ENBRIDGE ENERGY, LIMITED PARTNERSHIP

Incident Narrative

ON JANUARY 21 AT APPROXIMATELY 06:38 CST A GAUGER AT THE SUPERIOR TERMINAL WAS CONTACTED BY THE EDMONTON CONTROL CENTER TO DO A WALK AROUND ON LINE 6 DUE TO A RELIEF ACTIVE ALARM AT THE CONTROL CENTER. WHILE COMPLETING THE WALK AROUND, THE GAUGER DISCOVERED APPROXIMATELY 2 BBLS OF CRUDE OIL ON THE GROUND NEAR THE LINE 6 FIELD BOOSTER (FB) PUMP 62. LINE 6 WAS IMMEDIATELY SHUT DOWN AND TERMINAL AND PIPELINE MAINTENANCE PERSONNEL WERE DISPATCHED TO THE RELEASE AREA. IN ANOTHER UNRELATED EVENT ON JANUARY 20 AT 21:00 CST THE LINE 6 FB 62 HAD BEEN LOCKED OUT DUE TO A BOOSTER PUMP LOCKOUT ALARM EXPERIENCED AT THE CONTROL CENTER. WHEN THE PUMP LOCKED OUT, THE GAUGER WAS CONTACTED TO INSPECT THE AREA. THERE WERE NO VISIBLE SIGNS OF A LEAK, SO IT WAS DETERMINED TO LEAVE THE UNIT LOCKED OUT UNTIL A TECHNICIAN COULD EVALUATE IT FIRST THING IN THE MORNING. THE OTHER TWO UNITS WERE ABLE TO RUN AND LINE 6 COULD CONTINUE TO OPERATE. AFTER FURTHER INVESTIGATION THE NEXT MORNING OIL WAS DISCOVERED, IT WAS DETERMINED THAT THE SEAL ON FB 62 HAD FAILED. DUE TO PRESSURE SWINGS FROM 75-210 PSI ON THE SUCTION SIDE OF THE PUMP, DEBRIS WAS ABLE TO GET LODGED BETWEEN THE MECHANICAL SEAL'S PRIMARY FACES HOLDING THEM OPEN, ALLOWING OIL TO FLOW BETWEEN THEM AND OUT OF THE SYSTEM. THE SEAL WAS REPLACED, THE PUMP PLACED BACK INTO SERVICE AND THE LINE RESTARTED LATER THAT MORNING. APPROXIMATELY 45 CUBIC YARDS OF CONTAMINATED SOIL HAS BEEN HAULED TO AN APPROVED LANDFILL.