Approval or disapproval of the preliminary plat shall be conveyed to the subdivider within five days after the Planning Commission’s public hearing at which the plat was considered. If the plat is disapproved, the subdivider shall be notified of the reason for such action and what requirements shall be necessary to meet the approval of the Planning Commission. The approval of the preliminary plat does not constitute an acceptance of the subdivision, but is deemed to be an authorization to proceed with the preparation of the final plat. This approval of the preliminary plat shall only be effective for a period of six months, unless an extension is granted by the Planning Commission. If the final plat has not been submitted for approval within this specified period, a preliminary plat must be resubmitted to the Planning Commission for approval. (Code 1981 § 41-52. Code 1995 § 134-78.)