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f <br /> the levels indicated in MW-1. This potentially means that the <br /> M <br /> contaminant plume in the groundwater appears to be slightly l <br /> larger than the soil contaminant plume. This is readily E <br /> expected because of two factors. First, the definition of <br /> f <br /> T 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 v <br /> y 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 /> 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 /> ' 1 <br /> } <br /> a <br /> Page 37 <br />. 74 <br />