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development and purging. Samples will be placed in <br /> clean containers for transport to a state-certified <br /> laboratory for analysis. <br /> All purging and ground water sampling equipment will <br /> be cleaned prior to use to minimize <br /> cross-contamination between wells. All equipment in <br /> contact with ground water will be triple-rinsed <br /> prior to each sampling event in successive baths <br /> consisting of tripolyphosphate solution, tap water, <br /> € and deionized water. Ground water removed from the <br /> monitoring wells will be placed into barrels prior <br /> to disposal or recycling at an appropriate waste <br /> disposal facility. <br /> Ground water samples will be collected by lowering a <br /> 2-inch-diameter, bottom,-fill, Teflon bailer just <br /> below the water level in the well. The samples will <br /> be carefully transferred from the check-valve- <br /> equipped bailer to zero--headspace l-liter and <br /> 90-milliliter glass containers fitted with Teflon- <br /> sealed caps. All samples will be inverted to ensure <br /> that entrapped air is not present. Samples will be <br /> labeled with sample number, well number, sample <br /> k date, and sampler's initials. Samples will remain <br /> on ice prior to laboratory analysis. <br /> -: All wells will be surveyed as to location and <br /> elevation in reference to an established benchmark <br /> or a common datum to within 0.01 foot. Water level <br /> elevations from each well will be measured, as well <br /> as the thickness of free floatin <br /> present, using an electronic sounderoduct, if <br /> it Task E: Analysis of Slil and Gr n nd Watp <br /> r mp lays <br /> Soil samples collected during drilling will be <br /> rs composited by a state-certified laboratory for the <br /> analyses required by the disposal facility (Forward, <br /> Inc.) to determine the. appropriate soil profile (s) . <br /> The composited soil samples will be initially <br /> i ' analyzed for TPH as diesel and TPH as <br /> gasoline <br /> BTEX distinction utilizing EPA Methods 3550/8015, <br /> 5030/8015, and 5030/8020, ,respectively. These - <br /> ' analyses. will be performed based on a five day <br /> turn-around time. Soil samples found to contain 100 <br /> Ppm or. greater TPH (diesel or gasoline) will be <br /> 5 <br /> r� . <br />