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06 October 2005 <br /> AGE-NC Project No 99-0657 <br /> Page 2 of 6 <br /> I bentonite pellet plug was then Installed above the filter pack and hydrated The wells were then <br /> grouted to near the surface with portland cement Water-tight, traffic-rated well boxes were then <br /> installed over the wells As-built well diagram are depicted on the boring logs in Appendix B <br /> I <br /> 2 13 Monitoring Well Development <br /> IOn 08 April 2005,monitoring wells MW-10 and MW-11 were developed utilizing a stainless steel <br /> hand bailer and an inertia pump Ground water was purged from each monitoring well until ground <br /> water was visually sediment free Approximately sixty gallons of water were removed from the <br /> wells Ground water temperature, pH and conductivity were measured at regular intervals during <br /> purging using an Oakton water analyzer Field sheets and data are included in Appendix C Purged <br /> water was stored on-site in properly labeled, 55-gallon DOT approved drums <br /> I2 14 Well Head Survey <br /> On 09 June 2005,a California state-licensed survey engineer from Morrow Surveying Inc surveyed <br /> Ithe elevation at the top of the well casing of monitoring wells MW-1 through MW-11 to the nearest <br /> 0 01-foot using California State Plane Zone 3 coordinates from GPS observations based on the <br /> spatial reference center datum,(coordinate datum NAD 83,datum ellipsoid GRS80,reference geoid <br /> NGS99 and vertical datum NAVD 88) The results of the monitoring well survey are contained in <br /> Table 1 The surveying report (Morrow Surveying) is presented in Appendix D <br /> I <br /> 2 2 QUARTERLY WELL MONITORING PROCEDURES <br /> The quarterly ground water monitoring event was performed on 25 April 2005, ground water <br /> monitoring was performed on monitoring wells MW-1 through MW-6 and MW-9, MW-10 and <br /> MW-11 <br /> 2 2 1 Well Monitoring and Evacuation <br /> On 25 April 2005, the depth to ground water in monitoring wells MW-1 through MW-11 was <br /> measured from the top of each well casing to the nearest 0 01-foot utilizing a Solinst water level <br /> meter Ground water elevation in each well was calculated by subtracting the measured depth to <br /> ground water from the surveyed casing elevation (Table 1) <br /> After recording water level measurements,wells MW-1 through MW-6 and MW-9 through MW-11 <br /> • <br /> Advanced GeoEnvironmental,Inc <br />