Concrete monuments depressed below street grade with cast iron ring and cover of a type approved by the city engineer shall be set at intersections of street centerline tangents or
off-sets therefrom, and where such intersect on private property at the beginning and end of centerline curve and/or off-sets therefrom. The exact location of all such monuments shall be shown on the final map before approval is requested. (Ord. 89 § 6.2(k), 1955).