TagWSDOT(123)

This report analyzes existing traffic conditions around Seattle-Tacoma International Airport as part of the Sustainable Airport Master Plan (SAMP) Near-Term Projects Environmental Review. It examines 108 intersections—including signalized, stop-controlled, and uncontrolled locations—along key travel routes connecting the airport to surrounding communities, focusing on weekday PM peak hour traffic volumes. The study also includes freeway analysis of SR 518 and I-5 ramps and segments at the request of WSDOT.

This appendix outlines the traffic mitigation measures required for the Seattle-Tacoma International Airport Sustainable Airport Master Plan Near-Term Projects, as mandated by the FAA's Record of Decision and the Port of Seattle's State Environmental Policy Act Environmental Impact Statement. It details specific intersection improvements across multiple jurisdictions—including the City of SeaTac, City of Burien, City of Des Moines, and WSDOT—such as new traffic signals, roundabouts, and turn lane additions, along with proportionate-share cost contributions where full mitigation is not required. The measures are designed to address projected traffic impacts through 2037 and maintain acceptable levels of service at affected intersections near the airport.

WSDOT Aviation Division presentation outlining Advanced Air Mobility concepts in Washington State. Covers alternative energy sources, operation types, aircraft configurations, and size categories for AAM vehicles.

P020444-042926 Installment #2 WSDOT/FAA Email chain forwarded by Ann Richart (WSDOT Aviation Director) to Ryan Zulauf (FAA) on March 18, 2026, documenting escalating FAA compliance dispute over Washington State aviation fuel taxes and federal revenue use requirements. Steven Breaux (WSDOT Director of Legislative Relations) provides a timeline of correspondence from April 10, 2024 through March

Email correspondence between FAA, Washington State Department of Revenue (Acting Director John Ryser), WSDOT (Julie Meredith, Ann Richart), and Office of Financial Management (Katherine Chapman-See) regarding FAA Review of Washington State Aviation Fuel Taxes and Compliance with Federal Revenue Use Requirements. Includes auto-reply from FAA’s Ryan Zulauf (November 6, 2025) and March 17, 2026 notification