This Settlement Agreement provides for the performance of a removal action by Respondent and the reimbursement of certain response costs incurred by the United States at or in connection with property located at 849 Pershing Road, Waukegan, Illinois. The North Plant MGP was constructed in 1912 as a gas production and storage facility. Prior to its excavation in 1992, a tar pond (the Waukegan Tar Pit ) was located in the northeast comer of the Site. The facility was operated by North Shore Gas as a manufactured gas plant and storage facility between 1912 and 1953. Gas was manufactured via coal carbonization (1912-1927), water gas (1927-1951), and oil gas (1951-1953) processes. From 1953 to 1965, the facility provided a propane-air supplement to natural gas suppliers. Documents indicate potential contamination and migration of contaminants during plant demolition activities, including the rupture of a relief holder which released 400,000 gallons of water, tar emulsion, and tar to the soil.