TagPort Of Seattle(2343)

This technical memorandum, prepared by Leigh Fisher for the Port of Seattle in September 2023, presents an updated aviation activity forecast for Seattle-Tacoma International Airport. It includes Constrained Operating Growth Scenarios (COGS), FAA approval of the forecast update, and airside modeling documentation used to support environmental review. The forecast and operational assumptions outlined in this document serve as the foundation for planning future airport capacity and assessing potential noise and environmental impacts.

This technical memorandum, prepared by Leigh Fisher for the Port of Seattle in September 2023, provides an updated aviation activity forecast for Seattle-Tacoma International Airport as part of a FAA Part 150 noise study. It outlines forecast and operational assumptions—including projected aircraft types and flight activity levels—that were used to model future noise conditions around Sea-Tac. The report is accompanied by operational data appendices supporting the airport's long-term noise compatibility planning efforts.

This technical memorandum, prepared by Leigh Fisher for the Port of Seattle in September 2023, presents an updated aviation activity forecast for Seattle-Tacoma International Airport. It includes constrained operating growth scenarios (COGS), FAA approval documentation, and airside modeling data used to support environmental review planning. The forecast serves as a foundational planning tool for understanding future airport capacity and operational assumptions.

Table I summarizing analytical results for PFAS (per and polyfluoroalkyl substances) in groundwater at Sea-Tac Airport, prepared by Haley & Aldrich, Inc. in August 2023. Groundwater monitoring wells sampled include LAI-4, MW-01, MW-02, MW-03, T-111-MW-1, TF-MW-01 through TF-MW-08-D, DMC Augmentation Well, and Tyee Well, with sample dates ranging from March 2019 to April 2023. Analytes

A nomination letter from Geraldine Van Notric, a Hillgrove Cemetery Board Member, requests that Hillgrove Cemetery — located near Sea-Tac International Airport at 200th Street and 16th Ave. So. — be designated a King County Historic Site under Ordinance No. 4828. The cemetery, established with its first burial in 1900 and formally organized as an association in 1923, contains graves of pioneers who shaped the Highline area's economic development, as well as military veterans from the Civil War and World War I. The nomination emphasizes that the designation would provide community recognition and protection for the site, not serve as a request for county repair funds.

The Sea-Tac Communities Plan, sponsored by the Port of Seattle and King County, maps the West Reinforcement Area surrounding Seattle-Tacoma International Airport, identifying neighborhoods such as Hazel Valley, Chelsea, Sunny Terrace, Gregory Heights, and Blakley Manor that are affected by aircraft noise. The map uses color coding to highlight the Burien Center commercial core, grid cells where program eligibility is determined by noise criteria alone, streams and ponds, and areas of heavy vegetation. It distinguishes between single-family residential structures and other building types to guide noise mitigation and land-use planning decisions in communities near the airport.

The Sea-Tac Communities Plan, sponsored by the Port of Seattle and King County, maps out noise mitigation programs for residential and other structures in communities surrounding Seattle-Tacoma International Airport. The plan designates specific zones for different types of assistance, including property acquisition, purchase guarantees, cost-sharing insulation, and limited cost-sharing insulation, with a focus on the South Reinforcement Area. Grid cells are identified by noise criteria to determine which program applies to each affected neighborhood, covering areas such as the Southwest and Southeast Conversion Areas near the airport's passenger terminal.

This exploratory draft outlines a proposed Post Project Coordination Study for the Sea-Tac Communities Plan, designed to ensure that implementation programs are carried out effectively. It identifies seven key program areas requiring coordination, including noise reduction, drainage improvements, community action, zoning guidelines, capital improvements, and legislative advocacy. The document calls for a methodical study to analyze coordination needs, define responsibilities, and assign authorities across agencies such as the Port of Seattle, King County, and the FAA.