It shall be unlawful for any person to store unsold stocks of fireworks remaining unsold after the lawful period of sale as provided in his permit except in such places of storage as the Fire Chief shall approve. Unsold stocks of fireworks remaining after the authorized retail sales period from 12:00 noon on June 28th to 12:00 noon on July 6th shall be returned on or before July 31st of the same year to the approved storage facilities of a licensed fireworks wholesaler, to a magazine or storage place approved by the Fire Chief or to a place approved by the State Fire Chief. Upon receiving a written application at least ten days prior to the date of proposed storage, the Fire Chief shall investigate whether the character and location of the storage would constitute a hazard to any property or be dangerous to any person. Based upon the investigation, the Fire Chief may grant or deny any application for storage or to subject the same to such reasonable conditions, if any, as he shall prescribe.