CARPENTER SNOW CREEK MINING DISTRICT
Health & Environment
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What Are the Risks at the Site?
Approximately 96 abandoned mines have been identified in the Carpenter Snow Creek Mining District Superfund site, and at least 21 of these have been identified as probable sources of contamination to surface water. There are also more than 12 adits (horizontal mine openings) that discharge mine-influenced water, usually of poor quality with low pH and high concentrations of dissolved metals. In general, the flow from these adits increases during and after snow melt and then slowly decreases into fall and winter. The concentration of metals can also vary greatly, depending on whether the water is derived from surface water or groundwater. In addition to the adit discharges, there are also documented impacts from mining waste to soil, surface water and stream sediments in Carpenter Creek, Snow Creek and Belt Creek in reports and technical memorandums generated since 2009. Risks and pathways addressed by the cleanup include health risks from people ingesting, touching or inhaling contaminants in soil, sediment, surface water and groundwater.
EPA uses performance measures to track environmental results at Superfund sites. If you have any questions or concerns about the measures at this site, please contact the site team members listed under Site Contacts.
Read more about Superfund Remedial Performance Measures.
|Status at this
|What does this mean?|
|Human Exposure Under Control||No||Yes means assessments indicate that across the entire site:
No means an unsafe level of contamination has been detected at the site and a reasonable expectation exists that people could be exposed.Insufficient data means that, due to uncertainty regarding exposures, one cannot draw conclusions as to whether human exposures are controlled, typically because:
|Groundwater Migration Under Control||No||
Yes means EPA reviewed all information on known and reasonably expected groundwater contamination. EPA concluded the migration of contaminated groundwater is stabilized and there is no unacceptable discharge to surface water. EPA will conduct monitoring to confirm that affected groundwater remains in the original area of contamination.
No means EPA has reviewed all information on known and reasonably expected groundwater contamination, and the migration of contaminated groundwater is not stabilized.
Insufficient data means that due to uncertainty regarding contaminated groundwater migration, EPA cannot draw conclusions as to whether the migration of contaminated groundwater is stabilized.
Yes means the physical construction of the cleanup is complete for the entire site.
No means either physical construction is not complete or actions are still needed to address contamination.
|Sitewide Ready for Anticipated Use||No||Yes means:
No means that one or more of these three criteria have not been met. However, a site listed as no may still have redevelopment occurring on portions of the site and may be eligible for additional redevelopment.