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' 11 August 2003 • AGE-NC Project No 96-0232 ' Page 7of15 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 ground water elevation results and analytical results are in Appendix F ' 3 1 WELL MONITORING AND PURGE PROCEDURES ' On 24 June 2003, 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 casing elevation(Table 4) Ground water elevation and vertical gradient data for wells MW-9,MW-11,MW-13,MW-16,MW-17,MW-18 and Three B's TruckPlaza wells MW-6, ' MW-9 and MW-10 are depicted in cross section C-C' (Figure 3), 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 (Figures 4, 5, 6 and 7, ' respectively) On 25, 26 and 27 June 2003, approximately 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 and MW-16 utilizing either disposable polyethylene bailers or submersible two-stage pumps, approximately 70 to 90 gallons of ground water were purged from wells EW-1 and 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 provided in Appendix G The purged ground water was transferred to the ground water remediation system holding tank for treatment and disposal ' Single-completion monitoring wel is MW-14,MW-15,MW-17,MW-18 and multi-level monitoring wells MW-8 through MW-13 were purged utilizing a Watera-Hydro-Lift II pump equipped with a mechanical arm by lowering and raising a 3/8-mch 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 211/2 to 293/4 gallons of ground water(a minimum of three casing- water volumes per well) were purged from the single-completion monitoring wells and approximately'/4 to 4%z gallons of groundwater 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 provided in Appendix G, purged ground water was transferred to the ground water remediation system holding tank for treatment and disposal IAdvanced GeoEnvlronmental,Inc