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V <br /> Report of Soil Vapor Survey January 12, 1989 <br /> t UNOCAL Station No. 6981, Stockton, California AGS 38032-2V <br /> Description of chromatograph and Method of Analysis <br /> A 0.10-milliliter vapor sample was withdrawn from the sample vial <br /> using a 0.10-milliliter syringe and injected into a Photovac <br /> 10570 portable gas chromatograph for analysis. The instrument is <br /> a dual-column, manual-injection chromatograph with a photo <br /> ionization detector that is sensitive to concentrations of <br /> hydrocarbon constituents in the range of parts per billion. <br /> The analytical equipment used in this survey is housed in Applied <br /> GeeSystems' Mobile Soil Vapor Laboratory, which Frovides a clean, <br /> temperature-controlled environment. The detection limit for the <br /> chromatograph was set by verifying linearity and peak resolution <br /> with standard gas containing equal concentrations (1 part per <br /> million [ppm)) benzene, toluene, and total. xylene isomers, which <br /> are associated with the higher volatilehase of <br /> p gasoline. <br /> Before analyzing the vapor- samples, the chromatograph was <br /> calibrated with a standard gas containing equal concentrations <br /> (20 ppm). of benzene, tolz!ene, and total xylene isomers. <br /> RESULTS OF SOIL VAPOR ANALYSES <br /> Results of the soil vapor survey are measured in parts per <br /> million of hydrocarbon vapor contained in the soil vapor and <br /> 6 <br /> f~ <br /> ,a, PIled iGOOSY OMS <br />