PLAINVIEW, Minn. – The beleaguered Plainview School Board has agreed to mediation to help settle a contract impasse with its displeased teachers union The first meeting with an outside mediator will be December 19, it was announced. The teachers have many beefs and have begun withholding services as a bargaining chip. The union seeks competitive salaries with other school district and compensation for extra duty. These issues are amid allegations of Board high-handedness and secretiveness and also harassment of a teacher-coach.