Officials at the University of Iowa are working to make sure the campus is both clean and safe for the arrival of students in a few weeks. Workers are stripping material that might contain harmful bacteria out of several buildings.

Dan Heater, U-I Director of Facilities Management, says they want to make sure air quality standards are up to code. "We’re not going to let anyone back in unless the building is 100 percent clean and that it meets all of the high standards," Heater said.

The cleaning process involves replacing and sanitizing air-handling units. The University hopes classrooms in several buildings will be cleaned-up and back up to code by August 15th. University officials say the June floods affected 20 major facilities and caused an estimated 231-million dollars in damage on the Iowa City campus.