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, , f <br /> _ 4 <br /> 7 1 i <br />' 07 May 2004 <br /> • AGE-NC Project No 03-1100 <br /> Page 2 of 4 <br /> After collection, the samples were properly labeled, placed in a chilled container and transported <br />' under chain-of-custody to Cal Tech Environmental Labratones, Inc (CTEL) for analysis The <br /> samples were analyzed for v <br />' a Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015-modified, <br />' 0 Benzene,toluene,ethylbenzene and xylenes(BTEX)in accordance with EPA Method 8260B , <br /> and <br />' 0 Fuel oxygenates methyl tertiary-butyl ether (MTBE), dl-Isopropyl ether (DIPE), ethyl <br /> tertiary-butyl ether(ETBE),tertiary-amyl methyl ether(TAME), and tertiary butanol(TBA) <br /> in accordance with EPA Method 8260B <br />' 3.0. FINDINGS <br /> Y <br /> Ground water elevation, flow direction and gradient were determined from field data collected on' <br /> 23 December 2003 The contaminant Impact to ground water was quantified by the laboratory <br /> analytical data <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' At the time of the°December 2003 sampling event, depths to ground water ranged from 43 30 feet <br /> to 44 86 feet below the tops of the well casings During this monitoring event,the ground water level <br /> in the wells was approximately 13 30 to 14 86 feet below the tops of the well screens,indicating that <br /> the wells are screened properly and yield representative shallow ground water samples <br /> N <br /> Ground water elevations at the site ranged from 23 84 feet below mean sea level (MSL)in well <br /> MW-7 to 24 56 feet below'MSL in well MW-4 (Table 1) <br /> a , <br /> The'relative ground water elevation at the site increased an average of 12 feet between the <br /> September 2003 and December 2003 monitoring events <br /> f <br /> Wells MW-1'through MW-7 were used to infer ground water flow direction and gradient' The <br /> ground water flow direction was inferred to be south-southeast at the former UST location The <br /> hydraulic gradient was determined to be 0 009 feet/feet or less Figure 3 illustrates the contoured <br />' ground water elevations as measured on 23 December 2003 <br /> Advanced GeoEnvjronmental,Inc ti <br /> 5 <br />