TagNoise Exposure Update(30)

This document is the agenda and attendance record for the fourth meeting of the Part 150 Study Technical Review Committee, held on August 11, 2025, at Seattle-Tacoma International Airport. The meeting covered updates on Phase 1 Noise Exposure Mapping, a kickoff for Phase 2 Noise Compatibility Program planning, and a review of the project schedule. Representatives from neighboring cities, airlines, King County, the FAA, and the Port of Seattle participated as members or liaisons.

A community member wrote to a GAO researcher studying NextGen aviation noise impacts near Seattle-Tacoma International Airport, urging that community complaints be paired with responses from the FAA and Port of Seattle to ensure credibility. Key concerns raised include an outdated noise exposure map that has not been updated despite significant growth in air traffic, and the FAA's alleged refusal to answer questions submitted as far back as April 2018. The letter argues that without official rebuttals or supporting documentation, community perceptions risk appearing unsubstantiated and could undermine the integrity of the GAO study.

This map, prepared by Landrum & Brown for the Port of Seattle's 14 CFR Part 150 Study Update, shows projected aircraft noise exposure around Seattle-Tacoma International Airport for the year 2018. It illustrates three noise contour zones (DNL 65, 70, and 75 dBA), with the total area above DNL 65 dBA covering approximately 7.3 square miles and affecting an estimated 3,771 housing units and 9,712 residents. The map also identifies noise-sensitive land uses such as schools, churches, hospitals, and libraries within the affected area, and was certified by the Port of Seattle's Director of Aviation Planning and Environmental Programs.

This is the Existing (2013) Noise Exposure Map for Seattle-Tacoma International Airport, prepared as part of a 14 CFR Part 150 Study Update by Landrum & Brown for the Port of Seattle. The map shows aircraft noise contours around Sea-Tac, indicating that the DNL 65 dBA or greater noise zone covers approximately 5.9 square miles and affects an estimated 1,887 housing units and 4,879 residents, along with 9 noise-sensitive facilities such as schools and churches. The map was certified by Port of Seattle Aviation Planning Director Elizabeth Leavitt as accurately representing existing noise conditions based on the best available data.

This October 2013 final report, prepared by Landrum & Brown for the Port of Seattle, updates the noise exposure maps and noise compatibility program for Seattle-Tacoma International Airport under federal regulations (14 CFR Part 150). It assesses the impact of aircraft noise on surrounding communities and outlines strategies to reduce noise-related conflicts between the airport and neighboring land uses. The study serves as a key planning document guiding Port of Seattle noise mitigation policies at Sea-Tac Airport.

This document outlines the proposed schedule for Sea-Tac Airport's Part 150 Noise Compatibility Study, running from May 2012 through March 2013. Key milestones include submitting a preliminary draft to the FAA in October 2012, a public comment period and hearing in January 2013, and final submission to the FAA by March 15, 2013. The schedule also details four Port Commission briefings at which officials would be updated on noise exposure maps, FAA feedback, and the formal adoption of the final Part 150 document.

This September 2003 report presents an update to the FAR Part 150 Noise Exposure Maps for Snohomish County Airport (Paine Field) near Everett, Washington, prepared by Barnard Dunkelberg & Company. It covers airport inventory, aircraft operations forecasts, and the development of noise contours to map areas affected by aircraft noise. The study was conducted with input from a Study Advisory Committee and involved formal public consultation processes.

This 1993 document presents Adjusted Noise Exposure (ANE) values for each 1/16 section within the Sea-Tac Airport study area, displayed as a grid referenced by row numbers (1–50) and column letters (A–X). The values represent measured noise levels across the surrounding region, with higher readings concentrated near the airport boundary and lower values toward the outer edges of the study area. Handwritten annotations indicate noise zone classifications at 30, 33, 40, and 45 ANE thresholds, which were used to define noise impact zones for land use planning purposes.

This document presents the Sea-Tac International Airport Noise Exposure Update prepared for the Port of Seattle, including a detailed airfield layout showing the two parallel runways (16R/16L and 34R/34L) and associated taxiways. It also includes flight track maps for both South Flow and North Flow operations, illustrating arrival and departure routes used by aircraft over the surrounding communities. The exhibits provide a geographic overview of how flight paths extend across the Seattle metropolitan area, informing noise exposure assessments for airport planning and policy purposes.