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h? p ' 30 June 2004 i AGE-NC Project No 97-0343 ' Page 3 of 6 ' 2 2 5 Monitoring Well Development On 05 August 2003,monitoring well MW-8 was developed utilizing a stainless steel hand bailer and ' a Waterra Inertia pump Approximately 6 gallons of water were removed from the well,however the well drew down while purging Ground water temperature,pH and conductivity were not measured due to the limited water removed from the well Field sheets and data are Included in Appendix C ' Purged water was stored on-site in properly labeled, 55-gallon DOT-approved drums ' 2 2 6 Well Head Survey On 26 September 2003, a California state-licensed survey engineer from Mid Coast Engineering ' (MCE) surveyed the location to the nearest i-centimeter and elevation at the top of the well casing of monitoring wells MW-1 through MW-8 to the nearest 0 01-foot relative to mean sea level(MSL) using coordinate datum NAD 83 (1983) and vertical datum NAVD 88 from global positioning ' system (GPS) observations and relative to City of Stockton Bench Mark # 191, surveyed at 32 40 feet above MSL The results of the monitoring well survey are contained in Table 1 The surveying report from MCE is presented In Appendix D 2 3 WELL MONITORING AND EVACUATION On 08 August 2003, a Solinst water level meter was used to measure the depth to ground water in monitoring wells MW-5 through MW-8 relative to the tops of the well casings Depth measurements were not possible in wells MW-1 through MW-4 because these wells had no measurable water (Appendix C) Consequently, these wells could not be purged or sampled Field sheets and data are Iincluded in Appendix C After recording water level measurements, dedicated disposable plastic bailers were used to purge wells MW-5 through MW-7 of standingwater,a Waterra inertiapump and dedicated hose bailer was used on well MW-8 Approximately 0 25, 0 5, 0 25 and 4 0 gallons of water were removed from wells MW-5, MW-6, MW-7 and MW-8, respectively, before the wells were purged dry Ground water temperature,pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer Purged water was stored on-site in labeled, 55-gallon DOT-approved drum Field sheets and data are included in Appendix C I • IAdvanced GeoEnvironmental,Inc