ENBRIDGE PIPELINES (NORTH DAKOTA) LLC

Incident Narrative

"ON NOVEMBER 13, 2012 A RELEASE WAS DISCOVERED WITHIN THE BERMED AREA OF MINOT TANK 6006. THE RELEASE WAS IDENTIFIED DURING A DAILY INSPECTION BY OPERATION PERSONNEL. THE CONTROL CENTER WAS IMMEDIATELY NOTIFIED, THE PIPING WAS ISOLATED, AND REMEDIAL ACTIONS BEGAN. THE RELEASE LOCATION WAS IN THE 6 O'CLOCK ORIENTATION ON THE TANK 6006 TANK SUCTION/DISCHARGE LINE. A PLIDCO SLEEVE WAS INSTALLED ONTO THE PIPE TO CONTAIN THE RELEASE AND FACILITATE RECOVERY AND CLEAN-UP ACTIVITIES. A 5 FOOT 5-1/2 INCH LONG PIPE SEGMENT WAS CUT OUT FOR A MORE THOROUGH INVESTIGATION. AT THE TIME THE RELEASE WAS DISCOVERED, THE PIPELINE WAS ALREADY SHUT DOWN FOR A PLC UPGRADE AND THEREFORE QUESTION #14B. IN PART A WAS ANSWERED AS NO - THE FACILITY WAS NOT SHUTDOWN DUE TO THE RELEASE. OIL WAS DISCOVERED WITHIN THE BERMED AREA OF TANK 6006 DURING A DAILY INSPECTION AT 08:35 (CST). THE PIPELINE WAS RESTARTED ON 11/14/12 AT 23:40 WITH PHMSA'S APPROVAL OF THE RESTART PLAN. THE EMERGENCY RESPONSE PROCESS OPERATED UNDER ICS AND WAS DOCUMENTED WITH AN ICS 201 PACKET AND CONTINUED WITH THE CREATION OF INCIDENT ACTION PLANS. A FEASIBILITY ANALYSIS WAS COMPLETED AND EXCAVATION WAS CHOSEN AS THE BEST METHOD FOR CLEANUP. A TOTAL OF 3,206 GALLONS OF OIL WAS RELEASED (ESTIMATED AMOUNTS OF RELEASED OIL INCLUDED ADDITIONAL BARRELS CAPTURED DURING DRAIN DOWN OF THE PIPING) AND A TOTAL 3,252 TONS OF SOIL WAS CONTAMINATED AND DISPOSED OF AT THE SAWYER LANDFILL DAKOTA. THE CONTAMINATED AREA WAS CONTAINED TO 40 FEET ON EITHER SIDE OF THE PIPE AND THERE ARE NO FURTHER RISKS TO HUMAN HEALTH OR THE ENVIRONMENT AT THIS LOCATION. RECOVERY AND CLEAN-UP EFFORTS WERE COMPLETED IN JANUARY 2013. A THIRD PARTY WAS RETAINED TO CONDUCT A METALLURGICAL ASSESSMENT OF THE FAILED PIPING AS WELL AS A ROOT CAUSE INVESTIGATION. THE METALLURGICAL ASSESSMENT DETERMINED THE CAUSE WAS INTERNAL CORROSION, LIKELY CAUSED BY MICROBIOLOGICALLY INFLUENCED CORROSION. NO OTHER AREAS OF INTERNAL OR EXTERNAL CORROSION WERE NOTED IN THE REMOVED SEGMENT, CHEMICAL ANALYSIS OF RESIDUE ALONG THE 6 O'CLOCK ORIENTATION OF THE PIPE WAS POSITIVE FOR CHLORIDES, AND TESTING INDICATED THE PIPE MET ALL REQUIREMENTS OF API 5L GRADE B AND API 5LX GRADE X46 PIPE AT THE TIME OF MANUFACTURE."