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15 May 2001 <br /> AGE-NC Project No 97-0333 <br /> Page 2 of 7 <br /> ' Boring logs documenting the as-built well installations are included as Appendix A <br /> ' 2 12 Equipment Decontamination <br /> The hollow stem augers were steam-cleaned prior to each bore hole advancement Following drilling, <br /> ' rinseate generated from decontaminating the equipment was placed in properly labeled DOT- <br /> approved model 17H 55-gallon drums and placed in the southeast portion of the site in an area <br /> lacking public access <br /> 22 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 (0 030-inch slot), boring MW-6 was single-completed as a ground water observation well <br /> utilizing schedule 40, 2-inch diameter blank PVC well casing and perforated, 2-inch diameter PVC <br /> ' well casing (0 020-inch slot) <br /> Both wells were 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 No 2/12 Monterey <br /> sand (filter pack) was slowly poured down the annulus between the well casing and the inner wall <br /> of the hollow stern auger, filter pack material placed in EW-1 consisted of a 50150 blend of trine <br /> grained aquarium gravel and 2/12 Monterey Sand The filter pack was placed adjacent to the <br /> screened casing from the bottom of the boring to a point approximately two feet above the top of the <br /> screen, following filter pack placement, a surge block was inserted into the well casing and was <br /> ' alternately raised and lowered(surged)repeatedly for approximately 20 minutes A nominal two feet <br /> of bentonite pellets (transition seal) were placed above the filter pack and allowed to hydrate with <br /> clean tap water The remaining annular space was backfilled with portland cement As-built well- <br /> construction diagrams are included as Figures 3 and 4 <br /> I ? 3 WELL DEVELOPMENT <br /> On 02 April 2001, wells EW-1 and MW-6 were developed utilizing a stainless steel hand bailer, a <br /> ' two-stage submersible pump and a 4-inch diameter Grundfos submersible pump Approximately 125 <br /> gallons of ground water were purged from well EW-1 and approximately 45 gallons were purged <br /> from MW-6 until the ground water produced was visually sediment free Purged ground water was <br /> ' discharged from wells EW-1 and MW-6 to properly labeled DOT-appro'ed modcl 17H 55-gallon <br /> Adianced(.EoFmjronmcntal inI, <br />