MARATHON PIPE LINE LLC

Incident Narrative

ON MARCH 20, 2018, MPL EXPERIENCED A RELEASE THAT WAS INITIALLY IDENTIFIED BY OUR LEAK DETECTION SYSTEMS (SCADA/CPM). THE LINE WAS IMMEDIATELY SHUT DOWN AND EMERGENCY RESPONSE RESOURCES BEGAN RESPONDING TO THE RELEASE. WHEN FIELD PERSONNEL ARRIVED ON-SITE, THEY DISCOVERED DIESEL IN THE BIG CREEK. ONCE THE LINE WAS TAPPED, MPL WAS ABLE TO CONFIRM THE RELEASE LOCATION, NEAR SOLITUDE, INDIANA. APPROXIMATELY, 1,400 BARRELS WERE RELEASED TO THE CREEK AFTER A GIRTH WELD FAILED (COMPLETELY SEPARATED). INVESTIGATION FINDINGS INDICATE THAT THE GIRTH WELD FAILED DUE TO A LAND-SLIP. IN ORDER TO REPAIR THE RELEASE, MPL REPLACED THE RIVER CROSSING WITH A HORIZONTALLY DIRECTIONAL DRILL (HDD) UNDER BIG CREEK. APPROXIMATELY 1,205 BARRELS HAVE BEEN RECOVERED. THE LINE HAS BEEN RETURNED TO NORMAL OPERATIONS. NOTE: REGARDING DEPTH-OF-COVER (DOC) IN PART B, QUESTION 11 - ALTHOUGH THE EXACT DOC IS UNKNOWN DUE TO THE LEAKAGE INVESTIGATION EXCAVATION ACTIVITIES AND TOPOGRAPHY, EMERGENCY RESPONDERS ESTIMATED THAT THERE WAS A MINIMUM OF 36"" OF COVER AT THE SITE OF THE RELEASE, WHICH CONFIRMS OUR LATEST SURVEY RESULTS. THE INITIAL NRC REPORT #11207318 (AS NOTED IN PART A, QUESTION 6) WAS MADE ON MARCH 20, 2018, AT 20:03 CST. ADDITIONALLY, ON MARCH 20, 2018, REPORT #1207323, WAS MADE AT 22:45 TO PROVIDE AN UPDATED VOLUME ESTIMATE. 5/10/18 UPDATE: PART C, QUESTION 6 - UPDATED THE TYPE OF ACCIDENT INVOLVED. PART D, QUESTION 8 - UPDATED COSTS WERE PROVIDED. 6/19/18 UPDATE: PART D, QUESTION 8 - UPDATED COSTS WERE PROVIDED. PART H - UPDATED NARRATIVE. 7/26/18 UPDATE: PART D, QUESTION 8 - UPDATED COSTS WERE PROVIDED. 10/17/18 UPDATE: PART D, QUESTION 8 - UPDATED WITH FINAL COSTS. PART H - UPDATED NARRATIVE.