Plan for treatment technology assessment

The guiding documents for Pit management require ongoing assessment and evaluation of the Horseshoe Bend Water Treatment Plant and the technology used to treat contaminated Pit water until several years prior to full-scale implementation. That implementation is required when water levels at any monitoring compliance point reach the Critical Level of 5,410 feet above sea level. A review of treatment […]

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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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Do Butte residents need flood insurance?

No. Butte residents don’t need to worry about flood insurance in regard to the Berkeley Pit and connected underground mine workings. The Berkeley Pit and connected tunnels act as a sink that collects groundwater in the area. Water levels in the Berkeley Pit and associated mine shafts are currently 175 to 200 feet below the rim of the Pit. The […]

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Yes, after a treatment technology review and upgrades to the plant are completed. The 1994 EPA Record of Decision and 2002 Consent Decree require a review of treatment technologies when the Critical Water Level (5,410 feet) is about four years away. The review will consider the plant’s ability to treat both Pit water and water coming from the Horseshoe Bend […]

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Could the Berkeley Pit ever overflow?

The Berkeley Pit will never overflow. In 1994 the EPA established the Critical Water Level (the maximum level the water will be allowed to reach) at 5,410 feet above sea level, which is one hundred feet below the rim. Water levels are regularly monitored at the Pit, in historic underground mines, and in wells surrounding the Pit. Failure to keep […]

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