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' 13 March 2003 <br /> AGE-NC Project No 97-0351 <br /> tPage 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(TPH-g) <br /> ' and, <br /> • EPA Method 8260B-modified for benzene,toluene,ethylbenzene and total xylenes(BTEX) <br /> ' and the fuel additives di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), methyl <br /> tertiary butyl ether (MTBE), tertiary amyl methyl ether (TAME) and tertiary butyl alcohol <br /> (TBA), 1,2-dichloroethane (1,2-DCA) and ethylene dibromide (EDB) <br /> ' 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> ' • 23 September 2002 The contaminant impact to ground water was quantified from the ground water <br /> laboratory data <br /> ' <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 22 and 9 50 feet below the top of the casings Relative <br /> ' ground water elevations at the site ranged between 108 (MW-5) to 1 14 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 0 001 (ft/ft) Ground water contours are depicted in Figure 3 <br /> ' 3 2 ANALYTICAL RESULTS OF WATER SAMPLES <br /> ' The results of laboratory analysis of ground water samples collected at the site on 31 January 2003 <br /> . are as follows <br /> ' Advanced GeoEnvironmental,Inc <br />