34 C.F.R. § 33.37
(b) The findings of fact must include a finding on each of the following issues:
(d) Unless the initial decision of the ALJ is timely appealed to the Department head, or a motion for reconsideration of the initial decision is timely filed, the initial decision shall constitute the final decision of the Department head and shall be final and binding on the parties 30 days after it is issued by the ALJ.
(Authority: 31 U.S.C. 3803(h)(i))