In June 2008, five feet of water flowed over the emergency spillway of the Iowa River. A few miles downstream, 22 buildings at the University of Iowa (UI) were inundated with floodwater. After buildings were cleaned by the cleanup contractors, Terracon's field staff collected air and surface samples to assess whether the cleanup contractors had mitigated the bacterial and fungal hazards left behind by the floodwaters. Utilizing a team of more than 60 staff from 15 different offices across the country, Terracon was able to cover multiple building sites simultaneously. Terracon then observed the cleanup contractors as they cleaned and re-stored the heating, ventilating, and air-conditioning (HVAC) systems in the remaining flood-affected buildings. To ensure a building was ready for permanent occupancy, Terracon collected random air samples and surface tape-lift samples throughout a building after the HVAC systems had run for at least 48 hours. As a final step, Terracon conducted formaldehyde testing of the ambient air in some of the new trailers that were used as temporary classrooms and offices to address concerns of formaldehyde out-gassing from the building materials.