PLAINS PIPELINE, L.P.

Incident Narrative

APPROXIMATELY 37 GALLONS OF CRUDE OIL WERE RELEASED FROM TAFT STATION PIPING. THE DATE AND TIME OF THE RELEASE (PART A Q4) IS INDICATIVE OF THE EARLIEST POSSIBLE TIME THE RELEASE COULD HAVE STARTED, AS IT WAS THE LAST TIME THE OPERATOR HAD WALKED THE STATION DURING HEAVY RAINS AND CONFIRMED THAT THERE WAS NO RELEASE OF CRUDE OIL. A SUPPLEMENTAL REPORT WILL BE SUBMITTED PENDING INVESTIGATION INTO THE CAUSE OF THE RELEASE. SUPPLEMENTAL NARRATIVE: DURING A HEAVY RAIN EVENT, A PAA OPERATOR WAS PERFORMING MULTIPLE STATION WALK-AROUNDS TO MONITOR BERM DRAIN VALVES AND GENERAL ASSET INTEGRITY. DURING THE WALK-AROUND AT APPROXIMATELY 12:40 ON 05/16/2021 (PART A Q4), THERE HAD BEEN NO INDICATION OF A RELEASE. DURING THE FOLLOWING STATION WALK-AROUND AT APPROXIMATELY 12:58 ON 05/16/2021 (PART A Q18A-B), THE OPERATOR IDENTIFIED AND BEGAN ADDRESSING THE RELEASE. THE CAUSE OF THE INCIDENT WAS DETERMINED TO BE INTERNAL CORROSION OF THE STATION PIPING SURGE RELIEF LINE AS A RESULT OF MICROBIOLOGICALLY INDUCED CORROSION. POST INCIDENT, NON-DESTRUCTIVE TESTING (NDT), USING A COMBINATION OF EMAT AND PAUT, WAS PERFORMED ON THE LOW SPOTS OFF THE RELIEF LINE. THE RELEASE LOCATION, AS WELL AS ONE ADDITIONAL LOCATION IDENTIFIED DURING THE NDT, WERE BOTH CUTOUT AND REPLACED WITH NEW PIPE. AS AN ADDITIONAL PREVENTATIVE MEASURE, THIS RELIEF LINE IS NOW UNDERGOING A FLUSHING PROGRAM TO REDUCE THE LIKELIHOOD OF FUTURE INTERNAL CORROSION. IT WILL ALSO BE RE-INSPECTED USING NON-DESTRUCTIVE TESTING BY THE END OF 2022.