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' 29 June 2001 <br /> AGE-NC Project No 97-0343 <br />' Page 2 of 4 <br />' chain-of-custody to McCampbell Analytical, Inc (MAI) a Department of Health Services <br /> (DHS)-approved laboratory The ground water samples were analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in <br /> accordance with EPA Methods 5030/8015 Modified and 3550/8015 Modified, respectively, <br />' • Volatile aromatic compounds-benzene,toluene,ethylbenzene and total xylenes(BTEX)and <br /> methyl-tertiary butyl ether(MTBE) in accordance with EPA Method 602/8020, and <br /> I • Fuel oxygenates - MTBE, di-isopropyl ether (DIPE), ethyl-tertiary butyl ether (ETBE), <br /> tertiary-amyl methyl ether (TAME) and tertiary butanol (TBA) in accordance with EPA <br /> Method 8260 Modified <br /> I <br /> 3.4. FINDINGS <br /> Ground water elevation, flow direction andgr adient were determined from field data collected on <br /> 07 May 2001, the contaminant impact to ground water was assessed from the laboratory analytical <br /> data <br /> l3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> I At the time of the May 2001 sampling event, depths to ground water in wells MW 1 through MW7 <br /> ranged from 47 19 feet to 48 44 feet below the well heads Ground water elevations at the site ranged <br /> from 22 33 feet below mean sea level (MSL) in well MWS to 22 59 feet below MSL in well MW7 <br /> I (Table 1) Ground water elevations at the site increased an average 107 feet since the first quarter <br /> 2001 monitoring event During this monitoring event, the depths to ground water in the wells were <br /> approximately 7 19 to 13 32 feet below the tops of the well screens, indicating that the wells are <br /> screened properly and yield representative shallow ground water samples <br /> The ground water flow direction was inferred to be flowing to the west-northwest at an average <br /> hydraulic gradient of 0 002 feet/feet Figure 3 illustrates the contoured ground water elevations as <br /> measured on 07 May 2001 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> ITPH-g was detected in ground water samples collected from MW1, MW2 and MW3 at <br /> concentrations of 680 µg/1, 2,600 µg/1, and 420 ,ug/l, respectively TPH-d was detected in ground <br /> I <br /> Advanced GeoEnvtronmental,Inc <br /> I <br />