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I U <br /> SAMPLING METHODOLOGY <br /> Impact (stainless steel or brass tube) samples will be collected for both soil logging purposes <br /> and for laboratory analysis. The samples will be obtained by inserting three pre-cleaned sample <br /> tubes into a split-spoon sampler attached to a drop hammer tool. The sampler will be driven <br /> by repeated blows of the 140 lb. drop hammer to a depth of approximately 18 inches below the <br /> starting point. The sampler will be retrieved and the sample tubes carefully removed. The <br /> upper sample tube will be discarded, and the middle tube will be retained for photoionization <br /> detector testing and soil classification. The lowermost sample tube will be trimmed and sealed <br /> with Teflon® film sheets and plastic end caps. Each tube will also be taped to preclude the <br /> introduction of moisture or other contaminants to the sample. These lowermost tubes will be <br /> used for laboratory analyses. <br /> After sealing, the lowermost tube samples will be properly labeled, placed on ice in a cooler, <br /> and will be transported to the analytical laboratory under chain-of-custody protocols for analysis. <br /> Sampling tools will be washed in anAlconox solution and rinsed with distilled water before each <br /> new sample is collected. Clean gloves will be worn during sample handling to protect the <br /> samples and sample tubes from cross-contamination. The gloves will be renewed prior to <br /> F <br /> handling each successive sample. <br /> The photoionization detector will be calibrated at the beginning of each working day, and <br /> ri <br /> periodically throughout the working day as deemed necessary by the field sampling technician, <br /> in accordance with the manufacturer's specifications. Hexane calibration gas will be utilized in <br /> instrument calibration. <br /> Soil from the middle sample tubes will be divided and placed into two separate sealable plastic <br /> bags. The first bag will be placed in the sun for a few minutes to induce volatilization of <br /> Chydrocarbon compounds. The vacuum tip of the photoionization detector will then be inserted <br /> L into the plastic bag and an ambient temperature headspace (ATH) reading will be taken. Soil <br /> from the other plastic bag will be used for visual classification purposes, and will be retained <br /> by Sierra-Pacific until the report has been completed. . <br /> Sierra-Pacific Groundwater Consultants, Inc. B-1 <br />