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21 May 2003 <br />' AGE-NC Protect No 95-0111 <br /> Page 2 of 4 <br />' acid(HCI) as a sample preservative and into one 1-liter amber bottle without a sample preservative <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 /> 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 tertiary-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 /> 12 March 2003, 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 63 feet to 1147 feet below the tops of the well casings in <br />' wells MW-1 through MW-8 Ground water elevations at the site ranged from 8 69 feet above mean ` <br /> sea level (MSL)in well MW-2 to 10 67 feet above MSL in well MW-3 Ground water elevations at <br /> the site decreased an average of 0 53 feet between the December 2002 and the March 2003 sampling <br />' events Wells MW-1 and MW-3 were"drowned", the water level was approximately 0 2 feet and <br /> 1 1 feet above the respective screened intervals <br />' The ground water flow direction was inferred to be towards the north-northwest under a gradient of <br /> approximately 0 009 feet/feet Ground water data from well MW-2 was not used to determine the <br />' ground water flow direction and gradient, the depth to ground water measurement was recorded <br /> incorrectly (Appendix A) and does not correlate with data collected from the other seven wells <br /> Figure 3 illustrates the contoured ground water elevations <br /> 1 <br /> I <br /> �i <br /> Advwrced GeoEnvironmental Inc <br />