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I03 December 2004 <br /> . AGE-NC Project No 95-0128 <br /> Page 2 of 4 <br /> I samples collected were logged on a chain of custody form, placed in a chilled container and <br /> transported to Cal Tech Environmental Laboratories (CTEL) a California Department of Health <br /> Services (DHS)-certified laboratory, for analysis The ground water samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) III <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(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 29 October 2004 ranged from 36 49 feet MW-10 to 39 37 feet <br /> p � g ( ) <br /> (MW-13)below the tops of the well casings The groundwater elevation calculated from the same <br /> data,ranged from 23 46 feet(MW-7)to 26 64 feet(MW-17)below mean sea level(MSL) The depth <br /> to ground water increased approximately 2 7 feet since the last sampling event The ground water <br /> table 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 1 The <br /> site ground water flow direction was inferred to be towards the east-northeast, with an apparent <br /> depression in the water table (MW-5), at the northeast corner of the site Ground water gradients <br /> range between 0 005 ft/ft north of the site to 0 024 f1/fl near the northeast corner of the site The <br /> ground water flow directions and gradients are depicted on Figure 3 <br /> IAdvanced GeoEnvironmental Inc <br /> I <br />