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17 May 2005 <br /> I <br /> • AGE-NC Project No 96-0263 <br /> Page 3 of 5 <br />' 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in water samples MW-2 and MW-7 at concentrations of 420 micrograms per <br />' liter (µg/1) in MW-2 and 9,200 pg/l in MW-7 <br /> i <br /> Benzene was detected in water samples MW-2 and MW-7 at concentrations of 3 2µg/l in MW-2 and <br />' 240 µg/1 in MW-7 Toluene, ethylbenzene and total xylenes were detected in one or more of the <br /> same wells at concentrations as high as 35 µg/l, 61 µg/1 and 92 µg/1, respectively (MW-7) <br />' MTBE was detected in samples MW-2, MW-4 and MW-7 at concentrations ranging from 18 µg/l <br /> (MW-4)to 7,100 µg/l (MW-7) TAME was detected in the sample collected from well MW-7 at a <br /> concentration of 9 6 µg/1 No other fuel additives were detected in the ground water samples <br />' 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 CT214-0503089), 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 />' 3 3 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-manufacture, 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 />' 4.4. SUMMARY AND CONCLUSIONS <br />' Based on the results of this investigation, AGE concludes that <br /> • Depth to ground water ranged from 6 87 feet to 7 91 feet below the tops of the well casings <br /> Ground water elevations at the site ranged from 28 91 feet above MSL in well MW-9 to <br /> 29 82 feet above MSL in well MW-11 <br /> Advanced GeoEnnronmental,Inc <br /> 1 <br />