Safety. There shall be no land use or activity within the vicinity of the proposed day-care center which would pose a threat to the health, safety and welfare of the users of the facility. Specifically, there shall be no objectionable or unsafe levels of noise, vibration, fumes, odors, dust, glare, heat, toxic gases, electric or electronic interference, liquid wastes or sewage, vehicular loading and unloading activities and any other physical activity on sites within the vicinity of the proposed day-care center.