During the five (5) year preliminary approval period and prior to final expiration for all applications subject to this title, the land divider may divide the land division into two (2) or more phases subject to the approval of the Administrator. The land divider may stage the installation of minimum improvements and the survey of the land division according to the approved phasing scheme. When a land division is accomplished in phases, street standards required for each phase shall be calculated in consideration of the land division’s total number of lots. Said phasing shall provide for the orderly development and/or extension of roads, utilities and other improvements and amenities. The County may require that an appropriate percentage of planned special improvements and amenities are developed with each phase to provide for each phase in the event the total land division is never completed.