"COLUMBIA GAS TRANSMISSION, LLC"

Incident Narrative

"ON SEPTEMBER 12, 2025, AT 13:37 COLUMBIA GAS TRANSMISSION, LLC (COLUMBIA) MONITORING CENTER RECEIVED A CALL FROM THE MARYLAND EMERGENCY SERVICE REGARDING A POTENTIAL NATURAL GAS RELEASE FROM A COLUMBIA FACILITY NEAR TERRA ALTA, WV. COLUMBIA OPERATIONS PERSONNEL RESPONDED AND WERE ON SITE AT 15:25 AND CONFIRMED THAT THE UNINTENDED GAS RELEASE TO BE FROM LINE 8234. THE INVOLVED SECTION OF LINE 8234 IN THIS EVENT IS SUBMERGED WITHIN THE NORTH BRANCH OF THE POTOMAC RIVER ON THE MD-WV LINE, AND THE PIPELINE RESIDES BELOW THE BOTTOM OF THE RIVERBED. WATER LEVELS WERE LOW, AND CURRENT HAD SIGNIFICANTLY SLOWED DOWN, RESULTING IN KAYAKERS SEEING AN AREA OF WATER WITH INCREASED BUBBLING. GARRETT COUNTY 911 RECEIVED A CALL FROM KAYAKERS ABOUT THE LEAK, REPORTING AN ODOR OF GAS. PIPELINE TECHNICIAN ARRIVED ON SITE AT 15:25 AND FOUND A NON-HAZARDOUS LEAK. NEITHER THE TECHNICIAN NOR FIREFIGHTERS WHO WERE AT THE LOCATION SAW ANY DEAD FISH OR NOTABLE EFFECTS ON WILDLIFE. THE TECHNICIAN REPORTED NO SHEEN ON THE WATER. NATIONAL RESPONSE CENTER (NRC) WAS NOTIFIED OF THE LEAK AROUND 16:07 ON THE DAY OF DISCOVERY, AND THE 48-HOUR NRC REPORT NUMBER WAS COMPLETED ON SEPTEMBER 14. THE NRC 1-HR. REPORT AND 48-HR. REPORT NUMBERS WERE 1442591 AND 1442688, RESPECTIVELY. SITE MONITORING HAS BEEN INCREASED TO ONCE A WEEK TO ENSURE THE NON-HAZARDOUS LEAK CONDITIONS DO NOT WORSEN PRIOR TO BEING PERMANENTLY REPLACED. NOTE: ALL RECORDED TIMES ARE IN EASTERN DAYLIGHT TIME (EDT)."