Cal. Gov. Code § 66451.20

Prior to amending a merger ordinance which was in existence on January 1, 1984, in order to bring it into compliance with Section 66451.11, the legislative body of the local agency shall adopt a resolution of intention and the clerk of the legislative body shall cause notice of the adoption of the resolution to be published in the manner prescribed by Section 6061. The publication shall have been completed not less than 30 days prior to adoption of the amended ordinance.