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' appropriate as part of other alternatives, but would not be appropriate as a separate remedial alternative for the site Q�Slte Ex Situ Soil Aeration ' This alternative would consist of excavating the affected soils and removing the volatile hydrocarbons from the soil via aeration. The excavated soils would be spread over a treatment area at a depth of ' 6-to-8 inches, covered, and allowed to dry After the sols are dry, agricultural equipment would then be used to mix the soils, allowing the hydrocarbons to volatilize After the aeration is complete, the ' treated sods could be backfilled into the excavation. This treatment alternative is an effective and proven method of ' treating hydrocarbon-containing sods The technology is also easily implemented because it only requires conventional construction equipment. In addition, the area of the site can easily accommodate ' the treatment process. The affected site soils consist of semi- consolidated clays winch may require several weeks or months to dry before aeration could proceed. The soil drying process should not ' present a significant implementation problem given the hot summer days characteristic of the Central Valley Approval from the San Joaquin Valley Unified Air Pollution Control District (APCD) would be required prior to implementation of on-site soil aeration. APCD regulations restrict the rates of volatile hydrocarbon emissions from the stockpile based on the concentration ' levels present in the soils. According to APCD requirements, if the concentration of volatile hydrocarbons in the soils is less than 5,000 mg/kg (ppm), volatiles can be aerated directly to the ' atmosphere. No collection and/or treatment of the volatilized hydrocarbons would be necessary Since investigation data have demonstrated that hydrocarbon-containing sods at both Sites #1 and ' #2 are well below 5,000 ppm, on-site soil aeration would be a cost- effective and easily implemented remedial alternative. To meet APCD requirements, it would still be necessary to aerate discrete ' portions of the stockpile over time to control the rate of volatile emissions. ' Off-Site&W Treatment This alternative would involve excavation and transportation of the ' affected soils to an off-site treatment facility. The excavated area would then be backfilled with imported fill. The soils would be treated to remove the hydrocarbon constituents and allow either reuse or disposal of the clean soil. Examples of off-site treatment include recycling of the hydrocarbon-containing soil as a raw material in the production of road base material, low temperature 7-3