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02 May 2001 <br /> yl f <br /> AGE-NC Project No, 98-0426 r NI <br /> , <br />' Page'2 of 4 - <br />' container and transported under chain--of-custody, to McCampbell Analytical; Inc (NW} The` <br /> samples were analyzed-for the following Y <br /> J L n S <br /> • ,Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Methods 5030/8015-modified, <br />' 0 Volatile aromatic compounds - benzene,-toluene, ethylbenzene and xylenes (BTEX) and z, <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 Mbdified , <br /> 1 1 <br /> F � <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 /> s , <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 rangedfrom <br /> 21'80,feet to 22'90 feet as measured from the top of the,well casings Relative ground water <br /> elevations at the site ranged frori 77 10 feet in MW 1 to.77 22 feet in MW2 The relative ground <br /> ? water elevation=at the site decreased an average of 0 18 feet between' the,November 2000 and ' <br /> February 2001 momtonng events Ground water was within the screened intervals in all three weds <br /> The ground water gradient was calculated to be 0 004 ft/ft with a north-northeasterly flow direction <br /> The ground water elevation contours are depicted on Figure 2 ' <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES '* a ' <br />' TPH-g was,detected in the water,samples collected from MW2 and MW3 at concentrations of f <br /> 1,200 µg/1 and 220 jig/,, respectively <br />'I Benzene was detected only m,the groundwater sample from MW-3 (7 8 µg/1) Ethylbenzene and „ ^" <br /> . xylenes were detected in MW2 and MW3 at concentrations as high as, 23 µg/1 and 63 `gg/l, <br /> respectively <br /> , <br /> , I <br /> y Advanced GeoEnvironmental,Inc <br /> r I <br /> c <br /> y <br />