2017 Groundwater and Surface Water Corrective Action Monitoring Plan
2017 Groundwater and Surface Water Corrective Action Monitoring Plan for the former ASARCO East Helena Facility, prepared July 2017. Download the PDF here.
East Helena Slag Pile Cover Concepts Technical Memo, December 2016
Now available:
Technical Memorandum, Slag Pile Cover Concepts for the East Helena Former ASARCO Smelter Site. Prepared December 2016. This Memo provides an update to the September 2016 Slag Pile Cover Concepts, with a recommended cover concept for the slag pile at the Site.
Technical Memo – Existing Information and Data Compilation for Slag Pile Area
Technical Memorandum – Existing Information and Data Compilation for the Former East Helena Smelter Slag Pile Area, May 2016. Download the PDF here.
2016 Groundwater and Surface Water Corrective Action Monitoring Plan
2016 Groundwater and Surface Water Corrective Action Monitoring Plan for the former ASARCO East Helena Facility, prepared April 2016. Download the PDF here.
Final Corrective Measures Study Work Plan
Now Available:
October 22, 2015 Former ASARCO East Helena Facility Final Corrective Measures Study Work Plan
Final Addendum to Interim Measures Work Plan—2015 and 2016
Now Available:
March 23, 2016 Former ASARCO East Helena Facility Final Addendum to Interim Measures Work Plan—2015 and 2016
2015 Supplemental Contaminant Source Area Investigation Report
2015 Supplemental Contaminant Source Area Investigation at the Former East Helena Smelter Site. Prepared March 2016.
Update on Corrective Measures Studies Activities
Now Available:
March 3, 2016 Technical Memo – Former ASARCO East Helena Facility Update on Corrective Measures Studies Activities
Draft Addendum to Interim Measures Work Plan—2015 and 2016
Now Available:
January 14, 2016 Former ASARCO East Helena Facility Draft Addendum to Interim Measures Work Plan—2015 and 2016
Final Interim Measures Work Plan—2015 and 2016
Now Available:
May 29, 2015 Former ASARCO East Helena Facility Draft Interim Measures Work Plan—2015 and 2016