In 2010 EPA interviewed local citizens and reviewed the status of Butte area Superfund sites as part of a required five-year review (the full review report is available here). Five-year reviews determine whether remedies or other response actions are protective of human health and the environment in compliance with a site’s decision documents. Methods, findings, and conclusions are documented in […]

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Summary of 2012 (published in March 2013) monitoring data related to the Butte Mine Flooding Consent Decree, which includes the Berkeley Pit and associated workings, from the Montana Bureau of Mines & Geology.    

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Throughout 2010, the EPA interviewed local citizens and reviewed the status of Butte area Superfund sites, including the Berkeley, as part of a five-year review. The final review report, released in 2011, is available to the public and can be downloaded at the EPA Butte/Silver Bow Creek website. The sections of the report relating to the Butte Mine Flooding Operable […]

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A performance test of the Horseshoe Bend plant was completed in November 2007, as mandated by the Record of Decision. Based on the performance review, water discharged from the plant meets all discharge standards for contaminants of concern set by the EPA. Additional adjustments still need to be made to address pH. In general, plant operations are going as expected. […]

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An Explanation of Significant Differences (or ESD) is a CERCLA (or Superfund) decision document prepared when there has been a significant change in cost, performance, or cost of a remedy selected in a Record of Decision (ROD). The significant change to the remedy may be as a result of new information. In 2002, EPA issued an Explanation of Significant Differences […]

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