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29 October 2004 <br /> AGE-NC Project No 97-0351 <br /> ' Page 3 of 4 } <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> 1 <br /> TPH-g was detected in the water samples from MW-1 and MW-UST at concentrations of <br /> 1,800 micrograms per liter(µg/1) and 370 µg/l, respectively BTEX was detected in well MW-1 at <br /> concentrations of 38 µg/1 (benzene), 4 7 4g/1 (toluene), 5 1 µg/1 (ethylbenzene), and 15 µg/1 <br /> - (xylenes) No other petroleum hydrocarbons were detected in ground water samples from the other <br /> monitoring wells <br /> Analytical results of ground water samples are summarized in Table 2 The laboratory report(CTEL <br /> ' Project No CT214-0408053), quality assurance/quality control report, and chain of custody forms <br /> are Included in Appendix C Documents confirming the upload of laboratory electronic deliverable <br /> format (EDF) files and depth to water measurements to GeoTracker are Included in Appendix D <br /> 4.0 SUMMARY AND CONCLUSIONS <br /> Based on data collected at the site AGE concludes <br /> • Depth to ground water at the site averaged approximately 8 98 feet bsg on 06 August 2004 <br /> • Ground water elevation in the monitored area ranged from 0 95 feet to 1 07 feet above MSL <br /> ' Flow direction was Inferred to be toward the northeast under a gradient of approximately <br /> 0 001 ft/ft <br /> ' 0 TPH-g was detected in the ground water samples from wells MW-1 and MW-UST <br /> • BTEX was detected in the groundwater sample from well MW-1 BTEX was not detected <br /> in the former UST excavation <br /> ' 0 Benzene concentrations in MW-1 were significantly above the DHS's Maximum <br /> Contaminant Level of 10 µg/1 in drinking water <br /> ' 0 At the present time, the vertical extent of dissolved hydrocarbons has not been defined <br /> ' 5.0. RECOMMENDATIONS <br /> Based on the findings recounted in this report, AGE recommends <br /> • Continuation of quarterly groundwater monitoring events The next event should take place <br /> ' in November 2004 <br /> • Conduct an updated well-head elevation survey <br /> Advanced GeoEnvironmental,Inc <br />