California Code, Elections Code - ELEC § 12327

(a) If the precinct board members for any precinct have not been appointed or cannot serve, or the polling place has not been designated prior to an election, the county elections official shall, by written order, immediately appoint the precinct board members or designate the polling place for the precinct, as the case may require, and shall notify each precinct board member of the appointment.

(b) If, at this time, the elections official cannot make suitable arrangements for a polling place in any precinct in which none has been designated, the elections official may designate a polling place in any contiguous precinct. Any precinct board member serving in this polling place shall be regarded as serving in the proper precinct within the meaning of this chapter.