A chemical leak at the Sports Barn fitness center on Hamil Road caused the building to be evacuated early Friday morning.
The Chattanooga Fire Department responded to the reported haz-mat incident at 6:37 a.m.
Officials say an employee was working with some pool chemicals when the liquid leaked out of a container and the employee breathed in some of the vapors, becoming ill.
The manager learned of the incident and called 911.
The leak was very small and the cleanup was completed quickly, according to officials.