Cal. Sts. & Hy. Code § 1052
The petitioner shall accompany the petition with a bond, approved by the board of supervisors, in double the amount of the probable cost of the proceedings, including the market value for land taken and any severance damage resulting from the taking, and shall be conditioned that the petitioner will pay all costs of the proceedings, including any compensation which may be awarded to any landowner. The bond shall be further conditioned that the petitioner will pay to the person over whose land the private byroad is sought to be opened or altered, the necessary costs and disbursements in contesting the opening or alteration of the private byroad, in case the petition is not granted or the private byroad is finally not opened or altered.
Ca. Sts. and High. Code § 1052