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L` <br /> the other constituents were reported well below their respective MCLS. MTBE was detected in <br /> the groundwater samples collected from wells MW-1 through MW-5. Only the groundwater <br /> sample collected from well MW-2 contained MTBE at a concentration that exceeded the MCL of <br /> 5.0 micrograms per liter (µg/1). Groundwater analytical results are summarized in Table 2. The <br /> laboratory analytical reports are included in Appendix B. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The laboratory analytical results of the groundwater samples collected on August 24, 2004, are <br /> generally consistent with recent historical results. The concentrations of COCs detected in the <br /> sample collected from MW-2 generally increased with respect to the previous sampling event. <br /> The concentrations of petroleum hydrocarbon constituents detected in the sample collected from <br /> MW-3 decreased with respect to the previous sampling event. The groundwater elevation has <br /> increased on an average of 0.49 feet, which could explain the change in concentrations. The <br /> groundwater gradient direction is consistent with previous sampling events. <br /> If you have any questions or comments regarding this matter please contact our office at (209) <br /> 579-2221. <br /> Respectfully submitted *fv -�»te,a�. <br /> a` I S <br /> ATC Associates Inc. X41F. VV <br /> Y, dey.Gnly�xlstgSy t <br /> ?Jan"ne Homsey, P.E. <br /> CA Registered Civil Engineer No. 47410 . <br /> 'ty4..'.➢'?."�Tf�`�„Y,1ti.7�Yw �'tid��a' <br /> cc: Dr. A.R. Glover <br /> Mr. Jim Barton, RWQCB <br /> Attachments: Table 1, Summary of Groundwater Monitoring Data <br /> Table 2, Summary of Analytical Results-Groundwater <br /> Figure 1, Site Vicinity Map <br /> Figure 2, Groundwater Gradient Map <br /> Appendix A, Groundwater Well Purge and Sample Logs <br /> Appendix B,,Laboratory Analytical Results <br /> s:\Environmentalll7861\reports\1gmr2004.doc 4 ATC Associates Inc. <br />