The Bunker Hill Mining and Metallurgical Complex Superfund Site includes all areas of the Coeur d’Alene Basin where mining-related contamination occurred and encompasses a 21-square mile “Box” along Interstate 90 surrounding the former smelter complex. Operable Unit 1 (OU1) includes the populated areas and Operable Unit 2 (OU2) includes the non-populated areas within the “Box.” Operable Unit 3 (OU3) includes areas outside of the “Box” from near the Idaho-Montana border to the State of Washington where mining-related contamination is present.

• Optimization Review: Bunker Hill Mining and Metallurgical Complex Superfund Site, Central Treatment Plant (CTP), Kellogg, Shoshone County, Idaho (PDF)(51 pp, 3 MB, 2013, 542-R-13-004)