(a) Permanently installed markers which are adequate for a resurvey of the subdivision shall be shown on the record plat.
(b) In each plat of ten or less lots there shall be set at least four permanent markers; in each plat containing more than ten lots there shall be placed as many additional permanent markers as the surveyor deems necessary to properly control his original survey. Such permanent markers shall be made of solid iron pins at least one inch in diameter and at least thirty inches long, and driven to thirty inches below finished grade. As part of the As-Built Drawings (refer to Section 1169.04(c)), the subdivider must submit locations and elevations for all markers.
(c) In addition to permanent markers, at each corner of each inlot shall be set a solid iron pin not less than one-half inch in diameter and thirty inches in length.