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5 <br /> F� <br /> r:\proj—\5130\1yi---P <br /> 3.0 CONCLUSIONS AND RECOMMENDA'T'IONS <br /> Analytical results from soil samples taken horn the former tank a-ea indicate that the <br /> overexcavation activities at the Thomas Yard were successful in removing soil containing <br /> hydrocarbons. Results of soil boring-IM-1 indicate that hydrocarbons have riot migrated <br /> from the former tank area into the soil beneath the building. Because the water table is <br /> approximately 60 feet beneath the deepest hydrocarbons found in the sail, ground water <br /> beneath the site has probably not been affected. <br /> FSE recommends this site for case closure pending the removal or remediation of the <br /> approximately 800 cubic yards of soil containing hydrocarbons taken from the excavation <br /> and stockpiled on site. Several soil disposition options are being considered,including: <br /> 1) Land-farming on site <br /> 2) Chemical (hydrogen peroxide) treatment on site <br /> 3) Class II or Class Ill landfill disposal <br /> Cost, hydrocarbon concentration level, available space on site, and San Joaquin County <br /> regulations are some of the factors involved in choosing the best disposal option. <br /> ESE wi!l discuss these options with Delta Truck and San Joaquin County regulatory <br /> officials. <br /> 6 <br /> n <br />