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11 February 2005 <br /> ' a f <br /> • AGE-NC Project No '02-0962 <br /> r <br /> r Page 2 of 4 <br /> , <br /> V I <br /> Temperature,pH,and conductivity of the purged water were measured at regular Intervals using an <br /> rOakton water analyzer Field data logs are provided in Appendix C Purged water was containerized <br /> in properly labeled,Department of Transportation(DOT)-approved 55-gallon drums and stored on- <br /> >a site pending-proper disposal <br /> r ; <br /> 2 3 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each monitoring well using a Waterra inertia pump and dedicated <br /> r tubing after allowing the well to achieve a minimum 80%recovery of the pre-purge water volume <br /> The samples from each well were transferred into three,40-milliliter(ml) volatile organic analysis <br /> (VOA) vials containing 0 5 ml 18% hydrochloric acid solution,as a sample preservative, and one, <br />' 1-liter amber bottle without preservative 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 State of California <br />' Department of Health Services(DHS)-certified analytical laboratory,for analysis The samples were <br /> analyzed for <br /> • Total' petroleum hydrocarbons 'quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively) in accordance with EPA Method 8015M, and <br /> Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and fuel oxygenates methyl <br /> I tertiary-butyl ether(MTBE), tertiary-butyl alcohol(TBA), di-isopropyl ether (DIPE), ethyl <br /> tertiary-butyl ether(ETBE),tertiary-amyl methyl ether(TAME),ethylene dibromide(EDB), <br />' and 1,2-dichloroethane {1,2-DCA} in accordance with EPA Method 8260B <br /> I <br /> f i , <br />' 3.0. ', 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 /> 1 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 approximately,21 86 feet below surface grade (bsg) Ground water elevations at the site <br /> ranged from 9 88 feet(MW-2)to 9 99 feet(MW-3)below mean sea level(MSL),indicating a nearly <br /> r flat gradient of approxiniately 0 001 foot/foot(ft/ft),with ground water flowing toward the northeast <br /> ' P r <br /> 1 Advanced GeoEnvironmental,Inc <br /> If <br /> a i <br />