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al <br /> 11 July 2002 <br /> • AGE-NC Project No 96-0254 <br /> Page 2 of 4 <br /> 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> The depth to ground water was re-measured in each well following evacuation to assure a minimum <br />' of 80% recharge prior to sampling, well MW-7 was the only well that was purged dry and did not <br /> recharge 80% after six hours <br /> Water samples were subsequently collected using new disposable plastic bailers Water samples <br /> collected from wells MW-IA,MW-2A,MW2B and MW3 through MW-7 were transferred into one <br /> 1-liter amber bottle and the water samples from well MW-1 B was transferred into two 1-liter amber <br /> bottles, all without a sample preservative Additionally, water samples from each well were <br /> transferred into three chilled 40-m1 volatile organic analysis (VOA) vials containing 0 5 ml 18% <br /> hydrochloric acid (HCl) as a sample preservative <br /> After collection,the samples were labeled and placed in a chilled container for transportation under <br /> chain-of-custody to Me Campbell Analytical,Inc (MAI),a California Department of Health Services <br /> (DHS)-certified analytical laboratory The ground water samples were analyzed for <br /> • • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) in <br /> faccordance with EPA Method 8015 Modified <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) in accordance with EPA Method 8020 <br /> • Fuel additives, including, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> MTBE,tertiary-amyl methyl ether(TAME),tertiary-butyl alcohol(TBA), 1,2-dichloroethane <br /> (1,2-DCA)and ethylene dibromide(EDB) in accordance with EPA Method 8260 Modified <br /> The Grant Line Gas and Fuel well GLMW-3 had been sampled on 26 December 2001 and was not <br /> sampled during this monitoring event <br />' 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 23 April 2002, the contaminant impact to ground water was assessed from the laboratory analytical <br /> data obtained from the sampling event <br /> I <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> IThe elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> ifrom the surveyed well casing elevations (Table 1) <br /> Advanced GeoE nvi ron mental Inc <br />