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23 September 1997 <br /> AGE-NC Project No 95-0184 <br />' Page 3 of 8 <br />' remediation wells Boring VW-5, drilled at an angle of 10° from vertical directed N 80° W, was <br /> advanced to a depth of 55 vertical feet bsg with a horizontal run of 9 7 feet and was completed as <br /> a vapor extraction remediation well During drilling, auger returns were monitored for the presence <br />' of organic vapor using an organic vapor analysis meter (OVM) equipped with a photo-ionization <br /> detector (PID Thermo Environmental 580A, 10 OeV, calibrated to isobutylene) <br /> 1 Soil samples were collected ahead of the drill bit using a split-tube sampler loaded with three pre- <br /> cleaned 2-inch by 6-inch brass sleeves Samples were collected at five-foot intervals using a 140- <br /> pound hammer to advance the sampler 18 inches The number of blows required to advance the <br /> sampler in 6-inch increments was recorded on the boring logs Due to the high angle of drilling for <br /> VW-1, blow counts were not representative and therefore were not recorded I ; <br /> Sampling equipment was washed in an Alconox solution and rinsed with water prior to each <br /> sampling run to avoid cross-contamination Augers were steam-cleaned between borings Auger <br /> returns were placed in 55-gallon DOT drums and were stored on-site , <br /> Each soil sample collected for analysis was preserved in the lead brass sleeve by covering both ends <br /> of the sleeve with Teflon sheets, capping and sealing with tape Samples were'labeled, stored on ice i <br /> and transported under chain-of-custody to McCampbell Analytical, Inc (MAI) in Pacheco Selected <br /> samples were analyzed for TPH-g and BTE&X in accordance with EPA methods 8015m and 8020, <br />' respectively Two samples were transported to A Keith Kaufman in Culver City and analyzed for <br /> physicochemical properties and bioenumeration <br /> 3 2 2 Logging <br />' Soil was extruded from the remaining brass sleeves and screened for the presence of organic vapor <br /> using the OVM equipped with a PID, and the readings were recorded on the boring logs Soil was <br />' described in accordance with the Unified Soil Classification System (see Boring Logs, Appendix <br /> C) <br />' 3 2 3 Well Completion <br />' Boring MW-7 was completed as a ground water monitoring well by installing 2-inch diameter PVC <br /> casing with 0 020-mch screen from 60 to 40 feet below surface grade (bsg) Blank PVC casing was <br /> then extended to the surface The filter pack (43 Lonestar sand)was installed from 60 feet to 38 feet <br />' and hydrated bentonite chips were used to make a 3-foot plug above the filter pack The boring was <br /> then grouted to the surface with portland cement Boring VW-1 was grouted from total depth to the <br /> surface using portland cement <br /> J1 <br /> Adtitanced GeoEnvironfnenlsi,Inc <br /> I <br />