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u u 0 r: CI' r u 0 I I Mr. Michael Walton Walton Engineering, Inc. October 16, 2003 The laboratory results of the soil sample analyses indicated that only slightly elevated concentrations of the fuel oxygenates MtBE and tBA were present in one soil sample collected from beneath the former product lines (S4 -PL 1 in Table 2). In addition, low concentrations of TPHg and total xylenes were detected in the soil sample composites collected from the soil stockpiles generated during the fuel system renovation work (see Soil Stockpiles in Table 2). According to these laboratory data, significant soil contamination had not occurred beneath the former fuel dispensers or underground product lines. The laboratory report for these soil sample analyses is presented in Appendix A of this report. Based on the field evidence and laboratory analytical data of the soil samples collected from beneath the former underground storage tank, fuel dispensers and underground product lines at the site, it appeared that significant soil contamination had not occurred. Only slightly elevated concentrations of diesel fuel -range hydrocarbons, the fuel oxygenates MtBE and tBA and four of the assessment GRA MOD ENTIMMffNTA_L Grayland 022-370.fdr 5 TABLE 2 LABORATORY RESULTS OF SOIL SAMPLE ANALYSES FUEL DISPENSER REMOVAL 15 GRANT LINE ROAD, TRACY, CALIFORNIA ..................... :..:.,............................................,...............................,.......................... : - < <> Fuel Dispensers S-3-FD1 <1.0 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 S-3-FD2 <1.0 <0.005 <0.005 <1.005 <0.005 <0.005 <0.005 <0.005 S-3-FD3 <1.0 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 S-3-FD4 <1.0 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 S-3-FD5 <1.0 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 Product Lines S4-PLl <1.0 <0.005 <0.005 <0.005 <0.005 0.44 0.23 <0.005 S-4 PL2 <1.0 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 S-4-PL3 <1.0 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 S4-PL4 <1.0 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 Soil Stockpiles SP2a-d 1.4 <0.005 <0.005 <0.005 0.13 <0.005 na na SP2e-h 2.0 <0.005 <0.005 <0.005 0.0084 <0.005 na na Laboratory results of soil samples are reported m milligram.%%logram (parts per million) TPHg = Total Petroleum Hydrocarbons in the range of gasoline B = Benzene T = Toluene E = Ethylbenzene X = Total Xylenes MtBE = Methyl t -Butyl Ether tBA = t -butanol Other Oxys = di isopropyl ether (dIPE), ethyl t4ngl ether (EtBE) and t -amyl methyl ether (tAME) < = Less than the laboratory method reporting limit na =not anal 11 Based on the field evidence and laboratory analytical data of the soil samples collected from beneath the former underground storage tank, fuel dispensers and underground product lines at the site, it appeared that significant soil contamination had not occurred. Only slightly elevated concentrations of diesel fuel -range hydrocarbons, the fuel oxygenates MtBE and tBA and four of the assessment GRA MOD ENTIMMffNTA_L Grayland 022-370.fdr 5