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PRELIMINARY EVALUATION OF REMEDIAL ALTERNATIVES <br /> Our environmental assessment at the site indicates that an undetermined volume of fuel <br /> hydrocarbons has been released into the subsurface due to a leak in an underground storage <br /> tank. Additional leakage has been prevented by removal of the leaky tank. The assessment <br /> r; <br /> also indicates that: <br /> o Gasoline is the dominant hydrocarbon in soil and ground water underlying the <br /> site. <br /> r� <br /> o Soil containing residual gasoline hydrocarbons is restricted to the area <br /> underlying the former leaky tank and extends to the ground-water surface at <br /> approximc.tely 38 feet below surface grade. Based on the results of laboratory <br /> analyses of soil samples from borings B-4 through 13-7, hydrocarbonous soil <br /> r°y is restricted to the area within a 30-foot radius of the former tank. Based on <br /> these dimensions,the maximum volume of hydrocarbonous soil underlying the <br /> site is hpproximately ,4,000 cubic yards; the actual volume is probably <br /> significantly less. The hydrocarbonous soil consists mostly of clay and silt. <br /> with minor fine-grained sand. <br /> o Ground water underlying the western portion of the site contains dissolved <br /> gasoline hydrocarbons. Floating gasoline has not been observed at the site. <br /> Soil and groundwater remediation techniques that may be applicable at the site are briefly <br /> described below. The descriptions do not constitute recommendations. A feasibility study <br /> u <br /> is necessary to evaluate the most appropriate and cost-effective remediation method for the <br /> site and to develop detailed cost estimates. <br /> Soil Remediation <br /> Remediation of soil containing fuel hydrocarbons can generally be accomplished by removal <br /> and disposal or treatment of the affected soil, or by in situ methods. including vapor <br /> Ajgo/%d Ge®Systeflys <br />