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' Groundwater-quality Monitoring—March 29-31,2006, 7500 West Eleventh Street, Tracy, CA. Page ii Report: Group q y g 7.3 Optimal Groundwater Monitoring Frequency....................................................................25 7.4 Potable Water-quality Monitoring Program.......................................................................26 8.0 RECOMMENDATIONS.... ..........................................................27 8.1 Groundwater-quality Monitoring Program.........................................................................27 8.2 Closure of Redundant Wells........................ ...............---.......29 .............................................. 8.3 Monitoring and Management of Light Non-aqueous Phase Liquid...................................29 8.4 Potable Water-quality Monitoring Program.......................................................................30 9.0 REFERENCES TABLES Table 1: Depths to Groundwater Table 2: Results of Analyses of Samples of Groundwater Table 3: Thickness of Floating Product in Selected Monitoring Wells Table 4: Results of Analyses of Samples from Potable Water Wells FIGURES Figure 1: Site Location Figure 2: Groundwater Contours—March 29, 2006 Figure 3- Plume of Affected Groundwater Figure 4: Affected Soil in Cross Section A-A' Figure 5: Affected Soil in Cross Section B-B' Figure 6: Affected Soil in Cross Section C-C' Figure 7: Affected Soil in Cross Section D-D' Figure 8: Affected Soil in Cross Section E-E' Figure 9, Affected Soil in Cross Section F-F' Figure 10: Log,, Concentration of TPHg vs. Time at MW-3 Figure 11: Log„ Concentration of TPHd vs. Time at MW-3 Figure 12: Log,, Concentration of BTEX vs. Time at MW-3 Figure 13: Log,, Concentration of MTBE vs. Time at MW-3 y Figure 14: Log, TPHd and GW Elevation vs. Time at MW-3 APPENDICES APPENDIX A: MAROS Monitoring g p Program Optimization APPENDIX B: Field Notes APPENDIX C: Laboratory Certificates of Analysis sic