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f�r 26 April 2004 AGE-NC Project No 97-0333 r ' Page 6 of 12 M1 h n 2002, prepared by AGE and approved by,San Joaquin County Environmental Health Department ' (SJCEHD) by, letter dated' 12 April 2002 As-built monitoring well construction details are summarized in Table 6 1 1 411 WELL MONITORING AND PURGE PROCEDURES I ' On 17 November 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 1 water elevation in each monitoring well was calculated by subtracting the measured depth to ground ' water from the surveyed casing elevation (Table 2) Ground water elevation and vertical gradient data for wells MW-11, MW-12 and MW-13 are depicted in cross section F-F' (Figure 3), ground ' water elevations were plotted in plan view for the informal First Zone,Second Zone,Third Zone and Primary Aquifer Zone hydrogeologic flow units as defined in AGE's Cone Penetrometer Testing Site Investigation -Fourth Quarter 2000, dated 07 February 2001 (Figures 4 through 7) On 18 and 19 November 2003, approximately 2'/a to 4 gallons of ground water(a minimum of three casing-water volumes per well)were evacuated(purged)from wells MW-1 through MW-5 utilizing disposable polyethylene bailers 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 E The purged ground water was transferred to the ground water ' f remediation system holding tank for treatment and disposal ' The single-completed well MW-6 and the multi-level monitoring wells MW-7 through MW-'13 were ' purged utilizing a Watera Hydro-Lift II pump equipped with a mechanical arm by lowering and raising a 3/s-inch outer diameter,length-discrete polyethylene hose equipped with aball-valve water ' tip through the top chambers into the specific water-charged screened section Approximately 1 to 10 gallons of ground water(a minimum of three casing-water volumes per well) was purged from single-completed well MW-6,approximately 1 to 5 gallons were purged from multi-level monitoring ' wells MW-7 through MW-13 Temperature,,pH land 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'F Multi-level well purged ground water was transferred to the ground f water remediation system,holding tank for treatment and disposal 42 I, FLOATING PETROLEUM PRODUCT j I On 08 October 2003,approximately 0 02- foot of a dark orange-brown, floating petroleum product f, was,encountered in well MW-2 and approximately 0125-foot encountered in well MW-6(Appendix H), tlierea&r, aiclear,disposable polyethylene bailer was utilized at the well to remove the'floating F Advanced GeoEnvcronmental„Inc