Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation. Looking to resign with a One Month Notice Resignation Letter?Use our resignation letter template for notice-period roles. Within one work day, provide a copy of the constructive resignation letter to the employee's union, as authorized. 23.3 Effective Resignation. State that you are resigning and when your last day will be. Professional resignation letter examples for different reasons. Free templates and writing guide to resign on a positive note without feeling awkward. The termination process for BTS employees is the same for other project employees pursuant to Administrative Bulletin 416.3. Within one work day, provide a copy of the constructive resignation letter to the employee's union, as authorized.