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s TABLE OF CONTENTS INTRODUCTION..................................................................................................................................... 1 SITEDESCRIPTION................................................................................................................................ 1 PREVIOUS ENVIRONMENTAL WORK..............................................................................................Z SITECONCEPTUAL MODEL...............................................................................................................5 Former Vintage Car Wash 6 INTERIM REMEDIAL ACTION............................................................................................................6 System Installation 6 System Operation 7 Groundwater Sampling 7 Groundwater Sampling Results 7 TPHg - 7 Benzene g Discussion of Results g CONCLUSIONS AND RECOMMENDATIONS...................................................................................9 Ozone Microsparging 9 Additional Subsurface Assessment 10 Summary of Proposed Work 10 TABLES Table 1 Interim Remedial Action Test Groundwater Monitoring Data and Analytical Results Table 2 Wells U-1, U-2, and U-3 Historical Groundwater Monitoring Data and Analytical Results FIGURES Figure 1 Vicinity Map Figure 2 Site Plan Figure 3 Extended Site Plan Figure 4 Cross Section A-A' Figure 5 Cross Section B-B' Figure 6 Cross Section C-C' APPENDICES Appendix A SJCPHS-EHD and RWQCB Letters Appendix B Former Vintage Car Wash Soil and Groundwater Analytical Data Appendix C Historical TPHg and Benzene Groundwater Concentration Graphs Appendix D Interim Remedial Action Test TPHg and Benzene Groundwater Concentration Graphs Appendix E Historical Quarterly Groundwater Monitoring and Sampling Data Appendix F Chemical Analytical Reports and Chain of Custody Forms