SRK was engaged by the US Environmental Protection Agency (EPA) Region 10 to assist in reviewing the remedial design for the closure of the Formosa mine, Oregon and Ballard mine Superfund sites, Idaho. The Ballard mine, a historical phosphate mine, operated from 1951 to 1969, spans 534 acres with multiple open pits and waste rock dumps. Past mining led to elevated selenium levels in various media. A remedial investigation and feasibility study were completed, resulting in a 2016 Record of Decision. SRK reviewed percolation analyses and cover designs, including a four-layer enhanced cover to limit percolation and prevent contact with waste rock.
By SRK United States
