The clerk shall accept only nomination petitions which conform with the forms provided and maintained by him, and which, considered together, contain the required number of valid signatures for candidates having those qualifications required for the respective elective city offices by this Charter. When a petition is filed by persons other than the person whose name appears thereon as a candidate, it shall be accepted only when accompanied by the written consent of the candidate. The clerk shall, forthwith after the filing of a petition, notify in writing any candidate whose petition is then found not to meet the requirements of this section, but the failure to so notify any candidate shall in no way prevent a final determination that the petition does not meet such requirements. Within there days after the last date of filling petitions, the clerk shall make his final determinations as to the validity and sufficiency of each nomination petition and whether or not the candidate has the qualifications required for his respective elective city office by this Charter and shall write his determinations thereof on the face of the petition and shall notify in writing the candidate whose name appears thereon of his determinations. Such notice to any candidate whose petitions are so found to be invalid or insufficient shall be allowed to file supplementary or replacement petitions before 4:00 o'clock in the afternoon on the sixth day after the last date for filing original petitions. The names of the candidates for the respective elective city offices who file valid and sufficient nomination petitions shall be certified by the clerk to the election commission to be placed upon the ballot for the next subsequent regular city election or the next special election for the filling of vacancies in office, as the case may be.