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r - <br /> as gasoline was detected in three samples from NIW-7 at depths of 25 feet (58 ppm), 30 feet <br /> f (71 ppm) and 35 feet (1 2 ppm) Low concentrations of TPH as diesel was also detected <br /> rin the 25-foot and 30-foot samples from MW-7 <br /> Benzene was detected in boring B15 at a depth of 30 feet (0 023 ppm) and in MW-7 at a <br /> depth of 35 feet (0 34 ppm)_ Toluene was detected only in MW-7 at a depth of 30 feet <br /> (0 27 ppm) Ethylbenzene was detected in MW-7 at depths of 25, 30 and 35 feet Xylenes <br /> were detected in samples 5rom B15 at 30 feet and MW-7 at depths 25 and 30 feet <br /> r Analytical results of soil samples are summarized in Table 1 The laboratory report and <br /> chain-of-custody are included in Appendix C <br /> rTABLE 1 <br /> ANALYTICAL RESULTS OF SOIL SAMPLES <br /> r - Nomellini Construction Co. <br /> 1045 West Charter Way, Stockton, California <br /> (nig/kg) <br /> rSample TPH as TPH as TPH as Ethyl- <br /> Location/ gasoline diesel motor Benzene Toluene benzene Xylenes <br /> r Depth oil <br /> MW-9-20' ND NA NA ND ND ND ND <br /> MW-9-30' ND NA NA ND IT'D ND ND <br /> PP <br /> B15-20' ND NA NA ND ND ND ND <br /> r B15-25' ND ND ND ND ND ND ND <br /> B15-30' ND ND ND 0 023 ND ND 0 018 <br /> rMW-8-25' ND NA NA ND ND ND ND <br /> MW-8-30' ND NA NA ND ND ND ND <br /> rMW-7-20' ND NA NA ND ND ND ND <br /> MVV-7-25' 58 62 ND ND ND 0 078 1 1 <br /> rMW-7-30' 71 24 ND ND 027 046 22 <br /> MW-7-35' 12 ND ND 034 ND 00095 ND <br /> mj;A& = parts per million ppm <br /> ND = not detected, NA = not analyzed <br /> 4.4 Relative Groundwater Elevation and Gradient <br /> The groundwater elevation in each well was calculated by subtracting the depth-to-water <br /> from the surveyed casing elevation (Table 2) Groundwater elevation at the site ranges from <br /> -24 79 to -25 98 feet Groundwater has irsen an average of 0 19 feet since the February 1993 <br /> 6eeloynt Audd s<�1— 7 <br /> SG9111¢102&02AW N-16,QW12 91 <br /> r <br />