The 11-acre Onalaska Municipal Landfill site includes a 7-acre landfill owned by the Township of Onalaska, which is located in central-western Wisconsin. The Black River and its associated wetlands are 400 feet west of the site and lie within a wildlife and fish refuge. Approximately 320,000 gallons of liquid solvent waste and approximately 1,000 drums of solvent waste were either burned with other trash onsite or poured directly into holes for burial in the southwestern portion of the landfill. The primary contaminants of concern affecting the soil and ground water are VOCs, including benzene, toluene, xylenes, and TCE; other organics including PAHs; and metals including arsenic and lead. The selected remedial action for the site includes in-situ bioremediation of the solvent-contaminated soil and, if feasible, a portion of the landfill debris; pumping and treatment of the ground water plume using aeration, clarification, and filtration, followed by discharge of the treated ground water into the Black River and onsite disposal of the sludge.

"08/14/90." "PB91-921410." "EPA/ROD-R05-90-125." "August 1990." "Office of Emergency and Remedial Response."