EXH1211046304

RE: Stability Review of RECo 30% Design Third Runway Embankment Project ch,_ago J-4978-30 CC: Mike Bailey, Hart Crowser John Sankey, RECo Denver Pete Douglas Provided herein is a summary of Hart Crowser's review analyses on RECo's 30% design for NSA, West, and South MSE Walls. The majority of the information was presented in our Fa,rOan_s 30% design review meeting dated September 28, 2000. We also included results of our follow-up analyses for verification of proposed design modifications. At the request of Pete Douglas, we are sending this package to the members of the Technical Review Board in preparation for the first review meetings on November 16 to 18, 2000. Jersey City Prior to RECo's30% design, Hart Crowser completed a seriesof preliminary limit equilibrium analysesfor NSA, West, and South MSE Walls for the purpose of defining the need and extent of subgrade improvement beneath the walls. Our general approach in reviewing RECo'sdesign is to identify the most critical design sections by examining the Juneau proposed wall height, embedment depth, and strip length for each section. Using the computer program SLOPE/W, global and compound stability were examined by limit equilibrium methods. We used the target factor of safety values discussed in Hart Crowser's June 2000 report as preliminary stability analyses for the MSE walls. For sections indicating Long Beach marginal factors of safety, a displacement-based computer program FLAC was used to evaluate potential deformations. In general, we found satisfactory factors of safety for all the North Wall sections reviewed. We found marginal…

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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 [...]