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TABLE OF CONTENTS <br />EXECUTIVE SUMMARY.... <br />FMS #24 Site Investigation Report <br />California Army National Guard <br />Page <br />....... 1 <br />1.0 SITE DESCRIPTION...................................................................................................................... 2 <br />1.1 Site Location....................................................................................................................... 2 <br />1.2 Installation Description and History................................................................................... 2 <br />1.3 Physiographic Setting and Geology.................................................................................... 2 <br />1.4 Geology...............................................................................................................................2 <br />2.0 AREAS OF POTENTIAL ENVIRONMENTAL CONCERN........................................................ 3 <br />3.0 NATURE AND EXTENT OF CONTAMINATION...................................................................... 3 <br />3.1 Previous Investigations....................................................................................................... 3 <br />3.2 Versar, Inc., 2004 Site Investigation.................................................................................. 3 <br />3.3 URS May 2007 Site Investigation...................................................................................... 5 <br />3.4 URS October 2007 Site Investigation................................................................................. 6 <br />3.5 Evaluation of Potential Health Risks from Vapor Intrusion ............................................... 7 <br />3.6 Contaminant Migration Potential....................................................................................... 8 <br />4.0 CONCLUSIONS..............................................................................................................................9 <br />5.0 RECOMMENDATIONS................................................................................................................. 9 <br />6.0 REFERENCES................................................................................................................................ 9 <br />APPENDIX A: Figures <br />APPENDIX B: Tables <br />APPENDIX C: Boring Logs <br />APPENDIX D: Analytical Data from 2007 URS Investigations <br />i December 2007 <br />