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KLEINFELDER <br /> i <br /> 3 CONCLUSIONS AND RECOMMENDATIONS <br /> The pilot testing of deep air sparging at the Disco Site indicate that the technology could be <br /> successfully applied to remediate contaminants of concern in the subsurface. The nested pilot <br /> sparge well indicated a radius of influence of approximately 43 feet in the shallow well and <br /> approximately 64 feet in the deep well. <br /> I <br /> Dissolved oxygen concentrations 65 feet from the sparge well increased by over 30% after four <br /> f hours of air sparging. Based on the estimated radius of influence and the calculated volume of <br /> groundwater, the test sparge well delivered roughly I mg of oxygen per liter of groundwater over <br /> four hours. <br /> Sampling of MW-1 indicated an increase in dissolved COCs during pilot testing. Kleinfelder <br /> speculates that the increase is indicative of elevated dissolved contamination below the screened <br /> interval of MW-I being mobilized by the deep air sparging. <br /> Sampling of soil gas in the pilot SVE well indicated the vadose concentration of TPH as gasoline <br /> in the vicinity of the Disco Site is approximately 96 µg/l. If an SVE system were implemented <br /> and run at 250 scfm, this would present a calculated treatment loading of about 2 pounds per day <br /> of TPH. <br /> Based on the findings of this pilot test, Kleinfelder recommends developing a Corrective Action <br /> Plan for the site evaluating a full-scale implementation of air sparging with soil vapor extraction <br /> technology. Kleinfelder also recommends evaluating supplementing the sparging technology <br /> with ozone utilizing empirical data from this test and published literature outlining procedures <br /> for remediation with ozone. <br /> f <br /> 1 <br /> r <br /> l 122801SAC2R566 Page 8 of 9 November 25,2002 <br /> + Copyright 2002 Kleinfelder,Inc. <br /> I <br /> I <br />