ARCHIVED REPORTS_XR0006923- CASE 2

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18 November 2004 • AGE-NC Project No 97-0351 ' Page 3 of 4 32 ANALYTICAL RESULTS OF WATER SAMPLES The results of laboratory analysis of ground water samples collected at the site on 22 April 2004 are ' as follows • TPH-g was detected in the sample from groundwater monitoring well MW-1 and MW-UST at concentrations of 1,700 micrograms per liter (µg/1) and 640 µg11, respectively • BTEX compounds were detected In the sample from monitoring well MW-1 at concentrations of 37 µ.g/1 benzene,3 5 µg/1 toluene,2 6µg11 ethylbenzene and 11 8 µg/l total ' xylenes • MTBE was not detected In the samples collected from wells MW-1 through MW-5 and MW-UST • No other petroleum hydrocarbon compounds were detected at or above laboratory detection limits Laboratory results of samples analyzed for petroleum hydrocarbons are summarized in Table 2 and Table 3 The laboratory report (CTEL Project No CT214-0404173), quality assurance/quality control reports and chain of custody forms are included in Appendix C Documents confirming the upload of laboratory electronic deliverable format (EDF) files and depth to water measurements to ' GeoTracker are included as Appendix D ' 4.0. SUMMARY AND CONCLUSIONS Based upon the results of this quarterly monitoring event,AGE concludes The round water flow direction was inferred to be northeast at adient of approximately • g 1�' pp Y 0 002 ft/ft which is consistent with previously determined flow directions and gradients • Dissolved petroleum hydrocarbons were detected in the samples collected from wells MW-1 and MW-UST ' • Benzene concentrations m MW-1 were significantly above the DHS'Maximum Contaminant Level of 1 0 µg11 in drinking water ' • At the present time, neither the vertical extent nor the western lateral extent of dissolved hydrocarbons have been defined Advanced GeoEnvironmental,Inc