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E T9 <br /> _r- <br /> CHAPTER 2 <br /> FIELD METHODS <br /> During the week of April 24, 1987, three groundwater monitoring <br /> wells were installed. Drilling and installation were done by P.C. <br /> a Exiloration, Inc. , (PC) using a truck-mounted drUling rig equipped <br /> with 4--inch-inside-diameter and 8�-inch-outs' st <br /> xde-diameter hollow-stem <br /> augers. PC has a C-57 contractors license. Locations of the three <br /> 5, <br /> monitoring wells are shown on Figure 2-1. <br /> reholes were advanced to a total depth Of approxisnateZy <br /> 27., feet, or about 20 feet below, .the groundwater surface. Soil <br /> v samples for lithologic classification and potential laboratory <br /> analyses were collected at 5-foot intervals, when possible, by using <br /> an 18-inch-long by 2-inch-diameter Modified California <br /> type sampler <br /> with 6-inch-long brass tube liners. The drive sampler was driven <br /> ahead of the auger into undisturbed soil. Each borehole ti oe was logged <br /> r. from the samples taken at 5-foot intervals, using the Unified Soil <br /> Classification System. Borehole s <br /> are logs <br /> presented in Appendix B. <br /> Soil samples were screened in the field for organic vapors with a <br /> photoionization detector (PID) , and those samples containing organic <br /> vapors were retained for potential laboratory analyses. The ends of <br /> i <br /> the -tubes were covered with foil ani a plastic cap taped to <br /> the <br /> tube. These samples were stored on ice from collection through <br /> delivery to the Brown and Caldwell <br /> (BC) California Department of <br /> a Health Services certified analytical laboratory in Emeryville, <br /> ( g California. Cuttings from each borehole were contained in 55- al <br /> t t:� <br /> drums and temporarily stored on the site pending results fhen <br /> I <br /> analytical tests. <br /> n F• <br /> 2 4 <br /> s <br />