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14 December 1992 <br /> (GeoAudit CV55-59E2-1. 32) <br /> Page 2 of 2 <br /> 5 <br /> Previous analysis of the contaminated soil by the California Waste <br /> Extraction Test (WET) method indicated that the hydrocarbons are <br /> not leachable (see Geological Audit report dated 18 October 1992) . <br /> Moreover, the concrete walls and floor of the heating oil vault are <br /> several inches thick, making it an ideal containment vessel. In <br /> addition, because the barrels contain a total soil volume of <br /> approximately 128 cubic feet, and the floor area of the vault <br /> measures 25 feet x 10 feet (250 square feet) , the soil would form <br /> a layer only 6 inches thick on- the floor of _the vault if evenly <br /> spread out. This thin soil layer would then be covered by a layer <br /> of concrete 7. 5 feet thick, effectively eliminating any possibility <br /> of future leaching of hydrocarbons from the vault. Geological Audit <br /> therefore concludes that encasing the drummed soil in the vault is <br /> the best method of disposal of the contaminated soil . <br /> Geological Audit recommends that the drums containing the <br /> decontamination water be hauled by Falcon Energy Associates to a <br /> licensed facility for disposal, and that written certification of <br /> proper disposal be transmitted to San Joaquin County EHD. <br /> Sincerely, <br /> GEIO�LOGICAL AUDIT SERVICES, INC. <br /> Victor B. Cherven, Ph. D. <br /> Project Geologist <br /> �a <br /> e - <br /> S , <br />