After all proper permits have been secured, an inspector appointed by the Harbor Engineer shall be present on board the ship during the entire time when explosives are being loaded into, or are unloaded from the ship, and he shall be especially charged with the supervision of such loading and unloading. The cost of such inspection to be borne by the agents, owners, consignees, or stevedores. A sufficient sum to cover such cost shall be deposited with the Harbor Engineer at the time of obtaining the permit. City Code, 1927, art. 15, §62 1950, art. 11, §64 1966, art. 10, §63 1976/83, art. 10, §63 Ord. 13-336