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22 Mav 2001 <br /> AGE-NC Project No 95-0167 <br /> 1 Page 5 of 10 <br />' Following the sampling of the soil borings, neat portland cement slurry was placed into each soil <br /> boring using a tremmie pipe The soil bonngs were then filled to surface grade with the portland <br /> slurry <br /> 2 8 MONITORING WELL PURGE PROCEDURES <br /> On 15 November 2000, ground water monitoring and sampling was performed at the site on wells <br />' MW-1 through MW-6 Ground water monitoring procedures for the site were performed as outlined <br /> in Work Plan Addendum- Februari. 2000 dated 04 February 2000 prepared by AGE and approved <br /> by the PHS-EHD by letter dated 09 February 2000 <br />' Depths to ground water were measured in each well from the top of the well casing to the nearest <br /> 0 01-foot utilizing a Solinst water level meter Ground water elevation in each well was calculated <br /> by subtracting the measured depth to ground water from the surveyed casing elevations (Table 3) <br /> Ground water elevations were plotted and contoured on a scaled site map (Figure 5) After recording <br /> water level measurements, a submersible pump was used to purge each monitoring well of standing <br /> water Approximately 8 gallons of water(minimum of 3 casing-water volumes) were removed from <br /> wells MW-1 through MW-4, and 6 gallons of water were removed from wells MW-5 and MW-6 <br /> Ground water temperature,pH and conductivity were measured at regular intervals during purging <br /> using a Hydac water analyzer Field data and logs are in Appendix B Purged ground water was <br /> containerized in labeled, 55-gallon DOT-approved drums and stored at the site <br />' <br /> 29 GROUND WATER SAMPLING <br />' Following well purging, ground water levels in the monitoring wells were allowed to achieve a <br /> minimum of 80 percent recharge prior to sample collection Ground water samples were collected <br />' from the purged wells utilizing new, disposable polyethylene bailers and three 40-m1 EPA-approved <br /> VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative Care was taken to <br /> ensure that visible air bubbles were not present in the vials after filling and capping Ground water <br />' sample containers were labeled with the well designation, date, time, and sampler's initials <br />' - <br /> 210 LABORATORY ANALYSIS OF GROUNDWATER SAMPLES <br /> Each ground water sample was logged on a chain-of-custody form, placed in a chilled container and <br />' transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> for <br /> 1 <br /> Advanced GeoLuvrronmentat,Inc <br />