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45 E Harding Way, Stockton, California June 17, 1994 <br /> Chevron USA Products Company Page 5 <br /> 33 Soil Sampling <br /> During drilling, sod samples were collected at 5400t intervals, beginning at approximately 5 feet BGS to <br /> the bottom of each boring Samples were collected using a 2 5-inch O D split-spoon sampler, lined with <br /> three 2-inch-diameter by 6-inch-long brass sample tubes The sampler was driven 18 Inches ahead of <br /> the augers at each sample point Sod samples were field screened for hydrocarbon vapors using a <br /> photo-ionization detector (PID) One sample from each 5-foot Interval was sealed with aluminum foil, <br /> capped, taped, labeled, placed on ice in an insulated container, and delivered under chain-of-custody <br /> manifest to Superior Precision Analytical Laboratory In San Francisco, California The field geologist <br /> maintained a complete log of the materials encountered during drilling using the Unified Sod <br /> Classification System (Appendix B) <br /> Thirty of the 58 sod samples collected from the sod borings were selected for analysis Each sample <br /> was analyzed for benzene, toluene, ethylbenzene and xylenes (BTEX), and total petroleum <br /> hydrocarbons-as-gasoline (TPH-G) by Environmental Protection Agency (EPA) methods <br /> 5030/8020/modified 8015 <br /> { ` _ GROUNDWATER <br /> 4527AAa RPT ;� r�' TECHNOLOGY <br />