The Commission shall determine the method of publication of all notices, ordinances, and proceedings for which a mode of publication is not prescribed by this charter or by law. The Commission may determine that such publication may be made in a newspaper which is printed or circulated in the city, or that such publication may be made by posting in the office of the Clerk and in five (5) other public places in the city. In case publication is made by posting, a notice of such posting, setting forth by a descriptive phrase, the purpose of or nature of the notice, ordinance, or proceeding posted, and location of the places where posted, shall be published at least once in a newspaper published and circulated in the city within seven (7) days after such posting was done.
In any case in which this charter requires the mailing of notices, the affidavit of the officer or employee responsible for such mailing that such notice was mailed shall be prima facie evidence of such mailing.