EXH1239050017

TO: Port of Seattle, attn. Michael J. Cheyne FROM: Michael Bailey, P.E. RE: MSE Wall Performance During Earthquake ch,c_o J-4978-19 CC: HNTB,attn.Mr. JimThomson,P.E. Denver Per our discussion this morning here is a summary of our research on the two MSE walls that are noted by Helsell Fetterman (Eglick & Stock, 3/20/01) and GeoSyntec (3/15/01 ) as Fairbanks having had problems during the February 28 Nisqually earthquake. "! Basically Eglick & Stock and GeoSyntec claim that because the recent earthquake caused significant or extensive damage to these two walls, the Corps should carefully scrutinize structural integrity of the Port's proposed wall. GeoSyntec further raise a number of JerseyCity technical questions (mostly the same as already raised in their original 2/16/01 letter) that we are working on responses to. The 2 MSE walls identified as having "problems" are discussed below, s_neau Summary: 9 to 12-foot High Wall in Tumwater This MSE wall failed by collapsing during or possibly shortly after the earthquake, and was shown on a number of photos taken by Shannon & Wilson, a local consulting tongBeach engineer who was doing regional post earthquake damage assessment. Details are scarce because there is reportedly pending litigation, but the following information summarized below was compiled from post earthquake survey notes posted on the web and an email from Shannon & Wilson to Hart Crowser and a member of the Port's ETRB. Portland In summary: 1) The failed wall was not a RECo wall although it was designed using similar principals. Seattle 1970…

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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 [...]