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09 May 2002 AGE-NC Project No 96-0232 Page 8 of 18 San Joaquin County service area No 31 municipal water wells (CSA-1 and CSA-2), well MW-8A was resampled on 08 April 2002 to confirm detection of MTBE Quarterly ground water monitoring procedures for the site were outlined in the AGE-prepared Work Plan Addendum, dated 28 January 1998, and approved by the SJCEHD by letter dated 24 February 1998 As-built monitoring well construction details are summarized in Table 9 A coordinated effort was made with Three B's Truck Plaza (14749 Thornton Road, Lodi CA) to conduct ground water monitoring activities concurrently,the Three B's Truck Plaza tabulated ground water elevation results are in Appendix G 41 WELL MONITORING AND PURGE PROCEDURES On 26 March 2002, the depth to ground water was measured at each monitoring well from the top of each well casing to the nearest 0 01-foot utilizing a Solinst water level meter The ground water elevation in each monitoring well was calculated by subtracting the measured depth to ground water from the surveyed well casing elevations (Table 4) Ground water elevations were plotted for the Informal First Zone, Second Zone, Secondary Aquifer Zone and Primary Aquifer Zone hydrogeologic flow units as defined in AGE's Final Remediation Plan Groundwater elevation data was contoured on scaled site maps (Figures 3, 4, 5 and 6, respectively) On 27 and 28 March 2002, approximately 6 5 to 12 gallons of ground water (a minimum of three casing-water volumes per well)were evacuated(purged)from wells MW-1 through MW-7 utilizing either disposable polyethylene bailers, a two-stage submersible pump or a Watera-Hydro-Lift H pump equipped with a mechanical arm,approximately 75 gallons of ground water were purged from EW-3 utilizing a two-stage submersible pump Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using an Oakton water analyzer Field data and logs are in Appendix H Monitoring well purged ground water was transferred to the ground water remediation system holding tank for treatment and disposal The multi-level monitoring wells MW-8 through MW-13 were purged utilizing a Watera-Hydro-Lift 11 pump equipped with a mechanical arm by lowering and raising a 318-inch outer diameter, length- discrete polyethylene hose equipped with a ball-valve water tip through the top chambers into the specific water-charged screened section Approximately 0 25 to 5 gallons of ground water (a minimum of three casing-water volumes per well) were purged from the multi-level monitoring wells Temperature, pH and conductivity were measured for stabilization at regular purge-volume Intervals from each well using an Oakton water analyzer Field data and logs are in Appendix H Multi-level well purged ground water was transferred to the ground water remediation system holding tank for treatment and disposal Advanced GeoEnviron mental,Inc