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S CC ® R <br /> E � <br /> 19, and June 16, 2004 and analyzed for total petroleum hydrocarbons as gasoline (TPHg), r <br /> benzene, toluene, ethylbenzene, and total xylenes (BTEX compounds), and methyl tert-butyl <br /> ether (MtBE) Results of monthly groundwater sampling events are summarized in Table B-2 <br /> Concentration versus time graphs for dissolved TPHg, benzene, and MtBE in monitoring wells <br /> MW-16 and VW-7 are provided in Figures B-1 and B-2 <br /> Based on the results of the second quarter 2004 data (both groundwater monitoring and <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 2001 (1 a as shown in Figures B-1 and 13- <br /> 2, Attachment B) SECOR recommends that the system continues operation <br /> CHARACTERIZATION STATUS <br /> Contamination in soil and groundwater has been adequately delineated <br /> RECENT SUBMITTALSICORRESPONDENCE <br /> None <br /> THIS QUARTER ACTIVITIES (Second 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 (Third Quarter 2004) <br /> 1 Prepare and submit a quarterly summary report <br /> t <br /> 2 Perform quarterly groundwater monitoring and sampling <br /> 3 Perform remedial system O&M <br /> s <br />