(a) The Presiding Officer will, as soon as practicable after the conclusion of the hearing, evaluate the entire administrative record and, on the basis of the administrative record, prepare and file a recommended decision with the Regional Administrator. The recommended decision must address all material issues of fact or law properly raised by respondent, and must recommend that the order be modified, withdrawn or issued without modification. The recommended decision must provide an explanation, with citation to material contained in the record for any decision to modify a term of the order, to issue the order without change or to withdraw the order. The recommended decision shall be based on the administrative record. If the Presiding Officer finds that any contested relief provision in the order is not supported by a preponderance of the evidence in the record, the Presiding Officer shall recommend that the order be modified and issued on terms that are supported by the record, or withdrawn.

(b) At any time within twenty-one (21) days of service of the recommended decision on the parties, the parties may file comments on the recommended decision with the Clerk. The Clerk shall promptly transmit any such comments received to the Regional Administrator for his consideration in reaching a final decision.