PIERCE COUNTY NOTICE OF DETERMINATION OF NONSIGNIFICANCE ADOPTION OF EXISTING DOCUMENT Site Development/ Environmental Review: Thun Field Runway Construction Pierce County Planning and Public Works Application: 1065444 Notice is hereby provided in accordance with PCC, Chapter 18.80 and Section 18D.40.050, and WAC 197-11-510 that Pierce County has issued a Determination of Nonsignificance (DNS) on the following proposal: Pierce County Planning and Public Works, in cooperation with the Federal Aviation Administration (FAA), is proposing to construct airport improvements at Thun Field. The proposal includes full depth reconstruction and widening of Runway 17-35, reconstruction and/or milling/overlay of select taxiway connectors, surface and subsurface drainage improvements, electrical and Navigational Aid improvements, and obstruction removal. Pierce County, acting as lead agency, has determined that the proposal will not result in significant adverse impacts on the environment. An Environmental Impact Statement (EIS) will not be required. This decision was made after the review of a completed environmental checklist and other information on file. This information is available to the public on request. This DNS is issued under WAC 197-11-340. Pierce County may not act on this proposal prior to April 13, 2026. Comments must be submitted by close of business on April 10, 2026. An appeal of this determination must be filed no later than April 24, 2026. Appeal Submittal Information can be found at: Administrative Appeals | Pierce County, WA - Official Website IPL0326723 Mar 31 2026