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' 08 November 2002 <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 ofHealth Services-certified analytical laboratory located in Paramount,California Each <br /> sample was analyzed in accordance with <br /> • EPA Method 8015 Modified for total petroleum hydrocarbons quantified as gasoline <br /> (TPH-g) and <br /> ' • EPA Method 8260 Modified for benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> and the fuel additives dl-Isopropyl ether(DIPE), ethyl tertiary butyl ether(ETBE), methyl <br /> tertiary butyl ether (MTBE), tertiary amyl methyl ether (TAME) and tertiary butyl alcohol <br /> 1 (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 /> lie 23 September 2002, 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 38 feet and 9 87 feet below the top of the casings Relative <br /> ground water elevations at the site ranged between 0 51 feet (MW-5) to 0 98 feet (MW-2) The <br /> relative 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 north-northeast at a <br /> gradient of approximately 0 0019 (ft/f1), as 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 23 September <br /> 2002 are as follows <br /> Advanced GeoEnvironmental,Inc <br />