Acceptable monuments and markers

The following shall be acceptable forms of Monuments and Markers: (1) disks or plugs, made of durable material set in ledge or concrete and marked with a hole or cross; (2) monuments 4″ (10cm) square by 30\" (.75m) long (minimum) of stone or reinforced concrete and marked with a hole or a cross. Some ferrous material shall be placed adjacent to the stone monuments as an aid to recovery; (3) drill holes ⅜″ (10mm) diameter by ½″ (13mm) deep (minimum) or cross cuts ⅜″ (10mm) deep (minimum) in ledge, concrete or the base stones of walls; (4) metal rods ½″ (13mm) O.D. (minimum) or metal pipes ½″ (13mm) I.D. (minimum) or bar stock of equivalent cross sectional area, having sufficient length to be deemed permanent; (5) nails and spikes that are sufficient in size and are set in pavement in a manner so as to be deemed permanent; (6) foundation corners; and (7) other materials or objects deemed permanent by the surveyor.