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30 May 2001 AGE-NC Project No 95-0128 Page 3 of 6 I The wells was installed by placing the PVC well casing assembly through the hollow stem of the augers to the total depth of the boring The augers were incrementally raised as filter pack material was slowly poured down the annulus between the well casing and the inner wall of the hollow stem auger The filter pack material placed in EW-1 consisted of a 50/50 blend of fine grained aquanum gravel and 21112 Monterey Sand The filter pack was placed adjacent to the screened casing from the bottom of the boring to a point approximately two feet above the top of the screen Following filter ' pack placement, a surge block was inserted into the well casing and was alternately raised and lowered (surged) repeatedly for approximately 20 minutes to settle the filter pack material A nominal three-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 :s included as Appendix A 23 WELL DEVELOPMENT On 26 March 2001, well EW-1 was developed utilizing a stainless steel hand bailer, 4-inch diameter PVC hand bailer, and a 4-inch diameter Grundfos submersible pump Approximately 40 gallons of ground water were purged from well EW-1 until the ground water produced was visually sediment free Purged ground water was discharged from well EW-1 to a properly labeled DOT-approved model 17H 55-gallon drum and was stored at the site The field log for well development activities is included in Appendix B I3.0 GROUND WATER AQUIFER PUMPING TEST On 27 March 2001, a twelve-hour aquifer pump test was perforined at the site to assess the general ' ground water aquifer characteristics and to assess aquifer response to ground water extraction at a constant pumping rate utilizing well EW-1 for ground water extraction and wells MW-1, MW-2, MW-4, MW-5 and MW-6 and vapor well VW-1 as observation wells Three ground water samples were collected from the extracted ground water and purged ground water was containerized in an on-site 6,500--gallon poly tank (Baker tank) 3 1 AQUIFER PUMPING TEST, 27 MARCH 2001 Ground water pump testing consisted of extracting ground water from well EW-t at a rate of 5 gal loris per minute (GPM) Ground ,x ater •='as extracted from the upper :=rater table, the depth to ground water Was within the screened interval of the extraction well The pump test consisted of extracting ground water Crom well EW-1 at a rate of GPM utilizing a IAdvanced CenEnvtronmentai Inc I