Cal. Pub. Res. Code § 707

Whenever the department has received and deposited any money in the State Treasury to the credit of the General Fund in an excessive amount or in error, or whenever a refund of all or a portion of such money is due any person, firm, or corporation because of the termination of an agreement or other lawful reason, payment of such refund shall be made upon the filing of a claim by the director with the State Controller. The State Controller shall draw his warrant for payment of the refund from any appropriation made for that purpose.