All petition papers comprising an initiative, referendum or recall petition shall be assembled and filed, with the city secretary as one instrument. Within ten days after a petition is filed, the city secretary shall determine whether each paper of the petition is properly attested and whether the petition is signed by a sufficient number of voters. The city secretary shall declare any petition paper entirely invalid which is not attested by the circulator thereof as required by Article VIII, Section 1, of this Charter. Upon completing his/her examination of the petition, the city secretary shall certify the result of his/her examination to the commission. If the city secretary shall certify that the petition is insufficient, the city secretary shall set forth in his/her certificate the particulars in which it is defective and shall at once notify the committee of the petitioners of his/her finding.