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L' <br /> 30 October 2002 <br /> AGE-NC Project No. 98-0440 <br /> Page 2 of 4 <br /> 2.2. COLLECTION OF GROUND WATER SAMPLES <br /> A water sample was collected from each purged well using a new disposable plastic bailer and <br /> transferred into one 1-liter amber bottle without sample preservative and into three 40-m1 VOA vials <br /> containing 0.5 ml 18%hydrochloric acid as a sample preservative.After collection,the samples were <br /> properly labeled, placed in a chilled container and transported under chain-of-custody to <br /> McCampbell Analytical Inc.(MAI)a California Department ofHealth Services-certified laboratory. <br /> Each sample was analyzed for: <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively) by EPA Methods 8015M/5030/3550; and <br /> • Benzene,toluene,ethyl benzene and xylene(BTEX)and methyl-tertiary butyl ether (MTBE) <br /> by EPA Method 8 02 1. <br /> 3.0. FINDINGS <br /> . Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 25 September 2002; the contaminant impact to ground water was quantified by the laboratory <br /> analytical data. <br /> 3.1. GROUND WATER GRADIENT AND FLOW DIRECTION <br /> Depths to ground water ranged from 11.27 feet to 11.91 feet below the well casing tops. Ground <br /> water elevations at the site ranged from 28.39 feet above mean sea level (MSL) in well MW3 to <br /> 29.19 feet above MSL in well MW1. Ground water elevations at the site decreased an average of <br /> 0.30 feet between the June 2002 and September 2002 sampling events. Ground water levels were <br /> within the screened intervals of all the monitoring wells on-site. <br /> The ground water flow direction was inferred using ground water elevation data. The ground water <br /> at the site on 25 September 2002 was inferred to have been flowing to the north-northwest under an <br /> average gradient of 0.009 feet/feet across the area monitored. Figure 4 illustrates the ground water <br /> elevation contours. <br /> Advanced GeoEnvironmental,Inc. <br />