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' 12 August 2002 <br /> AGE-NC Project No 95-0103 <br /> ' Page 2 of 11 <br /> 2 1 2 Equipment Decontamination <br /> 1 <br /> The hollow stem augers were steam-cleaned prior to advancement of each soil pilot boring <br /> ' Following drilling activities,nnseate generated from decontaminating the equipment was placed in <br /> properly labeled DOT-approved model 17H 55-gallon drums and placed in the southeast portion of <br /> the site <br /> 2 13 Well Completion <br /> Soil borings EW 1,EW-2 and EW-3 were single-completed as ground water extraction wells utilizing <br /> a schedule 40, 6-inch diameter blank polyvinylchloride(PVC)well casing and a perforated, 6-inch <br /> tdiameter PVC well casing(0 020-inch slot) The wells was installed by placing the PVC well casing <br /> assembly through the hollow stem of the augers to the total depth of the boring The augers were <br /> ' incrementally raised as filter pack material consisting of a 50150 blend of fine grained aquarium <br /> gravel and#3 Monterey Sand was slowly poured down the annulus between the well casing and the <br /> inner wall of the hollow stem auger The filter pack was placed adjacent to the screened casing from <br /> the bottom of the boring to a point approximately two feet above the top of the screen Following <br /> lie <br /> filter pack placement, a surge block was inserted into the well casing and was alternately raised and <br /> lowered (surged) repeatedly for approximately 20 minutes to settle the filter pack material A <br /> ' nominal three-foot seal of bentonite pellets was placed above the filter pack and allowed to hydrate <br /> with clean tap water The remaining annular space was backfilled with portland cement An as-built <br /> well-construction diagram is included as Appendix A <br /> 2 14 Well Development <br />' On 16 January 2002, the extraction wells were developed utilizing a stainless steel hand bailer, a <br /> 4-inch diameter PVC hand bailer, and a submersible pump Approximately 45 gallons of ground <br />' water were purged from the wells before the ground water produced was almost sediment free <br /> Purged ground water was discharged from the wells to a properly labeled DOT-approved model 17H <br /> 55-gallon drum and was stored at the site <br /> 1 <br /> 2 2 INSTALLATION OF GROUND WATER EXTRACTION SYSTEM <br />' The ground water extractions stem consisting of the ground water treatment unit and associated <br /> � Y g <br />' piping was installed between January and March 2002 <br /> Advanced GeoEnvironmental,Inc <br /> 1 a <br />