Section 29.26.140 - Sufficiency of petition(a) All copies of an initiative or referendum petition shall be assembled and filed as a single instrument. Within 10 days after the date the petition is filed, the municipal clerk shall (1) certify on the petition whether it is sufficient; and(2) if the petition is insufficient, identify the insufficiency and notify the contact person by certified mail.(b) A petition that is insufficient may be supplemented with additional signatures obtained and filed before the 11th day after the date on which the petition is rejected.(c) A petition that is insufficient shall be rejected and filed as a public record unless it is supplemented under (b) of this section. Within 10 days after a supplementary filing the clerk shall recertify the petition. If it is still insufficient, the petition is rejected and filed as a public record.