EXH0404021830

ATI_: Muffy Walker/Gall Terzi • JO_ 2 6 2001 Washington State Departmentof Ecology U_OE , ShorelandsandEnvironmentalAssistanceProgram REGULATORYBRANCH 3190 - 160th Ave. SE Bellevue, WA 98008 ATTN: Ann Kenny, EnvironmentalSpecialist Subject: Response to the Portof Seattle's comments on the GeoSyntec Comultants letterof 16February2001 OeoSyntec Comultants (GeoSyntec) has been retained on behalf of the Airport ._, CommunitiesCoalition to providea technicalreview of investigation,analysisand design relatingto constructionof the embankmentfig and West MechanicallyStabilized Earth (MSE) Wall elements of the proposedThird Runway Expansion Projectat the Seattle Tacoma InternationalAirport. This lettersummarizesGeoSyntec's responseto the Portof Seattle's comments contained in their April30, 2001 response to GeoSyntec's February 16, 2001 letter. GcoSyntec is highly qualified to perform this review. OeoSyntec's personn'.elin charge of the review include Patrick C. Lucia, Ph.D., P.E., G.E., and Edwa/d' ' KavaTanjian,Jr., Ph.D., P.E., G.E. Introduction The size and scope of the proposed West MSE wall is extending the state of practice for this type of design and construction. National building codes relied upon by the Portas a basis for preliminarydesign are typically intendedas minimum design standards and are not applicable for a project such as the proposed MSE wall. The performance of smaller walls subjected to lower intensity seismic loading than the IAWRO3$O_SubmittatXGcoSyntccResponsetoPort.doc __O _1 RegionalOffk_ _W__ Labetltecks: Atlanta,GA •Austin,TX, BocaRat_, Ft. • Chicago,IL Alphatetta,GA*Atlaa_ GA Columbia,MD- HuntingtonBeach,CA• WalnutCre¢_CA BocaRatoa.FL AR 021830 G_oSvsw,c Coemaxs_-rs Walker/Terzi/Kenny June 2001 Page 2 design standards for the West MSE Wall may be consider_ encouraging, but is not sufficient evidence to allow for less than the most rigorousstandards for the…

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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 [...]