ENBRIDGE PIPELINES (NORTH DAKOTA) LLC

Incident Narrative

DURING AN INTEGRITY DIG, CONTRACTOR CREWS SMELLED AN ODOR AND DISCOVERED DISCOLORED SOIL (09:44 A.M.). THE CONTROL CENTER WAS CONTACTED TO SHUT DOWN THE LINE. THE LINE WAS SHUT DOWN AT 09:58 A.M. EMPLOYEES CONFIRMED RELEASE AT 11:30 A.M. AFTER EXPOSING THE PIPE. NOTIFICATION TO THE NRC WAS MADE WITHIN AN HOUR (12:07 P.M.) OF THE CONFIRMATION TIME (11:30 A.M.). THE EMERGENCY RESPONSE PROCESS OPERATED UNDER ICS AND WAS DOCUMENTED WITH AN ICS 201 PACKET. ENBRIDGE ENVIRONMENT AND SAFETY WORKED TO ENSURE SAFETY OF RESPONSE AND COMPLIANCE WITH SPILL RESPONSE REGULATIONS. CONTRACTORS ON SITE FOR THE INTEGRITY WORK WERE UTILIZED TO ASSIST ENBRIDGE RESPONDERS WITH PRODUCT CLEAN UP AND PIPELINE REPAIR. REPAIR WAS COMPLETED BY INSTALLING A PIPELINE SLEEVE LOCATED WHERE THE ILI TOOL INDICATED AS PREDETERMINED BY THE INTEGRITY DIG PROGRAM. RELEASE WAS ESTIMATED AT 1 BARREL. 20 CUBIC YARDS OF CONTAMINATED SOIL WAS HAULED TO AN APPROVED DISPOSAL FACILITY. BASED ON THE IN-LINE INSPECTION CRACK TOOL RUN ON LINE 81, AN ANOMALY WAS DETECTED AS A CRACK-LIKE FEATURE, 0.080-0.120 INCHES DEEP AND 1.4 INCHES LONG ADJACENT TO THE LONG SEAM WELD. THE ANOMALY WAS CONFIRMED TO BE A CRACK IN THE LONG SEAM WELD WHICH WAS SEEPING, THROUGH WALL AND 1.1 INCHES LONG. THE FEATURE WAS ASSESSED USING NDE AND WAS SLEEVED. REPAIR COSTS REFLECT A GOOD FAITH ESTIMATE EXTRACTED FROM THE TOTAL INTEGRITY DIG COSTS AS REQUESTED BY PHMSA AND AGREED TO POST RELEASE. OUR ACCOUNTING STRUCTURE AT THE TIME OF THIS RELEASE WAS NOT SET UP TO SEPARATE REPAIR COSTS FROM TOTAL DIG PROJECT COSTS.