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EXH AR024994: Geotechnical Aspects Feb 28 2001 Nisqually Earthquake — Earth Structures Olympia South Seattle Tacoma WA

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This document examines the geotechnical effects of the February 28, 2001 Nisqually earthquake on earth structures in the Olympia, South Seattle, and Tacoma, Washington area. It covers damage observations including landslides along Highway 101, failures of road and railroad embankments, performance of mechanically stabilized earth retaining walls, and the condition of solid waste landfills following the quake. One notable slide near the State Road 8 junction involved a 15-20 meter high embankment that collapsed and sent debris flowing approximately 150 meters downslope.

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Administrative Record exhibit AR024994, archived from peer.berkeley.edu (PEER — Pacific Earthquake Engineering Research Center), documenting geotechnical observations from the February 28, 2001, Nisqually Earthquake. Covers performance of earth structures including earth embankments (Highway 101 landslide near State Road 8 junction, Martin Way Eastern Olympia road embankment, Railroad Embankment North of 4th Ave. Olympia, Chambers Bay), Mechanically Stabilized Earth (MSE) retaining walls (Extended Stay America at Highway 101 Tumwater, Costco MSE Wall Tacoma), and solid waste landfills (Kent Landfill, Midway Landfill). The Highway 101 embankment — approximately 15–20 m high with 1.5H:1V side slopes and a 1 m diameter corrugated metal culvert — failed, with debris flowing 150 m downslope. GPS coordinates N47.05834 W123.01365 recorded 03/03/01. Filed in PCHB Third Runway EIS administrative record.

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