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' 15 June 2004 <br /> AGE-NC Project No 01-0877 <br />' Page 3 of 7 <br /> 2 4 SOIL BORING ABANDONMENT <br /> At the conclusion of soil boring activities, boring B5 was permanently sealed to prevent vertical <br />' migration of contaminants, under EHD oversight, the borehole was backfilled with cement slurry <br /> from the total depth to surface grade <br /> I2 5 MONITORING WELL COMPLETION <br />' Pilot borings MW 1 through MW4 were completed as ground water monitoring wells using two-inch <br /> diameter schedule 40 PVC casing with 0 020-inch slotted screen installed from approximately <br /> 20 feet to 40 feet bsg in all four borings, with blank casing extended to the surface The filter pack <br />' (No 3 Lonestar sand) was installed from approximately 22 feet to 40 feet bsg A nominal 2-foot <br /> bentonite chip plug was then Installed above the filter pack and hydrated The wells were then <br /> grouted to near the surface with portland cement, and water-tight, traffic-rated well boxes were <br />' installed over the wells As built well diagrams are shown in Appendix B <br /> 10 2 6 MONITORING WELL DEVELOPMENT AND SURVEY <br /> I On 07 October 2003,monitoring wells MW-1 through MW-4 were developed utilizing a steel bailer <br /> and a Waterra Inertia pump equipped with hose bailer Ground water was purged from each <br /> monitoring well until ground water was visually sediment free Approximately 15 to 20 gallons of <br />' water were removed from each well Groundwater temperature,pH and conductivity were measured <br /> at regular intervals during purging using an Oakton water analyzer Field sheets and data are included <br /> In Appendix C Purged water was stored on-site in properly labeled, 55-gallon DOT-approved <br />' drums <br /> E ' <br /> On 29 October 2004,a California-state-licensed survey engineer from Morrow Surveying surveyed <br />' the location and elevation at the top of the well casing of monitoring wells MW-1 through MW-4 <br /> Elevations were surveyed to the nearest 0 01-foot relative to Stockton benchmark#26, surveyed at <br /> 9 90 feet above mean sea level(MSL) Location coordinates (x and y)were surveyed to the nearest <br />' 0 1-foot using coordinate datum NAD 83 The results of the monitoring well survey are contained <br /> in Table 1 The surveying report (Morrow Surveying) is presented In Appendix D <br /> 2 7Q UARTERLY WELL MONITORING PROCEDURES <br /> The quarterly ground water monitoring event was performed on 09 October 2003, ground water <br /> monitoring was performed on monitoring wells MW-1 through MW-4 <br /> Advanced,GeoEnvironmcntal,Inc <br /> E <br /> t <br /> 1 <br />