Physical Plant to winterize irrigation system St. Thomas Newsroom October 29, 2009 The Physical Plant Grounds Department will begin winterizing the university’s irrigation system on the St. Paul campus today, Thursday, Oct. 29. The process may take up to two days to complete. Those walking across campus are asked to be aware that there may be occasions when water will be blowing out of the sprinklers. Questions or concerns? Call Bob Reed, Grounds Department , (651) 962-6545.