765 ILCS 220/9

When a monument record is recorded pursuant to this Act, it shall be the duty of the land surveyor to reconstruct or rehabilitate the corner monument and accessories to such corner and, if practicable, affix securely to the top of such monument established after the effective date of this Act the Illinois registration number of the land surveyor responsible for the establishment of such monument or position thereof and the same shall be left by him in such physical condition that it remains as permanent a monument as is reasonably possible and so that same may be reasonably expected to be located with facility at all times in the future.