There was a chemical spill at the former Federal Mogul plant north of Waldo Boulevard in Manitowoc late last week.
The spill occurred late Thursday night and persisted through about 7:00 Friday evening.
The Manitowoc Fire Department reports workers were moving some hydrochloric acid when some of the chemicals were spilled and got into a large quantity of paper.
A Haz-Mat team from Appleton was called in and a third-party firm assisted in cleanup, but some of the paper remained contaminated.
A wind shift and an increase in humidity Friday reactivated the plume of chemicals and an open door caused the plume to re-enter the building.
Personnel were evacuated for the second time, but crews were able to complete the cleanup. There were no injuries reported.
