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07 March 2003 <br /> • AGE-NC Project No 00-0764 <br /> ' Page 3 of 4 <br /> ' (MW-1) to 18 71 feet (MW-5) below mean sea level The relative ground water elevation data is <br /> summarized in Table 1 <br /> Ground water flow direction in the area of the former USTs was inferred to be towards the east to <br /> northeast at a gradient of approximately 0 003 feetifeet The ground water elevation contours are <br /> depicted in Figure 3 <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> ' The results of laboratory analysis of ground water samples collected at the site on 24 January 2003 <br /> are as follows <br /> ' e TPH-g was detected in the samples from groundwater monitoring wells MW-3,MW-4 and <br /> MW-5 at concentrations of 340 micrograms per liter (µg11), 140 µg/1 and 110 pg/l, <br /> ' respectively TPH-d was not detected in any of the samples <br /> • Benzene was detected in the sample from monitoring well MW-3 at 6 9 µg/1 benzene In <br /> • addition, xylene was detected In the sample MW-3 at 2 3 gg/l <br /> • DIPE was detected in the samples collected from wells MW-3 and MW-4 at concentrations <br /> of 2 7 µg/1 and 4 2 µg/l, respectively 1,2-DCA was only detected in sample MW-4 at 7 9 <br /> gg/1 1,1-DCA was detected In the samples collected from wells MW-3 and MW-4 at 9 5 <br /> µg/l and 10 µg11, respectively <br /> ' • In addition,isopropylbenzene was detected in sample MW-3 at 4 7µg/1 and naphthalene was <br /> detected in sample MW-3 at a concentration of 5 5 µg/1 <br /> No additional target analytes were detected in the samples analyzed Laboratory results of samples <br /> analyzed for petroleum hydrocarbons are summarized in Table 2 and Table 3 The laboratory report <br /> (CTEL Laboratory ID 0301-114-1 through-6)and chain-of-custody form Is included in Appendix C <br /> ' 4.0. SUMMARY AND CONCLUSIONS <br /> Based upon the results of this quarterly monitoring event, AGE concludes <br /> Ground water flow direction was inferred to be towards the east at a gradient of <br /> approximately 0 003 feet/feet This flow direction is consistent with flow direction from <br /> previous monitoring events <br /> • The highest concentrations of dissolved petroleum hydrocarbons were detected in the sample <br /> collected from well MW-3, near the former UST location <br /> Advanced GeoEnvironmental,Inc <br />