The time for filing briefs to the presiding officer, and extensions thereof, shall be fixed by him. The period of time allowed shall be the same for all parties unless the presiding officer, for good cause shown, directs otherwise. Normally there shall be an opening brief by the moving parties, an answering brief by the proponents of a contrary conclusion and a short reply by the moving parties. Briefs and statements of position as authorized, shall be served upon all parties pursuant to subpart D of this part. Briefs shall include a summary of evidence, together with references to exhibit numbers and pages of the transcript, and memoranda of law with appropriate citations of the authorities relied upon. They shall contain proposed findings of fact and conclusions in serially numbered paragraphs.