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139 South Center Street, Stockton, California June 28, 1994 <br /> Chevron USA Products Company Page 4 <br /> 3.3 Soil Sampling <br /> During drilling, soil samples were collected at 5-foot intervals, beginning at approximately 5 feet below <br /> grade to the bottom of each boring. Samples were collected using a 2.5-inch O.D. split-spoon sampler, <br /> lined with three 2-inch-diameter by 6-inch-long brass sample tubes. The sampler was driven 18 inches <br /> ahead of the augers at each sample point. Soil samples were field screened for hydrocarbon vapors <br /> using a photo-ionization detector (PID). One sample from each 5-foot interval was sealed with aluminum <br /> foil, capped, taped, labeled, placed on ice in an insulated container, and delivered under chain-of- <br /> custody manifest to Superior Precision Analytical laboratory in San Francisco, California. The field <br /> geologist maintained a complete log of the materials encountered during drilling using the Unified Soil <br /> Classification System (Appendix B). <br /> Twenty-seven of the 38 samples collected from the soil borings were selected for analysis. One <br /> composite sample was collected and submitted for analysis for characterization of the soil cuttings. <br /> Each sample was analyzed for benzene, toluene, ethylbenzene and xylenes (BTEX), and TPH-G by <br /> Environmental Protection Agency (EPA) methods 5030/8020/modified 8015. In addition to the <br /> hydrocarbon analysis, soil from SB-5 was analyzed for California Assessment Metals (CAM-17) by EPA <br /> methods 6010 and 7000 series, and volatile organic compounds (VOCs) by EPA method 8240. <br /> W .LS GROUNDWATER <br /> 5039sUM.RPr TECHNOLOGY <br />