ENBRIDGE ENERGY, LIMITED PARTNERSHIP

Incident Narrative

ON MONDAY, APRIL 4, 2011 SUPERIOR TERMINAL AND PLM PERSONNEL BEGAN INVESTIGATING A SHOW OF OIL NEAR VALVE 221-V-SP1 WHICH IS LOCATED IN THE ROAD DITCH OUTSIDE THE SE CORNER OF THE TANK 8 BERM. AT THE TIME OF THE DISCOVERY THE VOLUME AND EXPECTED COSTS TO MANAGE THE LEAK WAS ANTICIPATED TO BE LESS THAN $50,000. ON APRIL 8 IT WAS DETERMINED THAT TO FULLY INVESTIGATE AND REMEDIATE THE CAUSE OF THE LEAK, AND SPECIFICALLY DUE TO THE CONSTRAINTS ASSOCIATED WITH EXCAVATION AREA (SHEET PILLING WAS NECESSARY TO MAKE THE AREA SAFE FOR FURTHER INVESTIGATION), IT WAS VERY LIKELY THAT THE $50,000 REPORTABILITY THRESHOLD WOULD BE EXCEEDED, AND THEREFORE THE NRC WAS NOTIFIED AT THIS TIME. AFTER FURTHER INVESTIGATION, A PENCIL SIZED CORROSION HOLE WAS DISCOVERED AT THE 6 O'CLOCK POSITION OF THE PIPE. THE PIPE WAS TEMPORARILY REPAIRED WITH A PLIDCO SPLIT + SLEEVE AND THE PERMANENT REPAIR WILL BE A PIPE REPLACEMENT WHICH IS SCHEDULED FOR END OF Q2 2011. THIS REPLACEMENT SECTION OF PIPE WILL BE REDESIGNED TO ELIMINATE THE ""DEAD LEG"" AREA WHERE THE LEAK OCCURRED.