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18 November 2004 <br /> . AGE-NC Project No 97-0351 <br /> Page 2of4 <br /> ' EPA-approved volatile organic analysis(VOA)vials containing 0 5 ml hydrochloric acid (18%) as <br /> a sample preservative The samples were properly labeled, placed in a chilled container and <br /> transported under chain of custody to Cal Tech Environmental Laboratories (CTEL), a California <br /> ' Department of Health Services-certified laboratory Each sample was analyzed in accordance with <br /> • EPA Method 8015-modified for total petroleum hydrocarbons quantified as gasoline <br /> (TPH-g), <br /> • EPA Method 8260B for benzene, toluene, ethylbenzene and total xylenes (BTEX) and <br /> ' methyl tertiary butyl ether (MTBE), and <br /> • EPA Method 8260B for the fuel additives di-isopropyl ether(DIPE),ethyl tertiary butyl ether <br /> (ETBE), MTBE, tertiary amyl methyl ether (TAME), tertiary butyl alcohol (TBA), 1,2- <br /> ' dichloroethane (1,2-DCA) and ethylene dibromide (EDB) <br /> 30 FINDINGS <br />' '• Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 22 April 2004 The contaminant impact to ground water was quantified from the ground water <br /> laboratory data <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> ' The relative elevation of ground water in each well was calculated by subtracting the ground water <br /> depth from the relative casing elevation The wells were surveyed relative to the top of well MW-1, <br /> ' which was assigned an arbitrary elevation of 10 feet <br /> Depths to ground water ranged between 8 14 and 9 49 feet below the top of the casings Relative <br /> ground water elevations at the site ranged between 0 99 (MW-3)to 1 22 feet(MW-2) The relative <br /> ground water elevation data is summarized in Table 1 <br /> ' Ground water flow direction in the area of the western UST was inferred to be toward the northeast <br /> at a gradient of approximately 0 002 foot/foot (ft/ft) Ground water contours are depicted on <br /> Figure 3 <br /> ' Advanced GeoEnvironmental,Inc <br /> 1 <br />