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4.3 Analytical Results of Soil Samples ' A total of thirty soil samples were analyzed for TPH as gasoline and BTE&X by Pan-Ag TPH as gasoline was detected at concentrations as great as 6,200 ppm (B2-20 and B2-40) No TPH as gas was detected in samples from B1, 133, B6, MW-1 or MW-2 Benzene, toluene, ethylbenzene and xylene were detected at concentrations as great as 70 ppm (B2- 40), 630 ppm (132-20), 240 ppm (112-20) and 1,120 ppm (B2-20), respectively ' Seventeen samples were analyzed for total lead Lead was detected only in three samples at concentrations to 16 8 ppm The analytical results are summarized in Table 3 The laboratory reports and chain-of-custody are included in Appendix C ' 4.4 Relative Groundwater Elevation and Gradient ' The relative elevation of the groundwater in each well was calculated by subtracting groundwater depth from the surveyed casing elevation (Table 1) The groundwater gradient was calculated to be 0.002 ft/ft directed N 77° E (Figure 5) ' 4.5 Analytical Results of Groundwater Samples ' TPH as gasoline was detected in groundwater samples from MW-1, MW-2 and MW-3 at concentrations of 150 AgIL (parts per billion, ppb), 2,600 ppb and 11,000 ppb, respectively BTE&X were detected in each well at concentrations up to 2,200 ppb (benzene, MW-3). No lead was detected in any of the water samples The analytical results of all groundwater samples are summarized in Table 2 The laboratory reports and chains-of-custody are included in Appendix C TABLE 2 ANALYTICAL RESULTS OF WATER SAMPLES Top Filling Station 101 S. Wilson Way, Stockton, California I µg/L=parts per billion (ppb) Sample ID Lead TPH as I Gasoline Benzene Toluene benzene Xylene MW-1/1-17-95 ND 150 5 16 0 7 16 MW-2/1-17-95 ND 2,600 120 79 130 47 MW-3/1-17-95 ND 11,000 2,200 1,900 500 2,000 ND a None Deiected a..&ysi w.ai S m w i.e S UP R66 Pl[SRl OW..1995 I