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03 June 2002 <br /> AGE-NC Project No 99-0657 <br />' Page 2 of 4 <br /> collection, the samples were properly labeled, placed in a chilled container and transported under <br />' chain-of-custody to Cal Tech Environmental Laboratories (CTEL), a California Department of <br /> Health Services-certified analytical laboratory, for analysis The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Methods 8015-modified for fuels, <br /> • Benzene,toluene,ethylbenzene and xylenes(BTEX)and methyl tertiary-butyl ether(MTBE) <br /> in accordance with EPA Method 8021, <br /> • The fuel additives MTBE, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> tertiary-amyl methyl ether(TAME), tertiary butanol (TBA), 1,2-dichloroethane (1,2-DCA) <br /> and ethylene dibromide (EDB) in accordance with EPA Method 8260B <br /> 3.0. FINDINGS <br /> I <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> I• 04 April 2002, the contaminant impact to ground water was quantified by laboratory analysis of the <br /> ground water samples <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the Apnl 2002 sampling event, depths to ground water ranged from 33 32 feet to <br /> 34 40 feet below the tops of the well casings Ground water elevations at the site ranged from <br /> 7 77 feet above mean sea level(MSL)in well MW4 to 8 04 feet above MSL in well MW2 (Table 1) <br />' During this monitoring event, the ground water levels in the wells were approximately 4 40 to 9 32 <br /> feet below the tops of the well screens, indicating that the wells are screened properly to yield <br /> representative shallow ground water samples The ground water elevation at the site Increased an <br /> Iaverage of 0 07 feet between the January 2002 and April 2002 monitoring events <br /> Ground water was inferred to be flowing toward the southwest under an average gradient of <br /> 0 004 feet/feet Figure 3 illustrates the contoured ground water elevations as measured on <br /> 04 April 2002 <br /> Advanced GeoEnvkronmentai,Inc <br /> I <br />