The selected remedy for OU4 addresses contaminated surface water, ground water, and sediment from mine waste piles within the Study Area. The cleanup strategies will address threats through the capping or removal of waste piles and treatment of point and non-point sources of surface water contamination.

This Proposed Plan identifies the preferred alternative for OU4 water treatment. The mining-impacted waters of Gregory Gulch, Gregory Incline and National Tunnel are acidic and contain high concentrations of heavy metals. This proposed amendment calls for construction of a new water treatment plant designed and operated specifically to treat discharges from the National Tunnel and Gregory Incline, as well as base surface water flow and alluvial ground...

This Community Involvement Plan revision for the Central City/Clear Creek Superfund Site is intended to reflect the changes, both actual and as perceived by the community, since the original 1989 plan was last revised in September 2004. This revision of the 2004 revision of the Community Involvement Plan, based on community interviews, describes the community involvement and public participation program developed for the Central City/Clear Creek Superfund...

This Colorado Environmental Performance Partnership Agreement (CEPPA) is an agreement that identifies and explains the key environmental priorities and goals in the State of Colorado, and the working relationship between the Colorado Department of Public Health and Environment (CDPHE) and the U.S. Environmental Protection Agency (EPA). It allows Colorado to identify key state priorities, allocate federal resources to the highest state priorities,...