TagPort Of Seattle(2405)

This appendix from Seattle-Tacoma International Airport's Final Supplemental Environmental Impact Statement evaluates potential environmental impacts through the year 2020 under three scenarios, including the new Port forecast and cases where aviation demand grows 10% faster than projected. Key findings indicate that noise impacts are expected to remain below current levels in all scenarios, with 'With Project' improvements producing roughly 53% of current noise conditions by 2020. The analysis also examines air quality, enplanement levels, and aircraft operations across both Do-Nothing and preferred alternatives to guide long-term airport planning.

Final Supplemental Environmental Impact Statement (SEIS) dated May 1997, prepared jointly by the FAA Northwest Mountain Region (responsible official Dennis Ossenkop) and Port Of Seattle (SEPA contact Barbara Hinkle), for proposed Master Plan Update development actions at Seattle-Tacoma International Airport. Covers proposed 8,500-foot third parallel runway (Runway 16X/34X) located 2,500 feet west of existing Runway

This technical report supplements the Final Environmental Impact Statement for Seattle-Tacoma International Airport's Master Plan Update, focusing on construction impacts related to the proposed Third Runway and associated projects. It analyzes fill material requirements estimated at 17.25 million cubic yards, haul routes, and truck traffic volumes, noting that the construction timeline was extended from three to five years, which reduced the number of average daily truck trips compared to earlier estimates. The report examines both on-site and off-site material sources and assesses potential traffic congestion impacts on regional roadways during the construction period.

This 1997 Final Supplemental Environmental Impact Statement (SEIS) evaluates the environmental effects of proposed expansion projects at Seattle-Tacoma International Airport, including the construction of a new 8,500-foot third parallel runway, terminal improvements, parking expansions, and cargo facilities. The document addresses a range of potential impacts such as noise, air and water quality, wetlands, and floodplains resulting from increased aviation activity. It was prepared jointly under federal (NEPA) and Washington State (SEPA) environmental review requirements by the Port of Seattle and the Federal Aviation Administration.

Resolution No. 3245 from the Port of Seattle Commission reaffirms approval of a Master Plan Update for Seattle-Tacoma International Airport (Sea-Tac), authorizing construction of a new third dependent runway, an expanded parking garage, and a new north employee parking lot. The resolution follows years of regional studies, public hearings, and environmental impact reviews concluding that a third runway is necessary to address growing air traffic demand and poor-weather delays caused by the close spacing of the two existing runways. The Port also reaffirms commitments to additional noise reduction measures for surrounding communities, in accordance with Puget Sound Regional Council Resolution A-96-02.

A 1997 Agreed Order issued by the Washington State Department of Ecology directed the Port of Seattle to address hazardous substance contamination at Seattle-Tacoma International Airport. Jet fuel, gasoline, industrial solvents, and other chemicals had been released across twelve separate sites within a half-square-mile Aircraft Operations and Maintenance Area, impacting both soil and groundwater. The order established a framework for ongoing environmental investigation and cleanup while acknowledging the operational challenges of working in an active airport environment.

Letter dated December 18, 1996 from Barbara Hinkle, Senior Environmental Specialist, Port Of Seattle, to Jack Kennedy, U.S. Army Corps of Engineers, Seattle District Office, submitting a Section 404 Application to place fill material into waters of the United States at Seattle-Tacoma International Airport associated with the Master Plan Update. Covers background on the Puget

In December 1996, the Port of Seattle submitted a Section 404 permit application to the U.S. Army Corps of Engineers to place fill material in waters of the United States as part of Sea-Tac Airport's Master Plan Update, which included construction of a third parallel runway. The application explains that the new runway, located 2,500 feet west of the existing 16R/34L runway, was needed to reduce severe arrival delays during poor weather conditions, which were costing airlines approximately $42 million annually. The project was the outcome of nearly a decade of regional planning, including the PSRC's Flight Plan Study, which evaluated numerous alternatives before recommending the runway expansion as the best solution for the region's long-term air travel needs.

In December 1996, the Port of Seattle submitted a Section 404 permit application to the U.S. Army Corps of Engineers to place fill material into wetlands at Seattle-Tacoma International Airport as part of its Master Plan Update, which included construction of a third parallel runway. The proposed runway, located 2,500 feet west of the existing runways, was intended to address severe arrival delays during poor weather conditions, which reduced airport capacity from 60 to as few as 24 arrivals per hour roughly 44% of the year. The application was the result of nearly a decade of regional planning, environmental review, and public involvement, including studies confirming that no feasible supplemental airport sites existed in the four-county region.

JARPA (Joint Aquatic Resources Permit Application) and Section 404 application submitted by Port Of Seattle to the U.S. Army Corps of Engineers (Jack Kennedy, Seattle District Office) in December 1996, prepared by Parametrix, Inc. Requests authorization to place fill material into waters of the United States at Sea-Tac Airport associated with the Master Plan Update