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CAMBRIA <br /> detected in well MW-12 at respective concentrations of 39 and 10 ppb 1,2-DCA was detected in <br /> samples collected from wells MW4, MW-12, and MW-13 at concentrations ranging from 15 to <br /> 53 ppb <br /> The groundwater analytical data are summarized in the well concentrations table in Blaine's <br /> report (Appendix C) Benzene and MTBE results are presented on Figure 3 The certified <br /> analytical report is also included in Blaine's report (Appendix C) <br /> CONCLUSIONS <br /> Cambria installed one shallow offsite well (MW-12) in the parking lot east of the site and one <br /> deep onsite well (MW-13) Soil results indicate that subsurface soil to the east of the existing <br /> UST complex is not impacted by TPHg,BTEX, or fuel oxygenates <br /> The highest concentrations of gasoline constituents in groundwater occur in samples collected <br /> from well VEW-2 located in the former UST pit Groundwater analytical results indicate that <br /> gasoline constituents are defined by onsite wells MW-1, MW-2, MW-3, and MW-5 (except for a <br /> • low benzene concentration in upgradient well MW-5), and low concentrations of MTBE and <br /> oxygenates are present in wells east of the existing USTs The TPHg concentrations in samples <br /> collected from wells MW-6 and MW-8 through MW-1I do not match the laboratories gasoline <br /> standard and are likely due to the presence of PCE in these wells <br /> RECOMMENDATIONS <br /> • Continue quarterly monitoring in shallow and deep zones <br /> • Discontinue sampling wells MW-6, MW-7, and MW-9 through MW-11 Cambria first <br /> proposed these sampling reductions in our First Quarter 2003 Groundwater Monitoring <br /> Report and Sample Frequency Reduction Request dated July 1, 2003 Since then, four <br /> additional groundwater sampling events have occurred Because well MW-8 contains <br /> se,veral compounds including low concentiations of INITBE, Combria withdraws our request <br /> to discontinue sampling MW-8 at this time We would like to implement these reductions <br /> beginning with the second quarter 2004 event and will verbally notify SCJEHD before <br /> sampling <br /> • Cambria will proceed with the approved dual phase and soil vapor extraction test in wells <br /> VEW-1 and VEW-2 to reduce source concentrations in the former UST area <br /> 0954 7 <br />