The owner or owners, occupant or occupants, tenant or tenants of premises abutting or bordering upon any street in the City shall remove all snow and ice from the abutting sidewalks of such streets or, in the case of ice which may be so frozen as to make removal impracticable, shall cause the same to be thoroughly covered with sand or ashes, within 12 daylight hours after the same shall fall or be formed thereon.