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1 <br /> action would be taken to remediate the site This passive response <br /> would employ natural biodegradation as the only treatment. <br /> This alternative could be easily implemented as no action is required. <br /> It would also be the least expensive alternative. However, this <br /> alternative would not effectively remediate ground water and would <br />' not satisfy the timeliness criterion Therefore, the no action <br /> alternative is not considered an appropriate alternative. <br /> 1 <br /> Preferred Alternatives <br />' The results of the engineering evaluation identified preferred <br /> alternatives for the remediation of both hydrocarbon-containing soils <br /> and ground water at the site. For site soils, the preferred alternative <br /> is excavation and on-site aeration of hydrocarbon-containing sods <br /> This alternative is favored because it would be an effective and easily <br /> implemented remedial alternative for site soils In addition, on-site <br /> aeration would be very cost-effective and could be implemented in a <br /> timely manner <br /> For ground water, the preferred alternative entails the extraction of a <br /> fixed volume of hydrocarbon-containing ground water from both <br /> sites, aeration of the extracted water, and discharge to the sewer. If <br /> r necessary, the extracted ground water could first be polished with <br /> liquid-phase activated carbon prior to discharge to the sewer This <br /> alternative would be cost-effective and easily implemented at the site. <br />' An alternative secondary remedial option for the treatment of both <br /> soils and ground water would involve ground water extraction <br />' combined with in situ bioremediation of sods. For this option, a fixed <br /> volume of ground water would be extracted, aerated, inoculated with <br /> nutrients, and reinfected into the hydrocarbon-containing soils via <br /> 1 an infiltration gallery to provide enhanced in situ bioremediation of <br /> sods. Hydrocarbon-containing soils would not be excavated as part of <br /> this alternative <br /> 1 <br /> 7-9 <br />