1.   Application. In all zoning districts the following requirements shall apply. No use that does not conform to the following standards of use, occupancy, and operation shall be permitted within the City. These standards are established as the minimum requirements to be maintained within the City.

2.   Noise. At no point along any lot line in a residential district shall the sound pressure level of any individual operation or plant exceed a sound level of 50 decibels. Objectionable sounds of an intermittent nature shall be controlled so as not to become a nuisance to adjacent uses. Sound levels shall be measured with a sound level meter and associated octave band filter manufactured according to standards described by the American Standards Association.

3.   Odor. No emission of odorous gases or other odorous matters in such quantity as to be offensive at the lot lines or beyond shall be permitted. Any process which may involve the creation or emission of any odors shall be provided with a secondary safeguard system so that control will be maintained if the primary safeguard system should fail.

4.   Glare or Heat. Any operation producing intense glare or heat shall be performed within a completely enclosed building so that no operation will produce heat or glare beyond the property line of the lot on which the operation is located.

5.   Radiation. No activity involving ionizing radiation shall be permitted which will cause radiation at any point on or beyond any lot line in excess of United States Bureau of Standards specifications for radiation protection.

6.   Vibration. Every use shall be so operated that the ground vibration inherently and recurrently generated is not perceptible, without instruments, at any point on or beyond any lot on which the use is located.

7.   Smoke. There shall be no emission of smoke from any source whatever to a density greater than that density allowed by the applicable laws and regulations of the State of Iowa.

8.   Toxic or Nontoxic Matter. No use shall for any period of time discharge any toxic or nontoxic matter in such concentration as to be detrimental to or endanger the public health, safety, comfort, or welfare or cause injury or damage to property or business.

9.   Dust or Dirt. No emission which can cause any detrimental effects to human beings, animals, or vegetation, or of property, or which can cause any excessive soiling at any point and in no event any emission from any chimney or otherwise of any solid or liquid particles in concentration exceeding the minimum requirements of the applicable laws and regulations of the State of Iowa.

10.   Fire and Safety. Incombustible to moderate burning materials shall be permitted freely, provided such outdoor storage conforms with the other requirements in this chapter. Free or active burning to intense burning materials shall be enclosed with incombustible walls and shall be set back at least 40 feet from any lot line or shall be protected with automatic sprinklers. Materials or products which produce flammable or explosive vapors under ordinary weather temperatures shall be prohibited.

11.   Liquid or Solid Wastes. No discharge of any materials, at any point into any private sewage disposal system, or stream, or into the ground, in any such way or of such nature or temperature as can contaminate any water supply or otherwise cause the emission of dangerous or objectionable elements, shall be permitted except in accordance with the standards approved by the Iowa Department of Health. No accumulation of solid waste conducive to the breeding of rodents or insects shall be permitted and no materials or wastes shall be deposited upon any lot in such form or manner as may be transferred off of that lot by natural causes or forces.