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Geotechnical Engineering Report lierracon <br /> Staples Rockery Failure • Everett,Washington <br /> March 8, 2019 •Terracon Project No. 81175122 <br /> Page <br /> EXECUTIVE SUMMARY III <br /> 1.0 INTRODUCTION 1 <br /> 2.0 PROJECT INFORMATION 1 <br /> 2.1 Site Location and Description 1 <br /> 2.2 Project Description 2 <br /> 3.0 SUBSURFACE CONDITIONS 3 <br /> 3.1 Geology 3 <br /> 3.2 Typical Profile 3 <br /> 3.3 Groundwater 4 <br /> 3.4 Rockery Failure 4 <br /> 3.5 Perceived Risks of Existing Southern Portion of Rockery 5 <br /> 4.0 RECOMMENDATIONS FOR DESIGN AND CONSTRUCTION 5 <br /> 4.1 Geotechnical Considerations 5 <br /> 4.2 Earthwork 6 <br /> 4.2.1 Site Preparation 6 <br /> 4.2.2 Temporary Cut Slopes 7 <br /> 4.2.3 Material Requirements 7 <br /> 4.2.4 Compaction Requirements 8 <br /> 4.2.5 Grading and Drainage 8 <br /> 4.2.6 Construction Considerations 8 <br /> 4.3 Seismic Considerations 9 <br /> 4.4 Lateral Earth Pressures 10 <br /> 4.5 Retaining Walls 11 <br /> 4.5.1 Soldier Piles 11 <br /> 4.5.2 Tiebacks 12 <br /> 4.5.3 Lagging 12 <br /> 4.5.4 Drainage and Permanent Facing 13 <br /> 4.5.5 Retaining Wall Construction 13 <br /> 4.5.6 Monitoring 13 <br /> 5.0 GENERAL COMMENTS 14 <br /> APPENDIX A— FIELD EXPLORATION <br /> Exhibit A-1 Site Location Map <br /> Exhibit A-2 Site and Exploration Plan <br /> Exhibit A-3 Field Exploration Description <br /> Exhibit A-4 Boring Log B-1 <br /> Exhibit A-5 Photographs of Surface Conditions <br /> Responsive • Resourceful • Reliable <br />