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<br />Geotechnical Engineering Report i HWA GEOSCIENCES INC. <br />Port Gardner Storage Facility <br />TABLE OF CONTENTS <br />1.0 INTRODUCTION ........................................................................................................1 <br />1.1 GENERAL ...................................................................................................................1 <br />1.2 PROJECT UNDERSTANDING ........................................................................................1 <br />1.3 SEISMIC DESIGN APPROACH ......................................................................................2 <br />2.0 FIELD INVESTIGATION AND LABORATORY TESTING ..............................................2 <br />2.1 GEOTECHNICAL SUBSURFACE EXPLORATIONS ..........................................................2 <br />2.2 GEOTECHNICAL LABORATORY TESTING PROGRAM ...................................................4 <br />2.3 2022 ENVIRONMENTAL SAMPLING ............................................................................4 <br />2.4 2023 LIMITED ENVIRONMENTAL TESTING.................................................................5 <br />2.5 PREVIOUS EXPLORATIONS BY OTHERS ......................................................................6 <br />3.0 SITE CONDITIONS .....................................................................................................7 <br />3.1 SURFACE CONDITIONS ...............................................................................................7 <br />3.2 SITE GEOLOGY ..........................................................................................................7 <br />3.3 SUBSURFACE CONDITIONS.........................................................................................8 <br />3.4 GROUNDWATER CONDITIONS ....................................................................................8 <br />3.5 AQUIFER PUMP TESTING ...........................................................................................10 <br />3.6 ENVIRONMENTAL SAMPLING .....................................................................................10 <br />3.6.1 Analytical Results for Soil Samples ...............................................................10 <br />3.6.2 Analytical Results for Groundwater Samples ................................................11 <br />4.0 CONCLUSIONS AND RECOMMENDATIONS ...............................................................12 <br />4.1 GENERAL ...................................................................................................................12 <br />4.2 SEISMIC DESIGN CRITERIA ........................................................................................14 <br />4.2.1 Near-Fault Effects ..........................................................................................16 <br />4.2.2 Liquefaction ...................................................................................................16 <br />4.2.3 Post-Liquefaction Residual Shear Strength ...................................................17 <br />4.2.4 Liquefaction-Induced Settlement and Down Drag Loading ..........................17 <br />4.2.5 Liquefaction-Induced Slope Instability ..........................................................17 <br />4.3 LIMIT EQUILIBRIUM GLOBAL SLOPE STABILITY EVALUATION ..................................18 <br />4.3.1 Static Condition Limit Equilibrium Analyses ................................................19 <br />4.3.2 Pseudo-Static Condition Limit Equilibrium Analyses ...................................19 <br />4.3.3 Post-Liquefaction Condition Limit Equilibrium Analyses ............................20 <br />4.4 MITIGATION OPTIONS FOR SLOPE INSTABILITY .........................................................20 <br />4.4.1 Ground Improvement Methods ......................................................................21 <br />4.4.2 Ground Improvement Design and Construction ............................................24 <br />4.5 FOUNDATION OPTIONS ..............................................................................................26 <br />4.6 DRIVEN PILE AND DRILLED MICROPILE FOUNDATION RECOMMENDATIONS .............28 <br />4.6.1 Vertical Axial Capacity ..................................................................................28 <br />4.6.2 Down Drag Loading on Vertical Piles ...........................................................31 <br />4.6.3 Uplift Capacity ...............................................................................................33