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15 June 2005 <br /> • AGE-NC Project No 95-0128 <br />' Page 2 of 4 <br /> collected were logged on a chain of custody form, placed in a chilled container and transported to <br /> Cal Tech Environmental Laboratories(CTEL) a California Department of Health Services(DHS)- <br /> certified laboratory, for analysis The ground water samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in <br /> accordance with EPA Method 8015 Modified, <br /> • Benzene, toluene, ethylbenzene and xylene (BTEX) in accordance with EPA 8260B, and <br /> • Fuel additives di-isopropyl ether(DIPE),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 /> I <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 18 April 2005 ranged from 32 38 feet(MW-18)to 35 48 feet(MW-13) <br /> below the tops of the well casings The ground water elevation calculated from the same data,ranged <br /> from 20 90 feet(MW-7)to 23 02 feet(MW-16)below mean sea level(MSL) The depth to ground <br /> water increased approximately 2 6 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-I IB, 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 I The <br /> ground water flow direction continues to be toward the east-northeast,with an apparent depression <br /> in the water table (MW-5 and MW-6) at the northeast corner of the site Ground water gradients <br /> range between 0 006 ft/ft across the site and north of the site and the lowest gradient was at <br /> 0 002 ft/ft east of the site under the eastern margins of Pacific Avenue The ground water flow <br /> directions and gradients are depicted on Figure 3 <br /> i' <br /> Advanced GcoEnvironmental,Inc <br />