Unreclaimed Areas

Site Evaluations
There are 39 sites, covering nearly 90 acres, in the Butte Priority Soils Operable Unit (BPSOU) that may have been impacted by historic mining activities and may require reclamation. In the proposed remedy, each of these sites would be evaluated by Atlantic Richfield Company to determine if they were impacted by past mining and if they present a risk to human health or the environment. If so, the sites would be reclaimed.

Site Reclamation
Any reclamation and other construction activities that are performed by Atlantic Richfield Company at these sites would be conducted under the direction of the EPA, in consultation with MDEQ. This work may include import and placement of additional soil, revegetation, and/or construction of stormwater controls, which may include additions or upgrades to any curbs and gutters around the site.

Site-specific Details:

• The evaluation will include additional sampling to determine if contaminants of concern exceed the human health action levels, contribute sediment to existing wet weather control features, or contribute to the degradation of surface water quality.
• Following evaluation, a remedial action work plan would be developed and used to direct reclamation activities.
• Following completion of reclamation activities, each site would be incorporated for ongoing inspection and maintenance within the Butte Reclamation Evaluation System.
• Regular inspection and maintenance work would be funded by Atlantic Richfield Company and performed by Butte-Silver Bow County.

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