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28 July 2003 <br /> • AGE-NC Project No 95-0184 <br /> Page 3 of 5 <br /> The ground water appears to flow generally northeast across much of the site at a hydraulic gradient <br /> of approximately 0 004 feet/feet (Figure 2), however, In the northwestern portion of the site the <br /> inferred ground water gradient was 0 007 feet/feet <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH- was detected m all of the sampled monitoring wells at concentrations rangingfrom <br /> g P g <br /> 1,500 micrograms per liter(µg/1)In MW-7 to 420,000µg/1 In VW-3 (Figure 3) TPH-d was detected <br /> In the sample from MW-4 at a concentration of 71,000 µg/l A map of TPH concentrations is <br /> provided In Figure 3 <br /> tBTE&X compounds were detected in all ground water samples analyzed The maximum <br /> concentrations detected were 70,000µg/1 benzene In sample VW-2B,55,000µg/1 toluene in VW-213, <br />' 6,300µg11 ethylbenzene in VW-3,and 35,000µg/1 total xylenes In sample MW-4 A map ofbenzene <br /> concentrations Is provided in Figure 4 <br /> I MTBE was detected In samples from wells MW-4, VW-213, VW-3 and VW-4 at concentrations <br /> ranging from 81 µg/1 in sample VW-3 to 850µg/1 in sample VW-4 A map of MTBE concentrations <br /> Is provided in Figure 5 <br /> IThe lead scavengers 1,2-dichloroethane(1,2-DCA)and 1,2-dibromoethane(EDB)were detected in <br /> multiple wells, at concentrations ranging from 8 2 µg/1 (MW-2) to 350 µg/1 (VW-4) and 49 µg/1 <br /> I (MW-4) to 110 µg/1 (VW-2B), respectively A map of 1,2-DCA concentrations Is provided In <br /> Figure 5 <br /> ISeven additional VOCs were detected at the following maximum concentrations naphthalene at <br /> 3,300 µg11 (MW-4), 1,2,4-tnmethylbenzene at 5,900 µg/1 (MW-4), n-propyl benzene at 450 µg/1 <br /> (VW-5B), 1,3,5 tnmethylbenzene at 1,100 µg/l (MW-4 and VW-3), isopropylbenzene at 120 µg/1 <br /> (VW-5B), and p-isopropyltoluene 28 µg/l (VW-5B) <br />' Analytical results of ground water samples are summanzed on Tables 2 and 3 Copies of the <br /> laboratory report (CTEL Project No CT214-0306009) and chain-of-custody forms are in <br /> Appendix C <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br /> Advanced GeoEnvironmental,Inc <br />