Laserfiche WebLink
June 1, 1988 AGS Job No. 038032-2 <br /> t � UNOCAL Service Station No. 5981, Stockton, California <br /> evaluate the vertical, extent of soil contamination and potential <br /> ground-water contamination. Two further mon�.toring wells will be <br /> �s <br /> placed along margins of the contamination in specific locations <br /> based on results of the soil vapor survey. <br /> SOIL VAPOR PROBE <br /> The Applied GeoSystems soil vapor probe is designed to obtain <br /> relative measurements of hydrocarbon concentrations in the soil <br /> by analyzing the soil vapor. Soil gas probes do not directly <br /> evaluate absolute contamination levels due to a high number of <br /> variables associated with subsurface soil conditions. The <br /> proposed investigation uses a system in which vapor samples are <br /> collected in a vial at the sampled depth by a vacuum process. <br /> The samples are then analyzed using a portable gas chromatograph. <br /> The vapor probe is pushed or driven to the desired depth, and.the <br /> sampling assembly containing an evacuated sample vial is lowered <br /> through the hollow center of the probe rod to collect a sample. <br /> After allowing sufficient time for collection, the sample <br /> assembly is withdrawn from the probe rod. The sample vial is <br /> removed from the sampling assembly, and a gas sample is withdrawn <br /> with a syringe and injected into the Photovac gas chromatograph. <br /> is <br /> 7 <br /> ,applied CRenSYSAMs <br /> f <br />