The Montana Environmental Trust Group is conducting an Upper Lake drawdown test at the former ASARCO smelter site (the plant site) in East Helena, Montana. The purpose of this test is to simulate, at least partially, the effects of eliminating recharge from Upper lake on plant site groundwater levels, flow rates, and contaminant loading to groundwater.
For more information, download the Upper Lake Tech Memo (7MB PDF).
2012 Former ASARCO East Helena Facility Interim Measures Work Plan—Conceptual Overview of Proposed Interim Measures and Details of 2012 Activities, revised September 2012
This document was prepared for Montana Environmental Trust Group, LLC by Hydrometrics, Inc. in September 2010.
Download the PDF: Data Mgmt Plan Phase II RFI.pdf
2010 Post-RI/FS Groundwater and Surface Water Field Sampling and Analysis Plan for the former ASARCO Smelter Site in East Helena. Download the PDF here.
This document was prepared for Montana Environmental Trust Group, LLC by Hydrometrics, Inc. in May 2010. It totals 118 pages and is a 5MB PDF file.
Supporting files:
This document was prepared for Montana Environmental Trust Group, LLC by Hydrometrics, Inc. in May 2010. It totals 86 pages and is a < 1MB PDF file.
This document was prepared for ASARCO Incorporated by Hydrometrics, Inc. in September 1998 and revised January 1999. It is the complete report totaling 2124 pages and is a 320MB PDF file.
Rather than downloading the entire report, you can view a summary by download any of the first four parts, each constituting sequential hundred page excerpts from the report:
If you’d like to download the entire 320MB file, you can access it here:
This document was prepared for ASARCO Incorporated by Hydrometrics, Inc. in March 1990. It totals 467 pages and is a 20MB PDF file.