California Code, Education Code - EDC § 18557

At the time and place designated in the notice for hearing the request, or at any subsequent time to which the hearing may be postponed, the supervisors shall hear any reasons that may be submitted for or against the granting of the request.  If, before the conclusion of the hearing, a petition signed by registered voters within the district equal to not less than 10 percent of the vote cast within the boundaries of the district for all candidates for governor at the last gubernatorial election requesting an election is not filed, the board of supervisors may, if they determine it to be for the best interests of the library district, grant the request.  In such event, they shall make and enter an order in the minutes of their proceedings that the unsold bonds shall be sold and the proceeds used for the purposes specified in the request.