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I � , <br /> I <br /> . 21 December 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)-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 />' • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl-tertiary butyl ether <br /> (MTBE) in accordance with EPA Method 60218020, and <br /> t 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 /> 1 <br />' 3.0. FINDINGS <br /> Ground water elevation, flow direction. and gradient were determined from field data collected on <br />'. 06 November 2001, the contaminant Impact to ground water was assessed from the laboratory <br /> analytical data <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' At the time of the November 2001 sampling event, depths to ground water in wells MW4 through <br /> MW7 ranged from 55 61 feet to 56 88 feet below the well heads Ground water elevations at the site <br /> ranged from 30 71 feet below mean sea level (MSL) in well MW4 to 30 90 feet below MSL In well <br />' MW6 (Table 1) Ground water elevations at the site decreased an average 3 91 feet since the third <br /> quarter 2001 monitoring event During this monitoring event, the depths to ground water in wells <br /> MW4 through MW7 were within the well screens, Indicating that the wells are screened properly to <br /> ryield representative shallow ground water samples Ground water was below the well screens of <br /> MW 1, MW2 and MW3, preventing monitoring and sampling of these wells <br />' The ground water flow direction was inferred to be flowing generally to the northwest at an average <br /> hydraulic gradient of 0 002 feet/feet Figure 3 Illustrates the contoured ground water elevations as <br />' measured on 06 November 2001 <br /> • <br /> 1 <br /> Advanced GeoEnveronmental,Inc <br /> 1 <br />