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i 29 October 2003 AGE-NC Project No 97-0326 Page 2 of 4 Environmental Laboratories (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 8015M, and • Benzene,toluene,ethylbenzene and total xylenes(BTEX)and the fuel additives di-isopropyl ether(RIPE),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 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 39 feet below the well heads during the July 2003 monitoring event The water level is within the screened intervals of MW-2 and MW-3, but approximately 0 07 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 20 53 feet(MW-1)to 20 59 feet (MW-2) below mean sea level (MSL) However, the depth to ground water (35 11 feet) at well MW-1 was affected by the presence offree product,the depth was recalculated(35 07 feet)utilizing the measured thickness of free product in well MW-1 DW= Corrected depth to water Dm=Measured depth to water tg=Total thickness of free product (-0 05 foot) dg=Density of free product (diesel at—0 88 g/ml) d,=Density of water (-1 0 gm/nil) Ground water data is summarized on Table 1 Advanced GeoEnvironmentai,Inc