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' 01 May 2003 • AGE-NC Protect No 97-0326 ' Page 2 of 4 ' (CTEL), a California Department of Health Services (DHS)-certified analytical laboratory for analysis The samples were analyzed for ' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) In accordance with EPA Method 8015 Modified • Benzene, toluene, ethylbenzene and total xylenes (BTEX) in accordance with EPA Method ' 8260B • The fuel additives di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), methyl ' tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dibromoethane(EDB)and 1,2-dichloroethane(1,2-DCA),methanol and ethanol In accordance with EPA Method 8260B 1 ' 3.0. FINDINGS Ground water elevation, and flow direction were determined from field data Hydrocarbon-impact ' to ground water was quantified by laboratory analysis of ground water samples 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION Ground water was measured at an average depth of approximately 35 03 feet below the well heads ' during the January 2003 monitoring event The water level is within the screened intervals of MW2 and MW3, but approximately 0 26 feet above the screened interval in NIW1 The elevation of ground water in each well was calculated by subtracting the depth to ground water from the well head elevations Ground water elevations ranged from 20 18 (MW2) to 20 24 feet (MW3) below mean sea level (MSL) Ground water data is summarized on Table 1 Ground water elevation contours based on the data for the January 2003 monitoring event are ' illustrated on Figure 2 The ground water flow direction was south-southeast with a hydraulic gradient of 0 003 feet/feet ' 3 2 ANALYTICAL RESULTS OF WATER SAMPLES ' TPH-g was detected m samples collected from MW1, MW2 and MW3 at concentrations of 150,000 micrograms per liter (µg11), 77,000 µg11 and 50,000 µg11, respectively 1 Advanced GeoEnvironmental,Inc