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06 November 2002 <br /> AGE-NC Project No 98-0432 <br />' Page 3 of 8 <br />' 2 2 WELL COMPLETION <br /> Boring EW-1 was single-completed as a ground water extraction well utilizing schedule 40, 6-inch <br />' diameter blank polyvinylchloride (PVC) well casing and perforated, 6-inch diameter PVC well <br /> casing (0 020-inch slot) Boring MW-9 was single-completed as a ground water monitoring well <br /> utilizing schedule 40, 2-inch diameter blank polyvinylchloride (PVC) well casing and perforated, <br />' 2-Inch diameter PVC well casing (0 020-inch slot) <br /> The wells was Installed by placing the PVC well casing assembly through the hollow stem of the <br />' augers to the total depth of the boring The augers were Incrementally raised as filter pack material <br /> consisting of a#3 Monterey Sand was slowly poured down the annulus between the well casing and <br /> the Inner wall of the hollow stem auger The filter pack was placed adjacent to the screened casing <br />' from the bottom of the boring to a point approximately two feet above the top of the screen <br /> Following filter pack placement, a surge block was Inserted Into the well casing and was alternately <br />' raised and lowered(surged)repeatedly for approximately 20 minutes to settle the filter pack material <br /> A nominal three-foot seal of bentonite pellets was placed above the filter pack and allowed to <br /> hydrate with clean tap water The remaining annular space was backfilled with portland cement As- <br /> built well-construction diagrams are Included In Appendix A <br />' 3.0. GROUND WATER AQUIFER PUMPING TEST <br />' On 12 to 14 June 2002, a 48-hour ground water extraction pilot test was performed at the site to <br /> assess the general groundwater aquifer characteristics and to assess aquifer response to ground water <br /> extraction at a constant pumping rate utilizing wells EW-1 and MWA through MW-9 Well EW-1 <br /> I was screened from 16 to 36 feet below surface grade (bsg), the other wells were screened from <br /> approximately 15 to 30 feet bsg <br />' The extracted ground water was containerized In two on-site 4,000-gallon poly tanks <br /> I3 1 EXTRACTION PILOT TEST <br /> The static pumping test consisted of extracting ground water from well EW-1 utilizing a 4-inch <br />' diameter submersible Grundfos Redl-flo pump, the constant pumping rate for the test was set at <br /> 6 gpm,monitored by an In-line,direct measuring device(Blue-White model F-400 flow rotometer) <br /> Approximately 12,400 gallons of water were removed from EW-1 during the 48-hour constant rate <br /> drawdown test <br /> Advanced GeoEnviron mental,Inc <br /> y <br />