The department shall hold confidential any information concerning the chemical composition, quantity, method of treatment or disposal of hazardous waste or any information related thereto when shown by any person that such information, if made public, would divulge competitive business information, methods or processes entitled to protection as trade secrets of such person, except that such information may be disclosed to any officers, employees or authorized representatives of the United States or the state concerned with carrying out RCRA or the state hazardous waste program or when relevant in any proceeding thereunder.