"ENBRIDGE ENERGY, LIMITED PARTNERSHIP"

Incident Narrative

"ON JANUARY 9, 2025, AT 8:58 AM CST, LOCAL OPERATIONS AT GRIFFITH TERMINAL DISCOVERED A RELEASE OF CRUDE OIL THAT HAD FLOODED THE EXTERNAL FLOATING ROOF OF TANK 72. APPROXIMATELY 3,900 BARRELS OF CRUDE OIL WAS RELEASED AND CONTAINED TO THE TANK ROOF. THE EDMONTON CONTROL CENTER WAS NOTIFIED AND STARTED PUMPING DOWN THE TANK. OPERATIONS BEGAN TO PUMP OIL OFF OF THE ROOF. THE SOURCE OF THE RELEASE WAS IDENTIFIED AS A TEAR IN THE ROOF SURFACE. NRC CRITERIA WAS DETERMINED TO BE MET AT 14:15 CDT DUE TO THE COST OF CLEANUP AND REPAIRS EXCEEDING THE $50,000 NRC THRESHOLD. THE NRC WAS NOTIFIED AT 15:21 CDT (NRC# 1420751). A 48-HOUR UPDATE TO THE NRC WAS MADE ON JANUARY 11, 2025, AT 13:08 CDT (NRC# 1420873). OPERATIONS SUCCESSFULLY REMOVED THE ROLLING LADDER AND LANDED THE ROOF, ALLOWING THE REMAINING RELEASED PRODUCT TO DRAIN BACK INTO THE TANK THROUGH THE TEAR. THE TANK ROOF WAS THEN CLEANED, AND THE TEAR WAS PATCHED. THE TANK WAS SUBSEQUENTLY PLACED BACK INTO SERVICE. ANALYSIS OF THE EVENT DETERMINED THE CAUSE OF THE RELEASE TO BE A FAILURE OF MECHANICAL EQUIPMENT ON THE ROLLING LADDER. A PREVIOUS THIRD-PARTY REPAIR MADE TO THE ROLLING LADDER HAD INSTALLED AN INCORRECT AXLE, WHICH WAS NOT DETECTED DURING THE INSPECTION PROCESS. THE ROLLING LADDER TRACK WAS ALSO BOWED, WHICH WAS NOT TAKEN INTO ACCOUNT. THESE FACTORS ALLOWED FOR AXIAL MOVEMENT OVER TIME, LEADING TO THE ROLLING LADDER EVENTUALLY COMING OFF TRACK AND PUNCTURING THE ROOF."