(a) Within 30 days after the approved subdivision final plat has been filed and recorded in the office of the county clerk, and prior to commencement of construction, the subdivider or property owner shall cause a registered surveyor to install permanent concrete monuments to be erected on the corner and end of all property to be dedicated to the city for streets, parks, playgrounds or other public purposes. He shall also install such monuments at corners of the blocks.

(b) Where angles and curves occur in street or easement lines, such monuments shall be placed at all angle points, points of curve and points of tangency. When the monuments have been installed, the registered surveyor shall notify the city engineer, who will then inspect the installation in the presence of the registered surveyor. If the work has been completed satisfactorily, in the opinion of the city engineer, he will notify both the owner and the registered surveyor in writing that such work meets the requirements of this section.

(c) The monuments must be of such material and size as approved by the city engineer.

(d) Iron pipes shall be placed at all lot corners.