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• 10 December 2004 <br /> ,AGE-NC Project No 02-0926 <br /> ' Page 2 of 4 <br /> r <br /> ' Temperature,pH, and conductivity of the purged water were measured at regular intervals using an <br /> Oakton water analyzer Field data logs are provided in Appendix C Purged water was containerized <br /> in properly labeled,75H 55-gallon Department of Transportation-approved drums and stored on-site <br /> 23 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> ' Water samples were collected from each monitoring well using dedicated tubing after allowing the <br /> wells to achieve a minimum 80% recovery of the pre-purge water volume The samples from each <br /> ' well were transferred into three 40-milliliter(ml) volatile organic analysis(VOA) vials containing <br /> 0 5 ml 18% hydrochloric acid solution as a sample preservative, one 1-liter amber bottle without <br /> preservative, and one 16-ounce plastic bottle The samples were labeled with the monitoring well <br /> ' designation,date,time of sampling,and the sampler's initials and transported in a chilled container <br /> under chain of custody to Cal Tech Environmental Laboratories (CTEL), a Department of Health <br /> Services-certified analytical laboratory for analysis The samples were analyzed for <br /> ' Totalp etroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA method 8015M, <br /> lie • 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) and <br /> ' fuel scavengers ethylene dibromide(EDB)and 1,2-dichloroethane(1,2-DCA)in accordance <br /> with EPA method 8260B, and <br /> • Total lead in accordance with EPA method 6010B <br /> ' 30. FINDINGS <br /> 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 43 08 feet below surface grade(bsg) Ground water elevation at the site ranged from <br /> Advanced GeoEnvn•onmental,Inc <br /> 1 <br />