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I15 February 2002 <br /> . AGE-NC Project No 96-0263 <br /> IPage 2 of 4 <br />' 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new disposable plastic bailers Each <br />' water sample was transferred into three 40-m1 VOA vials containing 0 5 ml 18%hydrochloric acid <br /> as a sample preservative After collection, the samples were properly labeled, placed to a chilled <br /> container and transported under chain-of-custody to Cal Tech Analytical Laboratories (CTEL) a <br />' State of California Department ofHealth Services(DHS)-certified analytical laboratory The samples <br /> were analyzed for <br />' Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 5030/8015 Modified, <br />' Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl-tertiary butyl ether <br /> (MTBE) in accordance with EPA Method 8 02 1, and <br /> • Oxygenated compounds - di-isopropyl ether (DIPE), ethyl-tertiary butyl ether(ETBE), <br />' MTBE, tertiary-amyl methyl ether(TAME) and tertiary butanol (TBA) in accordance with <br /> EPA Method 8260B <br /> fi <br /> 3.0. FINDINGS <br /> IGround water elevation, flow direction, and gradient were determined from field data collected on <br /> 20 December 2001, the contaminant impact to ground water was assessed from the laboratory <br /> analytical 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 casing elevations (Table 1) For the December 2001 sampling event,depths <br /> to ground water ranged from 6 93 feet to 7 88 feet below the tops of the well casings Ground water <br />' elevations at the site ranged from 28 91 feet above mean sea level(msl)in well MW5 to 29 85 feet <br /> above msl in wells MW 1 and MW 11 <br /> I The ground water flow direction was determined by contouring the ground water elevation data The <br /> ground water at the site was inferred to be flowing to the north-northwest at an average gradient of <br /> 0 005 feet/feet or 26 feet per mile The ground water contours are depicted on Figure 3 <br />