(a)Time within which to file appeal. An appeal from an emergency or other immediately effective order of the Administrator must be filed within 10 days after the date on which the Administrator's order was served on the respondent. The respondent shall simultaneously serve a copy of the appeal on the Administrator.(b)Form and content of appeal. The appeal may be in letter form. It shall identify the certificate or certificates affected and indicate that an emergency or other immediately effective order of the Administrator is being appealed.