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1 <br /> 08 April 2005 <br /> AGE-NC Project No 95-0173 <br />' Page 3 of 10 <br />' 23 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 /> E (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), dr-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 /> E <br /> 2 4 QUARTERLY GROUND WATER MONITORING AND SAMPLING FINDINGS <br /> EAGE determined round water flow direction and gradient from g g the field data collected on 30 <br /> November 2004, the contaminant impact to ground water was assessed from the laboratory data <br /> 10 collected on 30 November 2004 <br /> E2 4 1 Ground Water Elevation and Gradient <br /> During the November 2004 ground water monitoring event, the depths to ground water ranged <br /> between 31 56 feet (MW-8) and 34 38 feet (MW-6) below the tops of the well casings (Table 2), <br /> ground water elevations were calculated to be between 22 94 feet (MW-8) and 24 61 feet (MW-5) <br /> below mean sea level Figure 3 Illustrates the ground water elevations plotted and contoured on a <br /> scaled site map Generally, ground water flow direction was inferred to be east-northeast at an <br /> approximate hydraulic gradient of 0 004 ft/ft or less (Figure 3),typically, ground water elevation at <br /> the site increased an average 0 80 feet between the third and fourth quarter 2004 ground water <br /> monitoring events <br /> GeoTracker confirmation pages of the submitted ground water monitoring electronic deliverable <br /> format (EDF) files are included in Appendix B <br /> 2 4 2 Laboratory Results of Ground Water Samples 30 November 2004 <br /> A total of eighteen ground water samples were submitted to CAL for analysis TPH-g was detected <br /> . in ground water samples MW-1, MW-2 and MW-4 at concentrations as high as 2,600 micrograms <br /> Advanced GeoEnvironmental,Inc <br /> i <br />