ENBRIDGE ENERGY, LIMITED PARTNERSHIP

Incident Narrative

AT APPROXIMATELY 08:35, A CONTRACTOR CREW AT MOKENA STATION DISCOVERED A RELEASE ON LINE 14 FROM A FLEX HOSE OFF OF A 2"" TAKE-OFF FEEDING PRESSURE TRANSMITTERS DOWNSTREAM OF THE PRESSURE CONTROL VALVE. CCO WAS NOTIFIED IMMEDIATELY AND INITIATED SHUTDOWN OF LINE 6 AND LINE 14. THE SHUTDOWN AND ISOLATION OF L-14 WAS COMPLETED AT 08:49, AND LINE 6 SHUTDOWN AND ISOLATION WAS COMPLETED AT 08:57. AT 08:54, THE ON-CALL MANAGER WAS NOTIFIED AND AT 09:14, THE STATION TECHNICIAN CONFIRMED THE RELEASE ON LINE 14. LINE 6 WAS RESTARTED AT 09:52 FOLLOWING THE CONFIRMATION. MECHANICAL TECHNICIANS WERE NOTIFIED TO INITIATE CORRECTIVE ACTION. THE VOLUME OUT WAS ESTIMATED TO BE 4 GALLONS AND CLEAN UP BEGAN BY ZIRON ENVIRONMENTAL SERVICES AND PLM AT 10:25. DURING CLEANUP, THE CONTRACTOR IDENTIFIED PENETRATED SOIL BELOW THE RELEASE AND BEGAN POT-HOLING A PERIMETER TO DETERMINE THE EXTENT OF THE RELEASE. IT WAS FOUND THAT THE IMPACTED AREA REACHED A MINIMUM OF A 10 FOOT RADIUS AROUND THE RELEASE SITE. ON-CALL MANAGER WAS NOTIFIED OF THE INCREASE IN EXTENT AT 11:25 BY STATION TECHNICIAN. SUBSEQUENTLY, THE VOLUME WAS ESTIMATED AT APPROXIMATELY 1 BBL AND THE NRC WAS NOTIFIED AT 12:23 (REPORT # 1096796). THE DAMAGED FLEX HOSE WAS REPLACED WITH HARD PIPING AND LINE 14 WAS RESTARTED AT 13:05. APPROXIMATELY 265 TONS OF CONTAMINATED SOIL WAS DISPOSED OF AT AN APPROVED SITE. BASED ON DISPOSAL VOLUMES THE FINAL ESTIMATE WAS CALCULATED AT 21.38095 BARRELS RELEASED.