(a) Council.--At least 5% of registered electors of the borough or, for a proposal affecting only a portion of the borough, at least 5% of the registered electors of the ward which would be affected by the proposal may petition council to initiate proceedings under section 601 (relating to creation and alteration) and may present to council a plot showing the boundaries of the proposed wards of the borough. Council shall, by motion approved by a majority of council and within 90 days of presentment of the petition, determine whether to initiate proceedings under section 601.

(b) Court of common pleas.--If council has not approved a motion within 90 days after the presentment of a petition under subsection (a), ten registered electors may petition the court of common pleas and contest the existing apportionment as violating section 601(b) or (d). The proceedings before the court shall be conducted in accordance with 53 Pa.C.S. §§ 906 (relating to contest of reapportionment by governing body) and 907 (relating to costs and expenses of contest).