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I 25 August 1999 • I AGE-NC Project No 98-0448 Page 4 of 10 bailer and a two-stage submersible pump Approximately 10 gallons of ground water was purged from monitoring well MW-8 until ground water produced was visually sediment free, approximately 50 gallons was purged from EW-1 Purged ground water was containerized in properly labeled D O T -approved model 17H 55-gallon drums and was stored on-site in an area lacking public access Monitoring well field logs for development activities are included in Appendix B I , 2 2 QUARTERLY MONITORING AND SAMPLING ACTIVITIES On 22 June 1999, ground water monitoring and sampling was performed on ground water wells MW-1 through MW-8 Depths to ground water and total well depths were measured to the nearest ' 0 01-foot utilizing a Solinst water level meter Ground water elevations were calculated by subtracting the depth to ground water from the surveyed casing elevations (Table 2), ground water elevations were plotted and contoured on a scaled site plan (Figure 3) After water levels were measured between 9 and 16 gallons of round water a minimum of three g g ( ' • well-volumes per well)were removed from wells MW-1 through MW-8 utilizing a submersible two- stage submersible pump, during ground water evacuation (purging), ground water was pumped near the top of each water column to ensure the removal of all stagnant water Temperature, pH and ' conductivity were measured for stabilization at regular purge volume intervals from each well using an ICM Model 52200 water analyzer Field data and logs are included with Appendix B Purged ground water was containerized in 55-gallon drums and was stored on-site in an area lacking general ' public access Following ground water purging activities, ground water levels from wells MW-1 through MW-8 ' achieved a minimum of 80 percent recharge prior to ground water sample collection Ground water samples were collected utilizing disposable polyethylene bailers Groundwater samples from MW-1 through MW-8 were transferred into EPA-approved 40-m1 VOA vials containing 0 5 ml 18% ' hydrochloric acid as a sample preservative Care was taken to ensure that visible air bubbles were not present in the VOAs after filling and capping The ground water sample containers were labeled w ' with the well designation, date, time, and sampler's initials Following collection, each sample was logged on a chain-of-custody form, placed in a chilled ' container and transported to a DHS-certified laboratory for analysis in accordance with • EPA Method 8015 Modified for TPH-g , ' • EPA Method 8020 for BTEX with MTBE, and • ' Advanced GeoEmiron mcntal,Inc 1 c