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I <br />' 15 August 2005 <br /> AGE-NC Project No 04-1045 <br />' Page 2 of 4 <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 and one 1-liter <br /> amber bottle without preservative The samples were labeled with the monitoring well designation, <br />' date,time of sampling, and the sampler's initials and transported in a chilled container under chain <br /> of custody to Cal Tech Environmental Laboratories (CTEL), a Department of Health Services- <br /> certified analytical laboratory, for analysis The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, <br /> • Benzene,toluene, ethylbenzene and total xylenes(BTEX)in accordance with EPA Method <br /> 8260, and <br /> • The fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl <br /> tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> 1,2-Dichloroethane (1,2-DCA) and 1,2-Dibromoethane (EDB) by EPA Method 8260 <br /> Modified <br /> • 3.4. FINDINGS <br /> I Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 05 May 2005 The contaminant impact to groundwater was quantified from the laboratory analytical <br /> data <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the May 2005 sampling event,depths to ground water ranged from 18 72 feet(MW-3) <br /> to 19 30(MW-2)feet below the tops of the well casings(Table 3),water levels were at least 3 7 feet <br /> below the top of the well screens, indicating that the wells are properly screened and representative <br /> of shallow ground water conditions The average calculated ground water elevation was <br /> approximately 9 28 feet below mean sea level (MSL) <br /> Ground water flow was inferred to be southeast at a hydraulic gradient of approximately 0 002 foot <br /> per foot (ft/ft) Figure 3 illustrates the contoured ground water elevations as measured on 05 May <br /> 2005 ' <br /> I <br /> • <br /> Advanced GeoEnvironmentai,Inc <br /> I <br />