Cal. Pub. Cont. Code § 22031

(a) Prior to January 1, 2013, this article shall not prohibit a board of supervisors or a county road commissioner from utilizing, as an alternative to the procedures set forth in this article, the procedures set forth in Article 25 (commencing with Section 20390) of Chapter 1.
(b) On or after January 1, 2013, this article shall not prohibit a board of supervisors or a county road commissioner from utilizing, as an alternative to the procedures set forth in this article, the procedures set forth in Article 25 (commencing with Section 20390) of Chapter 1 for both of the following:
1. (1) Maintenance and emergency work.
2. (2) New road construction and road reconstruction as long as the total value of the new road construction and the road reconstruction performed under the procedures set forth in subdivision (c) of Section 20395 during a fiscal year does not exceed 30 percent of the total value of all work performed by force account other than maintenance as reported in the Controller’s Streets and Roads Annual Report as of March 1 of each year prior to the fiscal year.
(c) The value of force account work necessary to facilitate capital projects for the purpose of contracting to the private sector, including design, engineering, inspection, testing, and other force account work necessary to administer private contracts, shall be excluded from the 30-percent limit in subdivision (b).
(d) The value of force account work necessary to facilitate projects performed by county employees, including design, engineering, inspection, testing, and other force account work necessary to administer work performed under subdivision (b), shall apply to the 30-percent limit in subdivision (b).
(e) On or after January 1, 2013, for a county with a population of less than 50,000, this article shall not prohibit a board of supervisors or a county road commissioner from utilizing, as an alternative to the procedures set forth in this article, the procedures set forth in Article 25 (commencing with Section 20390) of Chapter 1.
(f) The requirements set forth in Section 22038 shall apply to any county subject to this section.
(g) Any county board of supervisors or county road commissioner acting pursuant to the authority granted in paragraph (2) of subdivision (b) shall publicly declare its intention to use this authority prior to commencing work. The public declaration may be on a project-by-project basis, via a list of anticipated projects for the fiscal year, or via a list that may be included in the county’s annual budget.