When a plat is filed with the Manager, he shall examine it to determine whether or not it complies with the requirements of Sections 1105.02 through 1105.04, inclusive. The Manager shall refer the examination of the plat to the Village Engineer. If the plat does not meet the requirements, the Manager shall return it to the owner who shall revise and refile it. If the plat meets the requirements, the Manager shall lay it before the Planning and Zoning Commission at its next meeting. The Commission shall thereupon examine it and approve it within thirty days if it is satisfied that it complies in all respects with this chapter. The approval of the Planning and Zoning Commission shall be indicated in writing on two copies of the preliminary plat which will be returned to the owner and surveyor. The remaining four copies bearing the notation of approval shall remain on file in the office of the Manager, available to the public. The approval of a preliminary plat shall be effective for a maximum period of twelve months, unless extended in writing by the Planning and Zoning Commission.