The preliminary plat of a subdivision is not intended to serve as a record plat.  Its purpose is to show on a map all facts needed to enable the Planning Commission to determine whether the proposed layout of the land in question is satisfactory from the standpoint of the public interest.  The preliminary layout should be planned by a qualified technician trained in the layout of subdivisions.  Plats containing five lots or less and not involving new streets may be exempted from the provisions of this chapter upon application to the Commission.
(1980 Code 152.30)