ENBRIDGE ENERGY, LIMITED PARTNERSHIP

Incident Narrative

AT APPROXIMATELY 1:30 PM CENTRAL TIME ON JULY 29TH, A CASS LAKE TECHNICIAN NOTICED OIL ON THE GROUND NEAR UNIT 2.3 INSIDE THE N CASS LAKE STATION PROPERTY. THE ENBRIDGE CONTROL CENTER WAS CONTACTED, THE PUMPING UNITS SHUT DOWN, AND FLOW REDIRECTED TO BYPASS THE STATION IN ORDER TO ISOLATE THE LOCATION WHERE APPROXIMATELY 2 BARRELS OF OIL HAD LEAKED. BEMIDJI EMERGENCY RESPONSE CREWS WERE MOBILIZED TO INVESTIGATE, CONTAIN AND CLEAN UP THE AFFECTED AREA. THE CREW EXCAVATED THE IMPACTED AREA AND DISCOVERED THE SOURCE OF THE LEAK TO BE A FLANGE ON THE SUCTION SIDE OF THE UNIT 2.3 DISCHARGE VALVE. THE FLANGE WAS RE-TORQUED PER THE COMPANY'S O&MP PROCEDURES. PUMPING UNIT 2.3 WAS RESTARTED WHILE ONSITE PERSONNEL REMAINED FOR ADDITIONAL OBSERVATION. ONSITE PERSONNEL CONFIRMED THAT NO FURTHER LEAKAGE OCCURRED. THE INCIDENT WAS REPORTED TO THE MN DUTY OFFICER. AT THE TIME THE LEAK WAS DISCOVERED, CLEANUP COSTS WERE NOT EXPECTED TO REACH $50,000. ONCE THE COSTS WERE ESTIMATED TO EXCEED THE $50,000, ENBRIDGE CONTACTED THE NRC. AN ENVIRONMENTAL CONSULTANT WILL SAMPLE THE SOIL AROUND THE VALVE AREA TO ENSURE ALL OF THE CONTAMINATED SOIL HAS BEEN REMOVED. THE CONTAMINATED SOIL WILL BE TAKEN OFF SITE AND PROPERLY DISPOSED AT AN APPROVED LOCATION. SEE ATTACHED UPLOADED FILE, JANUARY 2012 NARRATIVE.