No ordinance shall become effective until thirty days after the date of its final passage, except an ordinance calling or otherwiserelating to an election and except an ordinance for the immediate preservation of the public peace, health or safety, which contains a declaration of and the fact constituting its urgency and is passed by a unanimous vote of the members present at the time of such adoption, and except ordinances relating to street improvement proceedings and other ordinances governed by particular provisions of state law prescribing the manner of their passage and adoption.

The adoption of an ordinance may be suspended, reconsidered, submitted to voters and acted upon pursuant to referendum proceedings held under and in compliance with the provisions set forth under Division 4, Chapter 3, Article II of the Elections Code of the State of California, and amendments thereto.