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Harding Lawson Associates <br /> Appendix <br />{ SAMPLING METHODOLOGY <br /> All soil samples will be .retained in stainless steel tubes <br /> and the ends will` be sealed with aluminum foil, plastic <br /> caps, and teflon tape. Samples will be stored in a cooled <br /> ice chest until delivery to a state-certified laboratory for <br /> testing. The sampling equipment will be cleaned between <br /> samples in a solution of Alconox and water and then rinsed <br /> with deionized water. The augers will be steam-cleaned <br /> between borings. Soil cuttings from the borings will be <br /> placed on and covered with plastic sheeting. On the basis <br /> of soil sample results, HLA will recommend disposal options <br /> to our client. <br /> The monitoring wells will consist of 2-inch-diameter PVC <br /> casing with flush-mounted joints. The wells will be con- <br /> structed with 10 to 15 feet of screened section (0.02-inch <br /> perforations) and an appropriate length of solid PVC well C <br /> casing (2-inch-diameter Schedule 40 PVC) . The bottom of the <br /> PVC casing will be capped. The annular area between the <br /> casing and boring will be backfilled with No. 3 Monterey <br /> sand or equivalent, to at least 2 feet above the screened k <br /> section. A 12-inch layer of bentonite will be placed on top <br /> of the sand, and the remainder will be backfilled with a <br /> cement/bentonite seal. The wells will be housed in a <br /> locking, traffic-resistant box. Our field geologist will <br /> 032214MIL31 <br />