Withdrawing from Signed Vacation Periods. If an employee needs to withdraw from the vacation period signed for on the leave schedule, a written request will be submitted to the immediate supervisor stating the reasons. Notification will be given to the xxxxxxx or his/her designee as soon as possible. Vacated period(s) shall be posted as soon as they become vacant. Periods vacated with at least 14 days advance notice will be posted for bid. Periods vacated without 14 days advance notice may be posted for bid depending on service needs.