MAGELLAN PIPELINE COMPANY, LP

Incident Narrative

WHILE DRAINING THE PIPELINE THROUGH THE PIG LAUNCHER DRAIN, LOCAL OPERATIONS NOTICED A STAIN APPEAR IN THE SOIL A FEW FEET AWAY. PRODUCT DRAINING WAS IMMEDIATELY STOPPED AND THE LINE WAS ISOLATED TO BEGIN INVESTIGATION. DURING EXCAVATION OF IMPACTED SOILS, A 1.5 INCH DRAIN LINE WAS DISCOVERED THAT WAS NEITHER EXPOSED NOR TOUCHED DURING THE RECENT TIE-IN PROJECT AND WAS ALSO NOT IDENTIFIED ON TERMINAL DRAWINGS. IT APPEARED THIS LINE WAS STILL TIED INTO THE TERMINAL NETWORK OF DRAIN LINES THAT EVENTUALLY TIED INTO THE SUMP. FURTHER INVESTIGATION INDICATED THAT THE PIPE/DRAIN LINE WAS LEFT UNCAPPED AND NOT ISOLATED FROM THE ACTIVE SUMP LINES. BASED ON THE ELEVATION OF THE DRAIN LINE ON THE PROPERTY, AND THE TYPICAL FLOW THROUGH THE DRAIN LINES, THIS UN-CAPPED DRAIN LINE HAD NOT BEEN DISCOVERED PREVIOUSLY. IT IS BELIEVED THAT A PREVIOUS OWNER-OPERATOR FROM WHOM MAGELLAN ACQUIRED THE SYSTEM IN 2013 DISCONNECTED THIS SEGMENT FROM OTHER DRAIN LINES, LEAVING THE END UNPLUGGED. OPERATIONS CAPPED THIS PIPE THEN APPLIED NITROGEN, ALLOWING THEM TO CONFIRM THE LEAK SOURCE WAS MITIGATED. PART E, QUESTIONS 1 AND 2 ARE ESTIMATES BASED ON THE FACT THAT THE PIPING IS ALL THREADED AND LIKELY NOT TESTED TO A PRESSURE MORE THAN 100 PSIG WHEN ORIGINALLY INSTALLED SINCE IT IS AN ATMOSPHERIC DRAIN SYSTEM. THE PRESSURE AT THE RELEASE SOURCE IS ESTIMATED TO BE 0 PSIG SINCE THE LOCATION WAS UN-CAPPED. APPROXIMATELY 0.54_ CUBIC YARDS OF IMPACTED SOIL WAS REMEDIATED.