In a contested case all parties shall be afforded an opportunity for hearing after reasonable notice. The notice shall: State the time, place, and nature of the hearing; State the legal authority under which the hearing is to be held; Cite the particular sections of the statutes and regulations, including procedural regulations, that are pertinent; and State concisely and simply: The facts that are asserted; or If the facts cannot be stated in detail when the notice is given, the issues that are involved.