Documents submitted for the record after the close of the hearing will not be received in evidence except upon ruling of the administrative law judge. Such documents when submitted shall be accompanied by proof that copies have been served upon all parties, who shall have an opportunity to comment thereon. Copies shall be received not later than twenty (20) days after the close of the hearing except for good cause shown, and not less than ten (10) days prior to the date set for filing briefs. Exhibit numbers should be assigned by counsel or the party.