TagSea-Tac Airport(2023)

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 Port of Seattle held a Regular Commission Meeting on September 23, 2025, covering routine business including approval of meeting minutes, claims totaling approximately $141 million, and personnel matters. A key action item was authorization for the Executive Director to renew a Bonneville Power Administration contract to supply electrical power to Seattle-Tacoma International Airport from 2028 through 2044, estimated at $150 million. The meeting also included a briefing on the 2026 preliminary budget rollup for Port-wide central services.

In August 2025, acoustical engineering firm HMMH measured indoor noise levels at 31 homes near Seattle-Tacoma International Airport to assess eligibility for the airport's Sound Insulation Repair and Replacement Program. Testing found that only one of the 31 homes met the FAA's minimum threshold of 45 decibels interior Day-Night Average Sound Level required to qualify for full sound insulation treatment, while seven additional homes had at least one room exceeding that level. The study used FAA-approved methods, including a Boeing 737-800 aircraft noise spectrum, to calculate how much airport noise penetrates each habitable room with windows closed.