EXH1235049946

FROM: Douglas Lindquist, E.I.T., Barry Chen, PhD., P.E., and Michael Bailey, P.E., Hart Crowser, Inc. - RE: Revised Methods and Results of Liquefaction Analyses ch,c_go Third Runway Embankment SeaoTac,Washington J-4978-30 Denver This memorandum provides results of liquefaction analyses for the SeaTac Third Runway project. Preliminary liquefaction analyses were presented in our September 7, 2000 draft memorandum. This update is based upon the results from the revised probabilistic seismic Falrbanks hazard analysis (PSHA) and one-dimensional site response analyses. The site response analyses were performed for proposed embankment heights of 50 and 150 feet above the existing ground surface. See Hart Crowser's memorandum entitled "Additional Information on the Seismic Design" (Hart Crowser, 2001 ) for additional information on these aqalyses. Jer',eV City This memorandum presents the methods and results of Hart Crowser's analyses of potential liquefaction and post-liquefaction residual strength for the proposed Third Runway embankment and retaining walls. Results of both the preliminary and revised analyses are presented. We analyzed a total of 120 borings and their corresponding Standard Joneau Penetration Test (SPT) results. Logs of these borings are presented in previous subsurface conditions data reports (references are listed at the end of this memorandum, (see Civil Tech, 1997 and Hart Crowser, 1999a, 2000a, 2000b, 2000c, and 2000e for information on subsurface conditions). See Hart Crowser's report entitled "Geotechnical Engineering Lorrq Beach 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…

Open full document

Upcoming Events

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 [...]