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7kadwell&Rollo <br /> • <br /> 3. Soil Excavation <br /> 4. Pump and treat contaminated groundwater <br /> 5. Soil vapor extraction <br /> 6. Bioremediation <br /> 4.0 DETAILED ALTERNATIVES ANALYSIS <br /> The remedial alternatives have been subdivided by media, provides individual alternative <br /> analyses for soil and groundwater alternatives. <br /> 4.1 Soil Remedial Alternatives Initial Screening <br /> The initial screening for soil remedial alternatives produced four general response actions <br /> • (Tables 3 and 4). The No-Action Alternative was considered to reflect the current conditions at <br /> OU 1 and portions of OU 2. <br /> 4.1.1 Containment <br /> Two remedial alternatives were selected for Containment. Capping with engineered material <br /> (asphalt/concrete, imported fill, and synthetic liner) is both technically possible and protective, as <br /> is excavation and on-site reimplacement of the contaminated soil with subsequent filling and <br /> capping. Capital and operations and maintenance costs are low to moderate. Both actions were <br /> retained for further evaluation. <br /> 4.1.2 Removal <br /> Source area excavation involving the off-site removal of contaminated soil is technically feasible <br /> and protective, with low to moderate capital and operations and maintenance costs. Removal <br /> was retained for further evaluation. <br /> • <br /> 21 <br /> 25970318.PGS 15 November 2000 <br />