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ti 13 June 2005 , AGE-NC Project No 02-0962 IPage 2 of 4 dedicated tubing after allowing the well to achieve a minimum 80%recovery of the pre-purge water volume The samples from each well were transferred Into three 40-milliliter(ml) volatile organic analysis(VOA)vials containing 0 5 ml 18%hydrochloric acid solution as a sample preservative,and into one 1-liter amber bottle without preservative The samples were labeled with the monitoring well designation, date, time of sampling, and the sampler's initials and transported in a chilled container under chain of custody to Cal Tech Environmental Laboratories (CTEL), a State of , I California Department of Health Services (DHS)-certified analytical laboratory, for analysis The samples were analyzed for r • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, respectively) in accordance with EPA Method 8015M, and • Benzene,toluene,ethylbenzene,and total xylenes(BTEX)and fuel additives methyl tertiary- butyl ether(MTBE), tertiary-butyl alcohol(TBA),di-Isopropyl ether(DIPE),ethyl tertiary- butyl ether(ETBE),tertiary-amyl methyl ether(TAME), 1,2-dibromoethane(EDB),and 1,2- Idichloroethane (1,2-DCA) in accordance with EPA Method 8260B 3.0. FII - DIINGS Ground water elevation and flow direction were inferred from field data, hydrocarbon impact to ground water was quantified by laboratory analysis of the ground water samples 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION The elevation of ground water in each of the monitoring wells was calculated by subtracting the depths,to ground water from the surveyed relative casing elevations (Table 1) Depths to ground water ranged from 19 55 feet (MW-1) to 19 80 feet (MW-2) below the tops of the well casings Ground water elevation at the site averaged approximately 7 73 feet below mean sea level (MSL), indicating an increase in ground water elevation of 2 20 feet since the last ground water monitoring event in November 2004 During the March 2005 ground water monitoring event, ground water was Inferred to be flowing toward the north-northwest under a nearly flat gradient of approximately 0 0003 foot/foot (ft/ft) Ground water elevations were within the screened intervals of the wells,indicating that the wells are properly screened to yield samples representative of shallow ground water conditions `Figure 3 illustrates the contoured ground water elevation as measured on 02 March 2005 I Advanced GeoEnvnronmentat,Inc I ,