MARATHON PIPE LINE LLC

Incident Narrative

ON APRIL 17 AT 12:12 CDT, THE MT. CARMEL FIRE DEPARTMENT NOTIFIED MARATHON PIPE LINE (MPL) OF AN APPARENT SHEEN ON THE WABASH RIVER. FIELD PERSONNEL WERE DISPATCHED TO CLOSE THE BLOCK VALVES UPSTREAM AND DOWNSTREAM OF THE WABASH RIVER. THE TOTAL VOLUME RELEASED IS ESTIMATED AT 854 BARRELS. RESPONDERS ATTEMPTED TO CONTAIN THE RELEASE BY DEPLOYING BOOMS; HOWEVER, THE BOOMING OPERATIONS WERE UNSUCCESSFUL DUE TO FLOOD CONDITIONS, HIGH RIVER VELOCITY, AND SAFETY CONCERNS. UNIFIED COMMAND DETERMINED BOOMING OPERATIONS SHOULD BE DISCONTINUED. MODELING WAS CONDUCTED UTILIZING THE NATIONAL OCEAN AND ATMOSPHERIC ADMINISTRATION (NOAA) ADIOS SOFTWARE, WHICH ESTIMATES APPROXIMATELY 521 BARRELS OF DIESEL EVAPORATED. SHORELINE CLEANUP AND ASSESSMENT TECHNIQUE (SCAT) WAS CONDUCTED IN COLLABORATION WITH STATE AGENCY REPRESENTATIVES TO SURVEY PETROLEUM IMPACTS ON THE AFFECTED SHORELINE. THE SHORELINE WAS LARGELY NOT IMPACTED, BUT ANY IMPACTED AREAS WERE CLEANED UP. PRELIMINARY INVESTIGATION INDICATES THERE WAS SCOURING IN THE RIVER DUE TO NATURAL FORCES WHICH CAUSED AN UNSUPPORTED SPAN. THE INITIAL NRC REPORT (1145495) WAS MADE AT 13:54 CDT; HOWEVER, AN ESTIMATED VOLUME WAS NOT AVAILABLE AT THAT TIME. A SECOND NRC REPORT (#1145511) WAS MADE AT 22:06 CDT TO PROVIDE AN ESTIMATED VOLUME THAT WAS RELEASED. 7/12/16 UPDATE: PART A, QUESTION 5: THE LATITUDE/LONGITUDE WERE CORRECTED. PART A, QUESTION 14: INITIALLY ANSWERED ""NO"" BUT WAS UPDATED TO ""YES"". NOTE: THE PIPELINE WAS SHUT DOWN BY SCHEDULE AT THE TIME THE RELEASE OCCURRED AND STAYED DOWN UNTIL REPAIRS WERE COMPLETE. PART D, QUESTION 8: ESTIMATED COSTS WERE UPDATED. 12/22/16 UPDATE: PART C, QUESTION 3.D: THE PIPE SPECIFICATION WAS UPDATED TO API 5L. PART E, QUESTION 7.B: SINCE THE CPM SYSTEM WAS FUNCTIONING AS DESIGNED AT THE TIME OF THE RELEASE, THIS ANSWER WAS UPDATED TO ""YES"". PART E, QUESTION 9 NOTE: AFTER INVESTIGATING THIS INCIDENT, IT HAS BEEN DETERMINED THAT CONTROL ROOM ACTIONS WERE NOT THE CAUSE AND DID NOT CONTRIBUTE TO THE CAUSE OF THIS ACCIDENT. HOWEVER, IMPROVEMENTS IN LEAK DETECTION WERE IDENTIFIED, SPECIFICALLY REGARDING ANALYSIS OF SLACK LINE ALARMS. PART D, QUESTION 8: FINAL COSTS WERE UPDATED.