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' 08 August 2000 <br /> AGE-NC Project No 99-0657 <br />' Page 2 of 4 <br />' labeled, placed in a chilled container and transported under chain-of-custody to Alpha Analytical <br /> Laboratories, Inc (AAL) for analysis The samples were analyzed for the following <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Methods 5030/8015-modified for fuels, <br /> • Volatile aromatic compounds benzene, toluene, ethylbenzene and xylenes (BTEX) in <br /> accordance with EPA Method 8020, <br /> • Volatile organic compounds and fuel oxygenates methyl tertiary-butyl ether (MTBE) di- <br /> isopropyl ether (RIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether <br /> (TAME), and tertiary butanol (TBA) in accordance with EPA Method 8260 <br /> 3.0. FINDINGS <br />' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> lie At the time of the July 2000 sampling event, depths to ground water ranged from 3142 feet to 32 71 <br /> feet below the tops of the well casings Relative ground water elevations at the site ranged from 9 30 <br /> feet above mean sea level (MSL) in well MW3 to 9 82 feet above MSL in well MW I (Table 1) <br /> During this monitoring event, the depths to ground water in the wells were approximately 140 to <br /> 2 70 feet below the tops of the well screens, indicating that the wells are screened properly and yield <br /> representative ground water samples <br /> I Ana apparent ground water mound has developed west of the former UST excavation To the east of <br /> pp �' p <br /> I the UST excavation, the ground water is flowing to the east-northeast Ground water is flowing in <br /> a southeasterly direction to the south of the UST excavation The hydraulic gradient ranges form <br /> 0 008 feet/feet to 0 01 feet/feet Figure 3 illustrates the contoured ground water elevations as <br /> Imeasured on 07 July 2000 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the all four ground water samples at concentrations ranging from 310 µg11 <br /> in MW2 to 15,000µg/1 in MW4 TPH-d was only detected in samples MWI and MW-4 at 580 µg/1 <br /> and 600 4g/1, respectively <br /> Benzene was detected in all four water samples at concentrations ranging from 5 9 µg/1 in MW3 to <br /> . 2,100 µg/1 in MW4 Toluene, ethylbenzene and xylenes were detected in the four samples at <br /> concentrations as high as 1,300 µg/l (toluene in sample MW4) <br /> IAdvanced GeoEnvironmentaI,Inc <br /> I <br />