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i <br /> SITE CLOSURE <br /> The following site conditions support site.closure: <br /> 1 - <br /> The source of the contamination, the oil supply line and the overspill from filling of the <br /> former UGT, were removed. <br /> k <br /> 2) The extent of the soil contamination, the stockpiled soil from above the remove UGT and <br /> the soil excavated from the area of P7, has been fully assessed. <br /> 3) The contaminants are heavy end hydrocarbons, diesel and oil. These contaminants are <br /> relatively insoluble, immobile,.and tend to adsorb to soil. The fuel component of most <br /> environmental concern, Benzene, was not detected.' The limited levels of Toluene, Ethyl <br /> Benzene, and Xylene detected in the soil are not of environmental concern. <br /> 4) The total volume of contamination in.the soil is limited. An estimated 2 gallon of diesel <br /> and one gallon of oil were present in the soil. � <br /> 5) The types of contam-ination, diesel and oil; and level of contamination, are readily <br /> amenable to natural biodegradation <br /> 6) There is approximately 40 feet of separation between the deepest backfilled soil, at an <br /> -approximate maximum depth of 10 feet and the ground water and a depth of 50 feet. <br /> If you have any questions please feel free to contact our office. <br /> Sincerely, <br /> IS) <br /> David Lespei ce �� N0. 1743, <br /> Signal Geoscience Q CERTIFIm <br /> ENGINEERING <br /> IEOLOGPT <br /> Attachment <br /> Table EXP. <br /> Figure 1, Site Location ��0� <br /> Figure 2, Soil Sample Location <br /> a <br /> 1990 PICCOLI ROAD,STOCKTON CLOSURE <br /> PAGE '� <br />