It shall be the duty of the fire chief to make an investigation as to whether the public display as proposed by the applicant for a permit pursuant to this article is of a character and the display is in a location and the manner of discharge or firing, in the opinion of the fire chief after proper inspection, shall not be hazardous to property or endanger any person. The fire chief shall inform the city treasurer of the results of his investigation. The fire chief may require the applicant for the permit to make such changes in the character, location and method of discharging and firing as deemed by the fire chief to be in the interest of public safety as a condition to approving the permit application. The permit shall be for a period of time designated on the permit, but shall be for not more than the one day intended for the public display or a date to which the display is postponed because of inclement weather conditions. The permit shall be nontransferable. If the application is denied by the fire chief, he shall notify the applicant of the denial in writing. No public display of fireworks shall be of such a character and so located, discharged, or fired as to be hazardous or dangerous to persons or property, and this determination shall be within the sound discretion of the fire chief after proper inspection of the public property.