At approximately 8:13 a.m. Thursday, Sept. 18, Round Rock firefighters responded to a hazardous materials leak at Exfluor Research Corp., 2350 Double Creek Drive. The leak was eventually contained. No one was injured by the leak.

Arriving at the business, firefighters reported seeing fumes coming from the side of the building. Employees at the business were working to contain the release of the material, perfluorosuccinoyl fluoride. A valve on top of a cylinder was leaking the material. It is unknown at present how much of the material leaked.

The material was offloaded to a different container. As of 4 p.m. Thursday, Sept. 18, a gaseous cloud remains in the building. Air quality monitoring shows the gas is confined to the building.

Employees were evacuated from Exfluor. Neighboring businesses and nearby Cedar Ridge High School were recommended to shelter in place, as a precaution, until air quality monitoring confirmed the gas was contained. That occurred around noon.

Employees at Christianson Air Conditioning and Plumbing, next door to Exfluor, made the initial call to 9-1-1 after some workers there complained of difficulty breathing.

The Round Rock Fire Department Hazardous Materials Team and the Williamson County Hazardous Materials Team both responded to the incident. Officials from the Texas Commission on Environmental Quality also responded. Air around the building will be monitored periodically while remediation takes place, which is expected to occur this afternoon and evening. Remediation is the company’s responsibility.

Double Creek Drive was initially closed from the SH 45 frontage road to Gattis School Road. After the release was contained to the building, it was closed from Bryant Drive to the SH 45 frontage road. Double Creek Drive is now completely open.