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I . 20.Juno•2001 <br /> AGE-NC Project No. 98-0440 <br /> I. Page 2'.6f 6 <br /> 2.2. COLLECTION OF GROUND WATER SAMPLES <br /> Water samples .were collected from each purged•well using new disposable plastic' bailers. <br /> Additionally,.a water sample was collected from domestic well DW51'57"after the well purge.valve <br />'! was opened and.water was allowed to run for more'than 15 minutes, allowing the pump to turn on. <br /> Each water sample was transferred into one 1-liter amber bottle without sample preservative and into <br /> three 40-m1 VOA vials containing 0.5 ml 1 S% hydrochloric acid as a'sampie,preservative. After <br /> collection, the samples were properly labeled, placed in a chilled container,and"transported under <br /> chain-of-custody to McCampbell Analytical,Inc. (MAI), a California Department of Health Services <br />' (DHS)-certified analytical laboratory in Pacheco, California. Each sample was analyzed for:• <br /> •, Total peiroleurn- hydrocarbons quantified 'as gasoline and diesel (TPH-g •and'!TPH-d; :n <br /> respectively)by EPA Methods 8015M/5030/3550; <br /> " Volatile aromatic compounds - benzene;,toluene, ethyl benzene and xylene (BTEX).with <br />' methyl-tertiary butyl ether (MTBE) by EPA Method 8020." " <br />' 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on ; <br /> 15 March 2001; the contaminant impact to ground water was quantified by the laboratory analytical <br /> data. <br /> 3.1. GROUND WATER.GRADIENT AND FLOW DIRECTION ; <br /> .The elevation of ground water-in each well was calculated by subtracting the depth to ground water ; <br /> from the surveyed well casingelevations (Table 1). {' <br /> I <br /> Depths to �ound-water ran erfrom 13.31 feet to 119'5 be'low'the well casing tops. Ground, ' <br /> - . <br /> water elevations at the-site ranged from 26.39 feet,above mean sea level (MSL) in well MW3 to <br />' <br /> '27.15 feet above MSL in well MW 1, " <br /> j <br /> The ground water-flow direction was inferred using ground'water elevation data:The ground water <br /> at the site on 1.5 March 2001 was`inferred to have been'flowing,to the'north-northwest with an <br /> average hydraulic gradient of 0.007 feet/feet.Figure 4 illustrates the ground water elevation^contours. , <br /> Advanced Gen Environmental,Inc. <br />