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F 4 , 1 1 29 October 199$ , AGE-NC Project No 98-0448 ' Page 4 of 9 ' Following development activities, ground water levels from monitoring wells MW-4 through MW-7 achieved a minimum of 80 percent recharge prior to sample collection Ground water samples were collected from MW-4 through MW-7 utilizing disposable polyethylene bailers and 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 Ground water sample containers were labeled with the well designation, date, time, and sampler's initials Fallowing collection, each sample was logged on a chain-of-custody form, placed in a chilled ' container and transported to a DTSC-certified laboratory for analysis in accordance with • EPA Method 8015M for TPH-g, 4 ' • EPA Method 8020 for BTEX with MTBE, and • EPA Method 8260 for TBA, DIPE, ETBE, TAME, and MTBE , a ' The results of the analysis are contained in Table 4 2 2 QUARTERLY MONITORING AND SAMPLING ACTIVITIES On 16 September 1998, quarterly ground water monitoring and sampling was performed from ' monitoring wells MW-1 through MW-7 Depths to ground water and total well depths from MW-1 through MW-7 were measured to the nearest 0 01-foot utilizing a Solinst water level meter The ' ground water elevations were calculated by subtracting the depth to ground water from the surveyed casing elevations(Table 3) Ground water elevations were plotted and contoured on a scaled site map (Figure 10) ' After water levels were measured, a minimum of three well volumes of ground-water was purged from wells MW-1 through MW-7 utilizing a hand bailer and a two-stage submersible pump ' Temperature,pH and conductivity were measured at regular purge volume intervals utilizing an ICM model 52200 water analyzer to track stabilization of produced water Stabilization data and field logs are contained in Appendix D Purged ground water was stored in 55-gallon drums on-site in an area ' lacking public access The ground water levels from monitoring wells MW-1 through MW-7 achieved a minimum of 80 percent recharge prior to sample collection Ground water samples were collected utilizing disposable polyethylene bailers Ground water samples 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 with the well designation, date, time, and sampler's initials Adramed GeoEnvironmental,Inc