MPLX LP — Integrity Assurance Notification

COMPLIANCE DELAY TYPE CIn accordance with 49 C.F.R. § 192.18, MPLX (Operator ID 40149) is respectfully requesting that the Pipeline and Hazardous Materials Safety Administration (PHMSA) approve an alternative to the May 16, 2023, deadline in 49 C.F.R. § 192.9(g) for (1) complying with the corrosion control requirements in Subpart I under 49 C.F.R. § 192.9(e)(1)(ii) and (2) establishing the maximum allowable operating pressure (MAOP) of under 49 C.F.R. § (e)(2)(ii) of approximately 154.62 miles of onshore gas gathering lines in Colorado, New Mexico, Oklahoma, Texas, Wyoming. As explained in more detail below, MPLX is requesting an alternative compliance deadline to account for the time needed to complete its review of the original records and acquisition of additional information and data from field surveys. MPLX notes that it acquired many of these historically-unregulated gas gathering lines, and the original design, construction, and installation of certain segments dates back to the 1970s to the 2010s. MPLX further notes that the 8-inch steel portions of the pipeline systems are subject to PHMSA’s July 8, 2022, Notice of Limited Enforcement Discretion for Particular Type C Gas Gathering Lines. Under that exercise of enforcement discretion, PHMSA has advised operators that it will refrain from enforcing the corrosion control and MAOP requirements for existing 8-to-12-inch Type C lines until May 17, 2024.#