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13 March 2005 <br /> AGE-NC Project No 96-0263 <br /> IPage 3 of 4 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in water samples MW-2, MW-4, MW-5 and MW-7 at concentrations ranging <br /> from 100 micrograms per liter (µg/1) in MW-4 to 12,000 µg/1 in MW-7 <br /> Benzene was detected in water samples MW-2, MW-5 and MW-7 at concentrations ranging from <br /> 4 1 µg11 in MW-2 to 140 µg/1 in MW-7 Toluene, ethylbenzene and total xylenes were detected in <br /> one or more of the same wells at concentrations as high as 52 µg/1, 56 µg11 and 129 µg/1,respectively <br /> (MW-7) <br /> MTBE was detected in samples MW-2, MW-4, MW-5, and MW-7 at concentrations ranging from <br /> 48 µg/l(MW-5)to 11,000µg/l(MW-7) TAME and 1,2-DCA were detected in the sample collected <br /> from well MW-7 at concentrations of 7 5 µg/l and 3 7 µg/l, respectively No other fuel additives <br /> were detected in the ground water samples collected from the site <br /> The current and past ground water sample analytical results are summarized in Tables 2 and 3 <br /> Copies of the laboratory report (CTEL Project No CT214-0411062), quality assurance/quality <br /> control (QA/QC) report and chain of custody forms are in Appendix C GeoTracker confirmation <br /> pages of the submitted laboratory electronic deliverable format (EDF) files are included in <br /> Appendix D <br /> 33 OZONE INJECTION PILOT TEST <br /> Ozone injection began at the site on 01 June 2004 The ozone injection operational protocol, as <br /> established by ozone units designer manufactures, follows the recommended two-hour ozone <br />' injection cycle at each sparge-point The injection rate is approximately 10 pounds per squar inch <br /> (psi)to displace the ground water within the sparge wells and no greater than 2 cubic feet per minute <br /> (CFM) to inject the ozone <br /> After completing a cycle through all nine ozone wells, the ozone injection ceases for a 2-hour <br /> mechanical hiatus, after which, the injection cycle through all of the sparge wells restarts <br /> 1 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the results of this investigation, AGE concludes that <br /> Depth to ground water ranged from 6 80 feet to 8 12 feet below the tops of the well casings <br /> • Ground water elevations at the site ranged from 28 75 feet above MSL in well MW-9 to <br />' Advanced CcoEnvironmental,Inc <br />