Cal. Unemployment Insurance Code § 1223

If any petition is filed under this article within the time and meeting requirements prescribed, an administrative law judge shall review the matter and, if requested by the petitioner, shall grant a hearing. A hearing is not required on a petition if a prior hearing has been afforded the petitioner involving the same issues, but regardless of any prior proceedings, if the petitioner files an affidavit setting forth new and additional evidence in support of his or her petition, an administrative law judge may grant an additional hearing. The administrative law judge shall give at least 20 days’ notice of the time and place of the hearing on a petition by delivering or mailing the notice to the petitioner and to the director. The time of notice may be shortened with the consent of the parties. The administrative law judge shall render a decision in the matter and may decrease or increase the amount of any assessment under review. Every employing unit or person which is a party to the petition and the director shall be promptly notified of the administrative law judge’s decision, together with his or her reasons therefor.