We prepared this October 2020 fact sheet with the U.S. Environmental Protection Agency (EPA) to provide an update on cleanup actions to address arsenic contamination in groundwater at the East Helena Site. The fact sheet explains corrective measures taken to date, as well as next steps and future plans. Download the fact sheet here (PDF)
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.
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
Now Available: 2020 Groundwater and Surface Water Corrective Action Monitoring Plan for the East Helena Facility, Prepared May 2020. Download this PDF
Now Available: 2019 East Helena Water Resources Monitoring Report, East Helena Facility, Prepared August 2020. Download this PDF (13 MB)
Now Available: 2019 Groundwater and Surface Water Corrective Action Monitoring Plan for the East Helena Facility, Prepared May 2019. Download this PDF.
Now Available:
2018 East Helena Groundwater Monitoring Report, East Helena Facility, Prepared December 2019
Now available:
2018 Groundwater and Surface Water Corrective Action Monitoring Plan for the East Helena Facility, Prepared June 2018
Now Available:
Presentation from April 2018 Public Meeting — East Helena Groundwater Update and Corrective Measures Study (CMS) Report.
Now Available:
Presentation from April 2018 Public Meeting — 2018 East Helena Project Groundwater Update