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31 July 2003 <br /> AGE-NC Project No 97-0326 <br /> Page 2 of 4 <br />' Environmental Laboratories (CTEL), a California Department of Health Services (DHS)--certified <br /> analytical laboratory for analysis The samples were analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline (TPI -g) in accordance with EPA <br /> Method 8015 Modified <br />' • Benzene,toluene,ethylbenzene and total xylenes(BTEX)and the fuel additives di-Isopropyl <br /> ether(DIPE),ethyl tertiary-butyl ether(ETBE),methyl tertiary-butyl ether(MTBE),tertiary- <br /> amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dibromoethane (EDB) and <br />' 1,2-dichloroethane (1,2-DCA), methanol and ethanol in accordance with EPA Method <br /> 8260B <br /> 3.0. FINDINGS <br />' Ground water elevation, and flow direction were determined from field data Hydrocarbon-impact <br /> to ground water was quantified by laboratory 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 34 81 feet below the well heads <br /> during the April 2003 monitoring event The water level Is within the screened intervals of MW2 <br />' and MW3, but approximately 0 42 feet above the screened interval in MWI <br /> I <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 19 93 (MW2) to 20 04 feet <br /> (MW1)below mean sea level (MSL) Ground water data is summarized on Table 1 <br />' Ground water elevation contours based on the data for the April 2003 monitoring event are <br /> Illustrated on Figure 2 The ground water flow direction was south-southwest with a hydraulic <br />' gradient of 0 004 feet/feet <br />' 3 2 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH-g was detected in samples collected from MW1, MW2 and MW3 at concentrations of 57,000 <br />' micrograms per liter(µg11), 26,000 µg/1 and 61,000 pg/l, respectively <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />