COLONIAL PIPELINE CO

Incident Narrative

ON 01/07/17 AT APPROXIMATELY 14:45 EST THE ATLANTA CONTROL CENTER WAS NOTIFIED BY HAMILTON COUNTY 911 OF A SUSPECTED LEAK AT SHOAL CREEK APPROXIMATELY 2 MILES DOWNSTREAM OF SIGNAL MOUNTAIN STATION. AT 14:46 THE CONTROL CENTER INITIATED AN ORDERLY SHUTDOWN AND REMOTE ISOLATION OF BOTH LINES 19 AND 20. AT 14:53 AND 14:55, BLOCK VALVES UPSTREAM AND DOWNSTREAM WERE SHUT. THE CONTROL CENTER OPERATIONS MANAGER NOTIFIED THE DISTRICT DIRECTOR OF OPERATIONS OF THE REPORTED SHEEN AND STRONG GAS ODOR. THE DIRECTOR OF OPERATIONS NOTIFIED THE DISTRICT ENVIRONMENTAL MANAGER, DISTRICT PROJECTS LEADER AND LOCAL OPERATIONS MANAGER. THE ROW COORDINATOR ARRIVED AND CONFIRMED THE SPILL ON LINE 19 AT 16:19. SINCE THERE WERE IMPACTS TO SURFACE WATERS, THE NRC AND TDEC WERE NOTIFIED. LOCAL FIRE DEPARTMENT AND HAZMAT WERE ONSITE. LOCAL OSRO (MARION) ARRIVED ONSITE AT 19:23 AND PLACED HARD AND SOFT BOOM IN SHOAL CREEK. THE FIRE DEPARTMENT PLACED HARD BOOM AT SHOAL CREEK / TENNESSEE RIVER CONFLUENCE AT 17:50. AT NO TIME WAS PRODUCT OBSERVED ON THE TENNESSEE RIVER. THE SEGMENT OF PIPE CONTAINING THE FAILURE SOURCE WAS CUT OUT AND REPLACED ON 1/12/17 AT APPROXIMATELY 19:21 AND LINE 19 WAS RESTARTED AT APPROXIMATELY 20:00. THE CUT OUT PIPE WAS TRANSPORTED TO STRESS ENGINEERING SERVICES FOR A ROOT CAUSE FAILURE ANALYSIS. AS OF 6/16/2017 THE INVESTIGATION IS STILL UNDER WAY. UPDATE: BASED ON THE ANALYSES COMPLETED DURING THIS PROJECT, SES CONCLUDED THAT THE OBSERVED LEAK OCCURRED DUE TO A FEATURE WHICH INCLUDES A CRACK THAT WAS PRESENT WITHIN AN AREA WITH MULTIPLE COINCIDENTAL PIPELINE ANOMALIES (GOUGE, CORROSION, AND FINAL GROWTH ASSOCIATED WITH A CRACK/DENT) THAT EVENTUALLY PROPAGATED THROUGH THE PIPE WALL UNDERNEATH A SERIES OF COMPOSITE (CLOCK SPRING