TagPart 150(117)

A presentation introducing the Part 150 Study process for Seattle-Tacoma International Airport. The document explains the federal regulatory framework for preparing Noise Exposure Maps and Noise Compatibility Programs, outlines the phases of the study process, and provides historical context of previous Part 150 studies conducted at SEA from 1985 to 2014.

The Highline Forum held its September 24, 2025 meeting at the City of Des Moines Police Training Room, with key agenda topics including an update on the Part 150 Noise Study for Seattle-Tacoma International Airport and the South King & Port Community Fund Environmental Improvement Program. The hybrid meeting, co-chaired by Councilmember Matt Mahoney, also featured presentations on the SEA Airport Aviation Director search and a StART update from Port of Seattle representatives. The forum meets bimonthly throughout 2025, rotating among local host cities including Federal Way, Burien, Des Moines, and SeaTac.

14 CFR Part 150 sets out the federal rules for airport noise compatibility planning, establishing how airports must measure noise, map affected areas, and develop programs to reduce conflicts between aircraft noise and nearby land uses. It defines key terms such as day-night average sound level (DNL), compatible and noncompatible land use, and noise exposure maps, and it outlines the process by which the FAA reviews and approves or disapproves airport noise compatibility programs. Importantly, FAA approval of such a program does not itself commit federal funding or authorize specific actions without further environmental review.