(1) Upon the passage of a resolution of the legislative body of a noncharter code city, or upon the filing of a sufficient petition with the county auditor signed by registered voters in number equal to not less than ten percent of the votes cast at the last general municipal election therein, proposing abandonment by the city of the plan of government under which it is then operating and adoption of another plan, naming such plan
and its effective date, the sufficiency of the petition for abandonment shall be determined, an election ordered and conducted, and the results declared generally as provided in chapter
35A.02 RCW insofar as such provisions are applicable. If the resolution or petition proposes a plan of government other than those authorized in chapters
35A.12 RCW and
35A.13 RCW of this title, the resolution or petition shall specify the class under which such city will be classified upon adoption of such plan.