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EPA updates Butte-Silver Bow commissioners on Superfund work, residential sampling and repository siting
Summary
EPA Region 8 staff briefed the council on multiple operating units at the Silver Bow Creek/Butte area Superfund site, reporting progress on residential sampling, design work for corridor stormwater controls, Berkeley Pit pilot objectives and an imminent repository siting recommendation.
EPA project staff gave a detailed presentation to the Butte-Silver Bow Council of Commissioners on July 16 covering the status of several operable units at the Silver Bow Creek/Butte Area Superfund site.
The agency described three operable units that most directly affect the Butte community: Westside Soils (characterization phase), Butte Priority Soils (remedial action and post-construction in many areas) and the Mine Flooding Operable Unit (Berkeley Pit remedial action). “The Mine Flooding Operable Unit's currently in remedial action,” Jason Rappi, the project manager for the mine flooding unit, said. Rappi said the Berkeley Pit pilot project met its objectives and the team expects to complete the pilot’s steady-state assessment this summer and to begin a remedial-action-adequacy review.
Work in Butte Priority Soils continues under two enforcement mechanisms: a 2020 consent decree that governs corridor and large-scale projects and a 2011 unilateral administrative order (amended 2020) that covers residential cleanup. EPA staff said responsible…
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