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1 <br />' 14 January 2003 <br /> AGE-NC Project No 95-0111 <br />' Page 2 of 4 <br /> The samples were labeled and placed in a chilled container for transportation under chain-of-custody <br />' to McCampbell Analytical,Inc (MAI),a California Department of Health Services(DHS)-certified <br /> 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 />' • The fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, <br /> tertiary-amyl methyl ether (TAME), and tertiary-butyl alcohol (TBA) by EPA Method <br /> 8260 Modified <br /> I <br /> 3.0. FINDINGS <br />' Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 19 September 2002, the contaminant impact to ground water was quantified from the laboratory <br />'• analytical data <br />' 3 1 GROUND WATER FLOW DIRECTION AND GRADIENT <br /> I 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 /> I The depth to ground water ranged from 6 55 feet to 9 76 feet below the tops of the well casings <br /> Ground water elevations at the site ranged from 9 41 feet above mean sea level(MSL)in well MW-6 <br /> to 10 74 feet above MSL in well MW-3 Ground water elevations at the site decreased an average <br />' of 0 31 feet between the June 2002 and September 2002 sampling events Wells MW-1 and MW-3 <br /> were "drowned", the water level was approximately 0 24 feet and 1 19 feet above the respective <br /> screened intervals <br /> IThe ground water flow direction was inferred to be towards the north-northwest under a gradient of <br /> approximately 0 009 feet/feet, Figure 3 illustrates the contoured ground water elevations <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> I . TPH-g was not detected at or above laboratory reporting limits in the ground water samples TPH-d <br /> was detected in the ground water samples collected from wells MW-4 and MW-5 at concentrations <br /> Advanced GeoEnvironmental Inc <br />