Cal. Health & Safety Code § 38081

(a) Provisions shall be included in any invitation for bid or request for proposal issued and in any contract executed on or after January 1, 1996, in an amount that exceeds two hundred fifty thousand dollars ($250,000) by the State Department of Health Services, to permit the substitution of securities for any moneys withheld to ensure performance under a service or consulting service contract, provided that substitution of securities provisions shall not be required where federal regulations or policies, or both, do not allow the substitution of securities. At the request and expense of the contractor, securities equivalent to the amount withheld shall be deposited with the state department, or with a state or federally chartered bank in California as the escrow agent, who shall then pay the moneys to the contractor. Upon satisfactory completion of the contract, the securities shall be returned to the contractor.
(b) Alternatively, the contractor may request and the state department shall make payment of retentions earned directly to the escrow agent at the expense of the contractor. At the expense of the contractor, the contractor may direct the investment of the payments into securities and the contractor shall receive the interest earned on the investments upon the same terms provided for in this section for securities deposited by the contractor. Upon satisfactory completion of the contract, the contractor shall receive from the escrow agent all securities, interest, and payments received by the escrow agent from the state department, pursuant to the terms of this section. The contractor shall pay to each subcontractor, not later than 20 days of receipt of the payment, the respective amount of interest earned, net of costs attributed to retention withheld from each subcontractor, on the amount of retention withheld to insure the performance of the contractor.
(c) Securities eligible for investment under this section shall include those listed in Section 16430 of the Government Code, bank or savings and loan certificates of deposit, interest bearing demand deposit accounts, standby letters of credit, or any other security mutually agreed to by the contractor and the state department.
The contractor shall be the beneficial owner of any securities substituted for moneys withheld and shall receive any interest thereon.
Failure to include these provisions in bid and contract documents shall void any provisions for performance retentions in an affected contract.