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V <br /> 1 . INTRODUCTION <br /> Former Chevron Service Station (SS) 9-1918 in located on the <br /> northwest corner of the intersection of East Harding Way and in <br /> Dorado Street In Stockton, California (Figure 1 ). Chevron SS <br /> 9-1910 actively dispensed gasoline products and serviced auto- <br /> mobiles at thin site betvaon 1953 and 1908. The original station <br /> was remodeled, and fiberglana storago tanks vera installed, in <br /> 1984. The station was deactivated and damollGhod in early 198e; <br /> the underground otorago tanks were excavated and removed from the <br /> sato on 24 February. Soil camPlos collected from the tank oxca- <br /> vdtlon pit and the stockpiled excavated coil wore analyzed and <br /> contained up to 490 ppm lOw-boiling-paint hydrocarbons. The 15- <br /> r foot-deep tank excavation pit was backfilled with clean pea <br /> gravel. <br /> A coil vapor contaminant assessment (SVCA) was conducted on 17 <br /> November 1907. The SYCA consisted of driving a 5/8-Inch diameter <br /> stool probe into the soil <br /> to depths of up to 15 feet around the <br /> site, concentrated In the tank and Pump Island areas. The SVCA <br /> indicated significant concentrations of Petroleum hydrocarbons in <br /> • the coil vapor, with 'he apparent highest concentrations In the <br /> i' underground storage tank area. The relatively high concentra- <br /> tions of petroleum hydrocarbons Coll vapor lndicate-d a potential <br /> for groundwater contamination at the site. The SVCA data were <br /> used to determine the best locations for placement of groundwater <br /> moaltoring veils. <br /> Six groundwater monitoring veils were Installed on the site <br /> • during the week of 7 November 1988. <br /> Soil samples collected from <br /> tvO Of the well boreholes during drilling vore analyzed; they <br /> contained concentrations of total petroleum hydrocarbons (TP10 up <br /> to-3,3013- <br /> Two additional groundwater monitorin <br /> 9 w011s were Installed on the <br /> site during the week of 23 January 1999. <br /> C52/91918/text <br /> IN <br />