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Table of Contents <br /> INTRODUCTION AND PROJECT DESCRIPTION 1 <br /> FIELD EXPLORATIONS AND LABORATORY TESTING 1 <br /> Field Explorations 1 <br /> Laboratory Testing 2 <br /> PREVIOUS STUDIES 2 <br /> SITE CONDITIONS 2 <br /> Setting 2 <br /> Geology 3 <br /> Surface Conditions 3 <br /> Pavement Conditions 3 <br /> Subsurface Soil and Groundwater Conditions 5 <br /> Canyon Park Park-and-Ride and SR 527 at 220th Street SE 5 <br /> SR 527 at SR 524 5 <br /> SR 527 at 196th Street SE 6 <br /> SR 527 at 180th Street SE 6 <br /> SR 527 at 164th Street SE 6 <br /> SR 527 at 153rd Street SE and SR 527 at Trillium Boulevard 7 <br /> 132nd Street SE at 16th Avenue SE 7 <br /> 132nd Street SE at Elgin Way/Dumas Road 7 <br /> 128th Street SE at 3rd Avenue SE 7 <br /> 128th Street SE widening at 1-5 8 <br /> 128th Street SW at 4th Avenue West 8 <br /> Airport Road/128th Street SW at East Gibson Road 9 <br /> Airport Road at SR 99 9 <br /> Airport Road at 112th Street SW and Airport Road at 100th Street SW 9 <br /> Airport Road at Kasch Park Road 9 <br /> Groundwater Conditions 10 <br /> CONCLUSIONS AND RECOMMENDATIONS 10 <br /> Summary of Geotechnical Considerations 10 <br /> Earthquake Engineering 10 <br /> Design Earthquake Parameters 10 <br /> Seismic Hazards 11 <br /> Station Retaining Walls 11 <br /> Anticipated Soil Conditions 11 <br /> Foundation Support and Subgrade Preparation 12 <br /> Design Parameters 12 <br /> Wall Drainage 13 <br /> Other Considerations 14 <br /> Wall 1 and 2 Cast-in-Place Walls 14 <br /> Wall Drainage 16 <br /> Wall 2 Soldier Pile Wall 16 <br /> Design Recommendations 16 <br /> GEOENGINEERS_ri April 14,2017 P Page i <br /> File No.2095-032-00 <br />