ENBRIDGE ENERGY, LIMITED PARTNERSHIP

Incident Narrative

WHILE PERFORMING A PLANNED INTEGRITY ASSESSMENT DIG, TRACES OF OIL AND STAINED SOIL/ROCK WERE NOTICED AROUND THE PIPELINE AND THE PIPELINE WAS SHUTDOWN AS A PRECAUTION. AFTER FURTHER INVESTIGATION IT WAS DISCOVERED THAT THE PIPELINE WAS RESTING ON A SMALL ROCK. A SMALL CRACK FORMED IN THE DENT AREA AND A SMALL AMOUNT OF CRUDE HAD WEEPED THROUGH THE CRACK-LIKE DEFECT (LESS THAN 5 GALLONS). THE ENBRIDGE PIPELINE MAINTENANCE CREW REPAIRED THE DAMAGED PIPE USING A FULL ENCIRCLEMENT PRESSURE CONTAINING SLEEVE. ON 6/12/10, DURING SITE RESTORATION CONTRACT CREWS DISCOVERED SOME ADDITIONAL CRUDE OIL NEAR THE ORIGINAL AREA OF THE LEAK (APPROXIMATELY 1 BARREL). AS SUCH, ENBRIDGE CONTACTED THE NRC (PHMSA AND WDNR), AS THE VOLUME RELEASED REACHED NOTIFICATION/REPORTING QUANTITY. CONTAMINATED SOIL HAS BEEN REMOVED AND DISPOSED AT AN APPROVED LANDFILL LOCATION AND ENBRIDGE ENVIRONMENTAL DEPARTMENT IS PLANNING A SOIL AND GROUNDWATER INVESTIGATION PROGRAM TO DETERMINE IF ADDITIONAL IMPACTS EXIST. BASED ON THE ENVIRONMENTAL INVESTIGATION GROUNDWATER IMPACTS APPEAR TO BE LOCALIZED. GROUNDWATER MONITORING PROGRAM HAS BEEN DEVELOPED AND AGREED UPON WITH STATE ENVIRONMENTAL REGULATORS. UPDATE APPROXIMATELY 400 CUBIC YARDS OF CONTAMINATED SOIL WAS REMOVED FROM RELEASE SITE AND DISPOSED AT AN APPROVED LANDFILL. ENBRIDGE ENVIRONMENTAL DEPARTMENT IS COMPLETING QUARTERLY GROUNDWATER MONITORING WITH POSSIBLE SITE REGULATORY CLOSURE IN LATE 2014.