A preliminary plan is sufficient if it:
1. Describes the boundaries of the redevelopment area.
2. Contains a general statement of the uses of the land, layout of principal streets, densities of population and intensities and standards of building proposed for the redevelopment of the area.
3. Shows how the purposes of this chapter would be attained by such redevelopment.
4. Shows that the proposed redevelopment conforms to the master or general plan for the community.