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' 02 December 2002 . AGE-NC Project No 98-0433 ' Page 2 of 4 were then collected from each well using a disposable plastic bailer In addition, a water sample was ' collected from the domestic well(DW-1)on the site by allowing the well pump to operated for,one minute, then collecting a water sample from a dedicated sample tap ' The water from each monitoring well was transferred into three chilled 40-m1 volatile organic analysis (VOA) vials containing 0 5 ml hydrochloric acid (18%) as a sample preservative and one ' 1-liter amber bottle without preservative, water from the domestic well was poured directly into the sample containers from the dedicated sample tap ' After collection,the samples were labeled and placed in a chilled container for transportation under chain-of-custody to Cal Tech Environmental Laboratories, Inc (CTEL), a state of California Department of Health Services-certified analytical laboratory Each sample was analyzed for ' 0 Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in accordance with EPA Method 8015 Modified, ' 0 Benzene, toluene, ethyl benzene and total xylene (BTEX)in accordance with EPA Method 826013, lie The fuel additives methyl butyl ether (MTBE), tertiary butyl alcohol (TBA), di-isopropyl ether(DIPE),ethyl tertiary butyl ether(ETBE),tertiary amyl methyl ether(TAME),ethylene ' dibromide(EDB), 1,2-dichloroethane(1,2-DCA), ethanol and methanol in accordance with EPA Method 8260 Modified ' 3.0. FINDINGS ' Ground water elevations were determined by subtracting the measured depths-to-water from the surveyed casing elevations Ground water flow directions were determined by contouring the water elevations on a scaled site plan(Figure 3) The impact of the unauthorized release on ground water ' was quantified by laboratory analysis of samples collected during the quarter ' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION ' Depth to ground water at the site on 19 September 2002 ranged from 21 70 to 23 68 feet below well casing tops The ground water elevations at the site ranged from 33 79 feet (MW-6) to 35 37 feet (MW-4) above mean sea level (msl) The data indicates an average decrease of the ground water ' elevation in wells MW-1 through MW-5,MW-7 and MW-8 of 1 15 feet since the previous quarterly monitoring event The ground water elevation in well MW-6 decreased 2 86 feet since the previous monitoring event Depth to ground water and calculated elevation date are presented in Table 1 ' Advanced GeoEnvironmental,Inc I