A show–cause order issued under this subtitle shall: Specify the provision that allegedly has been violated; Describe the nature and extent of the alleged violation; Require the person charged to appear at a hearing and show cause why an order requiring corrective action should not be issued; and State the date, time, and place of the hearing. Each show–cause order issued under this subtitle shall be in writing and shall be served: Not less than 20 days before the time set for the hearing; and As a summons is served under the Maryland Rules or by certified mail.