MAGELLAN PIPELINE COMPANY, LP

Incident Narrative

ON JANUARY 16, 2017 A THIRD PARTY CONTRACTOR WORKING FOR MAGELLAN WAS GAUGING A REMEDIATION WELL LOCATED ON THE PROPERTY AT THE CHEYENNE TERMINAL AND NOTED PRODUCT WAS FLOATING ON TOP OF THE WELL GROUNDWATER. THE MAINLINE OPERATIONS WERE SHUT DOWN AND AN INVESTIGATION WAS INITIATED TO LOCATE THE SOURCE OF THE RELEASE. ON JANUARY 19, AFTER PERFORMING PRESSURE TESTS THROUGHOUT THE FACILITY, THE LEAK SOURCE WAS IDENTIFIED ON A DEAD LEG SECTION OF PIPE. THIS DEAD LEG SECTION OF PIPE HAD THOUGHT TO HAVE BEEN INACTIVATED AND ISOLATED BY THE PREVIOUS OWNERSHIP OF THE FACILITY. CONSTRUCTION ACTIVITIES AT THE TERMINAL IN SEPTEMBER 2016 MODIFIED THE END FLANGE OF THE DEAD LEG PIPE PRIOR TO BURYING. THE LEAK SOURCE WAS DISCONNECTED FROM THE ACTIVE LINES AT THE FACILITY AND LONG TERM SOIL REMEDIATION EFFORTS INITIATED. THE ANSWER IN PART E2 WAS BASED ON THE ANSI RATINGS OF THE FLANGES INSTALLED ON THE DEAD LEG SECTION OF PIPE. RELEASE IS CURRENTLY IN LONG TERM REMEDIATION. THE WDEQ HAS TAKEN CONTROL OF THE MONITORING OF THIS INCIDENT. APPROXIMATELY 13 CUBIC YARDS OF SOIL HAS BEEN REMEDIATED. SUPPLEMENTAL/FINAL UPDATE: PART A 11 (VOLUME OF COMMODITY RECOVERED), PART D 8E (OPERATOR'S ENVIRONMENTAL REMEDIATION) AND PART H (NARRATIVE).