MARATHON PIPE LINE LLC

Incident Narrative

ON MARCH 11, 2022, THE WOODPAT 22"" CRUDE SYSTEM WAS RUNNING STEADY STATE FROM WOOD RIVER TANKAGE DELIVERING TO PATOKA TANKAGE. AT 8:15 AM CST THE ROXANA UNIT 3 SHUTDOWN ON LOW SUCTION. FIELD OPERATIONS CONFIRMED A MAINLINE RELEASE AT 9:50 AM CST. A CALL TO THE NATIONAL RESPONSE CENTER (NRC) WAS MADE AT 10:15AM CST. THE LEAK POINT WAS LOCATED 6 MILES DOWNSTREAM OF ROXANA STATION WHERE THE PIPELINE RUNS ADJACENT TO CAHOKIA CREEK. ON MARCH 13, 2022 AT 8:46 AM CDT, A CALL WAS MADE TO THE NRC TO PROVIDE THE REQUIRED 48-HOUR UPDATE. THE OPERATOR AT THE NATIONAL RESPONSE CENTER STATED DUE TO THE NUMBER OF AGENCIES ALERTED BECAUSE OF THE VOLUME RELEASED, NO NEW NRC REPORTS WOULD BE TAKEN. ALL UPDATES NEED TO BE PROVIDED DIRECTLY TO FEDERAL ON-SCENE COORDINATOR. PER DIRECTION FROM THE ONSITE PHMSA PERSONNEL, A SECOND ATTEMPT AT THE 48-HOUR NOTIFICATION WAS COMPLETED AT 5:03 PM CDT. NRC 48-HOUR UPDATE: #1330949 UPDATED PART A, PART D, PART E AND PART G FOR THIS SUPPLEMENTAL REPORT. UPDATED 4/22/22: THE CURRENT ESTIMATION OF PRODUCT RELEASED IS 3,500 BARRELS. TO DATE, RECOVERED PRODUCT IS ESTIMATED AT 2,974 BARRELS; HOWEVER, RECOVERY IS ONGOING AND WILL BE FURTHER UPDATED AS MORE INFORMATION BECOMES AVAILABLE. THE NATIONAL TRANSPORTATION SAFETY BOARD (NTSB) IS LEADING THE INVESTIGATION INTO THE CAUSE OF THE FAILURE, AND IT IS ONGOING. FUTURE INVESTIGATIVE ACTIVITY WILL FOCUS ON GEOHAZARD MANAGEMENT, METALLURGY, COMPARING THE FORCES EXERTED ON THE PIPELINE TO ITS ABILITY TO WITHSTAND STRAIN, AND THE ONGOING ENVIRONMENTAL RESPONSE. UPDATE 02/07/2024: MARKED AS FINAL. RECOVERED VOLUME UPDATED FROM ESTIMATED 2,974 BARRELS TO REPORTED FINAL OF 3,362 BARRELS. APPARENT CAUSE UPDATED TO ""OVERSTRESS FRACTURE OF A GIRTH WELD FROM EXTERNAL LOADS CAUSED BY SLOPE INSTABILITY THAT HAD NOT BEEN COMPLETELY MITIGATED"" AS DETERMINED BY NTSB. ADDITIONAL DOCUMENTS ARE PUBLICLY AVAILABLE ON NTSB WEBSITE.