TagSEPA(293)

This Noise Technical Report, prepared by Landrum & Brown for the Port of Seattle in March 2024, analyzes noise impacts associated with near-term construction and development projects outlined in the Sustainable Airport Master Plan for Seattle-Tacoma International Airport. The report is part of Appendix J, which covers noise and noise-compatible land use, and was developed to satisfy both federal (NEPA) and state (SEPA) environmental review requirements. It provides technical findings to help assess how proposed airport improvements may affect noise levels in surrounding communities.

This technical memorandum from Landrum & Brown (February 2024) explains that noise modeling for the Seattle-Tacoma Airport (SEA) Sustainable Airport Master Plan (SAMP) Environmental Review was updated from AEDT Version 3e to the newer AEDT Version 3f, released December 13, 2023. The upgrade allowed modelers to use actual aircraft data for the Boeing 737-7 and Cessna 408 SkyCourier rather than substitute aircraft, improving modeling accuracy. The document details the specific airframe, engine, and Aircraft Noise and Performance (ANP) data changes made between the two software versions.

This technical report, prepared by Parametrix for the Port of Seattle in February 2024, documents the wetlands and streams found at Seattle-Tacoma International Airport as part of the Sustainable Airport Master Plan (SAMP) Near Term Projects. It covers the delineation of wetland and stream boundaries, assessments of potential impacts to these aquatic areas from planned airport projects, and proposed mitigation measures and permitting strategies to address those impacts.

This Washington State fiscal note summarizes the estimated costs of House Bill 2070, which relates to environmental justice and State Environmental Policy Act (SEPA) projects. The bill is projected to cost multiple state agencies a combined total of approximately $1.28 million in operating expenditures for 2023-25, rising to $2.64 million in 2025-27, before declining to about $1.61 million in 2027-29. The Department of Ecology, Department of Fish and Wildlife, and Office of the Attorney General are among the primary agencies expected to incur costs, with some impacts remaining indeterminate.

Washington State House Bill 2070 requires government agencies to complete environmental justice impact statements alongside standard environmental reviews for new, expanding, or permit-renewing projects located in pollution-burdened communities. The bill outlines what these statements must include, how affected communities must be notified and given input, and mandates that agencies deny or require mitigation for projects that would worsen environmental or public health conditions in already overburdened areas. Note that this bill addresses broad statewide environmental justice policy and does not specifically pertain to Sea-Tac Airport noise issues.

This Land Use Technical Report, prepared for the Port of Seattle's Sustainable Airport Master Plan Near-Term Projects, examines how proposed improvements at Seattle-Tacoma International Airport align with land use plans and regulations in surrounding communities including SeaTac, Des Moines, Burien, and Tukwila. It reviews existing and planned land uses, relevant local and regional planning documents, and assesses potential land use impacts under three alternatives: No Action, Proposed Action, and a Hybrid Terminal Option. The report was originally prepared in January 2024 by Landrum & Brown and later updated in April 2026 by Parametrix for the SEPA Environmental Impact Statement.