GULF SOUTH PIPELINE COMPANY, LLC

Incident Narrative

ON 2/12/2023 AT APPROXIMATELY 03:56, GULF SOUTH PIPELINE COMPANY'S GAS CONTROL RECEIVED A SCADA ALARM INDICATING A PRESSURE DROP AT THE JACKSON CITY GATE #5 ON ITS INDEX 381. GAS CONTROL DISPATCHED LOCAL OPERATIONS PERSONNEL TO INVESTIGATE. TWO INTERCONNECT VALVES WERE CLOSED AND THE SECTION WAS ISOLATED AT APPROXIMATELY 05:40. OPERATIONS PERSONNEL THEN BEGAN TO WALK THE LINE TO INSPECT FOR LEAKS AND IDENTIFIED THE RUPTURE SITE AT APPROXIMATELY 07:30. THE PHMSA ACCIDENT INVESTIGATION TEAM VISITED THE RUPTURE SITE AND GULF SOUTH IS WORKING WITH PHMSA TO DEVELOP AND IMPLEMENT A RESTART PLAN THAT IS ACCEPTABLE TO PHMSA. THE COST SHOWN FOR THIS INCIDENT INCLUDES THE REQUIREMENTS OF THE RESTART PLAN. IN RESPONSE TO QUESTIONS D10 AND D11, GULF SOUTH'S CUSTOMER, THE LOCAL DISTRIBUTION COMPANY (LDC), ESTIMATED 217 CUSTOMERS WHO WERE IMPACTED. THE LDC NOR GULF SOUTH HAS AN EXACT COUNT NOR KNOWLEDGE OF THE PORTION THAT WERE RESIDENTIAL CUSTOMERS VS. BUSINESSES. 8/30/2023: UPDATE TO DOCUMENT CAUSE OF FAILURE AND REPAIR COST. 9/18/2023: UPDATE CAUSE FROM ""G4 - OTHER"" TO ""G2 - NATURAL FORCE DAMAGE"" PER PHMSA'S INSTRUCTION. NOTE THAT A ROOT CAUSE ANALYSIS PERFORMED BY A THIRD-PARTY CONSULTANT DETERMINED THE PIPE RUPTURED AT A GIRTH WELD DUE TO TENSION IMPOSED BY A LANDSLIDE WHICH WAS THE RESULT OF A MAN-MADE POND THAT HAD BECOME UNSTABLE. THIS LANDSLIDE IS LOCATED ON THE SAME BERM SLOPE WHERE HISTORICAL LANDSLIDES AND LANDSLIDE REMEDIATION HAS OCCURRED BY THE PROPERTY OWNER (THE CURRENT OWNER IS US SILICA). THE LANDSLIDE IS LOCATED APPROXIMATELY 160-FEET FROM THE FAILURE LOCATION. 9/18/2023 UPDATE TO SHOW ADDITIONAL NRC FOLLOW-UP CALL NUMBER PER PHMSA. 3/7/2024 UPDATED TO CORRECT RESPONSES TO QUESTIONS E2A AND E2B.