It's hammer time. Starting this month, construction for the new Suzanne Lemberg Usdan University Center begins. Alan Rubacha, project manager, is setting up an 8-foot chain-link fence that will surround the old Alumni Athletic Building and Fayerweather Gymnasium. The driveway and cement walkway that currently provide access from Wyllys Avenue to the lot behind South and North College will be closed to vehicles and pedestrians as of Monday, June 13. The lot itself will be closed except for handicap access and service. Parking has been reassigned to the lot adjacent to the Office of Admission and to the lot behind…