TagLandrum & Brown(52)
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2025-09-24Final Environmental Assessment for the Sustainable Airport Master Plan Near-Term Projects: Seattle-Tacoma International Airport
★ 33The Federal Aviation Administration (FAA) released a Final Environmental Assessment (EA) in September 2025 for near-term construction and development projects at Seattle-Tacoma International Airport, prepared on behalf of the Port of Seattle. The Final EA was updated from an earlier Draft EA to reflect public and agency comments, correct errors, and remove sections on climate change, environmental justice, and cumulative impacts following changes to federal executive orders, regulations, and a 2025 Supreme Court ruling. These regulatory shifts meant the FAA was no longer required to analyze how the proposed projects might affect vulnerable communities or contribute to broader environmental trends. -
2013-10-15
Informal Runway Use Agreement (Appendix I 2013 Part 150 Study)
★ 32Appendix I from the 2013 Part 150 Study by Landrum & Brown. A Letter Of Agreement (LOA) where the Port Of Seattle agrees to using the Third Runway primarily for overflows and bad weather. Note the very official looking signature of the Port CEO, Tay Yoshitani. Also note that it is described as an ‘informal -
2013-10-01Seattle-Tacoma International Airport Part 150 noise compatibility study final: Chapter one – inventory
★This document is Chapter One of the Seattle-Tacoma International Airport (Sea-Tac) Part 150 Noise Compatibility Study, finalized in October 2013. It provides an overview of the airport's size, ownership by the Port of Seattle, and its role as the Pacific Northwest's primary commercial hub, while explaining the federal regulations (14 CFR Part 150) that guide airport noise compatibility planning. The study was undertaken to update a 2002 noise plan, accounting for major changes such as the opening of a third parallel runway in 2008, with the goal of reducing noise impacts on surrounding communities. -
Appendix K SEPA Environmental Justice Disparities Map page 124
Figure 5-1 from a SEPA Environmental Justice Memorandum prepared by Landrum and Brown (document no. 553-2912-002, dated April 2026) maps Washington Department of Health Environmental Health Disparities Index scores across census tracts in the Sea-Tac Airport vicinity, including Seattle, Tukwila, Burien, SeaTac, Renton, Kent, and Des Moines. The map delineates four overlapping study areas—General Study Area, Surface Transportation Study Area, Air Dispersion Study Area, and Noise Study Area (65 dB contour)—over a background showing health disparity rankings ranging from 1–5 (Low) to 10 (High), with most tracts in the project vicinity ranked 9–10. -
2026-05-01Seattle-Tacoma International Airport SEPA Environmental Impact Statement for the Sustainable Airport Master Plan Near-Term Projects: Chapter 2 — Alternatives
This draft Environmental Impact Statement (EIS) evaluates proposed expansion projects at Seattle-Tacoma International Airport under Washington State's Environmental Policy Act (SEPA). It outlines a two-step screening process used to assess alternatives, including suggestions from public scoping such as building a new airport, using other transportation modes, and limiting growth — most of which were rejected for failing to meet the project's purpose of serving 56 million annual passengers at an optimal level of service. A No Action Alternative is also included, representing a future baseline without the proposed physical improvements. -
2025-09-01Seattle-Tacoma International Airport Environmental Assessment for the Sustainable Airport Master Plan Near-Term Projects: List of Preparers
This section of the Seattle-Tacoma International Airport Environmental Assessment lists the individuals and organizations responsible for preparing the EA for the Sustainable Airport Master Plan Near-Term Projects, finalized in September 2025. It includes contributors from the FAA, Port of Seattle, and multiple consulting firms covering areas such as noise analysis, air quality, surface transportation, wetlands, cultural resources, and public engagement. Key organizations involved include Landrum & Brown, Concord Engineering, Confluence Environmental Company, Parametrix, Stell Environmental, and others. -
Recommended Noise Remedy Boundary Map — Sea-Tac Airport Part 150 Study
This map, prepared by Landrum & Brown for the Port of Seattle's 14 CFR Part 150 Study at Seattle-Tacoma International Airport, shows the Recommended Noise Remedy Boundary (blue dashed line) alongside the Existing Remedy Boundary (black dashed line) and the Future (2018) NEM/NCP 65 DNL Noise Exposure Contour. The future noise contour covers 7.3 square miles, encompassing an estimated 3,771 housing units, 9,712 residents, and 9 noise-sensitive facilities in communities including Des Moines, Burien, SeaTac, Normandy Park, and Tukwila. -
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Landrum & Brown (L&B) Aviation Consulting Logo
The image shows the logo of L&B (Landrum & Brown), an aviation consulting firm that has historically been involved in airport noise studies and planning, including work related to Sea-Tac Airport. The logo features a stylized geometric design in blue alongside the 'L&B' text. -
2024-10-01Seattle-Tacoma International Airport Environmental Assessment for the SAMP Near-Term Projects: Chapter 4 — Environmental Consequences
This October 2024 draft Environmental Assessment evaluates the potential environmental impacts of near-term construction and operational projects at Seattle-Tacoma International Airport under three alternatives: No Action, a Proposed Action, and a Hybrid Terminal Option. The analysis covers impacts through 2032 and an out-year of 2037, finding that increases in air quality emissions and effects on biological resources are not considered significant, with mitigation measures proposed for stormwater management and migratory bird nesting. Farmlands and Wild and Scenic Rivers were determined to have no presence in the study area and required no further analysis.