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APPENDIX C <br /> DRILLING PROCEDURES AND SOIL SAMPLING PROTOCOL <br /> Soil bonngs/momtonng wells were drilled using 8-and 10-inch-diameter, continuous-flight, <br /> hollow-stem augers To avoid cross-contamination, the augers were steam cleaned prior to <br /> drilling each boring <br /> Soil samples were obtained for soil description, combustible gas testing, and laboratory <br /> analysis Samples were collected at a minimum interval of 5 feet from each soil borings <br /> Soil samples were retrieved ahead of the lead auger using an 18-inch-long split spoon <br /> sampler lined with 2-inch-diameter brass sample tube inserts The split spoon sampler was <br /> driven by a 30-inch free fall of a 140-pound hammer Blow counts were recorded for three <br /> successive 6-inch intervals The sampler and sample tubes were washed with an Alconox <br /> solution and rinsed before each sampling event <br /> Upon retrieval from the samplers, the sample tubes were securely sealed with aluminum <br /> sheeting and polyurethane caps The bottom sample tube was removed and capped The <br /> sample was labeled with sample identification, sample depth, geologist's initials, and date <br /> of collection, then placed in an iced cooler prior to and during transport to a <br /> California-certified laboratory <br /> The remaining soil recovered was described in accordance with the Unified Soil Classifica- <br /> tion System For each soil type, field estimates of density/consistency, moisture, color, <br /> grading, and soil type were recorded on the boring logs <br />