California Public Contract Code
This article shall apply to contracts subject to the State School Building Aid Law of 1949 provided for in Chapter 4 (commencing with Section 15700) of Part 10 of the Education Code.
A school district shall not expend money apportioned under the State School Building Aid Law unless the contracts under which the funds are expended have been let after competitive bids pursuant to the Education Code.
All bids for construction work shall be presented under sealed cover and shall be accompanied by one of the following forms of bidder's security:
(b) A cashier's check made payable to the school district.
(c) A certified check made payable to the school district.
(d) A bidder's bond executed by an admitted surety insurer, made payable to the school district.
Upon an award to the lowest bidder, the security of an unsuccessful bidder shall be returned in a reasonable period of time, but in no event shall that security be held by the school district beyond 60 days from the time the award is made.