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' 06 May 2002 . AGE-NC Project No 95-0111 Page 2 of 4 ' The samples were then labeled and placed in a chilled container for transportation under chain-of-custodyto McCampbell Analytical,Inc (MAI),a California Department of Health Services (DHS)-certified analytical laboratories Each sample was analyzed for ' • Total petroleum hydrocarbons quantified as gasoline and diesel(TPH-g and TPH-d)by EPA Methods 5030/8015 Modified and 3550/8015 Modified, respectively, ' • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether (MTBE) by EPA Method 8020, and ' • The fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dichloroethane (1,2-DCA) and ethylene dibromide (EDB) by EPA Method 8260 Modified I ' 3.0 FINDINGS Ground water elevation, flow direction, and gradient were determined from field data collected on ' • 21 April 2002,the contaminant Impact to ground water was quantified from the laboratory analytical data I3 1 GROUND WATER FLOW DIRECTION AND GRADIENT I The elevation of ground water In each well was calculated by subtracting the depth to ground water from the surveyed well casing elevations (Table 1) ' The depth to ground water ranged from 6 42 feet to 9 91 feet below the tops of the well casings Ground water elevations at the site ranged from 9 67 feet above mean sea level(MSL)in well MW-6 to 10 89 feet above MSL in well MW-3 Ground water elevations at the site decreased an average ' of 0 40 feet between the December 2001 and April 2002 sampling events Wells MW-1 and MW-3 were "drowned", the water level was approximately 0 1 foot and 1 3 feet above the respective screened Intervals Is Inferred to be towards the north-northwest under an e avers The ground water flow directiong ' gradient of 0 008 feet/feet Figure 3 Illustrates the contoured ground water elevations I Advanced GeoEnvironmental Inc