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1 <br />' 11 January 2006 <br /> iAGE-NC Project No 95-0130 <br /> Page 2 of 14 <br />' weIls VW-I C, VW-2A and VW-3A to augment on-going P&T remediation system <br /> • 07 September 2005 - Monthly monitoring event performed on P&T and SVE remediation <br /> system <br />' • 22 September 2005 - Quarterly ground water monitoring event performed at wells MW-1 <br /> through MW-3, MW-5 through MW-8, VW-1C, VW-2A and VW-3A <br /> 1 <br /> 2.0. GROUND WATER MONITORING PROCEDURES <br />' Auarterl round water monitoring q y g g event was performed at the site on 22 September 2005 Ground <br />' water monitoring procedures for the site were outlined in the Work Plan Addendum - June 2001, <br /> dated 11 June 2001 and approved by the San Joaquin County Environmental Health Department <br /> (SJCEHD) by letter dated 07 July 2001 <br /> 2 1 WELL MONITORING AND PURGING <br />' • On 22 September 2005, depth to ground water was measured in each well from the top of the well <br /> casing to the nearest 0 01-foot utilizing a Solinst water level meter Ground water could not be <br />' recovered from wells MW-6A and MW-7A and the monitoring location was subsequently reported <br /> as `dry', a tubing obstruction was encountered from well MW-7E and ground water samples could <br /> not be collected, well MW-4 was inaccessible due to a parked car and could not be sampled The <br /> ground water elevation at wells MW-1, MW-2, MW-3 and MW-5 through MW-8 were calculated <br /> by subtracting the measured depth to ground water from the surveyed casing elevation As-built <br /> monitoring well construction details are summarized in Table 1 Ground water elevations were <br /> plotted and contoured on scaled site maps depicting First Zone and Second Zone ground water <br /> elevations (Figures 3 and 4, respectively) <br /> After water levels were measured, approximately 51/2 to 18 gallons of ground water(a minimum of <br /> three casing-water volumes per well) were purged from wells MW-1, MW-2, MW-3, MW-5 and <br /> MW-8 by lowering and raising a dedicated 3/s-inch diameter, length-discrete polyethylene hose <br /> equipped with a ball-valve water tip through the specific water-charged screened section <br /> Approximately 1/2 to 3 1/4gallons of ground water (a minimum of three casing-water volumes per <br /> well) were purged from wells MW-6 and MW-7 by lowering and raising a disposable 3/8-inch <br /> diameter,length-discrete polyethylene hose equipped with a ball-valve water tip through the specific <br /> water-charged screened section A Waters Hydro-Lift I1 pump equipped with a mechanical arm was <br /> utilized to surge the polyethylene hose Temperature, pH and conductivity were measured for <br /> stabilization at regular purge-volume intervals from each well using the Oakton water analyzer Field <br /> data and logs are in Appendix A The purged ground water was transferred to the interim ground <br /> Advanced GeoEnvironmentai,Inc <br />