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' 06 May 2004 <br /> AGE-NC Project No 95-0184 <br />' Page 3 of 5 <br /> r <br /> The ground water appears to flow generally southwest across much of the site under an4l-average <br />' hydraulic gradient of approximately 0 005 foot/foot (Figure 2 and Table 4), however, in the <br /> northwestern portion of the site the inferred ground water gradient was steeper at approximately <br />' 0 013 feet/feet Well VW-5C was not used in calculating gradient and angled well VW-513's ground <br /> water elevation was calculated as shown in Appendix D <br /> 1 32 ANALYTICAL RESULTS OF WATER SAMPLES <br />' TPH-g was detected in all of the sampled monitoring wells at concentrations ranging from <br /> 200 micrograms per liter(µg/1)in MW-7 to 130,000 µgd in VW-2B(Figure 3) TPH-d was detected <br /> in the sample from MW-4 at a concentration of 38,000 µg/1 A map of TPH concentrations is <br />' provided in Figure 3 <br /> Various BTEX compounds were detected in all ground water samples analyzed The maximum <br />' concentrations detected were 56,000µg/1 benzene,27,000µg/1 toluene,6,800µg/1 ethylbenzene,and <br /> 30,300 µg/l total xylenes (VW-2B) A map of benzene concentrations is provided in Figure 4 <br /> MTBE was detected in samples from wells MW-4, VW-2B, VW-3 and VW-4 at concentrations <br /> ranging from 50 µg/1 (MW-4) to 510 µg/1 (VW-4) A map of MTBE concentrations Is provided in <br /> Figure 5 <br /> The lead scavenger 1,2-dichloroethane (1,2-DCA) was detected to MW-1, MW-2, MW-4 and <br /> VW-2B through VW-5C at concentrations ranging from 6 6 µg/1 (MW-1) to 970 µg/1 (VW-4), <br /> 1,2-dibromoethane (EDB) was detected in MW-4 and VW-2B at a maximum concentration of <br /> 100 µg/1 (VW-2B) A map of 1,2-DCA concentrations Is provided in Figure 5 <br /> Six additional VOCs were detected at the following maximum concentrations naphthalene at <br /> 690 µg/1 (MW-4), 1,2,4-tnmethylbenzene at 3,500 µg/l (VW-5B), n-propyl benzene at 210 µg/1 <br /> (VW-5B), 1,3,5 tnmethylbenzene at 800 µg/l(VW-5B),isopropylbenzene at 350 µg/l(VW-4), and <br /> p-isopropyltoluene 10 µg/1 (VW-5C) <br /> Analytical results of ground water samples are summarized on Tables 2 and 3 Copies of the <br /> laboratory report (CTEL Project No CT214-0312044) and chain-of-custody forms are in <br /> Appendix C , <br /> 1 ry <br /> Advanced GeoEnvironmental,Inc <br /> I <br />