§ 10.15  EFFECTIVE DATE OF ORDINANCES.
   (A)   Ordinances take effect 30 days after their final passage.
   (B)   An ordinance takes effect immediately, if it is an ordinance:
      (1)   Relating to an election;
      (2)   For immediate preservation of the public peace, health or safety, containing a declaration of the facts constituting the urgency, and is passed by a four-fifths vote of the City Council;
      (3)   Relating to street improvement proceedings;
      (4)   Relating to taxes for the usual and current expenses of the city; or
      (5)   Covered by particular provisions of law prescribing the manner of its passage and adoption.
(Cal. Gov't Code § 36937)