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SITE CLOSURE REQUEST REPORT Former Exxon Service Station No.7-3330 3128 west Benjamin Holt Drive Stockton,California Delta Project No. D093-810 Page 6 Soil samples were collected beneath each end of the gasoline USTs and from beneath the associated product distribution lines. Soil sample locations are shown in Figure 4. Soil samples were submitted for BTEX (EPA Method 8020), TPH as gasoline (EPA Method 8015 Modified), and total lead (EPA Method 60101200.7 ICP) analysis. Samples which contained detectable concentrations of total lead were subsequently sampled for organic lead using California Department of Health Services Method 338. Soil sample depths and analytical results are summarized in Table 4. Soil samples were collected beneath the location of two hoists excavated from the former building (Figure 4). The samples collected from beneath the hoists were analyzed for TPH using EPA Method 418.1 (Table 4). Soil samples collected in October 1991, from beneath the used oil tank (Figure 4) were analyzed for cadmium, chromium, hexavalent chromium, nickel, lead, and zinc(EPA Method 6010), TPH as gasoline, and TPH as diesel (EPA Method 8015 Modified). Soil sample depths and soil sample analytical results for samples collected from beneath the used oil tank are summarized in Table 5. The amount of soil excavated during the UST and product line removal activities conducted in October 1991 was estimated to be approximately 450 and 500 cubic yards. The limits of the excavations are shown in Figure 4. 2.7 Overexcavation Activities In November 1991, monitoring wells MW-1 and MW-2 were properly destroyed by a licensed driller under the supervision of Artesian prior to overexcavating additional soil. Following the well destruction, Artesian supervised the excavation of a reported 1,296 cubic yards of soil in April and May 1992. The limits of the overexcavations are shown in Figure 5. Confirmation soil samples were collected at the limits of the excavations at the locations shown in Figure 5. Confirmation soil samples collected at the limits of the excavations of the former tank and line locations were analyzed for BTEX, TPH as gasoline (EPA Method 802018015), and lead (EPA Method 60101200.7 ICP). Soil sample analytical results of l samples collected from the former tank basin and product line areas are summarized in Table 4. The RPT001.810