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, 04 December 2000 <br /> AGE-NC Project No 98-0426 _ <br /> 1' Page 2 of 4 r <br /> ,Y <br />' container and transported under chain-of-custody to McCampbeIl Analytical, Inc (MAI) The <br /> samples were analyzed for the following <br /> • t <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 /> A Fuel oxygenates MTBE, di-isopropyl ether (D1PE), 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 flow direction was determined during the sampling event and adient was inferred <br /> I . g p g �' <br /> . from data collected in the field, the hydrocarbon impact to ground water was quantified by the <br />�I laboratory data obtained from the ground water samples ` <br /> 3 1 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 /> r water from-the surveydd relative casing elevations (Table 1) Depths to ground water ranged from <br /> 21 58 feet to 22 75`feet as measured from the top of the well'casings Relative ground water <br /> elevations at the site ranged from 77 25 feet in MWI to 77 44 feet in MW2 The relative ground <br /> I water elevation at,the site decreased an average of 1 30 feet between the July 2000 and November <br /> s 2000 monitoring events Ground water was within the screened intervals in all three wells The <br />' ground water gradient was calculated to be 0 006 ft/ft with a northeasterly flow direction The ground <br /> water contours are depicted on Figure 3 <br /> f _ <br /> Ir � <br /> , 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the water samples collected from MW1', MW2 and MW3 atconcentrations <br /> of 70 µg/1, 280µg/1 and 790 µg/l, respectively , <br /> IEthylbenzene and xylenes were detected in,MW1 and MW2 afconcentrations as high ds 301ug/l and <br /> . 63 4g/1, respectively All BTEX compounds were detected in the water sample from MW2 at <br /> concentrations ranging from 14 µg11 toluene to 14 µg/1 benzene <br /> s , <br /> Advanced GeoEnvironmental,Inc <br /> , <br />