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I <br /> 23 June 2003 <br /> . AGE-NC Project No 00-0769 <br />' Page 3 of 13 , <br /> r P <br /> Prior to each sampling run,the sampling equipment was washed in an Alconox solution and rinsed <br /> with water to avoid cross-contamination Auger returns generated by drilling were containerized and <br /> stored on-site in Department of Transportation(DOT)-approved 55-gallon drums pending laboratory <br /> r. <br /> analysis r <br /> i 4 I <br />' 312 Logging <br /> Soil was extruded from a second brass sleeve or from the unpreserved portions of the soil in the core <br />' sampler and screened for the presence of organic vapor using an organic vapor meter (OVM) <br /> equipped with a photo-ionization detector(PH) Thermo Environmental 5 80A, 10 0 eV, calibrated <br /> to isobutylene), the OVM readings were recorded on the boring log The soil was then visually <br />' described in accordance with the Unified Soil Classification System (see Appendix C) <br /> 4 <br />' 3 1 3 Well Completion/Boring Abandonment <br /> I <br /> At the completion of soil sampling,bonng B-2 was backfilled to surface grade with portland cement <br /> 10 Bonngs MW-4 through MW-9 were completed as multi-level ground water monitoring wells <br /> utilizing 1 7-inch outer diameter continuous multichannel tubing (CMT) equipped with stainless <br /> steel screen wrapping the depth-specific sampling ports (screen Intervals), the CMT was installed <br /> to a total depth of 170 feet bsg in borings MW-6 through MW-9 and to 200 feet bsg in borings <br /> MW-4 and MW-5 <br /> CMT screen intervals were based on soil data collected from pilot borings MW-4 and MW-5 and <br /> analytical results of grab ground water samples and interpreted soil profiles from previously-acquired <br /> Cone Penetrometer Testing (CPT) data Screen intervals were designed to assess the lateral and <br /> vertical extent of impacted ground water and to characterize ground water gradient and potential ' <br /> contaminant migration pathways at the site Screen intervals were installed at the following intervals <br /> r <br /> I i <br /> • 20 to 40 feet bsg, <br /> • 115 to 120 feet bsg, <br />' 0 141 to 146 feet bsg, and <br /> 165 to 170 feet bsg , <br /> 1 Monitoring wells MW-4 and MW-5 were constructed with a fifth screened interval from <br /> approximately 193 feet bsg to 198 feet bsg <br />' After installation of the well casings,a filter pack consisting of#3 monterey sand was Installed from <br /> • the bottom of each screened interval to approximately 2 feet above each screened interval A <br />' Advanced GeoEnvironmental,Inc <br /> ti <br />