The Secretary or the Secretary's designee shall send written notice of the hearing, not later than 20 days before the beginning of the hearing, to the party requesting the hearing and any other interested party who is entitled to participate or has been given leave to participate under Regulation .05 of this chapter. The notice of hearing shall specify the: Date, time, and place of the hearing; Legal authority and jurisdiction under which the hearing is to be held, including citation to any statute or regulation that is pertinent; Nature and subject matter of the hearing; Asserted grounds for appeal to be raised at the hearing; Name, mailing address, and telephone number of the presiding officer and of each party to whom the notice is sent; and Name, title, address, and telephone number of any attorney who has been designated to appear for the Secretary at the hearing. The notice shall be accompanied by a copy of any prehearing order rendered before the date of the notice.