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14 January 2005 <br /> • AGE-NC Project No 00-0769 <br /> Page 2 of 7 <br /> Temperature, pH, and conductivity were measured at regular purge-volume intervals in each well <br /> using an Oakton water analyzer Field logs are provided in Appendix B Purged water was <br /> temporanly stored on-site in properly labeled, Department of Transportation (DOT)-approved <br /> r 55-gallon drums <br /> 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Ground water samples were collected from wells MW-2B and MW-3B utilizing new, 2-inch <br /> diameter disposable polyethylene bailers Samples were collected from wells MW-1, MW-2A, <br /> MW-3B, and MW-4A through MW-9D utilizing a Waterra Inertia pump and %-inch diameter <br /> polyethylene tubing The samples were 'transferred Into three, 40-milliliter (ml) EPA-approved <br /> volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid solution as a <br /> preservative Care was taken to ensure that visible air bubbles were not present in the vials after <br /> filling and capping The sample vials were labeled with the monitoring well designation, date,time <br /> of sampling, and the sampler's initials Following collection, samples were placed in a chilled <br /> container and transported under chain of custody to Cal Tech Environmental Laboratories(CTEL), <br /> . a California Department of Health Services (DHS)-certified analytical laboratory, for analysis <br /> Samples were analyzed for the following constituents <br /> 0 Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, and <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and the fuel additives methyl <br /> tertiary-butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> tertiary-amyl methyl ether(TAME),tertiary-butyl alcohol(TBA), 1,2-dibromoethane(EDB), <br /> 1,2-dichloroethane (1,2-DCA), ethanol, and methanol in accordance with EPA <br />' Method 8260B ` <br />' 3.0. FINDINGS <br /> Ground water elevation,flow direction,and gradient were inferred from field data The hydrocarbon <br /> impact to ground water was quantified by laboratory analysis of ground water samples <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> On 24 through 26 May 2004,depth to ground water was between 25 45 feet(MW-8A)and 30 08 feet <br /> • (MW-5E) below the tops of the well casings Ground water elevations ranged from 15 85 feet <br /> Advanced GeoE nviron mental,Inc <br />