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10 January 2005 <br /> AGE-NC Project No 95-0184 <br />' Page 3 of 5 <br />' The ground water appeared to flow generally northeast across much of the site under an average <br /> hydraulic gradient of approximately 0 004 foot/foot (ft/ft, Figure 3 and Table 4) Wells MW-2 and <br /> VW-5 were not used in calculating gradient (Appendix C) <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH-o was detected in all of the samplmonitoring wells at concentrations ranging from <br /> ,6j 1 micrograms per liter (µg/1) in MW`�'to 210,000 pg/l in VW-2B (Figure TPH-d was <br /> detected in the sample from MW-4 at a concentration of 13,000 µg/1 A map of dissolved TPH <br />' concentrations is illustrated on Figure 4 <br /> �1'1 <br />' Various BTEX compounds were detected in all ground water samples analyzed The maximum <br /> concentrations detected were 30,000 µg/1 benzene (VW-2B), 42,000 µg/1 toluene, 12,000 µg/1 <br /> ethylbenzene, and 28,000 µg/1 total xylenes (VW-5B) A map of dissolved benzene concentrations <br />' is illustrated on Figure 5 10, <br /> • MTBE was detected in samples from wells MW-4, VW-2B, and VW-4 at concentrations ranging <br /> from 140 µg/1 (MW-4) to 300 µg/1 (VW-4) J <br /> The lead scavenger 1,2-DCA was detected in MW-2, MW-4 W-2B, VW , VW-4, VW-5B, and <br /> VW-5C at concentrations ranging from 5 7 µg/1(MW-2)to g/1 (VW- , EDB was detected in <br /> MW-4,VW-2B,VW-5B, and VW-5C at concentrations ranging from 35 µg/l(VW-5C)to 220 µg/1 <br /> t (VW-2B) A map of dissolved MTBE and 1,2-DCA concentrations is shown on Figure 6 <br /> Seven additional VOCs were detected at the following maximum concentrations naphthalene at <br />' 1,900 µg/1 (MW-4) 1,2,4-tnmethylbenzene at 4,400 µg/l�(VW-5B),�n-propylbenzene at 400 µg/1 <br /> (VW-5B)�1,3,5 trim ethylbenzene at 1,900 µg/l (VW-5B), isopropylbenzene at 190 µg/l (VW-5C),,--' <br /> p-isopropyltoluene at 67 µg/1 (VW-5B)!/and n-butylbenzene atg/l (VW,-Si�0 <br /> /go zP5 <br /> Analytical results of ground water samples are summarized in Tables 2 and 3 Copies of the <br /> laboratory report(CTEL Project No CT214-0409050), quality assurance/quality control(QA/QC) <br /> reports, and chain of custody forms are included in Appendix D Documents confirming the upload <br /> of laboratory electronic deliverable format (EDF) files and depth to water measurements to <br /> GeoTracker are included in Appendix E <br /> 1 <br /> • <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />