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, f 4 <br /> 4 ' <br /> . 16(October 2001 <br /> AGE-NC Project No 98-0426 ' <br />' Page 2 of 4 <br /> 4 <br /> I ; <br />' container and transported under chain-of-custody to McCampbell Analytical, Inc (MAI) The <br /> samples were analyzed for , <br /> f <br />' Total petroleum hydrocarbons-quantified as gasoline (TPH-g) in accordance with EPA <br /> Methods 5030/8015-modified, <br /> • Volatile aromatic compounds - benzene, toluene, ethylbenzene and xylenes (BTEX) and <br />' methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 8020,'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 r <br /> I I ~ <br /> 3.0. FINDINGS <br />' Ground water flow direction and gradient were Inferred from data collected in the field, the <br /> hydrocarbon impact to ground water was quantified by the laboratory data obtained from the ground <br />�'. water samples <br /> 31 RELATIVE-GROUND WATER ELEVATION AND GRADIENT <br /> The relative elevation of ground water in each well was calculated by subtracting the depth to ground <br /> water from the surveyed relative casing elevations (Table 1) Depths to ground water ranged from <br /> 22 37 feet to 23 48 feet as measured from the top of the well casings Relative ground water <br />' elevations at the-site ranged from 76 52'feet In MW1 to 76 65 feet in MW2 The relative ground <br /> water elevation at,the site increased an average of 1 1 feet between the May 2001 and August 2001 <br /> monitoring events Graund water was within the screened intervals in all three wells The ground <br /> water gradient was calculated to be 0 005 ft/ft with a northeasterly flow direction The ground water <br /> ' elevation'contours are depicted on Figure 2 A <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br />' TPH-g was detected in the water samples collected from MW1,MW2 and MW3 at concentrations <br /> of 60 µg/l; 859 µg/1 and 690 µg/1, rdspectively(Figure 3) <br /> F r l V 41 <br /> Benzene and toluene were detected only in the ground water'sample from MW-3 (18 µg/1 and 1 8 <br />' <br /> µ�1 lenes were detected in MW2 and MW3 at concentrations ` <br /> (� respectively)y) Eth Ylbenzene and'xylenes <br /> as high as 28 µg/1 and 79 µg/l, respectively <br /> Advanced GeoEnviroomental,Inc <br /> d , <br /> f <br />