The chief, or such other persons as he shall designate, shall, after extinguishing a fire, make a prompt and thorough investigation of the cause of the fire, the time the fire began, the amount of loss and insurance, a description of the affected buildings and premises, and shall secure all other useful information available, and record the same in a record book kept for that purpose in the office of the department, and shall report the same to the governing body at such time as it may direct. (1991 Code § 2.24.080, as amended)