Any proposed ordinance may be submitted to the council by petition signed by registered electors of the city, equal in number to the percentage hereinafter required. The procedure in respect to such petition shall be the same as provided in Sections 28 and 29, Article III, of this Charter, with such modifications as the nature of the case requires, except that no blank forms shall be furnished or preliminary affidavit made.
If the petition accompanying the proposed ordinance be signed by registered electors equal in number to at least ten per centum of the last preceding vote cast in the city for all candidates for Governor of the State of Colorado, and contains a request that said proposed ordinance be submitted to a vote of the people, if not passed by the council, the clerk shall thereupon ascertain and certify its number of qualified signers; whereupon, if such certificate shows the required number of qualified signers, the council shall within twenty days thereafter, either--
(a) 
Pass said ordinance without alteration (subject to the referendum vote provided in this article); or
(b) 
Call a special election, unless a general or special municipal election is to be held within ninety days thereafter; and at such general or municipal election said proposed ordinance shall be submitted without alteration to the vote of the registered electors of the city.
If the petition be signed by registered electors equal in number to at least five per centum but less than ten per centum of the last preceding vote cast in the city for all candidates for Governor of the State of Colorado, as shown in the manner hereinbefore provided, and said proposed ordinance be not passed without alteration by the council within forty days, as provided in the preceding section, then such proposed ordinance, without alteration, shall be submitted by the council to electoral vote at the next general municipal election, if any, occurring within sixty days thereafter. If filed before sixty days, or within forty days of such election, said petition shall be invalid.
No ordinance passed by the council shall take effect before thirty days after its final passage and final publication, except an emergency ordinance, as provided in Article VI of this Charter. If, within said thirty days, a petition signed by registered electors of the city equal in number to at least ten per centum of the last preceding vote cast in the city for all candidates for Governor of the State of Colorado, be presented to the council, protesting against such ordinance taking effect, the same shall thereupon and thereby be suspended from taking effect, the council shall immediately reconsider such ordinance, and if the same be not entirely repealed, the council shall submit it, by the method provided in this article, to a vote of the registered electors of the city, either at the next general municipal election, or at a special election, which may, in their discretion, be called by them for that purpose, and such ordinance shall not take effect unless a majority of the registered electors voting on the same at such election, shall vote in favor thereof.
The procedure in respect of such referendum petition shall be the same as provided in Sections 28 and 29 of Article III of the Charter, with such modifications as the nature of the case requires, except that no blank forms shall be furnished or preliminary affidavit made.
The council may, of its own motion, submit to electoral vote for adoption or rejection at a general or special municipal election, any proposed ordinance or measure, or a proposition for the repeal or amendment of any ordinance, in the same manner and with the same force and effect as provided in this article for submission on petition. If the provisions of two or more proposed ordinances or measures, adopted or approved at the same election, are inconsistent, then the ordinance or measure receiving the highest affirmative vote shall prevail.
Whenever any proposed ordinance is required by this Charter to be submitted to the voters of the city at any election, the council shall cause it to be published as required of other proposed ordinances.
The ballots used when voting upon such proposed ordinance shall state the nature of the ordinance in terms sufficient to identify it, and, on separate lines, the words, “For the Ordinance,” and “Against the Ordinance.” If a majority of the registered electors voting on said proposed ordinance shall vote in favor thereof, the same shall thereupon become an ordinance of the city.
There shall not be held under this article more than one special election in any period of six months.
An ordinance adopted by electoral vote cannot be repealed or amended except by electoral vote.