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' 12 November 2004 <br /> AGE-NC Project No 95-0184 <br />' Page 3 of 5 <br />' The groundwater appeared to flowgenerally east-northeast across much of the site under an average <br /> hydraulic gradient of approximately 0 003 foot/foot(Figur <br /> e 3 and Table 4) WellfVW-5 s not used <br /> in calculating gradient (Appendix C) 31 <br /> 1 <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES <br />' TPH-g was detected in all of the sampled monitoring wells at concentrations ranging from <br /> 1,100 micrograms per liter (µg/1) in MW-3 to 210,000 µg/1 in VW-2B (Figure 3) TPH-d was <br />' detected in the sample from MW-4 at a concentration of 28 pg/� A map of TPH concentrations is <br /> illustrated on Figure 4 -4 �QA J)1' <br /> i� <br />' Various BTEX compounds were detected in all ground water samples analyzed The maximum <br /> concentrations detected were 42,000 µg/1 benzene (VW-2B),48,000 µg/1 toluene, 7,500 µg/1 <br /> ethylbenzene,and 38,000µg/1 total xylenes(VW-5B) Amap ofbenzene concentrations is illustrated <br />' on Figure 5 1� <br />' MTBE was detected in samples from wells MW-4, VW-213, VW-3 and VW-4 at concentrations <br /> ranging from 71 µg/l (MW-4) to 860 pg/1 (VW-4) <br />' The lead scavenger 1,2-dichloroethane (1,2-DCA) was detected in MW-2, MW-4, and VW-2B <br /> through VW-5C at concentrations ranging from 8 3 µg/1 (MW-2) to 540 µg/1 (VW-4), <br /> 1,2-dibromoethane (EDB) was detected in MW-4, VW-2B, VW-4, and VW-5B at concentrations <br />' ranging from 13 µg/1 (VW-4)to 400 pg/1(VW-2B) A map of MTBE and 1,2-DCA concentrations <br /> is shown on Figure 6 <br />' Seven additional VOCs were detected at the following maximum concentrations naphthalene at <br /> 1,900 µg/l (VW-2B)/1,2,4-trimethylbenzene at 5,000 µg/l,(VW-5B}n-propylbenzene at 260 µg11 <br /> (VW-5B), 1,3,5 tnmethylbenzene at 1,200 pg/1(VW-5B);sopropylbenzene at 130 µg/1 (VW-5C), <br />' p-isopropyltoluene at 9 8 gg/l (VW-5C), and n-butylbenzene at 56 µg/1 (VW-5C) <br /> Analytical results of ground water samples are summarized in Tables 2 and 3 Copies of the <br />' laboratory report (CTEL Project No CT214-0406072) and chain of custody forms are attached as <br /> Appendix D Documents confirming the upload of laboratory electronic deliverable format (EDF) <br /> files and depth to water measurements to GeoTracker are included as Appendix E <br /> 1 <br />' Advanced GeoEnvironmental,Inc <br />