All persons who are representing parties before the board shall conform to the standards of ethical conduct required of attorneys before the courts of Washington even if the representative is not an attorney. Representatives who, in the opinion of the presiding officer, violate those ethical standards may be reprimanded or sanctioned. Sanctions may include, among other measures, the imposition of costs and the exclusion of the representative from the proceedings. The board may, after notifying the representative and holding a hearing, take appropriate disciplinary action including, but not limited to, barring such person from representing another party in any future board proceedings.