6 C.F.R. § 13.30

(a) The Presiding Officer will conduct a hearing on the record in order to determine whether the Defendant is liable for a civil penalty or assessment under § 13.3 and, if so, the appropriate amount of any such civil penalty or assessment considering any aggravating or mitigating factors.

(b) The Authority will prove Defendant's liability and any aggravating factors by a preponderance of the evidence.

(c) The Defendant will prove any affirmative defenses and any mitigating factors by a preponderance of the evidence.

(d) The hearing will be open to the public unless otherwise ordered by the Presiding Officer for good cause shown.