While working on damaged pipes with chemical residue, alarms were set off at the Wacker plant at Charleston, Tn., on Tuesday morning.
Bradley County School officials said, "Their employees are sheltering in place as a precaution. There is no threat to our schools or the community.
"Bradley County Safety Director and the Director of EMA have been in contact with representatives from Wacker."
"This morning we detected a slight elevation of residual chemicals stemming from the Sept. 7 incident at the WACKER site in Charleston, Tn.," said Wacker Emergency Preparedness Manager Dan King.
"According to emergency protocol and precautionary measures, WACKER issued an onsite shelter in place, which has been lifted. There was no risk to the community or employees.
"Safety is our top priority along with the care and well-being of our employees and our community. Our commitment to safety remains our primary focus."
Wacker last week had a chemical discharge that brought an evacuation near the plant and caused the Bradley County Schools to have to close for a day.
There was another incident at the plant the prior week.