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LFR Levine-Fricke Reduction of Toxicity, Mobility, and Volume through Treatment. Toxicity and mobility of the metals-affected soil would likely be reduced by treatment in this alternative. The toxicity and mobility of the pyrolytic oil-affected soil would not be reduced through treatment and there would be no reduction in the volume of affected soil through treatment. Short-Term Effectiveness. Removal of the source material would provide instant reduction of source contaminants and significant short-term effectiveness. Implementability. This alternative could be implemented, but would entail planning and coordinating with an additional remediation contractor, thus adding time to the project schedule. Separation of pyrolytic oil-affected soil for transportation versus metals- affected soil for on-site treatment could be difficult. Stockpiling soil on-site before treatment would not require obtaining permits from the DTSC because the Site is a Corrective Action Management Unit(CAMU). Cost. The total capital cost for Alternative 4 is considered relatively high. These costs include excavation activities, soil treatment, and disposal. The treatment mechanisms would reduce the cost of disposing of the waste soil, but the time to mitigate the Site would increase. The cost savings might not be significant enough to justify the on site treatment. No long-term operations and maintenance would be necessary. The present worth of operation and maintenance costs, including 30 years of monitoring and reporting, is relatively moderate to high. The total net present worth of Alternative 1 is moderate to high. Regulatory Acceptance. This alternative would be accepted by DTSC and RWQCB because it would actively remediate pyrolytic oil-and metals-affected soil. Community Acceptance. The community may accept this alternative on the basis of input received to date from the public on the recently completed, neighboring, and similar project named the Westley Tire Fire Site (CIWMB, 2003). However, the increased time(approximately 8 weeks) spent on the project site may affect public opinion. An increase in truck traffic on the transportation route might be necessary due to the addition of stabilizing material. Alternative 5-Excavation and Off-Site Disposal of Pyrolytic Oil-Affected Soil and Excavation, On-Site Stabilization, and Replacement of Metals-Affected Soil. This alternative would involve excavating the pyrolytic oil-affected soil for off-site disposal and excavating metals-affected soil for on-site treatment and replacement. The treatment would involve mechanically mixing the affected soil with a cement base compound to stabilize the soil for on-site placement. Overall Protection of Human Health and the Environment. Excavation, treatment, and soil replacement would offer a relatively moderate degree of protection to human health and the environment. Testing of the stabilized soil would be required to demonstrate that the treatment was effective in reducing leachable concentrations of metals. The Page 14 Final_RAP_Tracy_9.18.03(final).doc