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I 07 March 2003 AGE-NC Project No 95-0141 Page 3 of 10 IAll nnseate generated during drilling activities was containerized in properly labeled DOT-approved 55-gallon drums, and was stored on-site in an area lacking public access All soil borings were backfilled over their entire depth with a portland cement grout mix 2 2 MONITORING WELL INSTALLATION Between 14 October and 23 October 2002 soil borings were advanced i g at the e s t to install monitoring wells MW-813,MW-9A/B,MW-10A/B, MW-11 A/B and MW-12A/B) and one ground water monitoring/extraction well EX-1 2 2 1 Drilling The soil borings were advanced using a CME-75 high torque drill rig equipped with 8 25-inch diameter hollow-stein augers The drill rig and two-man crew were supplied by Cascade Drilling Soil samples were not collected during drilling activities Auger returns generated by drilling were stored lieon-site in properly labeled DOT(Department of Transportation)-approved 55-gallon drums pending laboratory analysis I2 2 2 Well Completions ' Pilot borings MW-8B, MW-9A/B, MW-10A/B, MW-11AB and MW-12AB were completed as ground water monitoring wells using two-inch diameter PVC casing with 0 020-inch slotted screen The screen was installed from approximately 15 to 35 feet bsg in MW-9A through MW-12A, and I from 60 to 65 feet bsg in wells MW8B through MW-12B,with blank casing extended to the surface Pilot boring EX-1 was completed as a ground water extraction well with 0 020-inch slotted screen installed from approximately 15 to 35 feet bsg and with blank casing extended to the surface The filter pack(No 3 Lonestar sand)was installed from the bottom of each boring to two feet above the screened intervals A nominal 2-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 C 2 2 3 Monitoring Well Development I On 18 October 2002, monitoring wells MW-10A, MW-10B, MW-11A and MW-11B were developed and on 23 October 2002,wells MW8B,MW-9A,MW-9B,MW-12A and MW-12B were developed All wells were developed utilizing a Watera-Hydro-Lift II pump Ground water was Ipurged from each monitoring well until the produced ground water was visually sediment free Advanced GeoEnvironmental,Inc I