Oshawa Campus Closure – Saturday, July 7 Posted on June 24, 2012 at 8:35 am. Durham College’s Oshawa campus will be closed on Saturday, July 7 from 7 a.m. to 6 p.m. for scheduled maintenance on the electrical substation. By performing this work we can be assured of a reliable power system throughout the year. For everyone’s safety, all buildings on the Oshawa campus are closed during the power outage as there is only minimal emergency power available. Durham College apologizes for any inconvenience this may cause. SHARE: