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lie 01 May 2003 AGE-NC Project No 99-0657 iPage 2 of 4 i to Cal Tech Environmental Laboratories (CTEL), a California Department of Health Services- certified analytical laboratory, for analysis The samples were analyzed for i • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in accordance with EPA Method 8015 Modified, i0 Benzene, toluene, ethylbenzene and total xylenes (BTEX) in accordance with EPA Method 8021, and • Fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl i tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butyl alcohol (TBA), 1,2-dichloroethane (1,2-DCA) and 1,2-dibromoethane (EDB) in accordance with EPA Method 8260B i i3.0. FINDINGS Ground water elevation, flow direction, and gradient were determined from field data collected on Ile 06 January 2003 The conta -nnant Impact to ground water was quantified from the laboratory analytical data i3 1 GROUND WATER GRADIENT AND FLOW DIRECTION iAt the time of the January 2003 sampling event, depths to ground water ranged from 34 31 feet to 36 28 feet below the tops of the well casings Ground water elevations at the site ranged from 5 87 feet above mean sea level(MSL)in well MW6 to 6 27 feet above MSL in well MW7 (Table 1) During this monitoring event, the ground water levels in the wells were at least four feet below the tops of the well screens,indicating that the wells are screened properly to yield representative shallow i ground water samples The ground water elevation at the site remained fairly stable with a nominal average decrease of 0 11 feet between the October 2002 and January 2003 monitoring events i Ground water flow was inferred to be flowing towards the southwest with an average hydraulic gradient of 0 003 feet/feet Figure 3 illustrates the contoured ground water elevations as measured on 06 January 2003 i 10 iAdvanced GeoEnvironmental Inc I I