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' 27 July 1998 <br /> • AGE-NC Project No 95-0104 <br />' Page 2 of 4 <br /> 2 2 GROUND WATER SAMPLING <br />' Following purging, ground water levels in monitoring wells MW-1 MW-5 MW-6 and VW-I <br /> achieved a minimum of 80 percent recharge prior to sample collection Ground water samples were <br />' collected from the four purged wells utilizing new, disposable polyethylene bailers and three 40-m1 <br /> EPA-approved VOA vials containing 0 5 ml preservative Care was taken to ensure that visible air <br />' bubbles were not present in the vials after filling and capping Ground water sample containers were <br /> labeled with the well designation, date, time, and sampler's initials <br />' 23 LABORATORY ANALYSIS OF GROUND WATER 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 state-certified laboratory for analysis in accordance with <br />' • EPA Method 5030/8015M for total petroleum hydrocarbons quantified as gasoline (TPH-g), <br /> • EPA Method 602/8020 for volatile aromatics (benzene, toluene, ethyl benzene and xylene <br />' BTE&X) with methyl-tertiary butyl ether (MTBE), and <br /> • EPA Method 8260B for oxygenated compounds di-isopropyl ether (DIPE), ethyl tertiary <br /> butyl ether (ETRE), tert-amyl methyl ether(TAME), tert-butanol (TBA) and confirmation <br />' of MTBE <br /> The laboratory report (Alpha Analytical Laboratories Inc Batch No 98-0610-008 and Kiff <br />' Analytical Report No 11743) and chain-of-custody forms are presented in Appendix B <br /> 3.0. FINDINGS <br />' 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water from wells MW-I through MW-6 and VW-I were measured between <br />' 53 56 and 54 52 feet below the top of well casings Between September 1997 and June 1998, ground <br /> water elevation has increased an average 16 15 feet at the site The ground water elevation data for <br /> MW-1 through MW-6 and VW-1 during the June 1998 ground water monitoring event is depicted <br />' in Figure 3 <br /> During the June 1998 monitoring event, ground water was approximately 8 54 feet to 26 44 feet <br />' above the top of the screened intervals of monitoring wells MW-2 through MW-6 As a result, the <br /> screened intervals from these wells are completely submerged, and may not yield water samples <br />' Advanced GeoEnvironmental,Inc <br /> I <br />