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J <br /> TABLE 6 CONCENTRATIONS OF HYDROCARBON CONSTITUENTS OBTAINED FROM SOIL VAPOR PROBES,FORT PUR <br /> EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALTFORNIA,28 AND 29 MARCH 1990 <br /> Total <br /> Unidentified Volatile <br /> Vacuum Peaks Prior Ethyl- Total Peaks After Hydro- <br /> Sample Depth Vacuum Release to Benzenea Benzene Toluene benzene Xylenes benzene carbons <br /> -t nation (ft) -Ain,1-1P,) min WPM) —(Rpm) (ppm) (ppM) -(Rpm) o mlh_ -WPMIC <br /> VPl/A 15 3 <1 <1 TR TR <1 <1 TR TR <br /> VPI/B17.8 17 <1 <1 TR 1.1 <1 TR TR 1.1 <br /> VP2 5 24 1.2 <1 <1 <1 <1 <I <1 <1 <br /> VP3 15 24 <1 10 TR 1.2 <1 TR 3 14 <br /> VP4 5 17 <1 <1 <1 <1 <1 <1 <1 <1 <br /> VP5 5.5 22 12 <1 <1 <1 <1 <I <1 <1 <br /> VPb 5.5 18 <1 <1 <1 <1 <1 cl <1 <1 <br /> VP7� 4 28 >60 -- -_ -- -- <br /> VP8 4 22 <I <1 <1 <1 <1 <1 <1 <1 <br /> VP9 4.5 15 <1 <1 <I <1 <1 <1 <1 <br /> a. Quantification based on calibration factor for pentane. Early peaks from blank data subtracted from sample values. <br /> b. Quantification based on average calibration factor for n-pentane,n-hexane,iso-octane, benzene,toluene,ethyibenzene,and <br /> o,m,p-xylenes. <br /> C. Summation of all detected constituents. <br /> * Sample not analyzed due to long vacuum release time. <br /> TR Indicates a trace was observed below detection limit. <br /> m30JexxonM1 42M <br />