| Abstract |
The Outboard Marine site is on the west shore of Lake Michigan in Waukegan, Illinois. A marine products manufacturing plant operated at the site for approximately 20 years until production ended in the early 1970s. From 1961 to 1972 hydraulic fluid containing PCBs was used at the plant in the die cast works. The fluid was later discharged to Slip 3 of the harbor, a parking lot north of the plant, and three areas known as the North Ditch, Oval Lagoon, and Crescent Ditch. There is an estimated 700,000 pounds of PCBs onsite and approximately 300,000 pounds in Waukegan Harbor. The primary contaminants of concern affecting the soil and sediment are PCBs. The selected remedial action for this site includes construction of a cutoff wall and slurry wall to isolate Slip 3 and form a containment cell; construction of a new slip to replace Slip 3, and relocate Larsen Marine; removal and treatment of sediment in Slip 3; excavation and onsite treatment of soil and sediment exceeding 10,000 mg/kg PCBs from the Crescent Ditch/Oval Lagoon Area; construction of a west containment cell for treatment residues and lower concentration PCB-contaminated soil; construction of an east containment cell around the parking lot area; construction of a temporary, onsite water treatment facility for dredged water; construction of a permanent water treatment facility; onsite treatment of containment cell water followed by discharge to either a POTW or an onsite location; capping of all containment cells; and ground water monitoring. The estimated capital cost for this remedial action is $19,000,000; O&M costs were not provided. |
