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I <br /> 24 August 2001 5 <br /> AGE-NC Project No 98-0432 ' <br />' Page 2 of 4 r <br /> i <br /> 1 contained on-site In appropriately labeled 55-gallon drums <br /> V 4 <br /> a <br /> 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Ground water samples were collected from the monitoring wells using disposable polyethylene <br /> ' bailers These bailers are disposed of after one use and require no decontaminating,minimizing cross <br /> contamination due to sampling devices Each water sample was transferred into three 40-m1 <br /> EPA-approved VOA vials contammg`0 5 ml 1 S% HCl as a sample preservative and into one 1-liter <br /> 1 amber bottle without preservative After collection, the samples were labeled and placed in a chilled <br /> container for transportation under chain-of-custody to McCampbell Analytical Labbratory(MAI) <br /> in Pacheco, California, a State of California Department of Health Services(DHS)Laboratory Each <br /> sample was analyzed for <br /> • Volatile aromatic compounds -benzene,toluene, ethylbenzene and total xylenes (BTEX) in ' <br /> ' accordance`with EPA Method 8020, y " <br /> • Total petroleum hydrocarbons quantified as diesel (TPH-d) in accordance with EPA Method <br /> 8015'Modified, <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> ' Method 8015 Modified, <br /> • Fuel additive compounds including di-isopropyl ether (DIPE), ethyl-tertiary-butyl ether <br /> (ETBE), methyl-tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), and <br /> ' tertiary-butanol (TBA), 1,2-dichloroethane (1,2-DCA), ethyl dibromide (EDB) and r <br /> 1,2-dlbromoethane in accordance with EPA Method 8260 Modified <br /> 3 0. FINDINGS <br /> ' Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 16 July 2001, the contaminant impact to ground water was quantified by the ground water sample <br /> ' laboratory analytical data <br /> ' 3 1 GROUND WATER ELEVATION,FLOW DIRECTION AND GRADIENT <br /> ' The depth to ground water measured in the water-table wells ranged from 15 87 to 16 48 feet below <br /> the top of the well casing (btoc) (Table 1) The ground water elevations at the site ranged from <br /> 2141 feet to 2164 feet above mean sea level in monitoring wells MW-4 and MW-5, respectively <br /> i <br /> 1 <br /> Advanced GeoEnvironmental,Inc <br />