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' 14 February 2003 • AGE-NC Project No 98-0432 ' Page 3 of 6 ' 2 1 4 Well Development On 09 December 2002,monitoring wells MW-7 and MW-8 were developed utilizing a stainless steel ' hand bailer and a Wattera purging system with a tube bailer Ground water was purged from each monitoring well until ground water was visually sediment free, 6 5 gallons of water were removed from wells MW-7 and MW-8 Purged ground water was contamenzed in properly labeled DOT- approved model 17H 55-gallon drums and was stored on-site Field sheets and data are included in Appendix B 2 2 GROUND WATER MONITORING PROCEDURES ' The quarterly ground water monitoring event was performed on 09 December 2002, ground water monitoring was performed on monitoring wells MW-1 through MW-8 2 2 1 Well Monitoring and Evacuation lie The depth to ground water was measured at each of the monitoring wells from the top of the well casing to the nearest 0 01-foot utilizing a Solmst water level meter Ground water elevation in each well at the site was calculated by subtracting the measured depth to ground water from the surveyed ' well casing elevation (Table 1) ' After the depth-to-ground water measurements were collected, the wells were purged using a disposable, dedicated plastic-bailer Approximately, 6 to 6 5 gallons of water were removed from monitoring wells MW-1 through MW-6, a minimum of three casing-water volumes per well Monitoring wells MW-7 and MW-8 were purged during well development (Section 2 14), approximately 6 5 gallons of water were removed from MW-7 and MW-8 Temperature, pH and conductivity of the purged water were measured at regular purge-volume intervals with an Oakton ' water analyzer Monitoring well field logs are included in Appendix B Purge water generated from the site monitoring wells was contained on-site in appropriately labeled 55-gallon drums ' 2 2 2 Collection and Analysis of Ground Water Samples ' After allowing the-wells to achieve a minimum 80°�recovery of the pre-purge water volume,ground - water samples were collected from the monitoring wells using disposable polyethylene bailers,these bailers were disposed of after one use and require no decontaminating, thereby minimizing cross ' contammation due to sampling devices Each water sample was transferred into three 40-m1 EPA-approved VOA vials containing 0 5 ml 18%HCl as a sample preservative and into one 1-liter amber bottle without preservative After collection,the samples were labeled and placed in a chilled Advanced GeoEnvzronmental,Inc