GULF SOUTH PIPELINE COMPANY, LLC

Incident Narrative

ON 1/23/21, A GULF SOUTH TECHNICIAN, WHO WAS PERFORMING ROUTINE INSPECTIONS USING A LASER LEAK DETECTION DEVICE, FOUND A GAS LEAK INDICATION. FIELD OPERATIONS PERSONNEL MONITORED THE SITE UNTIL THE POTENTIAL LEAK COULD BE VERIFIED. ON 1/25/21 THE PRESSURE WAS LOWERED FROM 254 PSIG TO 200 PSIG IN PREPARATION FOR EXCAVATION DUE TO THE LINE BEING CONSTRUCTED WITH MECHANICAL COUPLINGS. ON 1/28/21, THE LINE WAS EXPOSED AND A MINOR LEAK THROUGH A DRESSER COUPLE WAS CONFIRMED. THE PIPELINE BELL HOLE WAS BACKFILLED AND PROPER NOTIFICATIONS WERE MADE INCLUDING AN NRC NOTIFICATION DUE TO THE ANTICIPATED REPAIR COST EXCEEDING $50,000. THE LEAK REPAIR WILL REQUIRE THE PIPELINE TO BE SHUT DOWN. ON 1/28/21, GULF SOUTH CONTACTED CENTERPOINT ENERGY TO COORDINATE ALTERNATIVE GAS SUPPLY FOR THEIR CUSTOMERS DURING THE OUTAGE. THE REPAIR IS CURRENTLY SCHEDULED FOR 2/24/21 BUT THAT IS CONTINGENT ON WEATHER/TEMPERATURES. A SUPPLEMENTAL/FINAL REPORT WILL BE SUBMITTED ONCE REPAIRS ARE COMPLETE. 4/2/21 UPDATE A4 TO BE WHEN LEAK WAS DISCOVERED RATHER THAN WHEN IT MET REPORTING CRITERIA AS REQUESTED BY PHMSA; UPDATE GAS LOSS TO INCLUDE INTENTIONAL GAS LOSS; AND UPDATE COST.