U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

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EPA Region 10, 182 pp, 2019

This Record of Decision addresses Operable Unit [OU]1 of the Ballard Mine Superfund Site. The selected remedy includes a combination of engineered source controls, permeable reactive barriers, sediment control best management practices, and engineered wetland treatment cells. A key element is controlling the release of contaminants from waste rock dumps and mine pits by backfilling pits; consolidating, grading, and shaping waste rock; and constructing an approximately 5- to 6-ft-thick engineered cover system over more than 500 acres. Monitored natural attenuation will act as a polishing step or a final treatment stage if groundwater contamination remains after treatment. Remedial construction will be implemented in phases, aligning with the anticipated recovery of phosphate ore from different areas of the site. The overall timeline for construction is estimated to be 6-8 years and the cost of implementing the remedy, ~$41 million.

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