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TABLE 1 CONCENTRATIONS OF HYDROCARBON CONSTITUENTS IN SOIL VAPOR AT CHEVRON PROPERTY 9-0265, I-5 AT <br /> LATHROP ROAD, SIOCKTON, CALIFORNIA, 30 JUNE 1988 <br /> Peaks Total <br /> Not Volatile <br /> Peaks Prior Ethyl- Otherwise Hydro- <br /> Sample Depth to Benz ea Benzene Toluene o-Xylene m,p-Xylene benzene Identifed carbons <br /> Location (ft) (ppm)b (ppm ) (ppm) (ppm) (ppm) (ppm) (ppm), (PIS) <br /> A2 3 2 <1 <1 <1 <1 <1 <1 2 <br /> A3/A 5.5 <1 <1 <1 <1 <1 <1 <1 1 <br /> A3/B 8 4 <1 <1 <1 <1 <1 <1 4 <br /> A4 5.5 2 <1 <1 <1 <1 <1 <1 2 <br /> A5 5.5 4 <1 <1 <1 <1 <1 <1 5 <br /> Bl/A 3 1 <1 <1 <1 <1 <1 <1 1 <br /> B1/B 8 <1 <1 <1 <1 <1 <1 <1 <1 <br /> B1/C 13 1 <1 <1 <1 <1 <1 <1 1 <br /> B2/A 3 1 <1 <1 <1 <1 <1 <1 1 <br /> B2/B 8 <1 <1 <1 <1 <1 <1 <1 2 <br /> B4 5.5 3 <1 <1 <1 <1 <1 <1 3 <br /> C1 5.5 <1 <1 <1 <1 <1 <1 <1 <1 <br /> C3 5.5 2 <1 <11 <1 <1 <1 <1 3 <br /> C4 5.5 1 <1 <1 <1 <1 <1 <1 3 <br /> C5 5.5 1 <1 <1 <1 <1 <1 <1 1 <br /> D2 5.5 1 <1 <1 <1 <1 <1 <1 1 <br /> D4 5.5 <1 <1 <1 <1 <1 <1 <1 1 <br /> E1 5.5 <2 <1 <1 <1 <1 <1 <1 <2 <br /> E3 5.5 6 <1 <1 <1 <1 <1 <1 6 <br /> E4/A 5.5 <1 <1 <1 <1 <1 <1 <1 <1 <br /> E4/B 8 2 <1 <1 <1 <1 <1 <1 2 <br /> E5 5.5 <1 <1 <1 <1 <1 <1 <1 <1 <br /> a. Early peaks from blank data subtracted from total peaks prior to benzene. <br /> b. Quantification based on V-sec:ppm ratio for benzene (see text). <br /> c40/90625 <br />