2023 Interim Corrective Action Performance Monitoring Report
Now available: the 2023 Interim Corrective Action Performance Monitoring Report for the former ASARCO East Helena Facility, prepared November 2024. Download the PDF here.
2024 Groundwater and Surface Water Interim Corrective Action Performance Monitoring Plan
Now available: 2024 Groundwater and Surface Water Interim Corrective Action Performance Monitoring Plan for the former ASARCO East Helena Facility, prepared September 2024. Download the PDF here.
2023 Groundwater and Surface Water Corrective Action Monitoring Plan
Now Available: 2023 Groundwater and Surface Water Interim Corrective Action Performance Monitoring Plan for the former ASARCO East Helena Facility, Prepared December 2023. Download the PDF here.
2022 Water Resources Monitoring Report
Now Available: 2022 Water Resources Monitoring Report for the former ASARCO East Helena Facility, prepared December 2023. Download the PDF here.
2022 Groundwater and Surface Water Corrective Action Monitoring Plan
Now Available: 2022 Groundwater and Surface Water Corrective Action Performance Monitoring Plan for the former ASARCO East Helena Facility, Prepared December 2022. Download the PDF here.
2021 Water Resources Monitoring Report
Now available: 2021 Water Resources Monitoring Report for the East Helena Facility. Finalized December 2022. Download the PDF here.
Addendum – Unfumed Slag Processing and Removal Groundwater Monitoring Plan, Feb. 2022
Sampling Methodology Addendum – Unfumed Slag Processing and Removal Groundwater Monitoring Plan. Prepared February 2022.
East Helena Corrective Measures Implementation Work Plan, August 2021
Now Available: Corrective Measures Implementation (CMI) Work Plan for the East Helena Facility, finalized August 2021. Download the PDF here.
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.
2020 Water Resources Monitoring Report
Now available: 2020 Water Resources Monitoring Report for the East Helena Facility. Prepared June 2021. Download the PDF here.