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I04 February 2001 <br /> • AGE-NC Project No 95-0104 <br /> IPage 2 of 3 <br /> water sample was transferred into three 40-m1 VOA vials containing 0 5 ml 18%hydrochloric acid <br /> as a sample preservative and into one 1-liter amber bottle without added preservative The samples <br /> were properly labeled, placed in a chilled container and transported under chain-of-custody to <br /> McCampbell Analytical, Inc (MAI) a State of California Department of Health Services <br /> (DHS)-certified analytical laboratory The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Methods 5030/355018015-Modified, <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) in accordance with EPA Method 8020, and <br /> • Fuel additives - MTBE, di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), <br /> tertiary-amyl methyl ether(TAME), tertiary butanol (TBA), 1,2-dichloroethane (1,2-DCA) <br /> and ethylene dibromide (EDB) in accordance with EPA Method 8260M <br /> 3.0. FINDINGS j <br /> �i <br /> Ground water elevation, flow direction, and gradient were determined from field data collected an <br /> 26 December 2001, the contaminant impact to ground water was assessed from the laboratory <br /> analytical data obtained from the sampling event <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> Ifrom the surveyed well casing elevations (Table 1) <br /> I The depth to ground water ranged from 64 96 feet to 66 03 feet below the tops of the well casings <br /> Ground water elevations at the site ranged from 33 79 feet above mean sea level (MSL) in wells <br /> MW-4, MW-5 and MW-6 to 33 97 feet above MSL in well VW-1 Groundwater elevations at the <br /> site decreased an average of 2 43 feet between the June 2001 and December 2001 sampling events <br /> The ground water flow direction is inferred to be generally towards the northeast under an average <br /> Igradient of 0 006 feet/feet Figure 3 illustrates the contoured ground water elevations <br /> IAdvanced Geo Envi ron mental,Inc <br /> I <br />