310 CMR, § 42.18
Any person who has been denied certification or whose certification has been revoked may make a written request for an adjudicatory hearing before the Department pursuant to M.G.L. c. 30A and 310 CMR 1.01: Adjudicatory Proceeding Rules for the Department of Environmental Protection. The request for a hearing must be sent by certified mail or hand-delivered, and received by the Department within 21 calendar days of the date of receipt of the decision being appealed. The request for hearing shall state specifically, clearly, and concisely the facts which are the grounds for the appeal, the relief sought, and any additional information required by 310 CMR 1.01(6)(b) or other applicable law or regulation. In every proceeding the burden shall be on the applicant for, or the holder of, a certification to demonstrate compliance with 310 CMR 42.00.
310 CMR, § 42.18