When an act is required by an ordinance, the same being such that it may be done as well by an agent or deputy as by the principal, such requirement shall be construed to include all such acts performed by an authorized agent or deputy. Whenever a power is granted to, or a duty is imposed upon, a public officer or employee, the power may be exercised or the duty may be performed by a deputy of such officer or employee or by a person otherwise duly authorized pursuant to law or ordinance, unless an ordinance of the city expressly provides otherwise. (Ord. 156 § 5, 1996)