TagEarthquake(16)

Two 2001 Seattle Post-Intelligencer articles raise safety and environmental concerns about SeaTac Airport's proposed third runway. The first warns that a planned 15-story, 1,450-foot retaining wall built on weak, earthquake-prone soils could catastrophically fail in a seismic event, threatening wetlands and salmon-bearing streams. The second reveals that state officials approved a key water-quality permit for the runway without following their own attorney's advice to secure a water right, prompting the Airport Communities Coalition to appeal the permit and allege political pressure was driving the project forward.

Draft memorandum dated March 5, 2001 from Douglas Lindquist E.I.T., Barry Chen PhD P.E., and Michael Bailey P.E. of Hart Crowser Inc. to Jim Thomson P.E. of HNTB, project J-4978-30. Presents revised methods and results of liquefaction analyses for the SeaTac Third Runway embankment, based on revised probabilistic seismic hazard analysis (PSHA) and one-dimensional site

Memorandum dated January 25, 2001 from Douglas Lindquist (EIT) and Michael Bailey (P.E.) of Hart Crowser, Inc. to the Embankment Technical Review Board (Attn: Pete Douglass), project J-4978-30, CC to Jim Thomson (P.E., HNTB). Provides additional information on seismic analyses for the Third Runway at Seattle-Tacoma International Airport (STIA) in SeaTac, Washington. Covers probabilistic seismic

Draft memorandum J-4978-28 from Hart Crowser (Douglas Lindquist, Barry Chen PhD P.E., Michael Bailey P.E.) to Jim Thomson P.E. at HNTB, dated September 7, 2000, presenting methods and results of liquefaction analyses for the proposed Third Runway embankment and retaining walls at Sea-Tac, Washington. Analyzed 120 borings with Standard Penetration Test (SPT) results from 112

Draft memorandum dated April 10, 2000 from Douglas Lindquist, Barry Chen P.E., and Mike Bailey P.E. of Hart Crowser, Inc. to Jim Thomson P.E. at HNTB regarding seismic basis of design for the Third Runway Project (J-4978-14) at Sea-Tac Airport for the Port of Seattle. Compares 475-year return period (0.36g peak acceleration, 10% probability of

Hart Crowser memorandum from Michael Bailey, Allen Jones, and Doug Lindquist to Jim Thomson (HNTB), dated October 8, 1999, presenting probabilistic seismic hazard analysis (PSHA) results for the Sea-Tac Airport Third Runway project (J-4978-14). Reports peak horizontal acceleration (PHA) values for common design return intervals: 0.16 g (72-year), 0.36 g (475-year), 0.47 g (975-year), and