36 CFR § 214.12 - Responsive statement and reply.
(a) Responsive statement. The Responsible Official shall prepare a responsive statement addressing the factual and legal allegations in the appeal. The responsive statement and any supporting documentation shall be filed with the Appeal Deciding Officer within 20 days of receipt of the appeal or the unsuccessful conclusion of mediation conducted pursuant to 36 CFR part 222, subpart B, whichever is later.
(b) Reply. Within 10 days of receipt of the responsive statement, the appellant and intervenors, if any, may file a reply with the Appeal Deciding Officer addressing the contentions in the responsive statement.