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09 September 1996 AGE-NC Project No 95-0173 ' Page 4 of 8 ' auger The filter pack was placed adjacent to the screen (0 020 inch screen size) from the bottom of the boring to a point approximately 2 feet above the top of the screen An approximate three-foot seal of bentonite clips was placed above the filter pack and hydrated with clean tap water The remairung annular space was sealed with grout As-built monitoring well construction diagrams are included as Figure Nos 3 through 6 -Moniloy mg Well Con struction Drag ant 3 6 SURVEYING ' A reference point was marked on the top of each well head, and surveyed the to the nearest 0 01 foot to determine the elevation relative to existing wells The results of the monitoring well survey are contained in Table 3 -Relative G ound Water Elevations I3 7 MONITORING WELL DEVELOPMENT On 02 August 1996, monitoring wells MW-1 through MW-4 were developed utilizing a two-stage submersible pump Ground water was purged from each well until each well was essentially sediment free Approximately 20 gallons of ground water were purged from each monitoring well Purged ground water was containerized in properly labeled D O T model 17H 55-gallon drums and stored on-site in an area inaccessible to the general public 3 8 QUARTERLY MONITORING AND SAMPLING On 05 August 1995, ground water levels and total well depths at MW-1 through MW-4 were measured to the nearest 0 01 foot utilizing a Solist water level meter Ground water surface elevations were plotted on a scaled site map, whereupon ground-water surface elevation contours were generated (Figure 7 - Relative Ground Watei Elevations) Ground water monitoring at tlus time Iindicated that ground water flow beneath the site was generally to the northeast at a gradient of about 0 002, or approximately 12 feet per mile After water levels were measured approximately six to eight gallons of ground water (a minimum of three well volumes) were purged from MW-I through MW-4 utilizing a two-stage submersible pump Temperature, pH and conductivity were measured at well volume intervals using an ICM model 52200 water analyzer Stabilization data and field logs are included in Appendix B Purged ground water was stored in 55-gallon drums stored on-site in an area inaccessible to the general public Monitoring wells MW-1 through MW-4 were purged and allowed to recover for a minimum of one Ihour prior to sample collection Ground water samples were collected from MW-I through MW-4