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' fel 1 <br /> • 06 August 2002 <br /> AGE-NC Project No 95-0111 <br />' Page 2 of 4 1 , t <br /> The samples were then labeled and placed in a chilled container for transportation under <br />' chain-of-custodyto McCampbell Analytical,Inc (MAI),a California Department of Health Services <br /> (DHS)-certified analytical laboratories Each sample was analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline and diesel(TPH-g and TPH-d)by EPA <br /> Methods 5030/8015 Modified and 3550/8015 Modified, respectively, <br />' • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) by EPA Method 8020, and <br /> 1 • The fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, <br /> tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dichloroethane <br /> (1,2-DCA) and ethylene dibromide (EDB)by EPA Method 8260 Modified <br /> 1 <br />' 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br />' • 21 June 2002,the contaminant impact to ground water was quantified from the laboratory analytical <br /> data <br />' 3 1 GROUND WATER FLOW DIRECTION AND GRADIENT <br />' The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed well casing elevations (Table 1) <br /> The depths to ground water ranged from 6 21 feet to 9 43 feet below the tops of the well casings <br /> Ground water elevations at the site ranged from 9 68 feet above mean sea level(MSL)in well MW-6 <br /> to 1106 feet above MSL in well MW-3 Ground water elevations at the site increased an average <br />' of 0 22 feet between the April 2002 and June 2002 sampling events Wells MW-1 and MW-3 were <br /> "drowned",the water level was approximately 0 57 feet and 151 feet above the respective screened <br /> Intervals <br /> The ground water flow direction was Inferred to be towards the north on-site under an average <br /> gradient of 0 009 feet/feet and towards the north-northwest lust north of the site under an average <br /> gradient of 0 007 feet/feet Figure 3 illustrates the contoured ground water elevations <br /> • <br /> 1 <br /> Advanced GcoEnvironmental Inc <br /> 1 <br />