MAGELLAN PIPELINE COMPANY, LP

Incident Narrative

MAGELLAN PERSONNEL ON A STATION CHECK AT MIDDLEBURY JUNCTION DISCOVERED STAINED SNOW IN THE AREA SURROUNDING THE MANIFOLD. DIESEL FUEL WAS FOUND TO BE DRIPPING FROM A GASKET IN THE AREA OF A FLANGE/DENSITOMETER. THE LINE WAS NOT RUNNING AT THE TIME AFTER COMPLETING A SHIPMENT SEVERAL DAYS BEFORE. THE SECTION OF PIPE WHERE THE RELEASE OCCURRED WAS BLOCKED IN BY THREE CLOSED VALVES AND DID NOT HAVE A THERMAL RELIEF VALVE INSTALLED. NO PRESSURE GAUGE WAS PRESENT. HOWEVER, WHILE THE LINE WAS BLOCKED IN, IT IS THOUGHT THAT PRESSURE BUILD-UP EXCEEDED 110% OF MOP, RESULTING IN THE RELEASE. A THERMAL RELIEF WAS INSTALLED AND THE DAMAGED GASKET WAS SUBSEQUENTLY REPLACED ALONG WITH THE STUD BOLTS AND NUTS. APPROXIMATELY 50 CUBIC YARDS OF SOIL WAS EXCAVATED DURING HAND AND MECHANIZED CLEAN-UP ACTIVITIES AND WAS CONTAINERIZED IN TWO ROLL OFF CONTAINERS. IMPACTED SNOW WAS CONTAINERIZED IN AN OPEN TOP FRAC TANK. SNOW MELTED WITH HOT WATER TRUCKED IN BY A VACUUM TANKER TRUCK THEN HAULED BY SAME TRUCK TO RECLAMATION FACILITY- APPROXIMATE WATER CONTENT OF MELTED SNOW ~5,000 GALLONS. THIS SUPPLEMENTAL-FINAL REPORT WAS FILED TO UPDATE EMERGENCY RESPONSE COSTS IN PART D.