Except when interested persons participating in the hearing have waived the tentative decision under § 1902.21(b) interested persons participating in the hearing shall have an opportunity to file exceptions to a tentative decision and objections to such exceptions within periods of time to be specified in the tentative decision. An original and four copies of any exception or objections shall be filed.

Thereafter the Assistant Secretary shall issue a final decision ruling upon each exception and objection filed. The final decision shall be published in the Federal Register.

Any final decision approving a plan shall contain the provisions prescribed in § 1902.20(b)(1)(iii) concerning Federal enforcement in areas covered by the plan.