MAGELLAN AMMONIA PIPELINE, L.P.

Incident Narrative

AT 8:36AM ON JULY 1, 2019, LOCATION OPERATIONS PERSONNEL WAS NOTIFIED BY AERIAL PATROL OF AN AREA OF DEAD VEGETATION NEAR MP 225.3 ON THE NH3 GARNER LATERAL 6"" LINE SEGMENT. FIELD PERSONNEL WERE DISPATCHED TO THE SITE TO BEGIN INVESTIGATIONS. OPERATIONS CONTROL WAS NOTIFIED AND PIPELINE SHUTDOWN PROCEDURES WERE INITIATED. AT THE TIME OF THE EVENT, THE PIPELINE WAS NOT RUNNING. INVESTIGATIVE EVENT PROCEDURES WERE IMPLEMENTED AND ADDITIONAL RESOURCES RESPONDED TO THE SITE. MANUAL MAINLINE ISOLATION VALVES WERE CLOSED TO ISOLATE THE RELEASE SEGMENT. HEAVY RAINS AND LIGHTNING ON JULY 1 AND JULY 2 AFFECTED SITE CONDITIONS AND THE ABILITY TO SAFELY EXCAVATE AND PERFORM EMERGENCY RESPONSE ACTIVITIES. NO VAPOR CLOUDS OR RELEASE TO THE AIR WERE DETECTED. AIR MONITORING WAS CONDUCTED AFTER THE RAIN EVENT AND THROUGHOUT THE RESPONSE AND REPAIR ACTIVITIES. AIR MONITOR READINGS WERE ZERO WITH NO DETECTABLE ODOR. THE RELEASE LOCATION WAS FULLY EXCAVATED ON JULY 3. THE RELEASE ORIGINATED FROM THE FILLET WELD ON THE NUT OF A PLIDCO REPAIR SLEEVE THAT WAS INSTALLED IN 2012. APPARENTLY DURING THE 2012 REPAIR, THE FILLET WELD AROUND THE NUT WAS INCOMPLETE. THE FILLET WELDS WERE INSPECTED DURING THE 2012 REPAIR WITH NO FINDINGS NOTED. A WELD REPAIR WAS PERFORMED ON THE DEFECTIVE FILLET WELD TO REPAIR THE RELEASE. THE WELD REPAIR WAS MAG PARTICLE TESTED AND THE LINE WAS RETURNED TO SERVICE. 48-HR NRC UPDATE: 1250879 7/3/2019 13:54 SUPPLEMENTAL/FINAL (10/29/2019): UPDATED PART A 9 AND 11 VOLUME RELEASED/RECOVERED SUPPLEMENTAL/FINAL (12/19/2019): UPDATED PART G7