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Mr. Dean Willis Page Three <br /> October 18, 1990 <br /> Conclusigns <br /> There is a layer of sandy soil underlying the current excavation pit from <br /> approximately 20 feet to at least 35 feet below grade. This sand layer <br /> appears to be contaminated with hydrocarbons. Only one -of the samples <br /> collected showed non-detect levels for diesel and gasoline. -However, only <br /> one of the samples in the sand layer was highly contaminated. In addition <br /> to the one highly contaminated sand sample (S6B-18') there was one <br /> contaminated clay sample (S2A-2'). The extent of contamination around <br /> S2A-2' appears to be limited. The extent of contamination around S6B-18' is <br /> unknown. <br /> Sincerely, F <br /> ERM EnviroClean-West <br /> Jarn�`s E. Quinn, P.E. <br /> Flr�`esident <br /> JEQ/ty <br /> cc: .k Mr. Steve Schneider - San Joaquin County <br /> ; . IN <br />