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S tEC ® R <br /> Remediation System Effectiveness <br /> The area of well MW-3 and nearby well MW-7, immediately north of the former UST <br /> complex, has reportedly contained the highest concentrations of petroleum <br /> hydrocarbons, MtBE, and TBA impacts beneath the site Review of quarterly <br /> groundwater monitoring results and historical monthly groundwater analytical results forM1; <br /> well MW-3, and quarterly monitoring results for well MW-7 since the start-up of the OS <br /> system by GRI in December 2002, indicate significant decreases in MtBE concentrations <br /> to non-detectable concentrations above laboratory MRLs, and decreasing TBA <br /> concentration trends in the wells Both of these wells continue to report elevated <br /> concentrations of TBA Decreasing TBA and/or MtBE concentration trends have been <br /> observed in other wells located in the vicinity of the OS wells (MW-1, MW-4 through <br /> MW-6, MW-12, and MW-13) A concentration versus time graphs for wells MW-3 and <br /> MW-4 is provided as Figures 2 and 3, respectively Remediation system certified 4 <br /> laboratory analytical reports and chain-of-custody documentation are provided in 3 <br /> Attachment 3 <br /> RECENT SUBMITTALS /CORRESPONDENCE <br /> None <br /> THIS QUARTER ACTIVITIES (Second Quarter 2005) <br /> t <br /> 1 SECOR submitted the Quarterly Monitoring and Remedial Performance <br /> Summary Report-- First Quarter 2005 on April 29, 2005 <br /> { 2 Groundwater monitoring and sampling activities were performed by TRC on May <br /> 27, 2005 <br /> 3 Continued operation, and performed monthly maintenance of the OS system J <br /> NEXT QUARTER ACTIVITIES (Third Quarter 2005) w <br /> 1 Groundwater monitoring and sampling event will be performed by TRC <br /> 2 Continue operation and perform monthly maintenance of the on-site OS system <br /> 3 Prepare a work plan for additional vertical and lateral delineation of dissolved fuel ; <br /> oxygenate Impacts beneath and in the vicinity of the site <br /> w <br /> J4, <br /> Y <br /> µµA <br /> a <br /> w <br /> o- <br /> a <br /> rg <br /> r� <br /> Y 1J <br /> I IConocoPhdhps\Retatl Sitesl111921QSSR1200512Q2005 QSSR and QRPS doe x{ <br /> �9� <br />