Before commencing construction or installation of a required improvement, the subdivider shall deposit with the city:
(a) For inspection of sewers and appurtenant facilities, the sum required by the city ordinance entitled sanitary sewer and industrial waste ordinance;
(b) For inspection of other improvements, a sum estimated by the city engineer to be adequate to cover the actual cost of inspection.
(Ord. 537 § 2 (part), 1985)