EXH1301052350

This report describesthe engineering process used to address design issues related to soil conditions, groundwater, and potential earthquakes for the proposed Third Runway at SeatlJe-Tacoma International Airport (STIA). Overall, the runway project will include placement of 17,000,000 cubic yards of compacted fill, 3,000,000 cubic yards of excavation, and construction of three "mechanically stabilized earth" (MSE) retaining walls that range from 50 to 135 feet in maximum heighL The executive summary of this report describes its purpose, general contents of the report, and results of the engineering analysis. A key part of the work described herein has been the involvement of an independent technical review board composed of distinguished experts to provide input into the geotechnical design process. The main part of this report summarizes the geotechnical data collection and engineering analysesaccomplished over a multi-year period by the Port of Seattle. The Seattle District, US Army Corps of Engineers (Corps) requested this executive summary as part of its review of the Third Runway Project. Scope and Purpose of This Report The scope of this report is to address the following: • Introduce the reader to the design team and explain what each firm's role has been, including the involvement of outside reviewers; • Describe the main features of the embankment and MSE retaining walls that are addressed in this report; • Summarize information that has been collected on soil and groundwater conditions at the Third Runway site; • Generally describe how the Port has studied the risk posed by earthquakes, and…

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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 [...]