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06/2412002 15 42 2094671118 AGE STOCKTON PAGE 04 • 31 January 2002 AGE-NC Project No 95-0128 Page 3 of 8 bottom of the boring to a point approxmiately two feet above the top of the screen Following filter pack placement, a sui ge block was inserted into the well casing and was alternately raised and lowered(surged)repeatedly for appx oxmately 20 mmnutes to settle the filtex pack material. A nominal two-foot seal of bentonite pellets was placed above the filter pack and allowed to hydrate with clean tap water The remaining annular space was backfilled with portland cement An as-built well- construction diagram is included as Appendix A 2 3 WELL DEVELOPMENT On 13 July 2001,wells EW-1 and EW-2 wei a developed utilizing a stainless steel hand bailer,4-inch dxametei PVC hand bailei Approximately 60 gallons of ground water were purged from wells until the ground watei produced was visually sediment free Purged ground water was collected from the wells to a propei ly labeled DOT-apps oved model 17H 55-gallon drum and was stored at the site The field log for well development activities is included in Appendix B 2 4 SOIL SAMPLE ANALYSIS Three soil sample from the site was submitted foi geotechnical analysis The samples were tiansported to Copper Testing Laboratory(CTL) of Mountain View, California and were analyzed for porosity and permeability in accordance with ASTM Method D5084 3.0. GROUND WATER EXTRACTION TEST On 18 October 2001,a twelve-hour aquifer pump test was pex formed at the site to assess the general aquifer chaiactenstics and to assess aquifer response to ground water extraction at a constant pumping i ate utilizing well FW-l for gi ourxd water extraction and wells EW-2, MW-3, MW-4, MW-5,and MW-6 and vapor well VW-I to VW-4 as observation wells Two extracted ground water samples were collected and purged gi ound watei was containerized in an on-site 6,500--gallon poly tank(Baker tank) 3 1 AQUIFER TEST, 18 OCTOBER 2001 The ground water extraction test consisted of extracting ground water from well EW-1 at a rate of 5 gallons per mnute (GPM) Ground water was extracted from the upper water table, the depth to ground watei was within the screened inter val of the extraction well Advancdd GeoEnvlronmental Inc