Northwest Pipeline LLC NOTICE #33011 Pegram Valve Replacement & Mt. Vernon Scrubber Replacement Maintenance Reminde posted on Sep 4 2026 11:14AM TSP Name: Northwest Pipeline LLC TSP: 67977322 Critical: N Notice Stat Desc: INITIATE Notice Type Desc: MAINTENANCE Post D/T: 09/04/2026 11:06 AM MCT Notice Eff D/T: 09/04/2026 11:06 AM MCT Notice End D/T: Reqrd Rsp Desc: No response required Rsp D/T: Notice ID: 26-173 Prior Notice: Subject: Pegram Valve Replacement & Mt. Vernon Scrubber Replacement Maintenance Reminde Notice Text: As posted in the maintenance schedule on Northwest Pipeline's
website, Northwest will be performing maintenance at the
following locations next week:

- Pegram Compressor: located at MP 495.54 in
Bear Lake County, Idaho beginning gas day September 08,
2026, through gas day September 11, 2026.
- Mt. Vernon CS: located at MP 1440.18 in Skagit County,
Washington beginning gas day September 10, 2026, through
gas day September 23, 2026.

The Pegram Compressor will be limited to 602,000 Dth/d
northbound for the duration of the outage.

If primary nomination requests through the Pegram Compressor
exceeds the available capacity of 602,000 Dth/d northbound (or
whatever NWP cannot mitigate during any day of the
maintenance), pursuant to Sections 10.2 and 10.3 of Rate
Schedule TF-1 in Northwest's Tariff, Northwest will give
notice of a Declared Deficiency Period based on a design
capacity of 654,000 Dth/d northbound. The deficiency period
will continue until the work has been completed.

The Mt. Vernon CS will be limited to 1,113,000 Dth/d southbound
for the duration of the outage.

If primary nomination requests through the Mt. Vernon CS
exceeds the available capacity of 1,113,000 Dth/d southbound
(or whatever NWP cannot mitigate during any day of the
maintenance), pursuant to Sections 10.2 and 10.3 of Rate
Schedule TF-1 in Northwest's Tariff, Northwest will give notice
of a Declared Deficiency Period based on a design capacity of
1,277,000 Dth/d southbound. The deficiency period will continue
until the work has been completed.

Please reference the Maintenance Schedule tab at
www.northwest.williams.com for more information.

If you have any questions, please call your Commercial Services
Representative or the hotline at 713-215-6301.