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24 October 2005 <br /> AGE-NC Project No. 98-0500 <br /> Page 5 of 11 <br /> 3.0. MONITORING WELL INSTALLATION,DEVELOPMENT AND SURVEY <br /> Eleven ground water monitoring wells(MW-3 8 through MW-48)were installed on between 21 June <br /> and 07 July 2005, developed on 11, 12 and 13 July 2005 and surveyed on 12 July 2005. <br /> 3.1. Drilling and Sampling <br /> The eleven pilot borings for monitoring wells MW-38 through MW-48 were advanced using a CME- <br /> 75HT or CME 95 drill rig, equipped with 8.25-inch diameter hollow-stem augers. The drill rig and <br /> three-man crew were supplied by Cascade Drilling Inc. Auger returns generated by drilling were <br /> containerized in plastic for treatment and while waste rinse water was stored in properly labeled <br /> DOT-approved model 17H 55-gallon drums stored on-site. <br /> Soil samples were collected in borings MW-39, MW-43 and MW-47 ahead of the drill bit using a <br /> California modified split-spoon sampler loaded with three pre-cleaned 2-inch by 6-inch brass <br /> sleeves. The samples were collected from the three monitoring well pilot borings at five-foot <br /> intervals, beginning at 5 feet below surface grade(bsg)using a 140-pound hammer to advance the <br /> sampler. The number of blows required to advance the sampler over each 6-inch increment of the <br /> 18-inch sampling interval were registered yet not recorded. Sampling equipment was washed in an <br /> Alconox solution and double rinsed with water prior to each sampling run to minimize cross- <br /> contamination. <br /> For each sample,both ends of the leading or other selected sleeve were covered with Teflon sheets, <br /> capped and sealed with tape. The samples were properly labeled, stored on ice and pending any <br /> necessary analytical work. <br /> 3.2. Logging <br /> Soil was extruded from the remaining brass sleeves in borings MW- 39, MW-43 and MW-47 and <br /> soil was then visually described on the boring log in accordance with the Unified Soil Classification <br /> System(see Appendix A).Cutting were screened for the presence of organic vapor using an organic <br /> vapor meter(OVM) equipped with a photo-ionization detector(PID: Thermo Environmental 580, <br /> 10.0 eV, calibrated to isobutylene). <br /> 3.3. Well Completions <br /> Pilot borings were completed as ground water monitoring wells using two-inch diameter PVC casing <br /> • with 0.020-inch slotted screen. <br /> Advanced GeoEnvironmental,Inc. <br />