ENBRIDGE ENERGY, LIMITED PARTNERSHIP

Incident Narrative

ON FEBRUARY 21, DURING THE INITIAL FILL UPON RETURNING TANK 1607 AT THE HARTSDALE TERMINAL TO SERVICE FOLLOWING AN OUT OF SERVICE API 653 INSPECTION, OIL WAS OBSERVED COMING OUT OF THE WATER DRAW VALVE, AND OPERATIONS WERE IMMEDIATELY SHUTDOWN. IT WAS DISCOVERED THAT THE WATER DRAW VALVE WAS IN THE OPEN POSITION. AFTER ISOLATING THE RELEASE SOURCE, A CONDITIONS ASSESSMENT ENSURING THE TANK FILL OPERATIONS WERE STABLE WAS COMPLETED BY OPERATIONS PERSONNEL. ENBRIDGE RECONFIRMED THAT ALL OTHER REQUIRED PROCEDURAL STEPS WERE COMPLETED CORRECTLY. A SUPPLEMENTAL PROCEDURE WAS DEVELOPED AND APPROVED TO ACHIEVE FLOATING OF THE TANK ROOF, IN ORDER TO ENSURE A SAFE ATMOSPHERE WITHIN THE TANK DIKE TO COMMENCE CLEANUP OPERATIONS. FILL OPERATIONS WERE INITIATED IN ACCORDANCE WITH THE SUPPLEMENTAL PROCEDURE UNTIL THE TANK 1607 ROOF WAS FLOATED AND THE TANK WAS AT WORKING BOTTOMS. FURTHER INJECTIONS WERE SUSPENDED WHILE THE INCIDENT WAS INVESTIGATED FURTHER, CLEAN-UP OPERATIONS WERE COMPLETED TO A SATISFACTORY LEVEL AND OPERATIONS AND CONTROL CENTER APPROVED RETURN TO SERVICE. TANK 1607 WAS RETURNED TO SERVICE ON FEBRUARY 23. ADDITIONAL SOIL MONITORING WILL CONTINUE UNTIL THE SITE IS FULLY REMEDIATED.