40 CFR § 27.17 - Rights of parties.
Except as otherwise limited by this part, all parties may -
(a) Be accompanied, represented, and advised by a representative;
(b) Participate in any conference held by the presiding officer;
(c) Conduct discovery;
(d) Agree to stipulations of fact or law, which shall be made part of the record;
(e) Present evidence relevant to the issues at the hearing;
(f) Present and cross-examine witnesses;
(g) Present oral arguments at the hearing as permitted by the presiding officer; and
(h) Submit written briefs and proposed findings of fact and conclusions of law after the hearing.