9 <br />GeoPacific <br />Real-World Geotechnical Solutions <br />Investigation • Design • Construction Support <br />TABLE OF CONTENTS <br />List of Appendices <br />List of Figures <br />PROJECT INFORMATION <br />.....................................1 <br />SITE AND PROJECT DESCRIPTION <br />.....................................1 <br />REGIONAL GEOLOGIC SETTING <br />.....................................2 <br />REGIONAL SEISMIC SETTING <br />.....................................2 <br />Cascadia Subduction Zone <br />.....................................2 <br />FIELD EXPLORATION AND SUBSURFACE CONDITIONS <br />.....................................3 <br />Soils <br />.....................................3 <br />Groundwater and Soil Moisture <br />.....................................4 <br />PRELIMINARY CONCLUSIONS AND RECOMMENDATIONS <br />.....................................4 <br />Site Preparation Recommendations <br />.....................................5 <br />Engineered Fill <br />.....................................6 <br />Excavating Conditions and Utility Trench Backfill <br />.....................................6 <br />Erosion Control Considerations <br />.....................................7 <br />Wet Weather Earthwork <br />.....................................7 <br />Preliminary Recommendations for Structural Foundations <br />.....................................8 <br />Concrete Slabs-on-Grade <br />...................................10 <br />Permanent Below-Grade Walls <br />...................................10 <br />Drainage <br />...................................12 <br />Flexible Pavement Design: Private Drive and Parking Lot <br />...................................12 <br />Wet Weather Construction Pavement Section <br />...................................14 <br />Seismic Design and Soil Liquefaction <br />...................................15 <br />UNCERTAINTIES AND LIMITATIONS <br />...................................17 <br />REFERENCES <br />...................................18 <br />APPENDIX <br />18-4986, 177 Day Island Road GRPT GEOPACIFIC ENGINEERING, INC. <br />Version 1, August 27, 2018 <br />