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' Q9 May 2003 AGE-NC Project No 96-0232 Page 7 of 16 ' San Joaquin County service area No 31 municipal water wells (CSA-1 and CSA-2) on 27 March 2003 Quarterly groundwater monitoring procedures for the site were outlined in the AGE-prepared Work Plan Addendum, dated 28 January 1998, and approved by the San Joaquin County t Environmental Health Department(SJCEHD)by letter dated 24 February 1998 As-built momtonng well construction details are summarized in Table 9 f ' A coordinated effort was made with Three B's Truck Plaza (14749 Thornton Road, Lodi CA) to conduct groundwater monitoring activities concurrently,the Three B's Truck Plaza tabulated ground water elevation results are in Appendix F 1 3 1 WELL MONITORING AND PURGE PROCEDURES ' On 24 March 2003, the depth to ground water was measured at each monitoring well e 1 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 and MW-18 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 24 and 25 March 2003, approximately 6 to 12 gallons of ground water (a minimum of three I casing-water volumes per well) were evacuated (purged) from wells MW-1 through MW-6 and MW-16 utilizing either disposable polyethylene bailers or submersible two-stage pumps, approximately 75 to 95 gallons of ground water were purged from wells EW-1 and EW-3 utilizing I a two-stage submersible pump Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using an Oak-ton 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 wells MW-7, MW-14, MW-15, MW-17, MW-18 and multi-level Imonitoring wells MW-8 through MW-13 were purged utilizing a Watera-Hydro-Lift H pump equipped with a mechanical arm by lowering and raising a 3/s-inch outer diameter, length-discrete polyethylene hose equipped with a ball-valve water tip through the top chambers into the specific Iwater-charged screened section Approximately 7 to 30 gallons of ground water(a minimum of three casing-water volumes per well) were purged from the single-completion monitoring wells and approximately I/4 to 5 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, Advanced CeoEnvironmental,Inc