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I'Vers"TarIONC SACRAMENTO • Letter to Mr. Ulycess Williams May 16, 1989 Page 2 The property was acquired by Mr. Williams in 1987. Since that time he has leveled the grade and removed the concrete foundation of the former_ service station. VERSAR INVESTIGATION UST Removal Documentation Versar obtained a copy of a letter dated August 31, 1977, from the Marketing Department at Chevron U.S.A., Inc. (Chevron), to the Lessee of the station. In the letter, Chevron stated they had "removed the improvements" which reportedly included the USTs. In a letter dated March 16, 1989, Versar requested that Chevron review their records for information regarding the site. A copy of the letter is included in Attachment III. Chevron's letter dated August 31, 1977, is also included in Attachment III. • Ms. Heather Heath, Marketing Assistant, Marketing Operations Division, Chevron, instigated a records search for the operational file of the service station. According to Ms. Heath, Chevron normally destroys site records 10 years after severing all relationships with the site. The operational file for the site had apparently been destroyed; however, copies were found of the contracts for the sale and disposal of the three USTs after their removal. These contracts, dated January 6, 1976, are included in Attachment III. Subsurface Investigation On April 17, 1989, Versar representatives Mr. Kayo Dokken, Geohydrologist, and Mr. R. Stephen Wilson, Geohydroiogist, conducted a subsurface site assessment at the property. The investigation consisted of the following two parts: (1) conducting a soil vapor survey at 10 locations throughout the property, and (2) drilling and sampling of three 25 -foot boreholes. The locations of the soil vapor collection points and the boreholes are shown in Figure 2, Attachment I. The drill permit issued by the San Joaquin Local Health District is included in Attachment IV. The soil vapor data were obtained using a Xitech Vista 4000GLS soil vapor probe and a Foxboro 128 organic vapor analyzer (OVA). At each site, the vapor probe was advanced to a depth of two feet below the surface where air was pumped from the soil and screened by the OVA. Soil vapor readings ranged between zero and 1.5 parts per million (ppm) .at all locations except for one, SV8, where seven ppm was detected. The probe was subsequently advanced to five feet below the surface at SV8 and organic vapors were not detected at that depth.