. . "At such time as the indebtedness, including interest for said facility has been retired, then the additional assessments authorized by the amendments to paragraphs (a) and (b) by House Bill No. 1469, 1989 Regular Session, shall be paid by the State Tax Commission on a monthly basis directly to the City of Natchez to be used by the City of Natchez for the purpose of operation and maintenance of the" . .