2021 East Helena Corrective Measures Implementation Work Plan, Aug 2021
Now Available: Corrective Measures Implementation (CMI) Work Plan for the East Helena Facility, finalized August 2021. Download the PDF here.
2021 Unfumed Slag Processing and Removal – Groundwater Monitoring Plan, August 2021
Unfumed Slag Processing and Removal – Groundwater Monitoring Plan for the East Helena Former Smelter Facility. Prepared August 2021.
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