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ENGEO <br /> INCORPORATED <br /> <br /> <br />5150.100.101 <br />May 2, 2008 <br />TABLE OF CONTENTS <br />1. INTRODUCTION................................................................................................................1 <br />1.1 SCOPE OF SERVICES .........................................................................................................1 <br />2. PROJECT LOCATION ......................................................................................................1 <br />3. PROJECT DESCRIPTION ................................................................................................2 <br />4. FINDINGS ............................................................................................................................3 <br />4.1 REGIONAL GEOLOGY.......................................................................................................3 <br />4.2 SEISMIC SETTING ..............................................................................................................3 <br />4.3 SUBSURFACE CONDITIONS.............................................................................................4 <br />4.4 GROUNDWATER CONDITIONS.......................................................................................5 <br />4.5 LABORATORY TESTING...................................................................................................5 <br />5. CONCLUSIONS...................................................................................................................6 <br />5.1 EXPANSIVE SOIL................................................................................................................6 <br />5.2 EXCAVATABILITY.............................................................................................................6 <br />5.3 STATIC AND PERCHED GROUNDWATER.....................................................................7 <br />5.4 SEISMIC HAZARDS............................................................................................................7 <br />5.4.1 Ground Rupture...............................................................................................................8 <br />5.4.2 Ground Shaking...............................................................................................................8 <br />5.4.3 2007 CBC Seismic Design Parameters...........................................................................9 <br />5.4.4 Seismically Induced Landsliding ....................................................................................9 <br />5.4.5 Liquefaction...................................................................................................................10 <br />5.4.6 Lurching ........................................................................................................................10 <br />5.4.7 Densification Due to Earthquake Shaking ....................................................................10 <br />5.4.8 Lateral Spreading...........................................................................................................11 <br />5.5 SOIL CORROSION POTENTIAL......................................................................................11 <br />6. EARTHWORK RECOMMENDATIONS.......................................................................11 <br />6.1 EXPANSIVE SOIL MITIGATION.....................................................................................12 <br />6.2 BUILDING PAD PREPARATION.....................................................................................12 <br />6.3 GENERAL SITE CLEARING.............................................................................................13 <br />6.4 OVER-OPTIMUM SOIL MOISTURE CONDITIONS......................................................13 <br />6.5 ACCEPTABLE FILL...........................................................................................................14 <br />6.6 FILL COMPACTION..........................................................................................................14 <br />6.6.1 Grading in Structural Areas.....................................................................................14 <br />6.6.2 Underground Utility Backfill...................................................................................15 <br />6.6.2.1 General..............................................................................................................15 <br />6.6.2.2 Structural Areas................................................................................................15