"On April 26, 2010, Williams Gas Pipelines -- Transco (Transco, the Operator) reported to the NRC (No. 938267) a leak on their 24-inch 'A Pipeline' near Kingsville, TX. A pipeline technician assigned to take annual cathodic protection readings initially observed bubbles in standing water on the pipeline right-of-way on April 22, 2010. The area is crisscrossed with crude oil gathering pipelines and Operator personnel were initially unsure that the release was from the Transco pipeline. After discovery, production supplying the 'A Pipeline' was shut-in and the valve segment isolated. Excavation revealed that the release was occurring from a small external corrosion anomaly located on the pipeline at approximately the 5 o'clock position. Additional isolated corrosion pits in the segment near the leak site required the Operator to replace approximately 30 feet of 24-inch pipe to accomplish the repair."
Pipeline and Hazardous Materials Safety Administration: http://phmsa.dot.gov/