COLUMBIA GAS TRANSMISSION, LLC

Incident Narrative

ON 7/9/2019 A CONTRACTOR WAS WORKING FOR THE LANDOWNER TO INSTALL A NEW CULVERT AT THE SAME LOCATION AS AN EXISTING CULVERT. DURING THE EXCAVATION THE CONTRACTOR CAME IN CONTACT WITH PIPELINE OPERATOR COLUMBIA GAS TRANSMISSION, LLC (OPID 2616), COLUMBIA, PIPELINE EM-122. PRESSURE ON EM-122 WAS REDUCED FROM 450 PSIG TO ABOUT 100 PSIG IN ORDER TO MAINTAIN MARKET REQUIREMENTS UNTIL COMPRESSED NATURAL GAS (CNG) TRUCKS COULD BE USED AS AN ALTERNATE SUPPLY WHILE REPAIRS WERE MADE. APPROXIMATELY 9 COMPRESSED TANKERS MAINTAINED THE VANCEBURG MARKET THROUGHOUT THE PIPELINE REPAIR. THE CONTRACTOR WAS USING AN EXCAVATOR (KOBELCO 135SR) TO INSTALL THE NEW CULVERT. THE LANDOWNER ACKNOWLEDGE THAT A CALL WAS NOT MADE TO KY811. COLUMBIA HAS VERIFIED THAT A LOCATE REQUEST FOR THIS LOCATION WAS NOT MADE FOR THE DATE OF THIS INCIDENT. ON 7/9/2019 COLUMBIA LOWERED THE PIPELINE PRESSURE TO 100 PSIG, AND PROVIDE ONSITE MONITORING A CONTROLLED LEAK 24/7 UNTIL MATERIALS AND EQUIPMENT WERE AVAILABLE TO MAKE REPAIRS. LINE EM-122 IS LOCATED IN A CLASS 1 LOCATION. THE CLOSEST HABITABLE RESIDENTS ARE APPROXIMATELY 500 FEET AWAY AND WERE MADE AWARE OF THE INCIDENT AND MAINTAINED COMMUNICATION DURING REPAIR OPERATIONS. ON 7/11/2019 CNG WAS PLACED INTO SERVICE TO VANCEBURG MARKET. LINE EM-122 WAS SHUT IN AND BLOWDOWN. NO MARKET CUSTOMERS WERE AFFECTED, BUT APPROXIMATELY 14 FARM TAPS WERE SHUT IN DURING PIPELINE REPAIRS. ON 7/13/2019, FINAL REPAIRS WERE MADE USING PRETESTED 6.625' OD, 0.188 WALL, MAOP OF 720 PSIG PIPE. CNG HAS DISCONNECTED FROM THE VANCEBURG MARKET. THE PIPELINE WAS PURGED AND PLACE INTO SERVICE ON 7/11/2019. COLUMBIA DID INVESTIGATE PUBLIC AWARENESS RECORDS AND DETERMINED THAT THE LANDOWNER HAS RECEIVED PAST INFORMATION FROM ITS MAILING PROGRAM THAT INCLUDED A REMINDER TO CALL BEFORE YOU DIG.