(1) All new material sought to be introduced at the board proceeding must be filed and served on all other parties no later than five business days prior to the scheduled board proceeding or the material will not be considered by the board.

(2) The board will not consider any new material introduced for the board review if it is documentary evidence unless good cause is shown why the new documentary evidence was unavailable at the hearing before the hearing officer. New material introduced for the board review that is argument and not documentary evidence will be admitted.

(3) The rules of evidence and civil procedure are not binding in board administrative proceedings for unemployment insurance matters. If new documentary evidence is admitted by the board, it must be the type of evidence on which responsible persons are accustomed to rely in the conduct of serious affairs.

(4) If the board finds that additional evidence is required to reach a decision, it may remand the matter to the appeals referee to conduct a hearing to obtain additional evidence in the matter. The board shall promptly notify the interested parties of such action. The appeals referee must make a new decision based on the additional evidence and the existing record.