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MM <br /> j <br /> APPENDIX A <br /> DRILLING AND SOIL SAIMLING 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 4-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 /> 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 andsample tubes will be washed with an Alconox <br /> solution and rinsed before each ,samnling event. Tile sampler <br /> will be driven by a 30-inch free fall of a 140-pound hammer. <br /> ed for three successive 6-ii-icth <br /> Blow counts will be record <br /> intervals. <br /> :J Upon retrieval from the sampler, the sample sleeve will be <br /> removed and securely sealed with aluminum sheeting jlnd <br /> mi <br /> polyurethane caps. The samp;Le will be labeled r. .h;P ample <br /> f identification, sample depth, engineer's initials, :.a,nd date <br /> of collection. The soil sample will be kep,-. on ice prior to r�- <br /> and during 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 sail <br /> type, field estimates of density/consistency, moisture, <br /> color, grading, and soil type Will be recorded on the boring <br /> logs. <br />