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t , <br /> F <br /> II <br /> 21 December 2001 <br /> AGE-NC Project No 98--0521 <br /> Page 3 of 4 <br /> I t t <br /> ' 30. FINDINGS <br /> The ground water flow dhrection and gradient were inferred from the field data Dissolved petroleum <br /> l hydrocarbon impact to ground water was quantified by laboratory analysis of the samples collected <br /> , <br /> 3 1 GROUND WATER ELEVATION, FLOW DIRECTION AND GRADIENT <br /> A On 26 November 2001,the depth to groundwater at the site ranged from 8 04 to 8 39 feet below the <br /> ' tops of the well casings The groundwater elevations at the site ranged from-7 72 feet to -8 06 feet <br /> mean sea level (msl) The ground water flow was directed toward the northeast with a hydraulic <br /> gradient calculated to be 0 008 foot/foot Depth to water and groundwater elevation are summarized ' <br /> in Table 1 Figure 3 illustrates the contoured ground water elevations <br /> ' 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> The results of the November 2001 monitoring event are as follows <br /> • TPH-g was not detected in the samples collected from moriitorulg wells MW-1, MW-2,and <br /> MW-3 TPH-g was detected in the sample collected, from,momtorrng well MW-4 at a <br /> concentration of 1,000 micrograms per liter (µg/1) { <br /> E BTEX compounds were detected in the sample collected from rxaamtoruig well'MW-4 at <br /> Iconcentrations of 91 µg/1 benzene, 17 µg/l toluene, 48 µg/1 ethylbenzene and 150 µg11 total <br /> xylenes, respectively BTEX compounds,were not detected in the samples collected from <br /> monitoring wells MW-1, MW-2 aril MW-3 <br /> MTBE Was detected by TEPA Method 8020 in,ground water samples MW-1, MW-2 and <br /> MW-4 at;concentrations'af 22 µg11, 310 µg/l and 170 µg11,`respectively The MTBE results i <br /> ,were confirmed by EPA;method 8260 Modified at 20 µg/l, 350 µg/1 and 170 µg11, <br /> respectively No other fuel oxygenates were detected in these samples 7 <br /> Analytical results from the monitoring well ground water samples are sumni=ed in Tables s2and 3 <br /> un <br /> The,laboratory report (MAI Lab IDs 84256, through 84259),QA/QCl and chain-of custody are <br /> axicluded 11in Appendlx C <br /> t <br /> I <br /> r 1 <br /> t <br /> Advanced GenEnwron ental,Inc <br /> I I I <br /> t 1 I I 1 0 1 ,j1 <br /> , t , <br />