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31 July 2000 <br /> AGE-'NC Project No. 95-0130 <br /> P a-ge'51 of 9. . <br /> 3.0. QUARTERLY GROUND WATER MONITORING AND SAMPLING <br /> On.21 June 2000,,ground water monitoring-and sampling was performed at wells MW4 MW-2, <br /> MW-3, MW-4, MW-5, VW=1B; VW-1C,.VW-2A, VW-2B, VW-3A and VW-3B. Ground water , <br /> monitoring procedures for the site were outlined in Work Plan Addendum,-dated 08 November 1995 <br /> and were approved by the PHS-EHD by letter dated 27 November 1995. <br /> -- <br /> 11. MONITORING WELL PURGE PROCEDURES <br /> Depths to groundwater were measured in each well from,the'tops-ofthe-well casings at the:site'to <br /> the nearest 0.01.foot utilizing a Solinst water.level meter. The groundwater elevation_ in each well <br /> at the site was calculated by subtracting the measured depth to groundwater from the.surveyed; <br /> casing elevation(Table 3). Ground water elevations were plotted and contoured orI a scaled site map <br /> (Figure 9). <br /> After water levels were measured, approximately 1 to 21 gallons of ground water(a minimum of <br /> three casing water volumes per well) were removed from wells NIW=1,'MW-2,.MW-3,.MW-4, , <br /> MW-S;VW.-1B,VW-1C,VW-2A VW-2B,VW-3A and VW-3B utilizing a disposable polyethylene <br /> bailer:or submersible pump. Temperature,pH and conductivity were measured for stabilization at <br /> regular purge-volume intervals from each well using a Hydac water analyzer: Fielddata and logs are. <br /> included with Appendix A. Purged -55ground water,was containerized in. -gallon drums.and was <br /> stored on-site in an area lacking general public access; <br /> 3.2. GROUND WATER SAMPLING . <br /> Following well purging,.ground water levels from each well achieved a minimum of 80 percent <br /> recharge prior to sample collection. Ground water,samples.were.collected from.the purged wells <br /> utilizing;new,disposable polyethylene bailers and four.40-mI EPA-approved VOA vials containing <br /> 0.5 ml 18% hydrochloric acid as a preservative. Care was taken to-ensure that visible air bubbles' <br /> were not present in the vials,after filling and capping. Ground.water sample containers were labeled ` <br /> R with the well designation, date;time; and sampler's initials. <br /> 33. LABORATORY ANALYSIS OF GROUND WATER SAMPLES ' <br /> Each ground water sample was logged on a chain-o£custody form,'placed in-a chilled container and' : <br /> transported t6a. DHS-certified laboratory for"analysis for- <br /> Advanced GeoEnvlroni ntal,Inc. <br />