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w <br /> f <br /> 1 <br /> I20 June 2001 <br /> • AGE-NC Project No 98-0426 <br /> Page 2 of 4 _ <br /> r. t <br /> container and transported under chain-of-custody to McCampbell Analytical, Inc (MAI) The <br />' samples were analyzed for the following <br /> •` Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Methods 5030/8015-modified, x <br /> • Volatile aromatic compounds,- benzene, toluene, ethylbenzene and xylenes (BTEX) and <br /> Imethyl 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 <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 /> 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 /> water from the surveyed relative casing elevations (Table 1) Depths to ground water ranged from <br /> 21 30 feet to 22 38 feet as measured from the top of the well casings Relative ground water <br /> elevations at the site ranged from 77 62 feet in MW1, to 77 72 feet in MW2 The relative ground <br />' water elevation at the site increased an average of 0 5 feet between the February 2001 and May 2001 <br /> monitoring events Ground water was within the screened intervals in all three wells The ground <br /> water gradient was calculated to be 0 0033 fl/ft with anortheasterly flow direction The ground water <br />' elevation contours are depicted on Figure 2 _ <br /> ,r <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the water samples collected from MW2 and MW3 at concentrations of <br />' 870 µg/1 and 390 gg/l, respectively <br />' Benzene and toluene were detected only in the ground water sample from MW-3 (16 µg/1 and 0 76 <br /> }ig/l, respectively) Ethylbenzene and xylenes were detected in MW2 and MW3 at concentrations <br /> as high as 17 tLg/l and'29 pg/l, respectively <br />' Advanced GeoEnvironmental,Inc <br /> 1 � 1 <br />