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1 <br /> 1 31 July 2003 <br /> • AGE-NC Project No 97-0351 <br /> ' Page 2 of 4 <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 located in Paramount, California Each sample <br /> was analyzed in accordance with <br /> ' • EPA Method 8015-modified for total petroleum hydrocarbons quantified as gasoline <br /> (TPH-g), <br /> EPA Method 8021 for benzene, toluene, ethylbenzene and total xylenes (BTEX), methyl <br /> ' tertiary butyl ether (MTBE) and <br /> EPA Method 8260B-modified for the fuel additives di-isopropyl ether(DIPE),ethyl tertiary <br /> ' butyl ether(ETBE),methyl tertiary butyl ether(MTBE),tertiary amyl methyl ether(TAME) <br /> and tertiary butyl alcohol (TBA), 1,2-dichloroethane (1,2-DCA) and ethylene dibromide <br /> ' (EDB) <br /> 3.0. FINDINGS <br /> 1 <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 21 May 2003 The contaminant impact to ground water was quantified from the ground water <br /> laboratory data <br /> ' <br /> 31 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 12 and 9 41 feet below the top of the casings Relative <br /> ground water elevations at the site ranged between 0 94(MW-3)to 1 24 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 to the northeast at a <br /> gradient of approximately 0 003 (ft/ft) Ground water contours are depicted in Figure 3 <br /> 1 <br /> Advanced GeoEnironmental,Inc <br />