ARCHIVED REPORTS XR0007812 - Laserfiche WebLink

Home Browse Search

r s31 January 2002 AGE-NC Project No 95-0128 Page 3 of 8 ' 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(sui ged)i epeatedly for approximately 20 minutes to settle the filter 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 diagi am is Included as Appendix A 23 WELL DEVELOPMENT On 13 July 2001 wells EW-1 and EW--2 were developed utilizing a stainless steel hand bailer,4-inch diameter PVC hand bailer Approximately 60 gallons of ground water were pui ged from wells until the ground water produced was visually sediment free Purged gi ound water was collected from the wells to a pi operly 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 Thi ee soil sample fi om the site was submitted for geotechnical analysis The samples were transported to Copper Testing Laboratory (CTL) of Mountain View, California and were analyzed foi poi osity and permeability in accordance with ASTM Method D5084 r ' 3.0. GROUND WATER EXTRACTION TEST On 18 October 2001, a twelve-hour aquifer pump test was performed at the site to assess the genei al aquifer characteristics and to assess aquifer response to ground water extraction at a constant pumping s ate utilizing well EW-1 for groundwater extraction and wells EW-2, MW-3, MW-4, MW-5, and MW-6 and vapor well VW-1 to VW-4 as observation wells Two extracted ground water samples were collected and purged ground water was containerized in an on-site 6,500-gallon poly tank (Baker tank) 3 1 AQUIFER TEST, 18 OCTOBER 2001 The ground watei extraction test consisted of extracting ground watei from well EW-1 at a rate of 5 gallons per minute (GPM) Ground water was exti acted fi om the ripper water table, the depth to ' ground water was within the screened interval of the extraction well 9dvanced CeuEuvironmental inc ,