California Code, Public Contract Code - PCC § 2055

(a) The participating state or local agency seeking to challenge the certification determination made by another participating state or local agency shall give written notice to the certifying agency of its intention to challenge the certification determination.  The certifying agency shall reexamine its certification determination and submit written notice to the challenging agency and the business enterprise of its findings after reexamination within 30 days from the date of receipt of the notice.

(b) If the challenging agency is not satisfied with the finding of the certifying agency after reexamination, the challenging agency shall submit written notice to the business enterprise, with a copy to the certifying agency, of its intention to decertify the business enterprise.

(c) A business enterprise that has received notice of decertification by an agency may appeal that decertification decision in accordance with the procedures of the agency that made the decertification decision.