1. Durable iron monuments shall be placed at all lot and block corners, at all angle points in any line, at each of all curves, and at such other points as may be required by the City Engineer, in accordance with the survey monumentation of Chapter 355 of the Code of Iowa.
2. The external boundaries of the subdivision, block corners, angle points and ends of curves shall be monumented in the field by iron rods of one-half inch to five-eighths-inch diameter or pipes of three-fourths-inch to one-inch diameter at least 30 inches long.
3. All lot corners and other points not referred to in Subsection 2 of this section shall be monumented in the field by iron rods of one-half inch to five-eighths-inch diameter or pipes of three-fourths-inch to one-inch diameter at least 24 inches long.
4. All monuments shall be properly set flush with the ground by a licensed land surveyor within one year after approval of the final plat. The surveyor shall affix a cap of inert material bearing an embossed or stencil cut marking of the Iowa registration number of the surveyor on the top of each monument.