An overturned 18-wheeler has shut down a Geismar road as hazardous materials crews respond to the scene.

Jefferson Highway, also known as La. 73, is blocked between La. 30 and River Road, after a big rig incident about 11 a.m., said Louisiana State Police spokesman Trooper Bryan Lee.

The 18-wheeler tanker contained sulfuric acid and a small amount of it is leaking from a safety valve on the tanker, a parish homeland security official said.

Rick Webre, director of Ascension Parish homeland security, that the valve is actually performing as it should be and the acid poses no threat to traffic or the surrounding area. He said no evacuation has been ordered for the area or the traffic site.

He said a contractor is being called in to remove the sulfuric acid from the tanker.

“It may be a little while,” he said.