DNR Consultant: Bentonite clay seal of waste dam “Hail Mary type of concept,” “wouldn’t be allowed in other jurisdictions.”

This memo from Spectrum Engineering, a DNR consultant, takes issue with several aspects of the mine waste stockpile and dam plans. It raises concerns about climate change impacts on the stability of the PolyMet waste dam proposal. Also, it notes that permitting a temporary earthen dam for permanent use “wouldn’t be allowed in other jurisdictions.” Screenshot below: Spectrum Memo 2012

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