California Code, Streets and Highways Code - SHC § 5700

The engineer or where there is no engineer, an engineer of work shall be the proper officer to do the surveying and other engineering work necessary to be done under this division, and to survey and measure the work to be done under contracts for grading, macadamizing, or improving streets and other work done under this division, and to estimate the costs and expenses thereof, and perform such other duties under this division as may be directed by the legislative body.  Every certificate signed by him in his official capacity shall be prima facie evidence in all courts in this State of the truth of the contents.  He shall also keep a record of all surveys made under the provisions of this division, as in other cases.

In a county having a population of 4,000,000 or over, a registered civil engineer, registered pursuant to Chapter 7, Division 3 of the Business and Professions Code, shall be the proper person to do any work required to prepare plans pursuant to Section 5130.