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1 <br /> . 26 February 2003 <br />' AGE-NC Project No 95-0111 <br /> Page 2 of 4 <br />' dedicated,disposable plastic bailer and transferred into three chilled 40-m1 volatile organic analysis <br /> (VOA) vials containing 0 5 ml 18% hydrochloric acid (HCl) as a sample preservative and into one <br /> 1-liter amber bottle without a sample preservative The samples were labeled and placed in a chilled <br />' container for transportation under chain-of custody to McCampbell Analytical, Inc (1YW, a <br /> California Department ofHealth Services(DHS)-certified analytical laboratories Each sample was <br />' analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline, diesel and motor oil (TPH-g, TPH-d <br /> and TPH-mo) by EPA Method 8015 Modified, <br />' • Benzene,toluene,ethylbenzene and total xylenes(BTEX)and the fuel additives di-isopropyl <br /> ether (DIPE), ethyl tertiary--butyl ether (ETBE), methyl ternary-butyl ether (MTBE), <br />' tertiary-amyl methyl ether (TAME), and tertiary-butyl alcohol (TBA) by EPA Method <br /> 8260B <br />' 3.0 FINDINGS <br />' Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 19 December 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 /> 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 04 feet to 9 17 feet below the tops of the well casings <br />' Ground water elevations at the site ranged from 10 08 feet above mean sea level (MSL) in well <br /> MW-6 to 1141 feet above MSL in well MW-3 Ground water elevations at the site increased an <br /> average of 0 60 feet between the September 2002 and the December 2002 sampling events Wells <br /> MW-1 and MW-3 were "drowned", the water level was approximately 0 8 feet and 1 4 feet above <br /> the respective screened intervals <br /> The ground water flow direction was inferred to be towards the north-northwest under a gradient of <br /> approximately 0 008 feet/feet, Figure 3 illustrates the contoured ground water elevations <br /> Advanced GeoErnvironn=tal Inc <br />