Chloroorganic solvents, such as 1,1,1-trichloroethane (TCA), trichloroethylene (TCE) and tetra-chloroethylene (or perchloroethylene, PCE), have been found in many contaminated sites and groundwaters. The outward migration of these chemicals in saturated soils is largely dependent upon their interactions with the soil particles. In general, the adsorption of these volatile organic compounds (VOC) by most soils are only slight to moderate since plumes of the VOC’s have been detected quite far away from the initial sites of contamination. 1 , 2