EXH1182045402

Subgrade Improvement will be Needed for all Three Walls 2 Subgrade Improvement Alternatives 2 Special Embankment Fill is Required Below the MSE Walls 3 SUBGRADE IMPROVEMENTS NEEDED FOR STABILITY 4 WALL SETTLEMENTS WITH AND WITHOUT SUBGRADE IMPROVEMENTS 8 RECOMMENDED SUBGRADE IMPROVEMENT ALTERNATIVES 9 Overexcavation and Replacement with Structural Fill 9 Use of Stone Columns for Ground Improvement 1o THE USE OF THIS REPORT 12 FIGURES Vicinity Map Subgrade Improvement and Groundwater Control Plan North Safety Area Subgrade Improvement and Groundwater Control Plan West MSEWall Subgrade Improvement and Groundwater Control Plan South MSEWall Extent of Subgrade Improvement to Mitigate Liquefaction for a West Wall Section Fill Reinforcement to Mitigate Potential Failure Surface for a West Wall Section Stone Column Installation for Subgrade Improvement APPENDIX A STABILITY ANALYSES - DESIGN ASSUMPTIONS, CRITERIA, METHODS, AND INPUT SOIL PARAMETERS A-1 Design Assumptions A-1 Stability Criteria A-2 Methods Used in Analyses A-3 Input Soil Parameters A-4 AR 045403 Hart Crowser Page i J-4978-22 CONTENTS (Continued) Page TABLE A-I Summary of Input Soil Parameters A-4 APPENDIX B MSE WALL CROSS-SECTIONS B-] FIGURES B-1 North Safety Area MSE Wall, Section 101 + 20 B-2 North Safety Area MSE Wall, Cross Section 103 + 20 B-3 North Safetv Area MSE Wall, Section 105 + 20 B-4 North Safety Area MSE Wall, Section 107 + 19 B-5 North Safety Area MSE Wall, Section 110 + 47 B-6 North Safety Area MSE Wall, Section 114 + 10 B-7 West MSE Wall, Section 173 + 65 B-8 West MSE Wall, Section…

Open full document

Upcoming Events

PSCAA Advisory Council Meeting Agenda
Add to CalendarMWednesday Mar 11, 9:00am - 11:35am
1904 3rd Avenue, Suite 105, Seattle, WA 98101
Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]