40 CFR 179.98 - Briefs and arguments.
(a) Promptly after the taking of evidence is completed, the presiding officer will announce a schedule for the filing of briefs. Briefs must include a statement of position on each issue, with specific and complete citations to the evidence and points of law relied on. Briefs must contain proposed findings of fact and conclusions of law.
(b) The presiding officer may, as a matter of discretion, permit oral argument after the briefs are filed.