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Supplemental Investigation Report,Problem Assessment Report and Work Plan Cleana and Abatement Order No 5-00-707 EAI Pro ect No 1232 Under round Stora a Tanks Delta College had several underground storage tanks that stored among other substances waste oil, gasoline and diesel fuel EAI has been working with Delta College to determine the location and status of all USTs currently or formerly located on the campus This work is still ongoing and the results will be reported under separate cover as soon as they are available 2.2 Wards Site ' Wards operates an auto service center at 5400 Pacific Avenue Stockton California see P , ( Figures 1 and 2) 2 2 1 Removal of USTs Waste Oil UST ' On August 28, 1986, one 550-gallon capacity waste oil UST was removed from the Wards site (see Figure 3) One soil sample was collected from beneath the UST by Canonie Environmental Services Corp (Canonie) and tested for total petroleum hydrocarbons (TPH) by EPA Method 8015, purgeable aromatics by EPA Method 8020, purgeable halocarbons by EPA Method 8010, and polychlorinated biphenyls (PCBs) by EPA Method 8080 No TPH, purgeable aromatics or PCBs were detected in the sample Trichlorofluoromethane (0 05 parts per million [ppm]) was the only purgeable halocarbon detected Based on these testing results, no additional assessment activities were required in this area of the Wards site Bulk Oil USTs On June 22, 1988, four bulk USTs (two 1,000-gallon and two 500-gallon capacity) were removed from the Wards site (see Figure 3) Two soil samples were collected from beneath each UST by Canonie and tested for TPH, and benzene, toluene, xylenes and ethylbenzene (BTXE) No TPH or BTXE were detected in any of the soil samples tested Based on these testing results, no additional assessment activities are required in this area of the Wards site Gasoline USTs ' On June 26, 1986, two 10,000-gallon capacity gasoline USTs were removed from the Wards site (see Figure 3) These USTs were used to store regular and unleaded gasoline The ' underground product lines were triple rinsed, stubbed and abandoned in place A concrete slab on which the USTs were located was also abandoned in place 2 2 2 Assessmenals In May 1988, A D Selditch & Associates, Inc (ADS) drilled and sampled five borings on the Wards site to determine whether any release had occurred in the former vicinity of the gasoline USTs (see Figure 3) Four of the borings (Borings 1 through 4) were located in the area of the BS 1232P IRW WP -3- ENVIRONMENTAL AUDIT, INC