STATE OF WASHINGTON DEPARTMENT OF ECOLOGY FEDERAL CLEAN AIR ACT AIR OPERATING PERMIT PROGRAM NOTICE OF ISSUANCE OF DRAFT PERMIT Gas Transmission Northwest #8 638 Lambdin Road Wallula, WA 99363 Ecology's Air Quality Program is preparing to renew a draft air operating permit (AOP) for Gas Transmission Northwest Natural Gas Compressor Station #8, located 3 miles east of Wallula Junction on U.S. Hwy 12, near Wallula, in Walla Walla County. Gas Transmission Northwest (GTN) has a compressor station located near Wallula. It uses natural gas compressors to maintain the pressure of natural gas flowing through pipelines that run from Canada to California, passing through Washington. Project documents are available for review at: ecology.wa.gov/GTN8 Ecology determined that this proposal meets the requirements of Chapter 173-401 Washington Administrative Code (WAC). We plan to approve the renewal and will accept written comments on this action beginning at midnight on Wednesday, September 18, 2025, and ending at 11:59 p.m. on Sunday, October 19, 2025. The applicant, or any interested government entity, person, or group, may request a public hearing during the public comment period. A written request must include the interest of the entity requesting the public hearing and the reasons for it. We will hold a public hearing if there is significant public interest. To comment or request an online public hearing, use one of the ways listed below by October 19, 2025. Andy Kruse – andy.kruse@ecy.wa.gov, 509-405-0299 Washington Department of Ecology Eastern Region 4601 N. Monroe St., Spokane, WA 99205 To learn if there are additional records for this project, contact Ecology's Public Records Office. To request ADA accommodations, contact Ecology's ADA Coordinator at ecyadacoordinator@ecy.wa.gov, or 360-407-6831, 711 (relay service), or 877-833-6341 (TTY). This notice was posted on Ecology's website on September 18, 2025. IPL0272717 Sep 18 2025