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1 <br /> ' 10 March 2005 <br /> • AGE-NC Project No 97-0351 <br /> Page 2 of 4 <br /> ' after allowing the well to achieve a minimum 80% recovery of the pre-purge water volume The <br /> samples from each well were transferred into three 40-milliliter(ml)volatile organic analysis(VOA) <br /> vials containing 0 5 ml 18%hydrochloric acid solution as a sample preservative The samples were <br /> ' labeled with the monitoring well designation, date,time of sampling, and the sampler's initials and <br /> transported in a chilled container under chain of custody to Cal Tech Environmental Laboratories <br /> (CTEL), a Department of Health Services (DHS)-certified analytical laboratory for analysis The <br /> ' samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> method 8015M, <br /> • Volatile aromatic compounds benzene,toluene, ethylbenzene, and total xylenes(BTEX) in <br /> ' accordance with EPA method 826013, <br /> • Fuel oxygenates tertiary butanol(TBA),di-isopropyl ether(DIPE),ethyl tertiary-butyl ether <br /> (ETBE), tertiary-amyl methyl ether (TAME), and methyl tertiary-butyl ether (MTBE) in <br /> accordance with EPA method 826013, and <br /> • Lead scavengers ethylene dlbromide(EDB)and 1,2-dichloroethane(1,2-DCA)in accordance <br /> with EPA method 8260B <br /> 3.0. FINDINGS <br /> t' Ground water elevation and flow direction were inferred from field data, hydrocarbon impact to <br /> ground water was quantified by laboratory analysis of the ground water samples <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> ' The elevation of ground water in each of the monitoring wells was calculated by subtracting the <br /> depth to ground water from the surveyed relative casing elevations(Table 1) Depths to ground water <br /> averaged about 9 06 feet below surface grade (bsg), during this monitoring event, ground water <br /> levels were within the screened intervals of the wells Ground water elevations at the site ranged <br /> from 0 14 feet (MW-1) to 1 19 feet (MW-5) above mean sea level (MSL) The ground water flow <br /> direction was towards both the north and west in the area of MW-1 with a calculated gradient of <br /> ' approximately 0 016 foot per foot (ft/ft) and 0 027 ft/ft Figure 3 illustrates the contoured ground <br /> water elevations as measured on 22 October 2004 <br /> • <br /> Advanced GeoEnvironmentsl,Inc <br /> 1 <br />