I don’t know when the CSB became the drilling investigator but here is their press release announcing the investigation…


CSB Will Investigate Fatal Well Explosion in Oklahoma

Washington D.C. January 25, 2018 – The U.S. Chemical Safety Board announced today that it will be moving forward with a full investigation into the fatal gas well explosion near Quinton, Oklahoma. The explosion fatally injured five workers.

Upon notification of the incident, the CSB deployed two investigators to gather additional facts  to assist the Board in making  a decision regarding the scope of the investigation. Investigators arrived on site Wednesday morning and met with the lease holder for the well and the drilling operator.  CSB investigators will continue to meet with well service providers and the well site consultant company that had employees on site at the time of the incident. Evidence preservation and collection is the initial focus of the investigation.

The CSB is an independent, non-regulatory federal agency whose mission is to drive chemical safety change through independent investigations to protect people and the environment. The agency’s board members are appointed by the President and confirmed by the Senate.

CSB investigations examine all aspects of chemical incidents, including physical causes such as equipment failure as well as inadequacies in regulations, industry standards, and safety management systems. For more information, contact public@csb.gov.