EXH1312053230

FROM: BarryS. Chen, P.E.,and Michael Bailey,P.E., Hart Crowser, inc. RE: Stability Review of RECo 30% Design : ,.. Sea-TacThird Runway Embankment Project 4978-30 CC: JohnSankey,RECo Rob Miller, HNTB .:=-...,.,c: Hart Crowserhascompleted our review of the RECo30 percent design on the NSA, West, and South/viSEwallsof the SeaTacThird Runway Project. This lastpart of our review s=,,_ consistedof independent limit equilibrium analysesto verify stabilitysatisfiescritena in the AtLSHTOdesignprocedure. We calculated the factor of safety for steady state, end-of- construction,pseudo-static,and post-earthquakeliquefaction conditions for both global and compound failure modes. This memorandum providesour recommendations on changes of .:,:._.:., steelthicknessand embedment depth for some sections,based on the resultsof stability analyses. The limit equilibrium analyseswere basedon the RECo .30 percent design,and soil parametersas describedin Hart Crowser's memorandum "Ceotechnical Input to MSE Wall ..... Design." (An update to the August 22, 2000, draft of this memo is being submitted concurrentwith this memo). Hart Crowser alsouseda finite dih:erencecomputer program (FLAC)to model typicatMSE wall sect3onsto provide an independent assessmentof wall oer_orrnance,whichi._notre_uire_hv A,,-'SHTO.Resuits_,_._.p='_ACrncdelin_._re presentedseparately. Our analysesfollow RECo'sassumptionsin modeling the reinforcing stnp as indicated in the spreadsheetwe receiveo with their .30:)ercent desi_.n.This -_coroach enabled Hart Crr)w_er to. equally oiviclethe reinforcement densityinto D.vo"eouivaient" stnos for each paneJ. whlct_ ve apptied to a unit thicknessoi ] foot for use in the plain strainanalyses.We AR 053230 °. 1312 U HNTB 4978-30 january9.200"> Page 3 calculated the pullout length for each equivalentreinforcing strip based on the same criteria RECo usedin the internal stabilitydesign,indudin8 corrosion reducuon of the steel for the design life of the structure. The computer…

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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 [...]