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s ' ' 18 September 2003 AGE-NC Project No 95-0111 ' Page 2 of 4 ' The samples were labeled and placed in a chilled container for transportation under chain-of-custody to McCampbell Analytical,Inc (MAI),a California Department ofHealth Semces(DHS)-certified analytical laboratories Each sample was analyzed for ' • Total petroleum hydrocarbons quantified as gasoline and diesel(TPH-g and TPH-d)byEPA Method 8015 Modified, • Benzene, toluene, ethylbenzene and total xylenes (BTEX) by EPA Methos 8021B/8015, • Fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether(ETBE),methyl tertiary- butyl ether(MTBE), tertiary-amyl methyl ether (TAME), and tertiary-butyl alcohol(TBA) by EPA Method 8260B ' 3.0. FINDINGS ' Ground water elevation, flow direction, and gradient were deterrnmed from field data collected on 28 June 2003,the contaminant impact to ground water was quantified from the laboratory analytical �. data 3 1 GROUND WATER FLOW DIRECTION AND GRADIENT The elevation of ground water in each well was calculated by subtracting the depth to ground water from the surveyed well casing elevations (Table 1) The depth to ground water ranged from 6 85 feet to 10 03 feet below the tops of the well casings in I wells MW-1 through MW-8 Ground water elevations at the site ranged from 9 20 feet above mean sea level(MSL)in well MW-6 to 10 44 feet above MSL in well MW-3 Ground water elevations in wells MW 1 and MW-3 through MW-8 decreased an average of 0 19 feet between the March 2003 and the June 2003 sampling events The ground water elevation in wells MW-2 increased approximately 166 feet since the previous monitoring event Well MW-3 was"drowned",the water level was approximately 0 89 feet above the screened interval The ground water flow direction was inferred to be towards the north-northwest under a gradient of approximately 0 008 feet/feet Figure 3 illustrates the contoured ground water elevations 6543,m Advanced GeoEnvironmental Inc I