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Stantec Consulting Corporation 57 Lafayette Circle,2nd Floor Lafayette,California 94549 Tel:(925)299-9300 Stantec Fax:(925)299-9302 February 4, 2009 Robert Aragon Department of Toxic Substances Control 700 Heinz Avenue Berkeley, California 94710 RE: Well Abandonment Work Plan Pacific Gas and Electric Company, Former Lodi Manufactured Gas Plant, Lodi, California Dear Mr. Aragon: On behalf of Pacific Gas and Electric Company (PG&E), Stantec Consulting Corporation (Stantec) is submitting this Well Abandonment Work Plan for two former water wells located at PG&E's Former Lodi Manufactured Gas Plant at 712 South Sacramento Street in Lodi, California (Site; Figure 1). As stated in Stantec's August 7, 2008 Remedial Investigation (RI) Work Plan, this work plan for well abandonment is being submitted based on preliminary field investigations of the wells and is being submitted to the Department of Toxic Substances Control (DTSC)for review and approval. The abandonment of the wells is considered a separate activity from the remedial investigation activities currently ongoing at the Site. This work plan includes a Site background and description, details of the wells, and details the tasks for the proposed scope of work. BACKGROUND The Site was formerly a crude oil manufactured gas plant (MGP) constructed in 1913 by the Sacramento Natural Gas Company. In 1926, PG&E took over the operation of the gas plant and possession of the property, consisting of Parcels A and B. In 1928, PG&E completed the construction of a high pressure gas pipeline into Lodi, and on June 22, 1928, the gas plant was shut down. The generator and boiler buildings were demolished in 1931 and the gas storage holders were removed in 1934 and 1956. In 1958, PG&E sold Parcel A to the City of Lodi and Parcel B to the Central California Traction Company. Parcel A is a 25-foot wide strip along the west side of the property which was later used by the City of Lodi for street widening and improvement. Parcel B was used primarily for storage. In the 1970s, Parcel B was used for warehousing by the California Fruit Exchange. The Central California Traction Company sold the Site to the Reynolds Packing Company in 1988, to only buy it back again in 1992. In 2006, PG&E purchased Parcel B from the Central California Traction Company for the purpose of investigation and remediation. SITE DESCRIPTION The former Lodi MGP site is approximately 0.73 acre of predominantly flat, unpaved, vacant land that is fenced along its perimeter of Parcel B. The only recent structure at the Site was the former MGP General Shop and Store Room (Meter House), located in the northwest corner of the Site, that was demolished in May 2008. Site features associated with the former MGP operations are shown in Figure 2 including locations of the former garage, gas storage holders, generator and boiler building, purifiers, sump, oil