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1 <br />' 18 March 2005 <br /> AGE-NC Project No 95-0128 <br />' Page 2 of 4 <br />' a California Department of Health Services (DHS)-certified laboratory, for analysis The ground <br /> water samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, <br /> • Benzene, toluene, ethylbenzene and xylene (BTEX) in accordance with EPA 8260B, and <br /> • Fuel additives di-isopropyl ether (DIPS), ethyl tertiary-butyl ether(ETBE),methyl tertiary- <br /> butyl ether(MTBE),tertiary-amyl methyl ether(TAME),tertiary butanol (TBA),methanol, <br /> ethanol, 1,2-dibromoethane (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with <br /> EPA Method 8260B <br /> 3.0. FINDINGS <br /> Ground water elevations were determined by subtracting the measured depths to ground water from <br /> the surveyed casing elevations Ground water flow directions were determined by contouring the <br /> water elevations on a scaled site plan Contaminant impact to ground water was assessed by <br /> laboratory analysis <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The depth to ground water on 17 January ranged from 35 28 feet(MW-18) to 38 14 feet (MW-13) <br /> below the tops of the well casings The groundwater elevation calculated from the same data,ranged <br /> from 23 41 feet(MW-7)to 25 19 feet(MW-17) below mean sea level (MSL) The depth to ground <br /> water decreased approximately 12 feet since the last sampling event The ground water table <br /> occurred within the screened interval of the shallow-screened monitoring wells, however, wells <br /> MW-1 to MW-3, MW-1113, MW-12B and MW-18 are deeper-screened wells and are currently <br /> drowned The depth to ground water and ground water elevation data is summarized in Table 1 The <br /> ground water flow direction continues to be toward the east-northeast, with an apparent depression <br /> in the water table(MW-5),at the northeast corner of the site Ground water gradients range between <br /> 0 0085 ft/ft across the site to 0 005 ft/ft north of the site and the lowest gradient was at 0 004 ft/ft <br /> east of the site, under Pacific Avenue The ground water flow directions and gradients are depicted <br /> on Figure 3 <br /> Advanced GeoEnnronmental Inc <br /> I <br />