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30 July 2004 <br /> j <br /> i AGE-NC Project No 95-0121 r <br /> 1, <br /> =Page 3 of 6 . _ - <br /> j , <br /> , I _ <br /> 2 3 GROUND WATER SAMPLING - T <br /> Following well purging , ground water Ievels,at wells MW-1 through MW-9 and VW-2 achieved " <br /> a minimum of 80 percent recharge prior to sample collection,well VW-1 was not sampled due to <br /> detection of floating petroleum product, wells VW-3 through VW-7 did not achieve 80%recharge <br /> due to being purged `dry' Ground water samples were collected from the purged wells utilizing the <br /> I dedicated, disposable bailers and transferred into 1-liter amber bottles without sample preservative <br /> and'40-m1 EPA-approved volatile organic analysis(VOA)vials containing 0 5-ml 18%hydrochloric <br /> acid as a sample preservative Care was taken to ensure that visible air bubbles were not present in <br /> the vials after filling and capping Ground water sample containers were labeled with the well <br /> designation, date, time, and sampler's initials <br /> 2 4 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> IFollowing collection and labeling,each ground water sample was logged on a chain of custody form, <br /> placed in a chilled container and transported to Ca1,Tech Environmental Laboratories, a California <br /> Department of Health Services (DHS)-certified laboratory, for analysis for ` <br /> • Total petroleum hydrocarbons ,quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively) by EPA Methods 8015M, and <br /> • Benzene, toluene, ethylbenzene and xylene (BTEX), methyl tert butyl ether (MTBE), di- <br /> isopropyl ether (D1PE), ethyl tert butyl;ether (ETBE), tert amyl methyl ether (TAME), <br /> tertiary butanol (TBA), ethylene dibromide (EDB) and,1,2-dichloroethane (1,2-DCA) by <br /> EPA Method 8260B + <br /> 1 , <br /> 3.0. FINDINGS <br /> e <br /> Ground water elevation,flow direction and gradient were determined from field data collected on 22 <br /> December 2003 The contaminant impact to,ground water was quantified by the ground water <br /> Ilaboratory data"collected on 23 December 2003 r <br /> 1 <br /> r , <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water in wells MWA through MW-9 and VW-1 through VW-7 were measured <br /> Iat between I7 30 and 19 21 feet below the tops of well casings The ground water elevations were <br /> calculated to be between 10 32 feet (VW-7) and 12 35 feet (MW-8) below mean sea level (MSL) <br /> « , <br /> Advanced GeoEnviron mental,Inc <br />