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1 <br />' 15 June 2006 <br /> AGE-NC Project No 04-1045 <br />' Page 2 of 4 <br />' and the sampler's initials and transported in a chilled container under chain of custody to Cal Tech <br /> Environmental Laboratories(CTEL),a Department of Health Services-certified analytical laboratory, <br /> for analysis The samples were 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) in accordance with EPA Method <br /> 8260, and <br />' • The fuel additives di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), methyl <br /> tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> 1,2-Dichloroethane (1,2-DCA) and 1,2-Dibromoethane (EDB) by EPA Method 8260 <br />' Modified <br />' 3.0. FINDINGS <br /> l <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> ie 19 April 2006 The contaminant impact to ground water was quantified from the laboratory <br /> analytical data <br /> 1 <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' At the time of the April 2006 sampling event, depths to ground water ranged from 17 46 feet <br /> (MW-3)to 18 03 (MW-2)feet below the tops of the well casings(Table 3),water levels were at least <br />' 2 46 feet below the top of the well screens, indicating that the wells are properly screened and <br /> representative of shallow ground water conditions The average calculated ground water elevation <br /> was approximately 8 04 feet below mean sea level (MSL) <br /> 3 <br /> .,W <br /> Ground water flow was inferred to be east,,at a hydraulic gradient of approximately 0 002 feet per <br />' foot(ft/ft) Figure 3 illustrates the contoured ground water elevations as measured on 19 April 2006 <br />' 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the ground water sample collected from well MW-1 at a concentration of <br />' 190,000 micrograms per liter (µg/1) <br /> • All BTEX compounds were detected in ground water samples collected from well MW-1,maximum <br />' Advanced GeoEnvironmental,Inc <br />