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APPENDIX A <br /> DRILLING AND SOIL SAMPLING PROCEDURES <br /> All drilling activities will be performed by West Hazmat <br /> Drilling Corporation of Rancho Cordova,' California using a <br /> truck-mounted CME 55 drilling rig. Soil borings will be <br /> drilled using 5-inch-diameter, continuous flight hollow-stem <br /> augers . To avoid cross-contamination, the augers will be <br /> steam cleaned prior to drilling each boring. <br /> I <br /> Soil samples will be obtained for soil description, field <br /> hydrocarbon vapor testing, and laboratory analysis. Samples <br /> will be collected at 5-foot intervals from the borings <br /> drilled for this preliminary soil assessment. <br /> Soil samples collected at 5=foot intervals will be retrieved <br /> ahead of the lead auger using an 18-inch-long by <br /> 2-inch-diameter split spoon sampler lined with <br /> 1 .5-inch-diameter stainless steel sample tube inserts . The <br /> sampler and sample tubes will be washed with a Liquinox <br /> solution and rinsed before each sampling event. The sampler <br /> will be driven by a 30-inch free fall. of a 140-pound hammer. <br /> Blow counts will be recorded for three successive 6-inch <br /> intervals. <br /> Upon retrieval from the sampler, the sample sleeve will be <br /> removed and securely sealed with teflon tape and polyurethane <br /> caps . The sample will• be labeled with sample identification, <br /> sample depth, engineer's initials, and date of collection. <br /> The soil sample will be kept on ice prior to and' during <br /> transport to a California-certified laboratory. <br /> The remaining soil recovered will be described in accordance <br /> with the Unified Soil Classification System. For each soil <br /> type, field estimates of density/consistency, moisture, <br /> color, grading, and soil type will be recorded on the boring <br /> logs. <br />