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14 March 2005 <br /> AGE-NC Project No 02-0950 <br /> Page 2 of 4 <br /> preservative After collection, the samples were properly labeled,placed in a chilled container, and <br /> transported under chain of custody to Cal Tech Environmental Laboratories (CTEL), a California <br /> Department of Health Services(DHS)-certified analytical laboratory,for analysis The samples were <br /> analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Method 8015 Modified, <br /> • Benzene,toluene,ethylbenzene,and total xylenes(BTEX)and fuel additives methyl tertiary- <br /> butyl ether(MTBE),tertiary-butyl alcohol (TBA),di-isopropyl ether(DIPS), ethyl tertiary- <br /> butyl ether(ETBE),tertiary-amyl methyl ether(TAME), 1,2-dichloroethane(1,2-DCA),and <br /> 1,2-dibromoethane (EDB) in accordance with EPA Method 8260B, and <br /> • Lead in accordance with EPA Method 6010B <br />' 3.0. FINDINGS <br />' . Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 21 December 2004 The contaminant impact to soil and ground water was quantified from laboratory <br /> analytical data <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> IAt the time of the December 2004 sampling event, depths to ground water ranged from 20 00 feet <br /> (MW-3)to 20 30 feet(MW-2)below the tops of the well casings Ground water elevation at the site <br /> I averaged approximately 12 35 feet below mean sea level (MSL), indicating an increase in ground <br /> water elevation of approximately 0 57 feet between September and December 2004 (Table 1) <br /> During this monitoring event,the ground water levels in the wells were at least 6 feet below the tops <br />' of the well screens, indicating that the wells are screened properly to yield representative shallow <br /> ground water samples <br />' Ground water was inferred to be flowing toward the north-northeast under a hydraulic gradient of <br /> approximately 0 005 foot/foot (ft/ft) Figure 3 illustrates the contoured ground water elevations as <br /> measured on 21 December 2004 Ground water directions and gradients can vary greatly,as they are <br /> influenced by seasonal changes to the static water table <br /> Advanced GeoEnvironmentai,Inc <br /> I <br />