It shall be a further requirement that the decision or determination of the City Planning Commission shall set forth each required finding in each specific grant of a special permit use, or modification of the use or bulk regulations, and in each denial thereof which of the required findings has not been satisfied. In any such case, each finding shall be supported by substantial evidence or other data considered by the Commission in reaching its final decision, including the personal knowledge of or inspection by the members of the Commission.

In no case shall a special permit for a proposed sewage treatment plant or pumping station under Section 74-73 of this Chapter be denied without a prior public hearing by the Commission. Such public hearing must be held by the Commission and decision given within six months of the date of filing of the request for such special permit with the Commission.