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1 Report of Investigation Former Underground Storage Tanks 3105 South El Dorado Street Stockton California Sierra-Pacific Project No 96-620 01 prepared by the California Regional Water Quality Control Board The results of the laboratory analyses on three ground-water samples are presented in table form in Table 2,below, in graphical form on Figure 7, and as complete laboratory data on the laboratory data sheets in Appendix A 1 ' Total petroleum hydrocarbons, quantified as gasoline (TPH-g) were found in each of the three soil samples submitted for analysis, at concentrations of from 157 to 361 ppm Benzene results were vaned, ' with 273 ppm in B-3, and 15 and 9 4 ppm in B-4 and MW-2, respectively Toluene and ethylbenzene were detected only in B-3, at concentrations of 1 5 and 0 8 ppm, respectively Xylenes were found in ' B-3 and MW-2, at concentrations of 3 5 and 1 3 ppm, respectively MTBE was found in all three ground-water samples, at concentrations of from 925 to 1,590 ppm Due to the former presence of a waste oil tank at this site, the ground-water sample from MW-2 was also analyzed for total petroleum hydrocarbons quantified as motor oil, which was reported as not detected Table 2. Ground Water Sample Results Sample Total Number Benzene ' Toluene Ethylbenzene Xylenes MTBE TPH-g TPH-o ' B-3V 273 (10)' 15 (0 5) 0 8 (0 5) 3 5 (0 5) 925 (10) 359 (50) NA B-4Wz 1 5 (0 5) ND (0 5) ND (0 5) ND (0 5) 1,580 (50) 157 (50) NA 109971 9 4 (0 5) ND(0 5) ND (0 5) 13 (0 5) 1,590(50) 361 (50) ND (500) (MW-2) ' Notes 1 All data in this table are in parts per billion (ppb) ' 2 This was a grab sample from an open soil boring 3 Laboratory detection limits (in ppb) are indicated in parentheses ND = Not detected at or above the indicated laboratory detection limit ' NA =Not analyzed Sierra-Pacific Groundwater Consultants, Inc 11