The most requested documents–and all related-content
This page is an attempt to solve a problem we’ve had since the beginning: how to get visitors to study documents and all the related content which often provides the necessary context. For example, most studies are meant to be read by specialists. If you are a layperson, you may only be interested in the ‘one-pager’. This page shows you both.
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1996-02-01Final Environmental Impact Statement for proposed Master Plan Update development actions at Seattle-Tacoma International Airport
This 1996 Final Environmental Impact Statement, prepared jointly by the FAA and the Port of Seattle, evaluates proposed expansion plans at Seattle-Tacoma International Airport through the year 2020, including the construction of a third parallel runway up to 8,500 feet long, a new north terminal, and various landside improvements. The document assesses environmental consequences across 24 categories—including noise, air quality, water quality, and human health—for a range of alternatives, from building a new regional airport to a no-build option. Ultimately, the Port of Seattle selected Alternative 3 as the preferred option, concluding that Sea-Tac was the only feasible site to address the region's growing air transportation needs. -
1997-05-13Final Supplemental Environmental Impact Statement for the Proposed Master Plan Update Development Actions at Seattle-Tacoma International Airport, Volume 1: Main Text and Appendices A through C-1
This 1997 Final Supplemental Environmental Impact Statement (SEIS) examines the environmental effects of proposed expansion plans at Seattle-Tacoma International Airport, including construction of a new third parallel runway, terminal improvements, and parking upgrades. The study was prompted by faster-than-expected growth in air travel demand during the mid-1990s, which exceeded earlier forecasts and required updated analysis of noise, air quality, wetland, and community impacts. The document was jointly prepared by the FAA and the Port of Seattle to ensure the proposed developments met federal and Washington State environmental policy requirements. -
1999-02-01Port Of Seattle and City of SeaTac joint transportation study fact sheet
A February 1999 fact sheet outlining the Joint Transportation Study jointly undertaken by the City of SeaTac and the Port of Seattle under an Interlocal Agreement. The study aims to address ground transportation needs through 2020, covering topics such as population and passenger growth, parking, new transit modes including light rail, neighborhood protection, and pedestrian and bicycle access. It also examines Transportation Demand Management strategies to reduce vehicle traffic around Seattle-Tacoma International Airport. -
1997-02-01Sea-Tac International Airport impact mitigation study: Initial assessment and recommendations
★ 32The HOK Study. 1997 initial assessment and recommendations report for the Sea-Tac International Airport Impact Mitigation Study, prepared by Hellmuth, Obata + Kassabaum and Raytheon Infrastructure Services. The study was funded by a State of Washington grant on behalf of the cities of Burien, Des Moines, Federal Way, Normandy Park, and Tukwila, as well as -
Sea-Tac-Airport-Final-EIS-Feb.-1996-Vol
This page is from the Executive Summary of the Sea-Tac Airport Master Plan Update Final Environmental Impact Statement (EIS), discussing noise mitigation strategies including sound insulation, noise budget limits, nighttime limitations, flight corridorization, and land acquisition in the Approach Transitional Area. It estimates acquisition and relocation costs for approximately 309 residential homes and multi-family buildings at roughly $35 million, referencing an FAA Memorandum dated April 30, 1991. -
2003-01-01SR 509: Corridor Completion/I-5/South Access Road final environmental impact statement and Section 4(f) evaluation
This January 2003 Final Environmental Impact Statement evaluates proposed highway improvements in southwest King County, Washington, including an extension of SR 509 and upgrades to I-5 between South 210th Street and South 310th Street to improve regional access to Seattle-Tacoma International Airport. Three build alternatives and a No Action Alternative are assessed, with the SR 509 extension designed to accommodate two general purpose lanes and a center high-occupancy vehicle lane in each direction. The project was jointly prepared by the Federal Highway Administration, Washington State Department of Transportation, Port of Seattle, King County, and the Cities of SeaTac and Des Moines. -
2020-05-01SR 518 Corridor Planning Study
The SR 518 Corridor Planning Study, published by the Washington State Department of Transportation (WSDOT) in May 2020, examines the stretch of State Route 518 running from SR 509 to Interstate 5 (milepost 0.00 to 3.42) in the Seattle area near Sea-Tac Airport. The study was conducted by WSDOT's Management of Mobility Division to evaluate transportation conditions and identify potential improvements along this key corridor. It was formally approved by WSDOT leadership in November 2019 and includes standard civil rights and accessibility notices in both English and Spanish. -
1992-10-01The Flight Plan Project Final Environmental Impact Statement
The Flight Plan Project, a joint effort by the Puget Sound Regional Council and the Port of Seattle, produced this 1992 Final Environmental Impact Statement to evaluate long-term commercial air transportation options for the central Puget Sound region. It examines system-level alternatives ranging from expanding Sea-Tac Airport to building new airport facilities, assessing trade-offs related to noise, air quality, land use, and regional quality of life. The document serves as a programmatic planning tool, with no single preferred alternative identified, intended to guide future site-specific environmental reviews and regional airport policy decisions. -
The Sea-Tac Communities Plan
★Overview The draft Sea-Tac Communities Plan (STCP) (known as “the Redbook” was delivered to the King County Council and Port of Seattle Commissioners in January 1975 after eighteen months of work and a $641,000 grant from the FAA. The authors were the Policy Advisory Committee, a twelve member group of citizens, King County, Port staff,