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._, TANK CL091RE REPORT 2320 North Et Dorado Street, Stockton, California -- Aegis Project No. 09.049 Page 6 3.1 ,pre Tank Replacement site Assessment Results Report" summary Aegis submitted a "Pre-Tank Replacement Site Assessment Results Report" in March 1990. The scope of work and findings are summarized as follows: A total of fourteen soil borings were drilled adjacent to the former tank basin, in the vicinity of the product piping line near the dispensing islands and within the area of the proposed new tank location (Figure 2) . Results from laboratory analysis of soil samples obtained during the Pre-Tank Replacement Site Assessment indicated petroleum hydrocarbons were not present at detectable levels in soil samples collected from borings located near the underground storage tanks. Soil samples collected from borings nearest the product dispensing islands and within the proposed new tank location revealed detectable levels of toluene and total petroleum hydrocarbons (TPH) as diesel. TPH as gasoline and diesel were detected in soil samples collected from the borings near the product piping and dispensing islands. 3.2 Tank Closure Three underground storage tanks and associated product lines were removed under the direction of the SJCEHD. Prior to removal of tanks, backfill material above and surrounding the upper portion of the tanks was removed. The excavated soil was screened for the presence of organic vapors and segregated accordingly. The material was stockpiled in two separate areas. The piles were located on the northwest corner of the property and immediately east of the excavated tank location. Soil samples were collected during excavation according to Regional Water Quality Control Board Guidelines and SJCEHD requirements. The results of laboratory analyses of soil samples collected from both the former and new tank locations are summarized in Table 2. Laboratory reports and chain-of-custody forms are included in Appendix A. Sampling and analyses were performed according to the methods presented in Appendix B. Sample identification numbers presented in Table 2 are referenced to the sample locations depicted in Figures 3 and 4.