Cal. Gov. Code § 14955
Where work to be performed, excluding regular maintenance work, which would otherwise be subject to the State Contract Act (Chapter 1 (commencing with Section 10100) of Division 2 of the Public Contract Code), does not lend itself to the preparation of plans and specifications to enable bids to be taken on a lump-sum or unit basis, and the director so finds, the department may perform the work by the use of rented tools or equipment, either with operators furnished or unoperated. Contracts for the work may include provision for equipment rental and in addition the furnishing of labor and materials necessary to accomplish the work. The contracts shall not be subject to the State Contract Act, but shall be subject to all of the provisions of Article 2 (commencing with Section 1770) of Chapter 1 of Part 7 of Division 2 of the Labor Code.
Whenever the total consideration of such a contract exceeds two thousand five hundred dollars ($2,500), it shall be awarded to the lowest responsible bidder, after competitive bidding on such reasonable notice as the department may prescribe, except in cases of emergency rental of tools or equipment as hereinafter provided. Posting of notice for five days in a public place in the Sacramento and Los Angeles offices of the Office of Architecture and Construction of the department is sufficient. Those contracts involving a consideration in excess of two thousand five hundred dollars ($2,500) shall be accompanied by labor and material bonds. The department may require faithful performance bonds when considered necessary. The notice for each contract shall state whether or not a bond shall be required. Where a faithful performance bond is required, labor and material bonds shall be required.
In cases of emergency work necessitated by the imminence or occurrence of a landslide, flood, storm damage, accident, or other casualty, tools or equipment may be rented for a period of not to exceed 10 days without competitive bidding.
Ca. Gov. Code § 14955