Union contracts for workers at hospitals across the city and nearby suburbs are set to expire on June 30, but as the deadline grows closer, there are a couple of rays of hope. A tentative agreement was reached Wednesday night with Temple University Health Systems, said Henry Nicholas, the president of District 1199C of the National Union of Hospital and Health Care Employees."Two down, two big hospitals to go," Nicholas said, noting that another tentative agreement had been reached Tuesday at Children's Hospital of Philadelphia.