40 CFR § 27.12 - Notice of hearing.
(a) When the presiding officer obtains the complaint and answer, the presiding officer shall promptly serve a notice of hearing upon the defendant in the manner prescribed by § 27.8. At the same time, the presiding officer shall send a copy of such notice to the representative for the Government.
(b) Such notice shall include -
(1) The date, time and place, and the nature of the hearing;
(2) The legal authority and jurisdiction under which the hearing is to be held;
(3) The matters of fact and law to be asserted;
(4) A description of the procedures for the conduct of the hearing;
(c) The presiding officer shall issue the notice of hearing at least twenty (20) days prior to the date set for the hearing.