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' 12 August 2002 <br /> AGE-NC Project No 97-0351 <br /> Page 2 of 4 <br /> ' upon retrieval, samples were transferred into chilled 40-m1 EPA-approved volatile organic analysis <br /> (VOA) vials containing 0 5 ml hydrochloric acid(18%) as a sample preservative The samples were <br /> properly labeled, placed in a chilled container and transported under chain-of-custody to Cal Tech <br /> Environmental Laboratories(CTEL),a California Department of Health Services-certified analytical <br /> laboratory located In Paramount, California 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 8020 for benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl <br /> tertiary-butyl ether(MTBE), and <br /> t • EPA Method 8260 Modified for di-isopropyl ether(DIPE),ethyl tertiary butyl ether(ETBE), <br /> methyl tertiary butyl ether (MTBE), tertiary amyl methyl ether (TAME) and tertiary butyl <br /> alcohol (TBA), 1,2-dichloroethane (1,2-DCA), ethylene dibromide (EDB), ethanol and <br /> methanol <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 07 June 2002, the contanunant impact to ground water was quantified from the ground water <br /> laboratory data <br /> I3 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 81 feet below surface grade(bsg) Relative <br /> ground water elevations at the site ranged between 0 73 feet (MW-3) 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 aiea of the western UST was toward the at a <br /> gradient of approximately 0 0019 (ft/ft) as depicted in Figure 3 The close pi oximity of the western <br /> UST area to the Stockton Deep Water channel may have a significant effect on the local flow <br /> • do ection and gradient <br /> 1 <br /> ' Advanced GeoEnvxronenental,Inc <br />