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' 25 January 2001 <br /> AGE-NC Project No 97-0326 <br />' Page 2 of 4 <br />' a chilled container under chain of custody to McCampbell Analytical, Inc (MAI), a California <br /> Department of Health Services(DHS)-certified analytical laboratory for analysis The samples were <br /> analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline (TPH- in accordance with EPA <br /> 9 g g) <br /> Method 5030/8015 Modified <br />' • Volatile aromatic hydrocarbons - benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> with methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 8020 <br />' o Oxygenated compounds - di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> MTBE, tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), methanol and ethanol <br />' in accordance with EPA Method 8260B <br /> Ethylene dibromide (EDB) and 1,2 dichloroethane (1,2 DCA) in accordance with EPA <br /> Method 8260 <br />'. 30 FINDINGS <br /> Ground water elevation, and flow direction were determined from field data, hydrocarbon-impact <br /> to ground water was assessed by laboratory analysis of ground water samples <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> Ground water was measured at a depth of approximately 32 feet below the well heads during the <br /> December 2000 monitoring event, within the screened intervals of MW2 and MW3, but <br /> approximately 3 feet above the screened interval in MW l The elevation of ground water in each <br /> I well was calculated by subtracting the depth to ground water from the well head elevations Ground <br /> water elevations ranged from 17 29 to 17 36 feet below mean sea level (MSL) Ground water data <br /> is summarized on Table 1 <br /> Ground water elevation contours based on the data for the December 2000 monitoring event are <br /> illustrated on Figure 2 The ground water flow direction was south-southeast with a gradient of <br /> 0 0032 ft/ft <br /> r <br /> Advanced GeoEnvi ron mental,Inc <br /> I <br />