The Ace Services Superfund Site is located near the east edge of the city of Colby in Thomas County, Kansas. The site is a former plating facility that was operated between 1954 and 1969 by Northwest Manufacturing Facility and between 1969 and 1989 by ACE Services. The site soils were impacted by chromium and lead compounds and ground water was impacted with hexavalent chromium as a result of these historical activities. The site contamination has been divided into two Operable Units (OUs). The OU1 remedy, which was completed in 2000, addressed existing buildings. The OU2 remedy utilizes a pump and treat (P&T) system to address ground water contamination of a sole source aquifer. The treated ground water from the P&T system is beneficially reused by the City of Colby, Kansas public water supply system.

• Remediation System Evaluation, Ace Services Superfund Site (PDF)(54 pp, 938 K, 2007, 542-R-07-017)