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' 04 September 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 /> (DHSS)-certified 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 60218020, and <br /> • 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 /> 3.0. FINDINGS <br />' Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 07 August 2001,the contaminant Impact to ground water was assessed from the laboratory analytical <br />' data <br />' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the August 2001 sampling event,depths to ground water in wells MW 1 through MW7 <br /> ranged from 51 68 feet to 53 14 feet below the well heads Ground water elevations at the site ranged <br /> from 26 61 feet below mean sea level (MSL) to well MW4 to 27 16 feet below MSL in well MW6 <br /> (Table 1) Ground water elevations at the site decreased an average 4 3 6 feet since the second quarter <br /> 2001 monitoring event During this morutoring event, the depths to ground water in the wells were <br /> within the well screens,indicating that the wells are screened properly to yield representative shallow <br /> ground water samples <br /> The ground water flow direction was inferred to be flowing generally to the northwest at an average <br /> I hydraulic gradient of 0 005 feet/feet Figure 3 illustrates the contoured ground water elevations as <br /> measured on 07 August 2001 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> ITPH-g was detected in ground water samples collected from MW 1, MW2 and MW3 at <br /> concentrations of 1,700 µg/l, 13,000 gg/l,and 570µg/1,respectively TPH-d was detected in ground <br /> Advanced GeoEnvironmentai,Inc <br />