2017 Water Resources Monitoring Report
Now Available:
2017 East Helena Groundwater Monitoring Report, East Helena Facility, Prepared December 2018
2017 Groundwater and Surface Water Corrective Action Monitoring Plan, July 2017
2017 Groundwater and Surface Water Corrective Action Monitoring Plan for the former ASARCO East Helena Facility, prepared July 2017. Download the PDF here.
2015–2016 East Helena Groundwater Monitoring Report
Now Available:
2015-2016 East Helena Groundwater Monitoring Report, East Helena Facility, Prepared December 2017
2016 East Helena Slag Pile Cover Concepts Technical Memo, Dec 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.
2016 Technical Memo: Existing Information and Data Compilation for Slag Pile Area, May 2016
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, April 2016
2016 Groundwater and Surface Water Corrective Action Monitoring Plan for the former ASARCO East Helena Facility, prepared April 2016. Download the PDF here.
2015–2016 Final Addendum to Interim Measures Work Plan, Mar 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, Mar 2016
2015 Supplemental Contaminant Source Area Investigation at the Former East Helena Smelter Site. Prepared March 2016.
2016 Technical Memo: Update on Corrective Measures Study Activities, March 2016
Now Available:
March 3, 2016 Technical Memo – Former ASARCO East Helena Facility Update on Corrective Measures Studies Activities
2015–2016 Draft Addendum to Interim Measures Work Plan, Jan 2016
Now Available:
January 14, 2016 Former ASARCO East Helena Facility Draft Addendum to Interim Measures Work Plan—2015 and 2016