A sponsor may request an exemption from Part D of these rules. The request may ask exemption from all of the section or from selected ones. The request must be in writing and must be addressed to the apprenticeship supervisor. It must explain why an exemption is needed. An exemption may be granted either by the WSATC or by the secretary of the United States Department of Labor, but can only be granted for good cause. If the WSATC approves an exemption that affects a substantial number of employers, it must notify the United States Department of Labor explaining why the exemption was allowed.