"FLINT HILLS RESOURCES, LC"

Incident Narrative

"11/21/2025 UPDATES- PART C: QUESTION 6, PART D: QUESTION 8, PART E: QUESTIONS 9 & 10, PART G: G5 & PART H. UPDATED NARRATIVE: A RESTART PLAN WAS DEVELOPED BY FLINT HILLS RESOURCES AND APPROVED BY PHMSA PRIOR TO RECOMMISSIONING THE 6-INCH PROPANE PIPELINE. THIS RESTART PLAN INVOLVED BOTH AN OPERATIONS EXECUTION PLAN AND INTEGRITY MANAGEMENT PLAN. FLINT HILLS RESOURCES ENGAGED A THIRD-PARTY TO CONDUCT AN IMMEDIATE CAUSE INVESTIGATION. THE ANALYSIS INDICATED THE FAILED ANOMALY WAS ASSOCIATED WITH A CRACK AT THE EDGE OF MID-WALL LAMINATION PARALLEL TO THE PIPE WALL THAT ULTIMATELY FAILED BY FATIGUE. ____________________________________________________________________________ ON MARCH 19, 2025, LOCAL RESPONDERS WERE DISPATCHED TO A LOCATION ON NORTH HIGHWAY 52 IN ROSEMOUNT, MN FOLLOWING A PUBLIC REPORT OF A BRUSH FIRE. UPON ARRIVAL, RESPONDERS DID NOT FIND A BRUSH FIRE BUT IDENTIFIED A VAPOR CLOUD. NOTICING A PIPELINE MARKER, RESPONDERS SUSPECTED A RELEASE FROM FHR'S PIPELINE. AT APPROXIMATELY 15:11 A CALL WAS MADE TO FHR, INFORMING THEM OF THE VAPOR CLOUD SIGHTING ALONG NORTH HIGHWAY 52. RESPONDERS SUBSEQUENTLY INITIATED A SHUTDOWN OF HIGHWAY 52. FHR PERSONNEL NOTIFIED FHR'S PIPELINE CONTROL CENTER (PCC) AND DISPATCHED TO THE SITE, ARRIVING AT 15:20. THEY CONFIRMED A RELEASE FROM THE 6-INCH PROPANE PIPELINE. AN INTERNAL INCIDENT MANAGEMENT TEAM WAS ACTIVATED UPON CONFIRMATION. A SCHEDULED SHUTDOWN HAD BEEN INITIATED AT 15:05, PRIOR TO THE VAPOR CLOUD REPORT. AFTER THE REPORT, FHR ISOLATED THE GATE 11 PUMP STATION AT APPROXIMATELY 15:20, AND PRODUCT WAS BLED INTO JUNCTION CITY UNTIL THE DELIVERY VALVE WAS CLOSED AT 16:51. AFTER CLOSING THE DELIVERY VALVE AT JUNCTION CITY, FIELD PERSONNEL MANUALLY CLOSED THE DOWNSTREAM VALVE AT MP15. HIGHWAY 52 REOPENED AT 23:22 0N MARCH 19, 2025. TWO HOMES NEAR THE RELEASE LOCATION WERE EVACUATED ON MARCH 19, 2025. AIR MONITORING WAS CONDUCTED BY THE FIRE DEPARTMENT, AND THE HOMES WERE CLEARED FOR RE-ENTRY THE MORNING OF THURSDAY, MARCH 20, 2025. THERE WERE APPROXIMATELY 561 BARRELS OF PRODUCT RELEASED FROM FHR'S 6-INCH PROPANE PIPELINE. THE RELEASE ESTIMATE IS BASED ON A CALCULATED IMBALANCE IN THE LEAK DETECTION MODEL, DETERMINED TO HAVE BEGUN ON FEBRUARY 27, 2025. THE 6-INCH PROPANE PIPELINE REMAINS SHUT DOWN. FHR WILL DEVELOP A RESTART PLAN THAT WILL BE REVIEWED AND APPROVED BY THE PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION (PHMSA ) PRIOR TO RECOMMISSIONING THE 6-INCH PROPANE PIPELINE. A THIRD PARTY IS CONDUCTING METALLURGICAL EVALUATION ON THE FAILURE AND THE IMMEDIATE CAUSE IS UNDER INVESTIGATION."