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01 September 2005 <br /> AGE-NC Project No 95-0173 <br />' Page 3 of 10 <br /> k <br />' and air sparge wells AW-1B and AW-211 and poured directly into the 40-m1 VOA vials utilizing the <br /> Waterra hose bailer Care was taken to ensure that visible air bubbles were not present in the vials <br /> after filling and capping Ground water sample containers were labeled with the well designation, <br />' date,time, and sampler's initials <br />' 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> After labeling,each ground water sample was logged on a chain of custody form,placed in a chilled <br /> container,and transported to Castle Analytical Laboratory(CAL),a California Department of Health <br /> Services (DHS)-certified laboratory, to be analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015M, <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX), methyl tertiary-butyl ether <br /> (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), di-isopropyl ether <br /> (DIPE), ethyl tertiary-butyl ether (ETBE), 1,2-dichloroethane (1,2-DCA), and ethylene <br /> dibromide (EDB) by EPA Method 8260B <br />�i <br /> 2 4 QUARTERLY GROUND WATER MONITORING AND SAMPLING FINDINGS <br /> AGE determined ground water flow direction and gradient from the field data collected on 16 May <br />' 2005, the contaminant impact to ground water was assessed from the laboratory data collected on <br /> 16 May 2005 <br /> 2 4 1 Ground Water Elevation and Gradient <br />' During the May 2005 ground water monitoring event, the depths to ground water ranged between <br /> 27 21 feet (MW-8) and 29 79 feet (MW-6) below the tops of the well casings (Table 2), ground <br /> water elevations were calculated to be between 18 59 feet (MW-8) and 19 67 feet (MW-5) below <br /> mean sea level Figure 3 illustrates the ground water elevations plotted and contoured on a scaled <br /> site map Generally,ground water flow direction was inferred to be east-northeast at an approximate <br /> hydraulic gradient of 0 003 ft/ft or less (Figure 3), typically, ground water elevation at the site <br /> increased an average 4 67 feet between the November 2004 and May 2005 ground water monitoring <br /> events <br /> GeoTracker confirmation pages of the submitted ground water monitoring electronic deliverable <br /> . format (EDF) files are included in Appendix B <br />' Advanced CeoEnvrronmeutal,Inc <br /> 1 <br />