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1 lie 28 October 2005 AGE-NC Project No 95-0130 ' Page 2 of 13 ' • 03 June 2005 - Monthly monitoring event performed on P&T remediation system • 06 June 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 ' • 22 June 2005 - Monthly monitoring event performed on SVE remediation system ' 2.0. GROUND WATER MONITORING PROCEDURES ' A quarterly groundwater monitoring event was performed at the site on 06 June 2005 Groundwater 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 The adjacent Knowles-Roek(102 South Wilson Way)quarterly ground water monitoring event was performed on 24-25 May 2005,the Knowles-Roek ground water monitoring results are tabulated and included in Appendix A 21 WELL MONITORING AND PURGING On 06 June 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 Well MW-4 was inaccessible due to a parked car and could not be sampled Groundwater was not encountered in wells MW-6A,VW-1 A, VW-1 B,VW-213 and VW-3B and were reported as `dry', groundwater could not be recovered from well MW-7A and the monitoring location was subsequently reported as `dry' 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 ISecond Zone ground water elevations (Figures 3 and 4, respectively) After water levels were measured, approximately 6 to 18 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 MW-8,V W-I C,VW-2A and VW-3A 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 I screened section, ground water samples could not be collected from well MW-7E due to a tubing obstruction Approximately 1/3 to 31/4 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 Advanced GeoEnvironmental,Inc