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Report of Soil Vapor survey January 12, 1989 <br /> UNOCAL Station No. 5981, Stockton, C-+lifornia AGS 38032-2V <br /> are presented in fable 1. Interpretation of data resulting from <br /> this survey are presented on Plate P-3 as relative concentrations <br /> ti <br /> (in parts per million) of benzene, tolune, and total xylene <br /> isomers. Results of the soil vapor analyses revealed that there <br /> is little detectable contamination extending offsite. With the <br /> exception of the sample collected from VP-7, near the southwest <br /> corner of the site, no detectable levels of benzene, toluene, or <br /> total xylene isomers were found in any of the probe locations. <br /> Two parts per million of benzene ::cre detected at 12 feet in <br /> VP-7. The low level of ben_,ene and the absence of toluene and <br /> xylene in the sample may indicate that the vapors measured are <br /> the result of vapor phase transport rather than extensive <br /> contamination of the underlying soil or ground water. <br /> 00 RECOMMENDATXONS <br /> We recommend that the rzlative contaminant concentrations <br /> obtained in this study be compared to concentrations obtained by <br /> analyzing soil and ground water using methods approved by the <br /> Environmental Protection Agency. This work should include <br /> drilling three soil borings and installing ground-water <br /> monitoring wells as described in Applied GeoSystems Work Plan Na. . <br /> 38032-2, dated July 8, 1983. One monitoring well should be <br /> 7 <br /> A,010118d GOOSYSAMS <br />