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1 <br /> 20 July 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 /> • TotalY <br /> etroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> P <br /> Method 5030/8015 Modified <br /> 1 • Volatile aromatic hydrocarbons-benzene,toluene,ethylbenzene and total xylenes (BTEX) <br /> and methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 8020 <br />' • 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 5260 Modified <br /> e Ethylene dibromide (EDB) and 1,2 dichloroethane (1,2 DCA) in accordance with EPA <br /> Method 8260 <br /> 3.0. 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 />' June 2001 monitoring event, within the screened intervals of MW2 and MW3, but approximately <br /> 3 feet above the screened interval in MW1 The elevation of ground water in each well was <br /> calculated by subtracting the depth to ground water from the well head elevations Ground water <br /> televations ranged from 16 92 to 16 99 feet below mean sea level (MSL) Ground water data is <br /> summarized on Table 1 <br />' Ground water elevation contours based on the data for the June 2001 monitoring event are illustrated <br /> on Figure 2 The ground water flow direction was south-southeast with a gradient of 0 0034 ft/ft <br /> 1 <br /> 3 2 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH-g was detected in samples collected from MW 1,MW2 and MW3 at concentrations of 54,000 <br /> micrograms per liter (4g11), 48,000 Fig/l. and 130,000 µg/1, respectively Benzene was detected in <br /> Advanced GeoEnv:ronmentai,Inc <br /> t <br />