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.
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.
Now Available: 2022 Water Resources Monitoring Report for the former ASARCO East Helena Facility, prepared December 2023. Download the PDF here.
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.
Now available: 2021 Water Resources Monitoring Report for the East Helena Facility. Finalized December 2022. Download the PDF here.
Sampling Methodology Addendum – Unfumed Slag Processing and Removal Groundwater Monitoring Plan. Prepared February 2022.
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 for the East Helena Former Smelter Facility. Prepared August 2021.
Now available: 2020 Water Resources Monitoring Report for the East Helena Facility. Prepared June 2021. Download the PDF here.
Now Available: 2021 Groundwater and Surface Water Corrective Action Monitoring Plan for the East Helena Facility, Prepared June 2021. Download the PDF here.