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Elks Lodge Property 0 <br /> 317 South Center Street March 16, 2001 <br /> Stockton, California Page: 4 <br /> • <br /> ' Refer to Table 1 of this report for a tabular representation of the soil contaminate <br /> concentrations. Appendix C contains the laboratory analytical data, Chain of <br /> Custody Reports, and QA/QC documents. Table 1 provides a tabular summary of <br /> the soil analytical data. <br /> ' 4.2 Groundwater Analytical Results <br /> The groundwater analytical data for collected from Boring B-1 was collected at <br /> 26.5 feet below ground level. Gasoline and motor oil were present in the water <br /> sample at concentrations of 0.13 mg/L and 23 mg/L, respectively. No purgeable <br /> halocarbons were present. EPA method 8260B revealed the presence of toluene, <br /> ethyl-benzene and methyl tert-butyl ether (MTBE) at concentrations of 0.4 ug/L., <br /> 0.4 ug/L, and 1.1 ug/L, respectively. The only metals that were found as a result <br /> ' of the 6010B analysis were arsenic, barium, copper, molybdenum, and vanadium. <br /> Appendix C contains the laboratory analytical data, Chain of Custody Reports, and <br /> QA/QC documents. Table 2 provides a tabular summary of the groundwater <br /> analytical data. <br /> 5.0 Soil Conditions <br /> Data from the boring logs (Appendix B) were used to determine the lithology <br /> ' underlying this location of the site. The subsurface lithology at the Elks Lodge <br /> Property consists of clays, silts, and sands. <br /> The groundwater was encountered at approximately twenty-six (26) feet below ground <br /> level. <br /> 6.0 Geology <br /> The subject property is located on the western side of California's Central Valley. The <br /> Central Valley is approximately 400 miles long and averages 50 miles wide encompassing <br /> approximately 20,000 square miles. The valley is a large asymmetric trough that is <br /> bounded by granitic, metamorphic and marine sedimentary rocks of pre-tertiary age. This <br /> trough has been filled with as much as 30,000 feet of sediment in the San Joaquin Valley <br /> ' portion to the south, and as much as 60,000 feet of sediment in the Sacramento Valley <br /> portion to the north. The age of the sediments range from Jurassic to Holocene and <br /> include both marine and continental rocks and sedimentary deposits (Olmstead and Davis, <br /> 1961). <br /> • <br />