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7hN3dwve118JbA10 <br /> • <br /> 2.0 STUDY AREA INVESTIGATION <br /> Field work was performed by Treadwell & Rollo personnel at Areas 10, 11, 20, and 21 during <br /> the week of 17-21 April 2000. Additional sampling was performed at Area 10 by Treadwell & <br /> Rollo personnel on 6 June 2000. Field work was performed by AGE at Areas 15 and 16 on 2 <br /> May 2000, in general accordance with the Treadwell & Rollo Field Investigation Workplan. <br /> Section 2.1 presents the general field investigations methods and Section 2.2 summarizes the <br /> specific work that was performed at each area. <br /> 2.1 Investigation Methodology <br /> A description of the techniques used during the field investigation for this project are described <br /> in the following sections. <br /> 2.1.1 Surveying <br /> • Siegfried Engineering surveyed and marked the locations of all of the proposed boring locations, <br /> and surveyed the locations and top of casing elevations for 8 groundwater monitoring wells at <br /> Area 10 and Area 20. <br /> 2.1.2 Drilling Methods <br /> The direct push method used during this investigation involved pushing soil or groundwater <br /> samplers into the ground to collect samples or to make a boring for installing temporary well <br /> casing. The direct push method produces no cuttings at the surface during the sampling process, <br /> and allows for continuos cores to be collected. <br /> The direct push method used by Spectrum Drilling involved using a hydraulically-powered probe <br /> mounted on a large truck auger rig that relies on the truck's weight combined with a percussion <br /> hammer to advance the boring. Steel casing is advanced into the soil behind the core sampler to <br /> prevent the hole from collapsing after sampler removal. Samples were collected in 3/4 inch <br /> • diameter, 36 inch long butyrate liners, and 6 to 12 inch sections were cut from the liners and <br /> 17 <br /> 25970309.DGD 24 August 2000 <br />