Cal. Gov. Code § 66498
In the event of the death, disability or retirement from practice of the engineer or surveyor charged with the responsibility for setting monuments, or in the event of his refusal to set such monuments, the legislative body may direct the county surveyor or city engineer, or such engineer or surveyor as it may select, to set such monuments. If the original engineer or surveyor is replaced by another, the former may, by letter to the county surveyor or city engineer, release his obligation to set the final monuments to the surveyor or engineer who replaced him. When the monuments are so set, the substitute engineer or surveyor shall amend any map filed pursuant to this division in accordance with the provisions of Sections 66469 to 66472, inclusive. All provisions of this article relating to payment shall apply to the services performed by the substituted engineer or surveyor.
Ca. Gov. Code § 66498