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E C ® R <br /> 40 Based on the results of the third quarter 2004 data (both groundwater monitoring and remediation <br /> System operational data) ozone sparging continues to be effective in reducing petroleum <br /> hydrocarbon concentrations Dissolved MTBE and other hydrocarbon levels have declined over <br /> time since remediation system startup in 2002 (1 a as shown in Graph 1, Attachment A) <br /> SECOR recommends that the system continues operation a <br /> CHARACTERIZATION STATUS <br /> Contamination in soil and groundwater has been adequately delineated <br /> RECENT SUBMITTALS/CORRESPONDENCE <br /> Nine <br /> THIS QUARTER ACTIVITIES (Third Quarter 2004) <br /> 1 Performed quarterly groundwater monitoring and sampling (TRC) <br /> 2 Prepared and submitted a quarterly summary report <br /> 3 Performed remedial system O&M <br /> NEXT QUARTER ACTIVITIES (Fourth Quarter 2004) <br /> 1 Prepare and submit a quarterly summary report <br /> • 2 Perform quarterly groundwater monitoring and sampling <br /> 3 Perform remedial system O&M <br /> a <br />