"SUNOCO, LLC"

Incident Narrative

"ON 3/3/2025, SUNOCO PERSONNEL DISCOVERED A JET FUEL LEAK AT MAINLINE VALVE BOX #2 AT 11:45 EST, WHICH WAS INITIALLY ESTIMATED TO BE 70 GALLONS. IN RESPONSE TO SUNOCO'S DISCOVERY, THE PRESSURE ON THE PIPELINE WAS RELIEVED TO TANK 2001. ALL MAINLINE VALVES WERE CLOSED AND THE LINE SEGMENT ISOLATED. SUNOCO CONTACTED THE OSRO (HEPACO) AT 12:03 EST. THE PRELIMINARY LEAK INVESTIGATION SUGGESTED THAT THE GASKET ON THE FLANGE WITHIN VALVE BOX #2 MAY HAVE CAUSED THE DISCOVERED RELEASE. UPON REPLACING THAT VALVE, HOWEVER, SUNOCO PERSONNEL STILL OBSERVED PRODUCT NORTH OF VALVE BOX #2 AND, AS SUCH, COMPLETED AN INVESTIGATION ON THE PIPE UNDERNEATH DAM NECK ROAD. AT A LATER DATE, SUNOCO ALSO DETERMINED THAT THE RECTIFIER HAD A REVERSED POLARITY. SUNOCO CONSEQUENTLY DETERMINED THAT THE PIPELINE SEGMENT UNDERNEATH THE ROAD MAY INCLUDE SOME CORROSION ABNORMALITIES AND, AS SUCH, SENT IT FOR METALLURGICAL TESTING. AS OF APRIL 2, SUNOCO HAS NOT RECEIVED THOSE RESULTS. UPDATE: PIPELINE HAS BEEN RESTARTED AS REPORTED IN PART A. ESTIMATED COST OF OPERATOR'S EMERGENCY RESPONSE INCREASED AS REPORTED IN PART D. PART G UPDATED, PENDING METALLURGICAL ANALYSIS WITH ESTIMATED DATE OF COMPLETION 6/30/2025. UPDATE: FAILURE ANALYSIS DETERMINED THAT EXTERNAL CORROSION CAUSED BY REVERSED POLARITY IN THE CATHODIC PROTECTION SYSTEM LED TO THROUGH-WALL LEAKS IN PIPELINE SEGMENT. NO MECHANICAL DAMAGE OR MATERIAL DEFECTS WERE FOUND."