The 102-acre River Road Landfill (Waste Management, Inc.) site is located in Mercer County, Pennsylvania. From 1962 to 1986, the landfill accepted municipal and industrial wastes, including foundry and metal processing waste, polychlorinated biphenyl (PCB) waste, asbestos, and residues from tank car cleaning. Disposal activities contaminated soil and groundwater with hazardous chemicals. Following cleanup, operation and maintenance activities are ongoing. EPA took the site off the Superfund program�s National Priorities List (NPL) in January 2004.