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22 October 2002 • AGE-NC Project 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) and methyl tertiary-butyl ether ' (MTBE) in accordance with EPA Method 8260B • The oxygenated compounds di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), ' MTBE, tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), methanol and ethanol in accordance with EPA Method 8260B • Ethylene dibromide (EDB) and 1,2 dichloroethane (1,2 DCA) in accordance with EPA Method 8260B 3.0. FINDINGS '. Ground water elevation, and flow direction were determined from field data, hydrocarbon-impact to ground water was assessed 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 33 94 feet below the well heads during the July 2002 monitoring event The water level is within the screened intervals of MW2 and ' MW3, but approximately 1 3 feet above the screened interval in MW 1 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 19 05 (MW-2) to 19 16 feet (MW-3)below mean sea level (MSL) Ground water data is summarized on Table 1 Ground water elevation contours based on the data for the July 2002 monitoring event are illustrated on Figure 2 The ground water flow direction was south-southeast with a gradient of 0 005 ft/ft 32 ANALYTICAL RESULTS OF WATER SAMPLES ' TPH-g was detected in samples collected from MW1, MW2 and MW3 at concentrations of 61,000 micrograms per liter (µg/1), 45,000 µg/1 and 100,000 µg/l, respectively Advanced Geo Environmental,Inc