No person shall use or cause to be used any hydrocyanic acid, cyanogen or cyanide gas for the purpose of fumigating any building or other enclosed space in the City without a permit from the Clerk or otherwise than in accordance with the terms of said permit or the regulations as herein provided.
The rules and regulations governing the fumigation of any building or enclosed space in the City by hydrocyanic acid, cyanogen or cyanide gas shall be those adopted by the United States Department of Agriculture.
Applications to use hydrocyanic acid, cyanogen or cyanide gas for fumigating purposes shall be made on the blank forms furnished by the Clerk. Permits issued as provided herein shall remain in force until the 31st day of December, unless sooner revoked by the Council.
It shall be the duty of every holder of a permit issued in accordance with the provisions of this article to notify the Police and Fire Departments of the City of the location of the building or enclosed space to be fumigated, as well as its character and use and the date and time when fumigation will be performed. This notification shall be given as aforesaid at least 24 hours prior to the commencement of such fumigation. No such fumigation shall be performed unless the Police and Fire Departments have been notified in accordance with the requirements of this regulation.
No building or enclosed space shall, during the period of fumigation, be occupied by human beings. It shall be the duty of the holder of the permit to make or cause to be made a careful examination of all parts of such building or enclosed space in order to verify that no human beings have remained therein and that all necessary precautions have been undertaken to safeguard the lives and health of all persons occupying buildings adjoining that in which the fumigation is to be performed.
All crevices, cracks or openings in the building or portion thereof fumigated leading to the outer air or into adjoining buildings shall be effectively sealed so as to prevent the escape of gas during the process of fumigation.
The materials used in fumigating shall be placed in one or more receptacles of adequate size in the room or rooms to be fumigated after all openings, except the one used for entry and exit of the operator, are properly sealed. The operator placing the sulfuric acid and cyanide shall be properly protected and safeguarded by suitable properly tested mask and gloves. He alone shall be allowed in the room or rooms to be fumigated during the placing of the chemicals and until fumigation is completed and the premises are properly ventilated and made safe for occupancy.
A. 
Prior to the fumigation, suitable warning signs shall be posted on all doors or entrances to the premises to be fumigated, as follows:
(Skull and Crossbones)
DANGER
FUMIGATING WITH CYANIDE GAS
DEADLY POISON
(Skull and Crossbones)
ALL PERSONS WARNED
TO KEEP AWAY
B. 
Such signs shall be printed in red ink on white cardboard, letters to be at least two inches in size. At night such signs shall be illuminated so as to make the reading matter thereon plainly legible.
During the period fumigation is in process a capable, alert watchman or watchmen shall remain on duty at the entrance or entrances to the building or enclosed space fumigated and until the fumigation is completed and the premises are properly ventilated and made safe for occupancy.