Archive for category: Current Studies

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 11^th 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

2017 Groundwater and Surface Water Corrective Action Monitoring Plan for the former ASARCO East Helena Facility, prepared July 2017. Download the PDF here.

Now available:

Technical Memorandum, Slag Pile Cover Concepts for the East Helena Former ASARCO Smelter Site. Prepared December 2016. This Memo provides an update to the September 2016 Slag Pile Cover Concepts, with a recommended cover concept for the slag pile at the Site.

Download the PDF here.

2016 Groundwater and Surface Water Corrective Action Monitoring Plan for the former ASARCO East Helena Facility, prepared April 2016. Download the PDF here.