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' 24 October 2005 . AGE-NC Project No 95-0167 ' Page 3 of 10 2 14 Monitoring Well Development On 24 September 2004, monitoring wells MW-7 and MW-8 were developed utilizing a stainless ' steel hand bailer and Waterra inertia pump Ground water was purged from each monitoring well until it was visually sediment-free,approximately 11 5 to 12 25 gallons of water were removed from the wells Purged ground water was containerized in properly labeled, DOT-approved 55-gallon ' drums and stored on-site Field sheets and data are included in Appendix C ' 2 2 QUARTERLY WELL MONITORING On 24 September 2004, quarterly ground water monitoring was performed on monitoring wells ' MW-1 through MW-8 2 2 1 Well Monitoring and Evacuation A Solinst water level meter was used to measure the depth to ground water to the nearest 0 01-inch ' • in monitoring wells MW-1 through MW-8 relative to the tops of the well casings The ground water elevations and gradient were determined from these data(Table 1) ' After recording water level measurements,dedicated disposable plastic bailers were used to evacuate (purge) monitoring wells MWA through MW-6 of standing water Wells MW-7 and MW-8 were ' purged using a Waterra inertia pump and dedicated tubing after development with a steel hand bailer Approximately 3 to 8 gallons of water (equivalent to three casing-water volumes per well) were removed from wells MW-1 through MW-4 and MW-6, monitoring well MW-5 drew down after ' 4 gallons of water were evacuated Approximately 12 gallons and 11 5 gallons of water were purged from wells MW-7 and MW-8, respectively Ground water temperature,pH, and conductivity were measured for stabilization at regular intervals during purging using an Oakton water analyzer Purged ' water was stored on-site in properly labeled,DOT-approved 55-gallon drums Field sheets and data are included in Appendix C 1 2 2 2 Collection and Analysis of Ground Water Samples Prior to-collection of ground water samples, the depth to ground water was re-measured-in each purged well to ensure that a minimum 80%of the initial well volume had recharged A water sample was collected from each purged well using the dedicated disposable plastic bailers or Waterra inertia ' pump Each water sample was transferred Into three 40-milliliter (ml) volatile organic analysis • (VOA) vials containing 0 5 ml 18% hydrochloric acid solution as a sample preservative After ' Advanced GeoEnvironmental,Inc