MAGELLAN PIPELINE COMPANY, LP

Incident Narrative

LOCAL OPERATIONS PERSONNEL OBSERVED PRODUCT OVERFLOWING THE SUMP AT DULUTH STATION. OPERATIONS CONTROL WAS NOTIFIED, THE STATION WAS ISOLATED, AND PIPELINE SHUTDOWN PROCEDURES WERE INITIATED. UPON DISCOVERY OF THE OVERFILL, THE SUMP PUMP WAS STARTED WHICH STOPPED ADDITIONAL PRODUCT FROM RELEASING TO THE GROUND. FURTHER SITE INVESTIGATIONS REVEALED THE PRODUCT HAD MIGRATED OFF THE FACILITY PROPERTY. DAMS WERE BUILT TO CONTROL THE EXTENT OF THE RELEASE. FREE PRODUCT WAS COLLECTED AND IMPACTED SOIL WAS EXCAVATED AND PROPERLY DISPOSED. PRIOR TO THE RELEASE, CLEANING PIG OPERATIONS WERE BEING CONDUCTED ON THE MAINLINE. LOCAL PERSONNEL WERE ALIGNING VALVES AT THE FACILITY IN PREPARATION TO RECEIVE THE CLEANING PIG. A BODY RELIEF NEEDLE VALVE LOCATED ON THE PROVER BYPASS VALVE WAS LEFT OPEN WHICH ALLOWED PRODUCT TO FLOW TO THE SUMP. ADDITIONALLY, SUMP ALARMS WERE PLACED IN 'TEST' MODE FOR THE DURATION OF THE PIG RECEIVING ACTIVITIES WHICH MASKED SUMP EMERGENCY HIGH LEVEL ALARMS. THE OPERATOR CHECKED THE SUMP FLOAT STICK AND CONFIRMED IT WAS AT ""NORMAL BOTTOM"" HOWEVER, THE SUMP FLOAT STICK WAS STUCK IN THE 'NORMAL BOTTOM' POSITION AND WAS NOT READING CORRECTLY. CORRECTIVE ACTIONS INCLUDE: REPAIR OR REPLACEMENT OF THE FLOAT AND SUMP STICK; NEEDLE VALVE HAS BEEN CLOSED AND COLOR-TIED IN THE CLOSED POSITION. ADDITIONALLY, LESSONS LEARNED BULLETINS WILL BE COMMUNICATED CONCERNING FLOAT AND SUMP STICK OCCASIONALLY HANGING UP AND NEEDLE VALVES MUST BE SEALED CLOSED. 48-HOUR NRC UPDATE: #1241727, 4/3/19 08:50