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I " j j ! 03 December 2003 AGE-NC Project No 95-0184 Page 3 of 5 II ' The ground water appears to flow generally northeast across much of the site under and average hydraulic gradient of approximately 0 004 foot/foot (Figure 2 and Table 4), however, in the northwestern portion of the site the inferred ground water gradient was slightly steeper at ' approximately 0 007 feet/feet Well VW-5C was not used in calculating gradient and deviated well VW-513's groundwater elevation was adjusted as shown in Appendix D ' 3 2 ANALYTICAL RESULTS OF WATER SAMPLES ' TPH-g was detected in all of the sampled monitoring wells at concentrations ranging from 260 micrograms per liter(µg/1)`in MW-7 to 162,000µg/1 in VW-5C(Figure 3) TPH-d was detected in the sample from MW-4 at a concentration of 210,000 µg/1 A map of TPH concentrations is ' provided in Figure 3 1 Various BTEX compounds were detected in'all ground water samples analyzed with exception to MW-7 The maximum concentrations detected were 25,000 µg/1 benzene(VW-2B), 38,000 lig/l toluene(VW-5C), 5,800 µg/1 ethylbenzene (VW-3), and 25,600 µg/1 total xylenes (VW-3) A map ' of benzene concentrations is provided in Figure 4 MTBE was detected in samples from wells MW-4, VW-2B, VW-3 and VW-4 at concentrations ' ranging from 67 gg/1 (MW-4) to 550 µg/l (VW-4) A map of MTBE concentrations is provided in Figure 5 ' The lead scavenger 1,2-dichloroethane (1,2-DCA) and as detected n MW-2, MW-4 and VW-2B through VW-5C at concentrations ranging from 7 2 µg/l (MW-2) to 410 µg/1 (VW-4), 12-dibromoethane (EDB) was detected in MW-4 and VW-2B at a maximum concentration of ' 110 µg/1 (VW-2B) A map of 1,2-DCA concentrations is provided in Figure 5 ` Six additional VOCs were detected at the following maximum concentrations naphthalene at ' 680µg/1, 1,2,4-tnmethylbenzene at 4,000µg/1,n-propyl benzene at 390µg/I, 1,3,5 tnmethylbenzene at 1,200 4g/1,isopropylbenzene at 120 Agll,and p-isopropyltoluene 17 µg/1 all from sample VW-5C I I ' Analytical results of ground water samples are summarized on Tables 2 and 3 Copies of the laboratory report (CTEL Project No CT214-0308075) and chain-of-custody forms are in Appendix C • I Advanced GeoEnvironmental,Inc }