(a) Proposed findings and conclusions and supporting briefs. (1) Using the same method of service for each party, the presiding officer shall serve notice upon each party that the certified transcript, together with all hearing exhibits and exhibits introduced but not admitted into evidence at the hearing, has been filed with the presiding officer. Any party may file with the presiding officer proposed findings of fact, proposed conclusions of law, and a proposed order within 30 days after the parties have received notice that the transcript has been filed with the presiding officer, unless otherwise ordered by the presiding officer.

(2) Proposed findings and conclusions must be supported by citation to any relevant authorities and by page and line references to any relevant portions of the record. A post-hearing brief may be filed in support of proposed findings and conclusions, either as part of the same document or in a separate document.

(3) A party is deemed to have waived any issue not raised in proposed findings or conclusions timely filed by that party.

(b) Reply briefs. Reply briefs may be filed within 15 days after the date on which the parties' proposed findings and conclusions and proposed order are due. Reply briefs shall be limited strictly to responding to new matters, issues, or arguments raised by another party in papers filed in the proceeding. A party who has not filed proposed findings of fact and conclusions of law or a post-hearing brief may not file a reply brief.

(c) Simultaneous filing required. The presiding officer shall not order the filing by any party of any brief or reply brief supporting proposed findings and conclusions in advance of the other party's filing of its brief.