Four copies of the preliminary plat, one copy of an attorney’s title opinion addressed to the Commission, together with three copies of the owner’s statement, shall be filed with the Commission, and there shall forthwith be referred one copy of the plat and a copy of the owner’s statement to the City Engineer. The City Engineer shall examine said plat as to its compliance with the laws and ordinances of the City, the existing street system, and good engineering practices, and shall submit findings in duplicate to the Commission, together with the copy of the plat received. When the Engineer’s report is received by the Commission, it shall as soon as possible consider said report and pass upon the plat. It shall then set forth its recommendations in writing, whether of approval, modification, or disapproval. In case of modification or disapproval, it shall give its reasons therefor. The Commission shall forthwith submit all four copies of the preliminary plat, together with a copy of the owner’s statement, a copy of the Engineer’s report and a signed copy of its recommendations to the Council. The Council shall then take action upon the preliminary plat, certifying its approval or disapproval. In case of disapproval, it shall give its reasons therefor. If approved and all four copies duly certified, one copy shall be delivered to the Commission, one to the City Engineer, one to the City Clerk and the fourth shall be returned to the owner or subdivider. The approval of the preliminary plat by the Council does not constitute acceptance of the subdivision, but shall be authorization to proceed with the preparation of the final plat.