SUNOCO PARTNERS MARKETING & TERMINALS LP

Incident Narrative

ON 6/21/21 AT APPROXIMATELY 7:30PM, OPERATIONS MANAGEMENT RECEIVED NOTIFICATION FROM PERSONNEL PERFORMING ROUTINE FACILITY PATROLS ADVISING THAT OIL HAD BEEN DISCOVERED ON THE GROUND IN THE TANK 1542 IMPOUNDMENT DIKE. A TANK-TO-TANK TRANSFER WAS INITIATED TO EMPTY TANK 1542. AS THIS PROCESS WAS TAKING PLACE OIL WAS OBSERVED COMING FROM IN BETWEEN THE TANK SHELL AND THE CONCRETE BASE. APPROXIMATELY 114 BARRELS OF CRUDE WERE RELEASED INTO THE TANK DIKE IMPOUNDMENT AREA. THE CLEANUP CREW WAS DISPATCHED AND ALL FREE PRODUCT WAS PICKED UP AND ALL CONTAMINATED SOIL WAS REMOVED. TANK 1542 WAS LATER DEGASSED AND CLEANED IN PREPARATION FOR AN INTERNAL API 653 INSPECTION. DURING THE INSPECTION, CREWS PERFORMED A SCAN OF THE BOTTOM TO ASSESS FOR REPAIRS AND DETERMINE THE CAUSE OF THE FAILURE. DURING THE 653 INTERNAL INSPECTION A SCAN OF THE FLOOR PLATES DETERMINED THAT THERE WAS A AN INTERNAL CORROSION THROUGH WALL FAILURE ON A FLOOR PLATE DUE TO THE FAILURE OF THE INTERNAL LINER WHICH ALLOWED THE BOTTOM TO CORRODE OVER TIME. AS A PART OF THE OVERALL REPAIR PLAN WELDED BOTTOM PATCH PLATES AND A NEW INTERNAL LINER WERE INSTALLED TO REPAIR THE FAILED SECTION OF THE TANK BOTTOM. DUE TO THE EXTENT OF PREPARATION REQUIRED TO AFFECT THE BOTTOM PLATE, TOTAL COSTS DIRECTLY ATTRIBUTABLE TO THE FAILURE EXCEEDED $50K. IT WAS UNKNOWN AT THE TIME OF FAILURE DISCOVERY WHAT THE EXTENT OF REPAIRS WOULD BE AND THE COSTS ASSOCIATED WITH SUCH. AN ESTIMATE OF THE COSTS DIRECTLY ATTRIBUTABLE TO THE FAILURE REPAIR ARE INCLUDED IN PART D-8 OF THIS REPORT. WHEN IT WAS DETERMINED THAT TOTAL COSTS WOULD EXCEED $50K THE NRC WAS NOT NOTIFIED DUE TO THE TIMEFRAME HAVING WELL EXCEEDED THE EMERGENCY RESPONSE PHASE OF THE EVENT. FURTHER, ALL IMPACTS WERE TOTALLY CONTAINED ON COMPANY PROPERTY WITHIN THE TANK IMPOUNDMENT DIKE. THERE WAS AT NO TIME ANY SIGNIFICANT RISK TO PERSONS OR PROPERTY DUE TO THIS FAILURE. WHEN THE SUPPLEMENTAL AND FINAL REPORT WERE FILED, PHMSA AID AND SW REGION WERE MADE AWARE OF THE CIRCUMSTANCES REGARDING THE TOTAL FAILURE COSTS.