California Code, Public Resources Code - PRC § 7530

Any person desiring to purchase lands, as provided in this article, which have been segregated by authority of the United States, but which have not been sectionized by the same authority, shall apply to the surveyor of the county in which the land is situated, to have the land which he desires to purchase surveyed. A certificate of such survey shall be attached to the affidavit required for the purchase of the lands. All surveys required of county surveyors by this section shall conform, as nearly as practicable, to the system adopted by the United States for the survey of the public lands.