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Ile <br /> 14 December 2005 <br /> AGE-NC Project No 95-0167 <br /> E <br /> �P Page 2 of 4 <br /> 1 <br /> `3 sample was collected from each purged well using the dedicated disposable plastic bailers Each <br /> water sample was transferred into three 40-milliliter (ml) volatile organic analysis (VOA) vials <br /> containing 0 5 ml 18% hydrochloric acid solution as a sample preservative After collection, the <br /> c samples were properly labeled,placed in a chilled container,and transported under chain of custody <br /> to Cal Tech Environmental Laboratories (CTEL), a California Department of Health Services <br /> (DHS)-certified analytical laboratory in Paramount, California The samples were analyzed for <br /> F <br /> „ 0 TotaI petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, and <br /> 10 Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and the fuel additives methyl <br /> r tertiary-butyl ether MTBE, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> tertiary-amyl methyl ether(TAME),tertiary-butyl alcohol(TBA), 1,2-dibromoethane(EDB), <br /> and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B <br /> C ' <br /> ' 3.0. FINDINGS <br /> ` i <br /> Ce Groundwater flow direction,elevation,and gradient were determined from data collected in the field' si during the September2005 quarterly monitoring event The hydrocarbon g <br /> impact to round water was <br /> P <br /> quantified by laboratory data obtained from ground water samples <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> ' On 12 September 2005, depths to ground water ranged from 14 54 feet (MW-7) to 15 78 feet <br /> (MW-6) below the tops of the well casings Ground water elevations at the site averaged <br /> approximately 3 92 feet below mean sea level (MSL), indicating an average elevation decrease of <br /> ' 0 84 feet since the last monitoring event in June 2005 (Table 1) During this monitoring event, <br /> ground water was within the screened interval of each well,thus producing an accurate sampling of <br /> the first encountered ground water <br /> The ground water flow direction was determined by plotting and contouring the ground water <br /> ' elevation data At the time of the September 2005 monitoring event,the ground water flow direction <br /> was inferred to be to the east-northeast under an approximate hydraulic gradient ranging betwen <br /> 0 003 ft/ft in the western portion of the site and 0 013 ft/ft in the eastern portion Figure 3 illustrates <br /> - the contoured ground water elevations as measured on 12 September 2005 <br /> K t <br /> Advanced GeoEnvironmental,Inc <br />