If the Township Committee shall determine that the improvement or improvements shall be constructed or installed under § 35-12-2.2.b above, the Planning Board shall estimate with the aid of the Township Engineer or such other persons as have pertinent information or expertise the amount, if any, by which the total cost thereof will exceed the total amount by which all properties, including the subdivision or tract, will be specially benefited thereby, and the subdivider or developer shall be liable to the Township for such excess. Further, the Township Committee shall adopt an ordinance authorizing and providing for the financing of the improvement or improvements in a manner consistent with the obligation of the subdivider or developer for any excess of total cost over total benefits conferred, as set forth above.