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' 20 March 2006 • AGE-NC Project No 95-0130 ' Page 3 of 13 • 07 November 2005 - Monthly monitoring event performed on P&T and SVE remediation Isystem • 06 December 2005 - 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, monthly monitoring event performed on SVE remediation system ' • 07 December 2005 - Monthly monitoring event performed on P&T remediation system ' 2.0. GROUND WATER MONITORING PROCEDURES A quarterly groundwater monitoring event was performed at the site on 06 December 2005 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 ' • 2 1 WELL MONITORING AND PURGING On 06 December 2005, 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 could not be recovered from wells MW-6A and MW-7A and the monitoring location was subsequently reported as `dry', a tubing obstruction was encountered from well MW-7E and ground water 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 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 6 to 17 gallons of ground water (a minimum of three casing-water volumes per well) were purged from wells MW-1, MW-2, MW-3, MW-5 and tMW-8 by lowering and raising a dedicated 3/8-inch diameter, length-discrete polyethylene hose equipped with a ball-valve water tip through the specific water-charged screened section Approximately 1/3 to 3`/4 gallons of ground water (a minimum of three casing-water volumes per well) were purged from wells MW-6 and MW-7 by lowering and raising a disposable 3/8-inch diameter,length-discrete polyethylene hose equipped with a ball-valve water tip through the specific I water-charged screened section A Watera Hydro-Lift 11 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 Advanced GcoEnvironmentai,Inc