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the levels indicated in MW-1 This potentially means that the <br /> contaminant plume in the groundwater appears to be slightly <br /> larger than the soil contaminant plume. This is readily <br /> expected because of two factors . First, the definition of <br /> contamination for water is much more stringent than the <br /> applicable standards to soil contamination and secondly, the <br /> - water is a much greater transporter of contamination than <br /> diffusion properties of contaminants through soil . <br /> - The areal extent of contamination in the groundwater has not <br /> been adequately defined. This may be investigated and <br /> established as part of the remedial action. <br /> The presence of the water table at approximately 18 feet <br /> - below ground surface plays a very important part in reducing the <br /> downward migration of petroleum products. The BTEX components of <br /> petroleum, for example have a solubility in water of only a few <br /> W tenths of a percent, the rest remains immiscible and as such will <br /> float on the aquifer. This reduces the ultimate depth of soils <br /> _ that may be contaminated and require remediation. <br /> Page 37 <br /> 74 <br />