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31 August 2004 <br /> AGE-NC Project No 95-0173 <br /> Page 3 of 10 <br /> I2 2 GROUND WATER SAMPLING <br /> Following well purging,groundwater levels in the wells achieved a mmimum of 80 percent recharge <br /> pnor to sample collection,except for well MW-11 which was purged `dry',but did recharge enough <br /> (about 40%) to collect a water sample Subsequently, ground water samples were collected from <br /> each purged well utilizing new, disposable polyethylene bailers and transferred into 40-ml EPA- <br /> approved volatile organic analysis(VOA)vials containing 0 5 ml 18%hydrochloric acid as a sample <br /> preservative, ground water samples were collected from multi-level well MW-13 (A, B and C) and <br /> air sparge wells AW-1B and AW-2B and poured directly into the 40-m1 VOA vials utilizing the <br /> Waters hose bailer 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 /> I <br /> 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> After labeling,each ground water sample was logged on a chain-of-custody form,placed in a chilled <br /> container and transported to Castle Analytical Laboratory(CAL),a Cali forniaDepartment offlealth <br /> lie Services(DHS)-certified laboratory to be analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline(TPH-g)by EPA Method 5030/8015M, <br /> I • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) by EPA Method 8020, and <br /> • MTBE, tert-amyl methyl ether(TAME),tertiary butanol (TBA), di-isopropyl ether(DIPE), <br /> ethyl tert butyl ether(ETBE), 1,2-dichloroethane(1,2-DCA)and ethylene-dibromide(EDB) <br /> by EPA Method 5030/8260 <br /> 24 QUARTERLY GROUND WATER MONITORING AND SAMPLING FINDINGS <br /> AGE determined ground water flow direction and gradient from the field data collected on 19 March <br /> 2004, the contaminant impact to ground water was assessed from the laboratory data <br /> 2 4 1 GROUND WATER ELEVATION AND GRADIENT <br /> During the March 2004 ground water monitoring event, the depths to ground water were measured <br /> at between 28 35 and 30 85 feet below the tops of the well casings (Table 2), ground water <br /> IAdvanced GeoEnvironmental,Inc <br /> I <br />