PHILADELPHIA - With the shool year in full swing, service workers have avoided a strike with the School District of Philadelphia after ratifying a new four-year contract on Saturday.Workers represented by the Service Employees International Union Local 32BJ announced a tentative agreement on August 26 after voting to authorize a strike days prior if the district did not meet their demands.The agreement "achieves historic wage increases and essential training for the union’s membership," according to a statement by the union.Two thousand of Philadelphia's bus drivers, bus attendants, bus mechanics, general cleaners, building engineers, and trades workers voted to ratify the new contract, which will replace the current two-year contract that expired in August.In a statement, the union says the new four-year contract includes:.