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1 t <br />' 15 November 2001 Y <br /> AGE-NC Project No 98-0533 <br /> Page 2 of 3 <br /> Department of Health Services(DHS)-certified analytical laboratory for analysis The samples were <br />' analyzed for <br /> • Total petroleum hydrocarbons quantified as aviation gasoline(TPH-ag) In accordance with <br />' EPA Method 5030/8015M, <br /> • Volatile aromatic hydrocarbons-benzene,toluene,ethylbenzene and xylene(BTEX)and the <br />' oxygenated ether methyl tertiary-butyl ether(MTBE)in accordance with EPA Method 8020, <br /> • Fuel oxygenates - tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert-butyl ether <br /> (ETBE), tert-amyl methyl ether (TAME), and MTBE in accordance with EPA Method <br />' 8260B, and <br /> • Ethylene dzbromxde (EDB) and 1,2 dichloroethane (1,2 DCA) in accordance with EPA <br />' method 8260 <br />' At the request of the PHS-EHD, a ground water sample from the on-site domestic well was also <br /> collected and analyzed To ensure that formation water was being produced, water was allowed to <br /> run out of the well for approximately 20 minutes,which was long enough to automatically turn the <br />' well pump on Ground water was poured directly into the 40-mi VOA vials from a valve at the well <br /> head <br />' 3.0. FINDINGS <br />' Ground water elevation and flow direction were inferred from field data, hydrocarbon-impact to <br /> ground water was quantified by laboratory analysis of the ground water samples <br />' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' The elevation of ground water in each of the three monitoring wells was calculated by subtracting <br /> the depth to ground water from the surveyed relative casing elevations (Table 1) Depths to ground <br /> water averaged about 75 3 feet bsg Ground water elevations at the site ranged from 18 32 feet <br />' (MW-2) to 18 73 feet (MW-3) below mean sea level The ground water gradient was calculated to <br /> be 0 002 fM directed towards the northwest Figure 2 illustrates the contoured ground water <br /> elevations as measured on 22 August 2001 <br /> I <br /> 3 2 ANALYTICAL RESULTS OF WATER SAMPLES <br /> .� TPH-ag was detected in the water samples from MW-1 and MW-2 at concentrations of 68 µg/1 and <br /> 77 µg/1, respectively, toluene was also detected in the samples from MW-1 and MW-2 at <br /> concentrations of 2 8µg/1 and 2 7µg/l,respectively(see Figure 3) No other petroleum hydrocarbons <br /> were detected in ground water samples from the other monitoring wells and the domestic well <br /> Advanced GeoEnvironmental,Inc <br />