The Olentangy Local School Board last night approved three-year contracts with unions representing its maintenance staff and bus drivers. The contracts include 1 percent pay raises for the upcoming school year and half-percent hikes each of the following two years. The deals also include changes to health care coverage that gives employees a choice between two plans. The unions previously ratified the deals. The board also approved 2 percent pay hikes for school administrators over each of the next three years.