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J, Ff. KLEINFELDER &ASSOCIATES <br /> o AAsg4sment of soil a ground water chemiral contaminLion b <br /> Distribution of contaminants at the project property has been assessed. A <br /> soil chemistry summary and a ground water summary (Tables 2 and 3, <br /> Appendix A) have been prepared. These summaries should be used in <br /> conjunction with the geologic cross section and with the fence diagram to <br /> understand contaminant distribution at the project property as observed in <br /> mid--1987. A series of ground water and soil iso-chem maps have been <br /> prepared to illustrate contaminant distribution (refer to Appendix B). <br /> Gasoline, related compounds and methylene chloride have been detected <br /> within vadose zone sediments at concentrations ranging from 0 ppm to over <br /> 1,000 ppm. Areal distribution of these compounds within vadose zone <br /> sediments appears limited to on-site property (refer to the soil iso-chem <br /> maps, Appendix B). Off-site migration of gasoline within vadose zone t <br /> sediments is not indicated from samples collected and analyzed during <br /> mid-1987, <br /> { Ground water has been sampled from monitoring wells installed on the <br /> ! property. Gasoline, related . compounds and 1,2-Dichloroethane have been <br /> detected in these samples with concentrations ranging from 0-25,000 ppb. <br /> The leading edge for the plume within ground water appears to be located <br /> approximately south of location MW-2 (refer to the ground water iso-chem <br /> maps, Appendix B). Gasoline was measured at location MW-2 with a <br /> concentration of 700 ppb. Gasoline was detected in ground water at =. <br /> location MW-1 (near the former location of the underground gasoline <br /> .s storage tanks) with a concentration of 18,000 ppb. Distribution pattsrns <br /> observed during mid-1987 indicate that the bulk of the plume within ground <br /> water appears limited to on--site property. <br /> 53-87-Gk3 32 <br /> 1 ` Ids-��1fiLL_IlL <br />