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1 <br /> 12 May 2004 <br /> AGE-NC Project No 97-0351 <br /> ' Page 3 of 4 <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES <br /> 1 <br /> The results of laboratory analysis of ground water samples collected at the site on 27 January 2004 <br /> ' are as follows <br /> • TPH-g was detected in the sample from ground water monitoring well MW-UST at a <br /> T concentration of 5,900 micrograms per liter (µg11) - <br /> ' • BTEX compounds were detected In the sample from monitoring well MW-UST at <br /> concentrations of 85 gg/l benzene, 4 7 pg/l toluene and 8 2 gg/l total xylenes <br /> 1 • MTBE was not detected In the samples collected from wells MW-1 through MW-5 and <br /> MW-UST <br /> • No other petroleum hydrocarbon compounds were detected at or above laboratory detection <br /> limits <br /> ' Laboratory results of samples analyzed for petroleum hydrocarbons are summarized in Table 2 and <br /> Table 3 The laboratory report(CTEL Project No CT214-0401171) and chain-of-custody form are <br /> 1. included in Appendix C <br /> ' 4.0. SUMMARY AND CONCLUSIONS <br /> Based upon the results of this quarterly monitoring event, AGE concludes <br /> ' • The ground water flow direction was Inferred to be northeast at a gradient of approximately <br /> 0 002 ft/ft which Is consistent with previously determined flow directions and gradients <br /> • Dissolved petroleum hydrocarbons were only detected in the sample collected from well <br /> MW-UST <br /> • Benzene concentrations In MW-UST were significantly above the DHS's Maximum <br /> tContaminant Level of 10 [g/1 In drinking water <br /> • At the present time, neither the vertical extent nor the western lateral extent of dissolved <br /> hydrocarbons have been defined <br /> t5,0. RECOMMENDATIONS <br /> ' Based on the results of this Investigation, AGE recommends <br /> • Continued quarterly ground water monitoring <br /> ' Advanced Gen Environmental,Inc <br />