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d r- <br /> .. 4.0 RESULTS <br /> Fgsu?ts of the soil gas turvey indicate that the highest <br /> concentriltirns of benzene, Lolue-e, and xylene (ETX compounds) are in tho <br /> vicinity of the tank excavation backfill, adjacent to tho laadia$ ramp, and <br /> appear to migrate out radially away from the excavation backfill. The data <br /> suggests that constituent concentrations decrease with distance from the <br /> backfill and tend to migrrte slightly in what appears ro be a westerly <br /> d{reeCion. Constituents with shorter retention times thar. benzene were <br /> a detected around the paint shop during the survey. These unidentified <br /> constituents could be chlorinated solvents. <br /> Table 1 summarizes the resul�s of the survey and Figures 3 through 5 <br /> are interpretations of measured benzene, toluene and xylene vapor <br /> concentrations in the subsurface at a depth of six to fifteen feet. The <br /> 4bsence of Long-chained hydrocarbsn compounds does not preclude their <br /> existence in regions inaccessible to the soil vapor probes or in the ground <br /> Water itself. Appendix A contains output from the Pbotovac gas <br /> chromatograph. <br /> r.T <br /> 1, <br /> i�4 <br /> 4. <br /> rr <br /> LD01.046 4 <br /> [IM 110 NEW= <br /> - SJp <br />