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for site assessments because many of the chemicals most fre- <br /> quently found at contaminated sites are volatile, and thus poten- <br /> tially detectable by SVCA. These chemicals include: trichloro- <br /> ethylene, toluene, benzene, chloroform, tetrachloroethylene, <br /> 1 , 1 , 1 -trichloroethane, ethylbenzene, xylenes, methylene chloride, <br /> and trans-1 , 2-dichloroethylene (Marrin and Kerfoot 1988 ) . <br /> c40/90265 4 <br />