TagEnvironmental Impact Statement(325)

This technical report analyzes existing surface transportation and traffic conditions around Seattle-Tacoma International Airport as part of the Sustainable Airport Master Plan (SAMP) Near-Term Projects Environmental Review. It examines 108 intersections — including signalized, stop-controlled, and uncontrolled locations — along key travel routes connecting the airport to surrounding communities, focusing on weekday PM peak-hour traffic volumes. The study also includes freeway analysis of SR 518 and I-5 ramps and segments at the request of WSDOT.

The Federal Aviation Administration (FAA) issued a Negative Determination in July 2024, concluding that planned near-term construction and equipment relocation projects at Seattle-Tacoma International Airport (SEA) are not reasonably likely to cause effects on Washington State's coastal zone. The 31 Near-Term Projects, which include taxiway extensions, blast pad expansions, and relocation of navigational aids, are part of the airport's Sustainable Airport Master Plan and are scheduled to begin construction in 2026. The FAA requested written concurrence from the Washington State Department of Ecology, while the Port of Seattle remains responsible for separate consistency certification for any projects requiring Clean Water Act permits.

In May 2024, the Council on Environmental Quality published major updates to the rules governing how federal agencies must review environmental impacts of projects, affecting everything from public participation to project timelines. The changes place new emphasis on environmental justice, requiring agencies to meaningfully engage communities facing disproportionate environmental burdens, and remove previous rules that limited who could challenge agency decisions in court. While some updates are designed to speed up the review process, others may add new requirements for agencies and project sponsors seeking federal permits or funding.

This technical report, prepared by Landrum & Brown for the Port of Seattle in June 2024, outlines the purpose and need for near-term construction and improvement projects identified in Sea-Tac Airport's Sustainable Airport Master Plan. It is part of a broader set of supporting documents that also covers alternatives analysis, terminal needs assessment, and air cargo facility requirements. The report provides the foundational justification for proposed airport development decisions and infrastructure changes.

This technical report, prepared by Landrum & Brown for the Port of Seattle in June 2024, outlines the purpose and need for near-term capital projects identified in Sea-Tac Airport's Sustainable Airport Master Plan. It is part of a broader set of supporting documents that also covers alternatives analysis, terminal needs assessment, and air cargo facility requirements. The report provides the foundational justification for proposed airport improvements and infrastructure expansions at Seattle-Tacoma International Airport.

This technical report, prepared by Landrum & Brown for the Port of Seattle in June 2024, outlines the purpose and need for near-term construction and improvement projects identified in the Sustainable Airport Master Plan for Seattle-Tacoma International Airport. It is part of a broader set of supporting documents that also covers alternatives analysis, terminal needs, and air cargo facility requirements. The report provides the foundational justification for planned airport development decisions.

The U.S. Navy announced its decision to expand EA-18G Growler jet operations at Naval Air Station Whidbey Island, Washington, by adding 36 aircraft and increasing flight training activities at both Ault Field and Outlying Landing Field Coupeville. Under the chosen plan (Alternative 2A), 80% of field carrier landing practice sessions will occur at OLF Coupeville, with noise-reduction measures included to limit community impact. The full Environmental Impact Statement and supporting documents were made available on the project website in September 2018.

This document is a review by ABCx2 of a Port of Seattle presentation to the city of Burien regarding the Sea-Tac Airport Master Plan (SAMP) Environmental Impact Statement. It raises concerns about the Port's decision to limit its environmental review of airport impacts to 2018 rather than 2012, questions whether significant construction growth and flight increases during that period were properly analyzed under federal (NEPA) and state (SEPA) environmental law, and challenges the Port's characterization of the FAR Part 150 noise abatement process as purely voluntary. The document also examines potential consequences if the Port fails to meet noise mitigation commitments tied to federal funding.

This Noise Technical Report, prepared by Landrum & Brown for the Port of Seattle in March 2024, analyzes noise impacts associated with near-term construction and development projects outlined in the Sustainable Airport Master Plan for Seattle-Tacoma International Airport. The report is part of a broader Appendix J covering noise and noise-compatible land use, which also includes a Noise Modeling Protocol and a Construction Noise Technical Report. Together, these documents provide technical assessments to guide planning decisions that balance airport operations with the noise concerns of surrounding communities.