Overtime is defined as time actually worked in excess of forty (40) hours a week for non-exempt employees. The employee’s supervisor may require an employee to work beyond the regularly scheduled daily work shift if necessary. The supervisor will assign overtime work by rotation based on departmental seniority of those employees who normally perform the work involved. When no employee volunteers to work overtime, assignment of the overtime shall be made to the least senior employee(s) possessing the skills, knowledge, and ability necessary to perform the job.