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r I 29 January 2004 . AGE-NC Project No 96-0263 rPage 2 of 4 After collection, the samples were properly labeled, placed in a chilled container and transported r under chain-of-custody to Cal Tech Environmental Laboratories (CTEL), a State of California Department of Health Services (DHS)-certified analytical laboratory The samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 5030/8015 Modified, rBenzene,toluene, ethylbenzene and total xylenes(BTEX) in accordance with EPA Method 8260B, and rFuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), 1,2-di chloro ethane (1,2-DCA) and 1,2-dibromo ethane (EDB) in accordance with EPA rMethod 8260B r3.0. FINDINGS ' Ground water elevation, flow direction, and gradient were determined from field data collected on 13 December 2003, the contaminant impact to ground water was quantified from the laboratory analytical data r 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION rThe elevation ofground water in each well was calculated by subtracting the depth to ground water r from the surveyed well casing elevations (Table 1) For the December 2003 sampling event, depths to ground water ranged from 7 08 feet to 8 25 feet below the tops of the well casings Ground water elevations at the site ranged from 28 65 feet above mean sea level(MSL)in well MW9 to 29 48 feet ' above MSL in well MWI 1 The ground water flow direction was determined by contouring the ground water elevation data The ' ground water at the site was inferred to be flowing to the northwest at an average gradient of 0 005 feet/feet The ground water contours are depicted on Figure 3 Elevation data from deep- screened well MW6(well-screened interval between 27 and 32 feet bsg)was not used to determine rground water flow direction r rAdvanced GeoE nviron mental,Inc r