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I • i I04 October 2000 • AGE-NC Project No 97-0326 Page 2 of 4 placed in a chilled container and transported under chain-of-custody to Alpha Analytical Laboratories, Inc (Alpha Analytical), a State of California Department of Health Services (DHS)- certified analytical laboratory Each sample was analyzed for I • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA method GCFID 5030 I • Volatile aromatic hydrocarbons -benzene,toluene, ethylbenzene and total xylenes(BTEX) with methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 8020 I • Oxygenated compounds - di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, tertiary-amyl methyl ether(TAME) and tertiary butanol (TBA) in accordance with I EPA Method 8260B • Ethylene Dibromide (EDB) and 1,2 Dichloroethane (1,2 DCA) in accordance with EPA Method 8260 I lie3.0. FINDINGS From the field data,AGE was able to infer the ground water flow direction and gradient Laboratory I analysis of three ground water samples detected petroleum hydrocarbons and volatile aromatic hydrocarbons in all three samples, oxygenated fuel additives were found in two of the samples (MW 1 and MW3) 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION Ground water was measured at a depth of approximately 32 feet below the tops of the well heads during the September 2000 monitoring event,within the screened interval of MW2 and MW3,but approximately 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 16 76 to 16 89 feet below mean sea level (MSL) Ground water data Iis summarized on Table 1 Ground water elevation contours based on the data for the September 2000 monitoring event are illustrated on Figure 3 The ground water flow direction was very nearly due south with a gradient of 0 0065 ft/ft Advanced GeoEnvironmental,Inc I