The presiding official shall file an addendum decision with the Commission within 20 calendar days after receipt of a request and any responses. The presiding official shall scrutinize with due care the hours and billing rates claimed. The addendum decision shall include findings of fact and conclusions of law written in clear and concise language. The Executive Director shall issue the addendum decision to the parties within 5 calendar days after the addendum decision is filed with the Commission. The addendum decision shall be final and conclusive except as provided for in the Administrative Procedures Act and OAC 455:10-3-20.
Okla. Admin. Code § 455:10-15-5