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20 August 2002 <br /> • AGE-NC Project No 97-0326 <br /> Page 2 of 4 <br />' (CTEL), a California Department of Health Services (DHS)-certified analytical laboratory for <br /> analysis The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> f (MTBE) in accordance with EPA Method 8021 <br /> • The 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 8260 Modified <br />' • Ethylene dlbromlde (EDB) and 1,2 dlchloroethane (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 Iaboratory analysis of ground water samples <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' Ground water was measured at an average depth of approximately 32 75 feet below the well heads <br /> during the April 2002 monitoring event The water level Is within the screened Intervals of MW2 <br />' and MW3, but approximately 2 5 feet above the screened Interval In MW1 <br /> The elevation of ground water In each well was calculated by subtracting the depth to ground water <br />' from the well head elevations Ground water elevations ranged from 17 96 to 18 05 feet below mean <br /> sea level (MSL) Ground water data Is summarized on Table 1 <br />' Ground water elevation contours based on the data for the April 2002 monitoring event are <br /> Illustrated on Figure 2 The ground water flow direction was south-southeast with a gradient of <br /> 0 002 ft/ft <br /> 1 <br /> 1 <br /> Advanced GeoEnvironmental,Inc <br />