This engineering cross-section diagram from Sea-Tac International Airport illustrates the dramatic 179-foot elevation drop adjacent to the proposed Third Runway, showing how a massive retaining wall and new embankment would be constructed alongside Miller Creek. The exhibit depicts key infrastructure features including a permanent chain-link security fence, rock underdrain, silt fence, inner collection swale, and a minimum 50-foot creek buffer zone designed to protect the existing waterway. The drawing is part of the Miller Creek Instream and Buffer Enhancements project documentation associated with the Third Runway expansion.Open full document
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A cross-sectional engineering diagram showing the stream buffer and embankment cross-section adjacent to the Third Runway at Sea-Tac International Airport. The exhibit illustrates the 179-foot elevation drop from the runway, including an MSE retaining wall, new embankment, security road, replacement channel, silt fence, rock underdrain, and a minimum 50-foot creek buffer for Miller Creek. The diagram is part of the Miller Creek Instream and Buffer Enhancements project for the Port of Seattle.