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2.0 O'JTL IOF SOIL,GAS S[TRVEY <br /> The relative concentration and lateral extent of hydrocarbon <br /> constituents as •rxpor in soil has been found to correlate to hydrocarbon <br /> concentrations in ground water (Dc-ricc at al., 1987). Therefore, the soil <br /> gas survey is used to evaluate the lateral extent of volatile hydrocarbon <br /> contamination in both the soil and ground water. Absolute levels of <br /> hydrocarbon cowcentrations, however, man not be measured with this type of <br /> survey. <br /> The application of the soil gas survey to plume delineation is baled on <br /> the tendency of low moleew ar weight hydrocarbons to volatilize and migrate <br /> through the pore spacas of .soil. Variables that influence hydrocarbon <br /> movamynt in the soil include the physical and chemical properties of the <br /> organic contaminants, properties of the unsaturated zone, and the <br /> hydrogeologic properties of the site. Site-specific parameters may include <br /> the vapor pressure, water solubility, and concentration of the chemical; the <br /> pc.rosity, mo+sture content, and organic content of the site soil; and the <br /> flow direction and velocity of the groundwater. <br /> i ^ <br /> LD01.046 2 <br /> {r' <br /> Jr` <br />