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a <br /> Woodward-Clyde Consulza-!-'[S <br /> Table 7 Continued <br /> Technology Description Advantage Disadvantages <br /> E,xWip n immobilization of Soil can be fixed in <br /> i ethnology is relatively <br /> contaminants by use of place without nP":,' for immature. Dangealf <br /> appropriate chemicals. excavatio_ injecting a p <br /> otentiContaminants are groundwater Possibility of the pollutant. <br /> rendered insoluble to formation of toxic by- <br /> prevent leaching. products. Need for <br /> numerous closely <br /> spaced wells since <br /> fixation process will <br /> lower hydraulic <br /> conductivities. <br /> Experience has been <br /> largely limited tU <br /> fixation of metals and <br /> highly toxic organics. <br /> Application to <br /> hydrocarbon-containing <br /> soil is questionable. <br /> �'""� SoilSoit Washing Flushing of Allows cleaning of the Addition of flushing <br /> f solution requires <br /> contamination from soil soil in situ. careful management. <br /> using appropriate Good knowledge of <br /> solutions (e.g. subsurface is needed. <br /> surfactants). Elutriale inefficient for <br /> is treated before petroleum <br /> discharge, hydrocarbons. <br /> Significant amount of i <br /> hydrocarbon left after <br /> treatment. Possibility <br /> of introducing a <br /> potential poil�titant into <br /> groundwater. Field <br /> experience is limited. <br /> Requires treatment of <br /> large volume of <br /> elutriate. Surfactant <br /> must be treated at high <br /> levels of hydrocarbon <br /> contamination. <br /> i <br /> i <br /> 22 <br />