2021 Groundwater and Surface Water Corrective Action Monitoring Plan, June 2021

Now Available: 2021 Groundwater and Surface Water Corrective Action Monitoring Plan for the East Helena Facility, Prepared June 2021. Download the PDF here.

2020 Water Resources Monitoring Report, June 2021

Now available: 2020 Water Resources Monitoring Report for the East Helena Facility. Prepared June 2021. Download the PDF here.

2020 Corrective Measures Study (CMS) Report Addendum, Oct 2020

Now Available: Corrective Measures Study (CMS) Report Addendum for the East Helena Facility, prepared October 2020. This addendum finalizes the 2018 draft CMS report, linked here.  Download the addendum here.

2020 Statement of Basis for Groundwater, Surface Water and Soil Corrective Measures Decision, July 2020

The Statement of Basis for Groundwater, Surface Water and Soil Corrective Measures (Remedy) Decision at the former ASARCO East Helena Facility and Response to Comments, July 2020, is available here.

Statement of Basis Final Combined for GW, SW, and Soil CMs (Remedy) Decision July 2020

2020 Groundwater and Surface Water Corrective Action Monitoring Plan, May 2020

Now Available: 2020 Groundwater and Surface Water Corrective Action Monitoring Plan for the East Helena Facility, Prepared May 2020. Download this PDF

2019 Water Resources Monitoring Report

Now Available: 2019 East Helena Water Resources Monitoring Report, East Helena Facility, Prepared August 2020. Download this PDF (13 MB)

2019 Groundwater and Surface Water Corrective Action Monitoring Plan, May 2019

Now Available: 2019 Groundwater and Surface Water Corrective Action Monitoring Plan for the East Helena Facility, Prepared May 2019. Download this PDF.

2018 Water Resources Monitoring Report

Now Available:
2018 East Helena Groundwater Monitoring Report, East Helena Facility, Prepared December 2019

Download this PDF (8 MB)

2018 Corrective Action Monitoring Plan, June 2018

Now available:

2018 Groundwater and Surface Water Corrective Action Monitoring Plan for the East Helena Facility, Prepared June 2018

Download this PDF here.

 

2018 Draft Former ASARCO East Helena Facility Corrective Measures Study (CMS) Report, March 2018

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