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S E C ® R <br /> Y " <br /> .-r <br /> r <br /> monthly groundwater sampling events are summarized in Table 2 In addition to the <br /> monthly groundwater samples collected for laboratory analysis, SECOR also collected <br /> oxidation reduction potential (ORP) and dissolved oxygen (DO) measurements in <br /> monitoring wells MW-3 and MW-4 monthly The ORP and DO data are also included in r <br /> Table 2 <br /> Concentration versus time graphs for dissolved TBA, benzene, and MtBE for well MW-3, <br /> and for dissolved TPHg, benzene, MtBE, and TBA in well MW-4 are provided as Figure <br /> 1 and Figure 2, respectively Remediation system certified laboratory analytical reports <br /> and chain-of-custody documentation are provided in Attachment 3 <br /> r <br /> RECENT SUBMITTALS 1 CORRESPONDENCE <br /> None <br /> THIS QUARTER ACTIVITIES (First Quarter 2005) <br /> 1 Groundwater monitoring and sampling activities were performed by TRC <br /> 2 Continued operation, and performed monthly maintenance of the OS system <br /> NEXT QUARTER ACTIVITIES (Second Quarter 2005) <br /> 1 Groundwater monitoring and sampling event will be performed by SECOR <br /> 2 Continue operation and perform monthly maintenance of the on-site OS system <br /> 3 Prepare and submit a semi-annual remediation system evaluation report by June f <br /> 30, 2005 <br /> 4 Prepare a work plan for the installation of additional off-site wells to further <br /> delineate the extent of dissolved MtBE and TBA northeast of Shell wells S-5 and <br /> S-6 � <br /> LIMITATIONS <br /> This report presents our understanding of existing conditions at the subject site The <br /> conclusions contained herein are based on the analytical results, and professional <br /> judgment in accordance with current standards of professional practice, no other Y� <br /> warranty is expressed or implied SECOR assumes no responsibility for exploratory <br /> borings or data reported by other consultants or contractors <br /> Sincerely, <br /> SECOR International Incorporated �9?,pFES51 CNq ' <br /> �J C 58 9 m <br /> Elf <br /> EXP 1213112006 * �; <br /> Rusty Benkosky, <br /> Principal Engine s CIVIL <br /> l9T�OF CAI,_ <br /> E 1ConocoPhdlips\Retai1 Sites1111921QSSR1200511Q2005 QSSR and QRPS doc <br /> r <br />