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I 1 <br /> 06 June 2003 <br /> • AGE-NC Project No 97-0301 <br /> Page 2 of 5 <br /> ' 2 2 GROUND WATER SAMPLING <br /> Following well purging,ground water levels at all wells achieved a minimum of 80 percent recharge <br /> ' prior to sample collection Ground water samples were collected from the purged wells utilizing <br /> new, disposable polyethylene bailers and transferred into 1-liter amber bottles without sample <br /> preservative and 40-m1 EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a <br /> ' sample preservative Care was taken to ensure that visible air bubbles were not present in the vials <br /> after filling and capping Ground water sample containers were labeled with the well designation, <br /> date, time, and sampler's initials <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> ' <br /> Following collection and labeling,each ground water sample was togged on a chain-of-custody form, <br /> placed in a chilled container and transported to a McCampbell Analytical, Inc , a California <br /> ' Department of Health Services (DHS)-certified laboratory, for analysis for <br /> t Total petroleum hydrocarbons quantified as gasoline,diesel,kerosene and motor oil(TPH-g, <br /> TPH-d, TPH-k and TPH-mo respectively)by EPA Methods 8015C/5030B/3510C, <br /> • Benzene,toluene,ethyl benzene and xylene(BTEX)and methyl tertiary-butyl ether(MTBE) <br /> ' by EPA Method 8021 B, and <br /> • 1,2-Dichloroethane(1,2-DCA),ethylene dibromide(EBD),di-isopropyl ether(DIPE),ethyl <br /> ' tert butyl ether(ETBE),MTBE,tert amyl methyl ether(TAME), tertiary butanol(TBA)by <br /> EPA Method 8260E <br /> 3.0. FINDINGS <br /> ' Ground water elevation,flow direction and gradient were determined from field data collected on 02 <br /> December 2002 The contaminant impact to ground water was quantified by the ground water <br /> ' laboratory data <br /> ' 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water in wells MW-1 through MW-7 were measured at between 32 33 and <br /> 33 04 feet below the tops of well casings The ground water elevations were calculated to be between <br /> . 19 93 feet(MW-2) and 20 14 feet (MW-5)below mean sea level The ground water elevation data <br /> obtained during this monitoring event are depicted in Figure 3 The inferred ground water flow <br /> ' Advanced GenEnveronmental,Inc <br />