The 1.5-acre Tri-State Plating site is located in Columbus, Indiana. Electroplating operations at the site contaminated soil and groundwater with cyanide and heavy metals, including chromium. Tri-State Plating stopped operating at the site in 1984. EPA placed the site on the Superfund program�s National Priorities List (NPL) in 1986. Following cleanup, EPA took the site off the NPL in July 1997.