It will be necessary for each person, company or corporation engaged in the business of surveying within the limits of the City of Mill Valley, for the purpose of perpetuating all monuments that may be established or which may for the purpose of rerunning surveys, be located and uncovered, to place a suitable monument made of indestructible matter, such as a concrete block with a copper spike or rod set therein, the same to take the place of all wood or metal monuments that were originally established by former surveys.
(Ord. 140 § 1, November 10, 1908)