Abatement Program Administrative Boundary
  9. Tables referenced in the CMS Report
  10. Figures referenced in the CMS Report

EPA has issued the CMS Report for public review and comment.  There will be a public meeting on Wednesday, April 11th from 6:30 to 8:30 pm at the Custodial Trust’s offices in East Helena (325 Manlove Street, East Helena) to review the CMS Report.

For more invitation, please see the Notice and Invitation

Final Baseline Ecological Risk Assessment

Download the Baseline Ecological Risk Assessment (BERA) for the East Helena Site. (59MB PDF)

Prickly Pear Creek (PPC) Fact Sheet

Download the PDF Fact Sheet containing information about:

  • Background
  • Existing Water Control Structures
  • What is the Upper Lake (UL) Aquifer Test?
  • Prickly Pear Creek (PPC) Studies
  • Cleanup Activities and Interim Measures
  • Current Concerns About Prickly Pear Creek (PPC)
  • How Will Clean Up Plans Improve Prickly Pear Creek (PPC)?
  • Interested in More Information?