COLUMBIA GAS TRANSMISSION, LLC — Integrity Assurance Notification

REASSESSMENT INTERVAL ABOVE 30% SMYSTC Energy, operator of the Columbia Gas Transmission Company (TCO) pipelines is providing this §192.18 Notification to Pipeline and Hazardous Materials Safety Administration (PHMSA), requesting a §192.939(a) six-month extension of the 7 year reassessment interval for 4 HCA segments on the AM04 and 5 HCA segments on the AM09 pipelines located in Alexandria, Kentucky. The KOT system was purchased from Duke Energy on February 1, 2023. The system has 52.27 miles of pipeline across four different pipelines. The focus of this request is on AM04 (11.00 miles) and AM09 (20.76 miles). TC Energy is currently in the process of completing the 2024 External Corrosion Direct Assessment (ECDA) project for the KOT AM04 and AM09 pipelines. Due to challenges with obtaining required environmental permitting, TC Energy is requesting a six-month extension to the assessment interval. Following a validation of the high consequence areas, a scope of work was developed and pre-assessment initiated. Upon receipt of the preassessment report, TC Energy retained the same vendor from the 2017 ECDA to perform the indirect inspections. The indirect inspections were deemed complete upon TC Energy's receipt of the dig selection report. The dig selection report identified nine (9) digs across five (5) ECDA regions, including two casings, resulting in a total of eleven (11) excavations (the casings are regarded as one excavation). During the permitting process, TC Energy was informed that seven of the digs were located in areas inhabited by endangered mussels, with four of these seven digs also located in warm water aquatic habitat. Two of the nine digs do not present permitting issues and were completed in 2024. It is anticipated that the environmental permit approval will be granted in February 2025 for the remaining dig locations.#