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' 30 March 1999 <br /> • AGE-NC Project No 95-0173 <br />' Page 2of5 <br />' 2 2 GROUND WATER SAMPLING <br /> Following purging,ground water levels in monitoring wells MW-1 through MW-12,VW-1,AW-IB <br />' and AW-2B were allowed to achieve a minimum of 80 percent recharge prior to sample collection <br /> Ground water samples were collected from the purged wells utilizing new, disposable polyethylene <br /> bailers, one 1-liter amber bottle and four 40-m1 EPA-approved VOA vials containing 0 5 ml 18% <br />' hydrochloric acid as a preservative Care was taken to ensure that visible air bubbles were not <br /> present in the vials after filling and capping Ground water sample containers were labeled with the <br /> well designation, date, time, and sampler's initials <br /> 1 <br /> 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br />' Each round water sample was logged on a cham-of-custody form, laced In a clulled container and <br /> g p gg Y p <br /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> in accordance with <br /> Ps <br /> • EPA Method 8015M for total petroleum hydrocarbons quantified as gasoline and diesel <br /> (TPH-g and TPH-d, respectively), <br /> • EPA Method 8020 for volatile aromatics (benzene, toluene, ethyl benzene and xylene <br />' BTEX) with methyl-tertiary butyl ether(MTBE), and <br /> • EPA Method 8260 for tertiary butanol (TBA), di-isopropyl ether (DIPS), ethyl tert butyl <br />' ether (ETBE), tert amyl methyl ether (TAME) and MTBE <br />' 30. FINDINGS <br />' From the field data, AGE was able to determine the ground water flow direction and gradient <br /> Laboratory analysis detected petroleum hydrocarbons in twelve ground water samples, oxygenated <br /> fuel additives were detected in four ground water samples <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> During the January 1999 monitoring event, depths to ground water from wells MW-i through MW- <br /> 12,VW-1,AW-1 B and AW-213 were measured between 24 06 and 26 3 5 feet below the tops of well <br /> • casings, ground water elevations were calculated to be between 15 44 feet and 16 23 feet below <br /> mean sea level Ground water elevation at the site increased an average 0 88 feet between the <br /> Advanced G ceEnviron mental,Inc <br /> I <br />