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' 27 April 2003 • AGE-NC Project No 96-0235 ' Page 3 of 8 , ' or 3-foot bentonite chip plug was then installed above the filter pack and hydrated The wells were then grouted to near surface grade with portland cement, and water-tight, traffic-rated well boxes were installed over the wells As-built well diagrams are depicted on the boring logs in Appendix A 2 15 Monitoring Well Development 1 On 26 December 2002, monitoring wells MW-14AB and MW-15A/B were developed All wells were developed utilizing new, dedicated disposable plastic bailers Ground water was purged from ' each monitoring well until the produced ground water was visually sediment free Approximately 6 gallons of water were removed from wells MW-14A and MW-15A and approximately 15 to 19 gallons of water were removed from wells MW-14B and MW-15B Purged ground water was ' containerized in properly labeled DOT-approved model 17H 55-gallon drums and was stored on-site Field sheets and data are included in Appendix C 2 2Q UARTERLY GROUND WATER MONITORING lie Eighteen single-completed and two dual-completed ground water monitoring wells and two ground water extraction wells were purged and sampled on 26 December, 2002 Ten of the wells (MW-4, MW-5,MW-6A,MW-7,MW-8A,MW-10,MW-11A,MW-12A,MW-13A, 14A, 15A and EW-1) ' were shallow wells screened from approximately,10 to 35 feet below surface grade(bsg) Eight wells (MW-1, MW-2, MW-6B, MW-8B, MW-9, MW-11B, MW-12B, MW-13B, MW-14B and MW- 15B)) were deep wells screened from approximately 40 to 70 feet Two wells (MW-3 and EW-2) were intermediate wells screened between 30 and 50 feet 2 2 1 Well Monitoring and Evacuation ' A Solmst water level meter was used to measure the depth to ground water in the 24 wells relative to the tops of the well casings The ground water elevations and gradient were determined from these data(Table 1) 1 - I - ._ _._ _ _ _T 1 After recording water level measurements, each of the 24 wells was purged of standing water utilizing a down-hole pump or a dedicated disposable plastic bailer, between 5 and 60 gallons of ' water were removed from each of the wells (a minimum of 3 casing-water volumes per well) For the intermediate and deep wells,ground water was purged from near the top of the water column to remove water trapped within the non-screened interval of the well casings Ground water ' temperature,pH and conductivity were measured at regular purge-volume intervals using an Oakton i ' Advanced GeoEnvironmental,Inc 7