The applicant shall submit a planned unit development plan for the total area within the proposed development. If the planned unit development is to be developed on a phase basis, each phase shall be of such size, composition and arrangement that its construction, marketing and operation is feasible as a unit independent of any subsequent phases. Final approval shall be given only to one phase at a time. The county subdivision ordinance, as it now or hereafter exists, applies to all preliminary and final planned unit development plats. The general site plan shall show, where pertinent:
A. The use or uses, dimensions, sketch elevations, and locations of proposed structures;
B. Dimensions and locations of areas to be reserved and developed for vehicular and pedestrian circulation, parking, public uses such as schools and playgrounds, landscaping and other open spaces;
C. Total number of acres in proposed development;
D. Such other pertinent information, including, but not limited to, residential density, coverage and open space characteristics shall be included as may be necessary to make a determination that the contemplated arrangement of buildings and uses makes it desirable to apply regulations and requirements differing from those ordinarily applicable under this title. (1998 Code § 17.56.040)