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' 06 August 2004 <br /> AGE-NC Project No 95-0128 <br />' Page 4 of 11 <br />' 23 VAPOR AND EXTRACTION WELL INSTALLATION,DEVELOPMENT AND SURVEY <br /> Four soil borings were advanced on 15 and 16 March 2004 for collection of soil samples and <br /> installation of one ground water extraction and three soil vapor wells (EW-2, VW-2, VW-3 and <br /> VW-4) The extraction well was developed on 29 March 2004 Wells MW-17, MW-18 and EW-2 <br /> were then surveyed on 30 March 2004 <br /> 2 3 1 Drilling and Sampling <br />' On 15 and 16 March 2004, four soil borings (EW2, VW2 through VW4)were advanced at the site <br /> A CME-75HT truck mounted or limited access dnll rig was utilizing to advance 8 25-inch diameter <br />' hollow-stem augers for the vapor wells and 12-inch augers for the extraction well,to the total depth <br /> of each boring The drill rigs and three-man crew were supplied by Cascade Drilling Incorporated <br /> of Rancho Cordova, California Auger returns generated by drilling were containerized in properly <br />' labeled Department of Transportation(DOT)-approved model 17H 55-gallon drums andwere stored <br /> on-site The waste soil was then transported off-site for disposal on 01 April 2004 <br /> Soil samples were collected from vapor well pilot borings VW3 and VW4, ahead of the drill bit <br /> using a California modified split-spoon sampler loaded with three pre-cleaned 2-inch by 6-inch brass <br />' sleeves The samples were collected from the pilot borings at 5-foot intervals, beginning at 5 feet <br /> below surface grade(bsg),using a 140-pound hammer to advance the sampler The number ofblows <br /> required to advance the sampler over each 6-inch increment of the 18-inch sampling interval was <br />' recorded on the boring logs After sample recovery,both ends of the second or other selected sleeve <br /> were covered with Teflon sheets, capped and sealed with tape The sample sleeves were labeled, <br /> stored on ice and transported under chain of custody to CTEL, a State of California DHS-certified <br />' analytical laboratory - <br />' 2 3 2 Logging <br /> Soil was extruded from a second brass sleeve and screened for the presence of organic vapor using <br /> an organic vapor meter (OVM) equipped with a photo-ionization detector (PID Thermo <br /> Environmental 580, 10 0 eV, calibrated to isobutylene), the OVM readings were recorded on the <br /> boring log The soil was then visually described by and AGE geologist in accordance with the <br />' Unified Soil Classification System (see Appendix C) <br />' Advanced GeoEnvironmental Inc <br />