(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 the 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)