SOUTH BOW INFRASTRUCTURE OPERATIONS INC. — Integrity Assurance Notification

REPAIRIn compliance with 195.452(h)(3) Schedule for Evaluation and Remediation, South Bow Infrastructure Operations Inc (OPID 32334) hereby notifies of its inability to evaluate and remediate a 60-day condition on or before January 20 due to the adverse effects of Winter Storms Blair, Cora and the recent extreme cold. Initially, the anomaly was scheduled for evaluation on January 16. However, due to road closures, power outages, and general safety concerns regarding the mobilization of project personnel and equipment, the evaluation is now estimated to be conducted on January 27. The anomaly in question meets the 60-day condition criteria—a dent on the pipeline bottom with signs of metal loss, cracking, or a stress riser, and is named as KS9 GWD 145590. The dent was identified in a 2024 NDT UTWM/UG tool run in the KS9 section of the Keystone Pipeline between Salisbury, Missouri and Patoka, Illinois. The exact location of the anomaly and excavation site has GPS coordinates of 38.995807, -91.081862, in Lincoln County west of Troy, Missouri. The delay in evaluation and remediation, extending beyond the required 60 days, does not compromise public safety or environmental protection. No metal-loss features were found to interact with this dent according to the UTWM portion of the 2024 NDT UTWM/UG tool run in KS9. This feature was selected for excavation based on interaction with metal-loss features identified during a 2019 MFL4 tool run inspection. The absence of interacting metal-loss features in 2024 suggests that they are not of significant severity or near-term concern. Additionally, no interacting cracks were reported in relation to this dent based on prior axial and circumferential crack ILI tool runs. Furthermore, the target features for this excavation are located on heavy wall pipe (0.515”), providing an additional margin of safety. The current estimate for completing the evaluation of the anomaly is January 27. Should the evaluation indicate that no remediation is necessary, the pipe will be re-coated within two days. If remediation is required, an appropriate circumferential repair will be installed in the following 5 days. Regardless of the outcome, you will be informed of the evaluation results.#