The purpose of this code is to protect the public health. Owners and operators of food service establishments are to operate their premises in such a way as to avoid imminent health hazards. Health hazards in operation, when called to their attention by the representative of the permit-issuing official, are to be corrected immediately. Deficiencies, other than imminent health hazards, such as poor sanitary practices, are to be corrected in accordance with a schedule approved by the permit-issuing official.