TEXAS GAS SERVICE COMPANY, A DIVISION OF ONE GAS, INC.

Incident Narrative

ON 10/27/18 AT 13:25, TEXAS GAS SERVICE WAS NOTIFIED BY THE AUSTIN FIRE DEPARTMENT THAT THERE WAS AN EXPLOSION OF THE HOME AT 2301 BENDRIDGE TRAIL IN AUSTIN, TEXAS. ON 10/28/2018, IT WAS DETERMINED THAT A JURISDICTIONAL PIPELINE FAILURE WAS INVOLVED IN THE INCIDENT. INVESTIGATION IDENTIFIED DEFORMATION OF THE SERVICE LINE, WHICH APPEARS TO HAVE RESULTED FROM UNREPORTED THIRD-PARTY EXCAVATION DAMAGE. A LABORATORY EXAMINATION HAS BEEN CONDUCTED AT THE FAILURE LOCATIONS ON THE SERVICE TEE AT THE GAS MAIN AS WELL AS THE LOCATION WHERE THE SERVICE LINE WAS DEFORMED. THESE EXAMINATIONS WERE CONDUCTED BY A THIRD-PARTY EXPERT AND WERE OBSERVED BY TEXAS RAILROAD COMMISSION STAFF AND AUSTIN FIRE DEPARTMENT INVESTIGATOR. FURTHER TESTS AND EXAMINATIONS ARE UNDER WAY. THIS REPORT WILL BE SUPPLEMENTED WHEN THE INVESTIGATION IS COMPLETE. SUPPLEMENTAL INFORMATION BELOW ON THE THIRD-PARTY REPORT. THIRD-PARTY EXPERT BAKER RISK REPORTS THAT AN INSPECTION OF THE 6606/6608 STONLEIGH SERVICE LINE OCCURRED ON JUNE 24, 2019 AT BAKER RISK. THE INSPECTION CONFIRMS PRIOR OBSERVATIONS THAT THE DAMAGE TO THE SERVICE LINE WAS CAUSED BY EXTERNAL FORCES THAT DAMAGED THE WRAP AND BENT THE PIPE. THE FIELD WRAP ON THE TEE IN THE MIDDLE OF THE SERVICE LINE WAS COMPARABLE TO THE FIELD WRAP ON THE TEE AT THE MAIN. BOTH OF THESE WRAPS WERE INTACT WHEN THE EVIDENCE WAS RECOVERED. OBSERVATIONS OF THE TEES FOLLOWING REMOVAL OF THE WRAPS DURING EVIDENCE INSPECTIONS SHOWED THAT THE TEES WERE WELL PROTECTED BY THE WRAPS AND DID NOT EXHIBIT CORROSION. THE SERVICE LINE BEING DISPLACED TO THE WEST CAUSED CRACKS IN TWO LOCATIONS ON THE TEE AT THE GAS MAIN. THE TWO CRACKS ON THE TEE AT THE MAIN WERE STRESS-INDUCED FAILURES AND NOT CAUSED BY CORROSION OR WELD QUALITY OR CONDITION.