Any operator aggrieved by any decision of the Treasurer-Tax Collector with respect to the amount of such tax, interest, and penalties, if any, may appeal to the Board by filing a notice of appeal with the County Clerk-Recorder within fifteen (15) days after the service or mailing of the determination of the tax due. The Board shall fix a time and place for hearing such appeal, and the County Clerk-Recorder shall give notice in writing to such operator at his last known place of address. The findings of the Board shall be final and conclusive and shall be served upon the appellant in the manner prescribed in this chapter for the service of a notice of hearing. Any amount found to be due shall be immediately due and payable upon the service of notice.(§ 10, Ord. 525)