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EXECUTIVE SUMMARY This Remedial Investigation (RI) Report, hereinafter referred to as the "Report," was prepared by Parsons on behalf of Pacific Gas and Electric Company (PG&E) to document remedial investigation activities conducted at the Former Tracy Manufactured Gas Plant (MGP) site located at 502 East Grant Line Road in Tracy, California(Site). Site investigation activities were conducted in July/August 2008 and April 2009 in accordance with the Remedial Investigation Workplan, dated April 21, 2008 (Parsons, 2008) and the Final Technical Memorandum - Supplemental Site Investigation for the Delineation of Data Gaps Identified During the Remedial Investigation dated March 6, 2009 (Parsons, 2009). This Report is being submitted by PG&E to the State of California Environmental Protection Agency (Cal/EPA), Department of Toxic Substances Control (DTSC) to comply in part with the Voluntary Cleanup Agreement (VCA), Docket No. HSA-VCA 07/08-072, issued by the DTSC to PG&E on October 12, 2007 (DTSC, 2007). The DTSC is authorized to review, evaluate, and approve documents such as this Report under the California Health and Safety Code (CH&SC), Chapter 6.8 Section 25187, which was developed to carry out a removal action in an effective manner that is protective of the public health and environment. Site Description The Site is located at 502 E. Grant Line Road, in Tracy, California (Figures 1 and 2). The Site occupies approximately 5.22 acres of property and is bound to the north by the existing PG&E substation which supplies electricity to a majority of the Tracy area; to the south by Hines Field, a vacant lot; to the east by a recently constructed industrial park; and to the west by railroad tracks owned by Southern Pacific. There are also residential properties located southwest of the Site just beyond the Southern Pacific Railroad right-of-way. The Site is currently owned by PG&E and is used as a Service Center. A review of historical records indicates that from 1927 until 1930, an oil-gas plant was operated at the Site. Based on the description of the Site in the Preliminary Assessment (PA) (PG&E, 1986), the plant equipment was retired in July 1930, when natural gas was made available in the Tracy area, and between 1930 and 1932 that plant was decommissioned. Equipment, including boilers and purifiers were dismantled and sent to other operational PG&E facilities. In 1934, the MGP was abandoned and according to records, the remainder of the plant was removed shortly thereafter. As a note, there are no available Sanborn Fire Insurance Maps that depict the former MGP or the surrounding area. As such, the information in the PA, which is based on newspaper reports and internal PG&E correspondence, cannot be corroborated using Sanborn Maps. Since 1930, the Site has been owned and operated entirely by PG&E. Prior to 1958, portions of the property currently owned by PG&E (Parcels A, B, and C) were owned by others including the Tracy Gas Company (Parcel A from 1927-1930), the Sierra & San Francisco Power Company (Parcel B from 1929 to 1936) and Berverdor Incorporated (Parcel C prior to 1958). Section 2.3 provides a detailed description of the ownership of the Site. Figures 3 and 5 provide the assessor's parcel map for the Site and the Title Map indicating the locations of Parcels A, B and C. The former MGP was confined to Parcel A as the adjacent parcels were not owned by the Tracy Gas Company during the period when MGP operations were occurring at the Site. PARSONS I FINAL RI REPORT-FORMER TRACY MGP APRIL 2010