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08 March 1999 <br /> AGE-NC Project No 95-0130 <br /> Page 2 of 5 <br /> ' 2 2 GROUND WATER SAMPLING <br />' Following well purging, ground water levels in monitoring wells MW-1 through MW-5, VW-1C, <br /> VW-2A and VW3-A achieved a minimum of 80 percent recharge prior to sample collection Ground <br /> water samples were collected from the purged wells utilizing new, disposable polyethylene bailers <br />' and three 40-m1 EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a <br /> preservative Care was taken to ensure that visible air bubbles were not present In the vials after <br /> filling and capping Ground water sample containers were labeled with the well designation, date, <br /> time, and sampler's initials <br />' 2 3 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 Castle Analytical Laboratory and McCampbelI Analytical Inc , California Department <br /> of Health Services (DHS)-certified laboratories for analysis In accordance with <br /> - EPA Method 8015M for total petroleum hydrocarbons quantified as gasoline (TPH-g), <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 confirmation of MTBE <br />' 3.0. FINDINGS <br />' AGE was able to determine ground water flow direction and gradient from the field data Laboratory <br /> analysis detected petroleum hydrocarbons in six of eight ground water samples, oxygenated fuel <br /> additives were detected in six of eight ground water samples <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water from wells MW-i through MW-5, VW-I C, VW-2A and VW-3A were <br /> measured between 39 47 and 40 50 feet below the top of well casings on 22 December 1998 Ground <br /> water elevations were calculated to be between-23 72 and -24 23 feet below mean sea level, ground <br /> water elevations are depicted In Figure 3 Ground water elevation at the site Increased an average <br /> 0 68 feet between the September 1998 and the December 1998 ground water momtonng events The <br /> Advanced GcoEn%ironmental,Inc <br />