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r i <br /> • 12 July 2001 <br /> AGE-NC Protect No 95-0111 <br />' Page 2 of 4 <br /> organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid (HCl) as a sample <br /> preservative <br />' The samples were then labeled and placed in a chilled container for transportation under <br /> chain-of-custody to McCampbell Analytical,Inc (MAI),a California Department of Health Services <br /> (DHS)-certified analytical laboratory located in Pacheco, California 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 /> • Volatile aromatic compounds-benzene,toluene,ethylbenzene and total xylenes (BTEX)and <br /> methyl tertiary-butyl ether(MTBE)by EPA Method 8020, and <br />' • Oxygenated compounds - di-isopropyl ether (RIPE), ethyl tertiary-butyl ether (ETBE), <br /> MTBE, tertiary-amyl methyl ether (TAME) tertiary-butyl alcohol (TBA) by EPA Method <br />' 8260 Modified <br /> 3.0. FINDINGS <br />' Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 22 June 2001, the contaminant impact to ground water was assessed from the laboratory analytical <br /> data <br /> 3 I 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 depth to ground water ranged from 6 44 feet to 9 64 feet below the tops of the well casings <br /> Ground water elevations at the site ranged from 9 50 feet above mean sea level (MSL) in well MW-6 <br /> to 10 83 feet above MSL in well MW-3 Ground water elevations at the site decreased an average <br /> of 0 04 feet between the March 2001 and June 2001 sampling events Ground water levels were <br /> within the screened intervals of wells MW-2, and MW-4 through MW-8 and approximately 0 36 feet <br /> and 128 feet above the screened intervals in wells MW-1 and MW-3, respectively <br /> The ground water flow direction is inferred to be towards the north-northwest under an average <br /> Ihydraulic gradient of 0 007 feet/feet Figure 3 illustrates the contoured ground water elevations <br /> I <br /> Advanced GeoEnvtronmental Inc <br />