TagPart 150(262)

This October 2016 Port of Seattle briefing presents the Airport Noise Insulation Project for Sea-Tac Airport, outlining how a federally guided noise study (known as a Part 150) is used to identify noise and land-use conflicts in surrounding communities. The project aims to provide sound insulation to eligible homeowners in high-noise areas, with approved mitigation measures qualifying for 80% federal Airport Improvement Program (AIP) grant funding. The briefing covers project elements, homeowner eligibility requirements, community benefits, and associated costs.

The November 20, 2013 Highline Forum meeting, held at the Tukwila Community Center, included a Port of Seattle update featuring a recap of the Part 150 noise study and a review of upcoming Sea-Tac Airport capital projects, presented by Port of Seattle staff Stan Shepherd and Elizabeth Leavitt. The forum also addressed a vote on 2014 SW King County legislative positions, which included a new position related to port cooperation, and planning for the following year's meeting schedule and topics. Guidance provided to co-chairs ahead of the meeting outlined procedures for managing the legislative vote and organizing 2014 forum hosting responsibilities among member jurisdictions.

Seattle-Tacoma International Airport operates several noise programs aimed at reducing the impact of aircraft noise on surrounding communities, including sound insulation, flight track monitoring, and community land-use planning. A key component is the Part 150 Noise Study, which makes the airport eligible for federal grants and focuses on areas within the 65 decibel Day Night Level (DNL) contour, without imposing flight restrictions or shifting noise to other neighborhoods. The program also includes an updated Noise Remedy Boundary that has been expanded beyond the previous boundary to better reflect projected future noise contours around the airport.

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 document outlines the Future (2021) Noise Exposure Map and Noise Compatibility Program for Seattle-Tacoma International Airport, projecting noise levels for a typical day in 2021 assuming all recommended noise abatement measures are in place. Using the FAA's Integrated Noise Model, it forecasts 419,597 annual aircraft operations — a 15.4% increase over 2016 baseline levels — and maps noise contours at 65, 70, and 75 decibel DNL thresholds. The report details the fleet mix and runway usage data used in the modeling, with Boeing 737-800s representing the largest share of daily operations.

This chapter from Sea-Tac Airport's 2013 Part 150 Noise Compatibility Study explains how aircraft noise is measured and analyzed around Seattle-Tacoma International Airport. It covers the basic properties of sound—including loudness, pitch, and duration—and explains why noise is measured on the logarithmic decibel (dB) scale rather than a standard linear scale. The chapter also outlines how noise contour modeling was conducted to assess the real-world impact of aircraft operations on surrounding communities.

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.