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1 ' 30 March 2005 • AGE-NC Protect No 95-0130 Page 2of13 ' • 03 December 2004 - Quarterly ground water monitoring event performed at wells MW-1 through MW-3, MW-5 through MW-8, VW-1C, VW-2A and VW-3A • 22 December 2004 - Monthly monitoring event performed on SVE remediation system ' • 29 December 2004 - Monthly monitoring event performed on P&T remediation system 2.0. GROUND WATER MONITORING PROCEDURES A quarterly ground water monitoring event was performed at the site on 03 December 2004 Ground water monitoring procedures for the site were outlined in the Work Plan Addendum - June 2001, ' dated 11 June 2001 and approved by the San Joaquin County Environmental Health Department (SJCEHD) by letter dated 07 July 2001 I The adjacent Knowles-Rock(102 South Wilson Way)quarterly ground water monitoring event was performed on 17-18 November 2004,the Knowles-Roek ground water monitoring event analytical 10 results are tabulated and included In Appendix A 2 1 WELL MONITORING AND PURGING On 03 December 2004, depth to ground water was measured in each well from the top of the well casing to the nearest 0 01-foot utilizing a Solinst water level meter Ground water was not encountered in wells V W-1 A, VW-113, V W-2B and VW-313 and were reported as 'dry', ground water could not be recovered from wells MW-6A and MW-7A and the monitoring locations were subsequently reported as`dry',a tubing obstruction was encountered from well MW-7E and ground rwater samples could not be collected,well MW-4 was inaccessible due to a parked car and could not be sampled The ground water elevation at wells MW-1,MW-2,MW-3 and MW-5 through MW-8, VW-1C, VW-2A and VW-3A were calculated by subtracting the measured depth to ground water from the surveyed casing elevation As-built monitoring well construction details are summarized In Table 1 Ground water elevations were plotted and contoured on scaled site maps depicting First Zone and Second Zone ground water elevations (Figures 3 and 4, respectively) After water levels were measured,approximately t/3 to 161/2 gallons of ground water(a minimum of three casing-water volumes perwell)were purged from wells MW-1,MW-2,MW-3,MW-5 through MW-8, VW-IC, V W-2A and VW-3A by lowering and raising a 3/g-inch diameter, length-discrete polyethylene hose equipped with a ball-valve water tip through the specific water-charged screened section A Watera Hydro-Lift II pump equipped with a mechanical arm was utilized to surge the . polyethylene hose Temperature, pH and conductivity were measured for stabilization at regular purge-volume Intervals from each well using the Oakton water analyzer Field data and logs are in IAdvanced GeoEnvironmental,Inc