§ 4.9. Permanent markers.

4.901
Permanent monuments consisting of a metal pipe one inch in diameter and four feet long shall be set in concrete six inches in diameter by 18 inches long at all street corners at all points where the street lines intersect the exterior boundaries of the subdivision and at angle points and points of curve in each street. The top of the monuments shall be set flush with the finished grade.

4.902
For all subdivisions of five lots or more, a permanent benchmark shall be accessibly placed, the elevation of which shall be based on mean sea level as determined by the U.S. Geological Survey and accurately noted on the subdivision plat. Such permanent benchmark shall be brass capped, set in concrete, with a minimum dimension of six inches in diameter, four feet long with a flat top. The top of the brass monument shall have an indented cross to identify properly the location and shall be set flush with the finished grade stamped with one-half-inch numbers.

4.903
All other lot corners shall be marked with an iron pipe, not less than three-fourths-inch diameter and three feet long driven so as to be flush with the finished grade.