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29 November 2001 <br /> • AGE-NC Project No 96-0263 <br /> Page 2 of 4 <br /> I2 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 in a chilled <br /> container and transported under sham-of-custody to McCampbell Analytical Inc (MAI) a State of <br /> California Department of Health Services(DHS)-certified analytical laboratory The samples were <br /> analyzed for <br /> r + 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 602, and <br /> a Oxygenated compounds - di-isopropyl ether (DIPS), ethyl-tertiary butyl ether(ETBE), <br /> MTBE, tertiary-amyl methyl ether(TAME) and tertiary butanol (TBA) in accordance with <br /> EPA Method 8260-Modified <br />! ie <br /> I3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br />' 27 September 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 September 2001 sampling event,depths <br /> to ground water ranged from 6 90 feet to 8 02 feet below the tops of the well casings Ground water <br />' elevations at the site ranged from 28 89 feet above mean sea level (msl) in well MW9 to 29 73 feet <br /> above msl in well MW 1 <br />' 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 /> 1 <br /> 1 <br />