The Director of Public Works shall, from time to time, prepare plans which shall designate by means of a map of the City streets a uniform method of street tree planting, zoning certain streets for a certain specimen of tree or trees, and shrub or shrubs, showing the distance apart of said trees and shrubs, and the place where each tree or shrub is to be planted, and shall submit said plan to the chief administrative officer for approval or modification. After the same has been approved by the chief administrative officer, the same shall be submitted to the City Council for modification or approval, and adoption by that body. Said plan shall then become the tree planting plan for the streets of the City, and shall be strictly adhered to in all future street planting improvement projects and in the removal and replacement of trees, shrubs and plants on the streets of the City. Said uniform plan of tree planting may, but need not be, adopted by the City Council at one time, but the Council may adopt said plan for different portions of the City within a reasonable length of time after the completed plan for any particular portion of the City has been submitted to the City Council. Copies of said plan, or portions thereof, shall be kept on file in the office of the Director of Public Works and may be obtained by the public. (Ord. 1205 § 2, 1969; prior code § 27.821).