NOW AVAILABLE: 2025 Groundwater and Surface Water Interim Corrective Action Performance Monitoring Plan for the former ASARCO East Helena Facility was prepared in May 2025. Download the PDF here.
NOW AVAILABLE: 2024 Interim Corrective Action Performance Monitoring Report for the former ASARCO East Helena Facility was prepared in May 2025. Download the PDF here.
The Montana Environmental Trust Group (METG) Reappointment Framework Report, submitted to METG’s beneficiaries October 1, 2024, is available here.
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: the 2023 Interim Corrective Action Performance Monitoring Report for the former ASARCO East Helena Facility, prepared November 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.
Sampling Methodology Addendum – Unfumed Slag Processing and Removal Groundwater Monitoring Plan. Prepared February 2022.
Now available: 2021 Water Resources Monitoring Report for the East Helena Facility. Finalized December 2022. Download the PDF here.