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S E C ® R <br /> Based on the results of the fourth quarter 2004 data both groundwater monitoring and <br /> ( 9 9 <br /> remediation system operational data) ozone sparging continues to be effective in reducing <br /> petroleum hydrocarbon concentrations Dissolved MTBE and other hydrocarbon levels have <br /> declined over time since remediation system startup in 2002 (1 a as shown in Graph 1, <br /> Attachment A) SECOR recommends that the system continues operation <br /> CHARACTERIZATION STATUS <br /> Contamination in soil and groundwater has been adequately delineated <br /> RECENT SUBMITTALS/CORRESPONDENCE <br /> None <br /> THIS QUARTER ACTIVITIES (Fourth 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 (First Quarter 2005) <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 />