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a <br /> FIN <br /> r•. <br /> „s+1 <br /> u.m VotAc_vwcl rwrisurl, CA 9.3599 Fl 1 rl 651.1906 <br /> Oft <br /> January 12, 1.989 <br /> AGS 38032-2V <br /> Mr. Tim Ross <br /> uNOCAL Corporation <br /> 2175 north California Boulevard <br /> Suite 650 <br /> Walnut Crack, California 94596 <br /> Subject: SxecutiV* Sugary of Report No. 38012-7.V, Soil Vapor <br /> Survey at UNOCAL Service Station go. 6981, 4707 Pacific <br /> A,venuo, Stockton, California. <br /> 94 <br /> Mr. Ross: <br /> 1 This report describes the results of a soil vapor survey tnat was <br /> performed at the above-referenced mite on December 4, 1988, by <br /> Applied GooSystems. A survey was requested by UNOCAL Corporation <br /> to help identify and delineate possible subsurface contamination. <br /> Data from this types of study are useful in identifying and <br /> delineating the subsurface dirtlribution of contamination; <br /> however, this type of survay cannot: measure absolute levels of <br /> sail or gas contamination. <br /> Field work included use o. Applied CeloSystems' Mobile: Soil Vapor <br /> Laboratory to collect and analyse soil vapor at 13 sampling <br /> locations at depths rangin:, from 7 to 28 fcct. Results of the <br /> soil vapor analyses revealed nondetectable concentrations of <br /> benzene contamination in 12 of the 13 probe locations. in vapor <br /> probe location VP-7, near the southwest corner of the site, the <br /> level of benzene was only slightly over, the detection limit. <br /> Toluene and total xylene isomers were nondetectable at the 13 <br /> vapor probe locations. <br /> Please do not hesitate to call if you have any questions <br /> regarding the content of this report. <br /> sincerely, <br /> Appliel Gi-aSystems <br /> 4 IA <br /> Y <br /> Stanley S. Thompson <br /> Staff Geologist <br /> ar <br />