In the event of a dispute of the findings of a chemical analysis between or among two or more accredited laboratories or between an accredited laboratory and a laboratory of the department, an appeal analysis may be requested by letter, telegram, or other writing to the director. The sample to be analyzed in the appeal analysis shall be submitted to the headquarters laboratory of the department at Sacramento. The cost of the appeal analysis, including any sampling or shipping required, shall be at the expense of the requesting party. The findings from the appeal analysis are binding on all parties.