N.J. Stat. Ann. § 40:69A-187

All petition papers comprising an initiative or referendum petition shall be assembled and filed with the municipal clerk as one instrument. Within twenty days after a petition is filed, the municipal clerk shall determine whether each paper of the petition has a proper statement of the circulator and whether the petition is signed by a sufficient number of qualified voters. After completing his examination of the petition, the municipal clerk shall certify the result thereof to the council at its next regular meeting. If he shall certify that the petition is insufficient he shall set forth in his certificate the particulars in which it is defective and shall at once notify at least two members of the Committee of the Petitioners of his findings.