8407 BROADWAY SECURE SPACE STORAGE 2025-08-19

TABLE OF CONTENTS INTRODUCTION.............................................................................................................................................1 SITE DESCRIPTION.........................................................................................................................................1 PROJECT UNDERSTANDING ..........................................................................................................................1 SURFACE CONDITIONS..................................................................................................................................1 SUBSURFACE CONDITIONS ...........................................................................................................................2 PublishedGeologic Mapping ....................................................................................................................2 SubsurfaceSoil Conditions........................................................................................................................3 GroundwaterConditions ..........................................................................................................................3 Summary of Laboratory Testing................................................................................................................3 CONCLUSIONS AND RECOMMENDATIONS...................................................................................................4 General Considerations.............................................................................................................................4 GeologicallyHazard Areas ........................................................................................................................4 IBC Seismic Site Class Definition ...............................................................................................................5 SitePreparation ........................................................................................................................................6 Structural Fill Materials and Placement....................................................................................................7 Utility Trenching and Backfilling ...............................................................................................................9 Temporary and Permanent Slopes .........................................................................................................10 ConstructionDewatering........................................................................................................................11 Building Foundation Recommendations.................................................................................................11 On-Grade Concrete Slabs........................................................................................................................14 BackfilledRetaining Walls.......................................................................................................................15 Drainage Considerations.........................................................................................................................16 CLOSURE .....................................................................................................................................................16 FIGURES Figure 1—Site and Exploration Plan Figure 2— Building Foundation Recommendations Graphical Depictions APPENDICES Appendix A—Subsurface Exploration Procedures and Logs Appendix B—Laboratory Testing Procedures and Results Cover Photo Reference:Google Earth,2015