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S E C 0 R <br /> . REMEDIATION STATUS <br /> The ozone injection system consists of a panel mounted KVA C-SpargeTM System that <br /> produces 4 grams per hour (0 009 pounds per hour) of ozone The system Injects ozone <br /> to ten ozone wells SP-A through SP-H, SP-J, and SP-K The system began operation <br /> on December 20, 2001 During the current quarter, the system operated for 2,205 hours, <br /> resulting In approximately 98% run-time The system was found to be non-operational on <br /> November 30 and December 30, 2004, due to the ozone sensor being tripped It was y <br /> restarted both times Ozone injection system operational data is included as Table B-1 <br /> in Attachment B <br /> The performance of the ozone injection system is evaluated based on the results of <br /> routine groundwater sampling Monthly groundwater samples were collected from <br /> monitoring wells MW-3 and MW4 on October 28, November 30, and December 30, <br /> 2004, and analyzed for TPHg, BTEX, MtBE, and TBA Monthly sampling of wells MW-3 <br /> and MW-4 indicated that ozone sparging continues to be effective in reducing <br /> concentrations of dissolved petroleum hydrocarbons Results of monthly groundwater <br /> sampling events are summarized in Table B-2 Concentration versus time graphs for = <br /> dissolved TPHg, benzene, MtBE, and TBA in wells MW-3 and MW-4 are provided in ix <br /> Figures B-1 and B-2 Remediation field data sheets, certified laboratory analytical <br /> reports, and chain-of-custody documentation are provided in Attachment C <br /> CHARACTERIZATION STATUS <br /> • Contamination in soil has been adequately delineated Contamination in groundwater is <br /> not defined for MtBE and TBA <br /> RECENT SUBMITTALS I CORRESPONDENCE <br /> None <br /> THIS QUARTER ACTIVITIES (Fourth Quarter 2004) <br /> 1 Quarterly groundwater monitoring and sampling performed by TRC <br /> 2 SECOR prepared and submitted a quarterly report that documents on-going <br /> activities at the site, including quarterly sampling and remediation <br /> NEXT QUARTER ACTIVITIES (First Quarter 2005) r <br /> 1 SECOR will prepare and submit a quarterly report that documents on-going activities <br /> at the site, including quarterly sampling and remediation <br /> 2 Quarterly groundwater monitoring and sampling will be performed by TRC <br /> 3 SECOR will perform ozone sparge system operation and maintenance <br /> i 1ConocoPhdhps\Retad Sites1111921QSSM200414Q2004 QSSR doc <br />