COLONIAL PIPELINE CO — Integrity Assurance Notification

PRESSUREThis notification is to satisfy the regulatory requirements of 49 C.F.R. § 195.452(h)(1)(ii) for a long-term pressure reduction regarding an anomalous condition discovered via an integrity assessment. Colonial Pipeline Company’s (Colonial) operator ID number is 2552. As explained in greater detail below, Colonial’s current pressure reduction on its Line 18 Atlanta to Sugarlimb will exceed 365-days due to permitting delays and excavation complications associated with accessing an anomaly that is in close proximity to active railroad lines in the Chattanooga, Tennessee area. Colonial is actively working on excavating and exposing the subject anomaly and expects to have it exposed, evaluated, and repaired no later than August 7, 2023. Further remedial actions include: Recalculation of the failure pressure ratio (burst pressure / maximum transient pressure) from 1.42 to 1.72 upon confirmation that the anomaly is in a 16” OD 0.375” wt. X 52 elbow (rather than a conservative previous assumption that the anomaly was in 16” OD 0.281” wt. X60 pipe). Continuous on-site visual and atmospheric monitoring of the anomaly location during ongoing excavation activities, which are occurring 7-days a week.#