NORTHWEST PIPELINE LLC — Integrity Assurance Notification

MAOP RECONFIRMATION METHOD 612874, Mountain West Pipeline, LLC 13845, Northwest Pipeline 19570, Transcontinental Gas Pipeline 30826, Williams Field Services 30940, Williams Energy, LLC 31565, Gulfstream 31687, Hill Lake Gas Storage, LLC 32285, Worsham Steed Gas Storage, LLC 32374, Monroe Gas Storage Company, LLC 32375, Southern Pines Energy Center, LLC 32657, Cardinal Operating 32684, Pine Needle The purpose of this document is to provide notification in accordance with §192.18 of Williams’ intent to use a Direct Examination (DE) Operating Standard for MAOP Reconfirmation in accordance with 49 CFR 192.624(c)(6). Upon approval from PHSMA, the following attached Operating Standard will be incorporated into Williams procedures and referenced as an option for reconfirmation of MAOP for pipelines meeting the requirements of 49 CFR 192.624(a). Williams intends to use this Operating Standard in locations that Methods 1 through 5 are deemed impractical due to physical or operational constrains.#