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n <br /> a. 6-M <br /> ONES <br /> C 4 <br /> H <br /> Introduction <br /> - Mobil Oil corporation is conducting site evaluations of ser- <br /> vice stations as part of a property transfer program with B.P. oil. <br /> r- TARGET Environmental Services, Inc. (TARGET) was contracted as part <br /> of this program to perform soil gas surveys to determine the pos- <br /> sible..presence and extent of subsurface hydrocarbon contamination <br /> at these sites. The field phase of the soil gas survey performed <br /> at Mobil Stivvice Station n10-297, 1403 Country Club Boulevard, <br /> Stockton, <br /> ,California, was conducted on March 11, 1989. <br /> i <br /> Detect.�bilit i <br /> The soil gas survey data presented in this report are the <br /> �,. result of precise sampling and measurement of contaminant concen- <br /> trations in the vadose zone. Analyte detection at a particular <br /> location is representative of vappr, dissolved, and/or liquid phase <br /> i contamination at that location. The presence of" detectable levels <br /> of target analytes in the vadose zone is dependent upon several <br /> - factors, including the presence of vapor-phase hydrocarbons or <br /> dissolved or liquid concentrations adequate to facilitate volatili- <br /> zation into the unsaturated zone. <br /> 2 <br />