Section 20391 Of Article 25. Boards Of Supervisors—county Highways From California Public Contract Code >> Division 2. >> Part 3. >> Chapter 1. >> Article 25.

. Whenever the board of supervisors finds that the estimated expense of any necessary work upon any county highway exceeds the sum of twenty thousand dollars ($20,000), the board shall order definite surveys of the proposed work to be made and shall direct the preparation of profiles, cross sections, plans, and specifications.