All work done under and in pursuance of the permit mentioned in MMC 12.04.030 shall be done under the supervision of the city engineer, who, upon the completion thereof, shall inspect said improvement, and by actual survey test the grade thereof. If the same is satisfactory, he shall give a certificate therefor to the effect that the improvement is upon the proper grade and that the work and material conform with the provisions of this chapter, and the improvement is accepted. Thereafter, so far as such improvement extends, and while the same remains in good order, it shall be deemed a completion of that part of any improvement ordered by the council to be made upon such street. (Ord. 2763 §4, 1958).