This August 2002 permit application by the Port of Seattle outlines proposed Master Plan Update improvements at Seattle-Tacoma International Airport, including the construction of a third runway, expanded taxiways, cargo facilities, and terminal upgrades. The documents map both on-site and off-site wetland mitigation areas required to offset environmental impacts, with retaining walls and creek relocations used to minimize effects on wetlands and Miller Creek. The project spans multiple sections of King County, Washington, and includes detailed plans for stormwater detention, runway safety areas, and property acquisition boundaries.Open full document
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An 18-sheet plan view document set depicting impact and mitigation sites for the proposed master plan update improvements at Seattle-Tacoma International Airport, including on-site and off-site wetland mitigation areas. The maps show master plan projects such as the third runway, interconnecting taxiways, MSE retaining walls, Miller Creek relocation, and runway safety areas. Wetlands in the Miller Creek Basin impacted by the improvements are also delineated.