EXH1201046005

FROM: Douglas Lindquist, E.I.T., Barry Chen PhD. P.E., and Michael Bailey, P.E., Hart Crowser, Inc. Chicago RE: Methods and Results of Liquefaction Analyses Third Runway Embankment Sea-Tac, Washington J-4978-28 Denver This memorandum presents the methods and results of Hart Crowser's analysis of potential liquefaction and post-liquefaction residual strength for the proposed Third Runway embankment and retaining walls. We analyzed a total of 120 borings and their Fo,r_._nk_ corresponding Standard Penetration Test (SPT) results. Logs of these borings can be found in previous subsurface conditions data reports (references are listed at the end of this memorandum, (see Civil Tech, 1997, Hart Crowser, 1999a, 2000a, 2000b, 2000c, and 2000e for information on subsurface conditions). See Hart Crowser's report entitled Jersey Citl "Geotechnical Engineering Report, 404 Permit Support" for an overview of the project (Hart Crowser, 1999b). Potential for liquefaction, and resulting soil behavior is influenced by a number of factors. This memorandum is intended to document the approach used by Hart Crowser in Ju,,oau determining which areas of the Third Runway embankment site are susceptible to liquefaction. Results of the analysis presented in this memorandum were used in separate design analyses that are discussed in companion reports, (see for instance Hart Crowser, 2000d and 20000. _......_e.,_, SUMMARY The liquefaction potential was evaluated for the overall site as well as separately at the NSA Port_n_ Wall, West Wall, South Wall, and the 2H:IV slope area between the NSA Wall and West Wall. The advantage of looking at the site as a whole is…

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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 [...]