Cal. Government Code § 53843

In any county which finds it necessary to borrow current operating requirements, as provided in the foregoing sections, the board of supervisors shall either: (1) Advertise for bids by publication for two weeks in a newspaper of general circulation in the county, setting forth the date upon which the amount will be required, which shall be not less than three weeks following the date of the first publication, the amount required and the repayment date. Bids shall be opened at the time set forth in the notice which shall be during a regular meeting of the board; and the board, unless it rejects all bids, shall accept the bid which offers the loan to the county at the lowest net interest cost not in excess of 10 percent, or (2) After finding that time is of the essence, direct the county treasurer to negotiate for a loan to the county and to solicit and receive bids without advertising for them. The board of supervisors, unless it rejects all bids, shall accept the bid which offers the loan to the county at the lowest net interest cost not in excess of 10 percent, or (3) After finding that any political subdivision subject to this article periodically requires advances of current operating requirements prior to receipt of tax revenues, direct the county treasurer, upon request of such political subdivision, to solicit and receive bids for loans from time to time without advertising for them. The board of supervisors, unless it rejects all bids, shall accept the bid which offers the loan to the county at the lowest net interest cost not in excess of 10 percent.