The following industrial zones are established:
I-1, industrial district-1, an industrial district allowing a variety of industrial uses, controlled primarily by performance standards;
I-2, industrial district-2, an industrial district but having limitations regarding bulk, setbacks, and uses with performance standards. Including, industrial and office parks, veterinary clinics and veterinary laboratories. (Ord. 1000 § A(part), 1995).

The essential function of the I industrial zones is to provide a suitable area in which manufacturing is conducted. From each use located therein there shall be a minimum of air pollution, air contamination, emission of odor, gases, noise and the origin of sewage wastes which shall be controlled in accordance with the standards contained in this chapter. (Ord. 1000 § A(part), 1995).

Any manufacturing, reduction, assembling, warehousing or other light or heavy industrial uses permitted in any I zone, which are hazardous to public health, safety and welfare by reason of air contamination, air pollution, emission of odors, gas or noise, or emission of sewage wastes, shall conform to the performance standards contained hereinafter.
In addition, the permitted uses of each industrial zone are tabulated below:

¹ Retail sales are permitted within I-2 zone when specially approved by the planning commission and city council with the following conditions: (a) the proponent for the request is a not-for-profit organization related to an educational purpose; (b) the proposed location is within three hundred feet of an educational facility; (c) the use is limited to two years or less in an industrial location and the city council may grant two-year extensions; (d) the fire chief and building official must perform a safety inspection and any necessary safety improvements be completed prior to occupancy of the building; and (e) restrooms must be available for use at the site.

(Ord. 1293 § C, 2007; Ord. 1081 § D, 1999: Ord. 1061, 1998; Ord. 1000 § A(part), 1995).

The sale and service of products manufactured or assembled on-site is permitted as an accessory use to the primary use permitted above. This may include an area set aside for demonstration or exhibition purposes. Please refer to Section 17.01.030 for the definition of accessory use. (Ord. 1081 § E, 1999).

The following sections contain performance standards to be applied to any use permitted in any I zone. In applying the performance standards, the building inspector shall make or cause to be made all technical measurements and determinations relating thereto. (Ord. 1000 § A(part), 1995).

A. Air contaminants shall be less dark in shade than that designated as No. 1 on the Ringelmann Chart, as published by the United States Bureau of Mines, except that No. 2 is permitted for one three-minute period in any hour.
B. Air contaminants, of such an opacity as to obscure an observer’s view to a degree equal to or greater than described in subsection A of this section, shall not be permitted, except that smoke in the range of white or cream may be excepted by the application of this rule.
C. Particulate matter or dust, as measured at and by any generally accepted manner, shall not be emitted in excess of three-tenths grains per cubic foot, as corrected to a temperature of five hundred degrees Fahrenheit, except for one period of four minutes in any one-half hour, when it can equal but not exceed six-tenths grains per cubic foot, as corrected to a temperature of five hundred degrees Fahrenheit.
D. Particulate matter shall not be emitted to become deposited on the property of others in sufficient quantities and of such characteristics and duration as is, or is likely to be, injurious to human health, plant or animal life or property, or which unreasonably interferes with enjoyment of life and property. (Ord. 1077 § F, 1999: Ord. 1000 § A(part), 1995).

The emission of odors which are unreasonably offensive or obnoxious to any considerable number of persons within a residential zone shall be prohibited. (Ord. 1081 § G, 1999: Ord. 1000 § A(part), 1995).

The following gases, sulfur dioxide and hydrogen sulfide, shall not exceed 0.4 parts per million (PPM) or as shown in Table 1; carbon monoxide shall not exceed twenty-five parts per million; nitrous fumes shall not exceed five parts per million. All measurements shall be taken at the source of emission; provided, however, there shall not be discharged from any source whatsoever, such quantities of air contaminants or other material which cause injury, detriment, nuisance or unreasonable annoyance to any considerable number of persons, or to the public, or which endanger the comfort, repose, health or safety of any such persons, or the public, or which cause or have a natural tendency to cause injury or damage to business or property.

(Ord. 1081 § H, 1999: Ord. 1000 § A(part), 1995).

Smoke, dust, dirt and fly ash shall not exceed 0.3 grains per cubic foot of flue gas at stack temperature of five hundred degrees Fahrenheit, and not exceed fifty percent excess air, and shall in no instance be unclean, destructive, unhealthful or hazardous; nor shall visibility be impaired by the emission of a haze which unduly impedes vision with an apparent opaqueness equivalent to No. 2 of the Ringelmann Chart. (Ord. 1000 § A(part), 1995).

A. No waste shall be discharged into the public sewer system which is dangerous to the public health and safety. These standards shall apply at the point where wastes are discharged into the public sewer, or any stream of water or other drainage course. Acidity or alkalinity shall be neutralized within an average pH (unit of measurement of acidity) range of between 5.5 and 7.50 as a daily average on the volumetric basis, with a temporary variation of pH 4.0 to 10.0.
B. Wastes shall not contain cyanide, and no chlorinated solvents shall be in excess of 0.1 part per million. No sulfide, sulfur dioxide and nitrous oxide gases.
C. Wastes shall not contain any insoluble substances in excess of ten thousand parts per million, or exceed a daily average of five hundred parts per million, or fail to pass a No. 8 standard sieve, or have a dimension greater than one-half inch. Wastes shall not have a chlorine demand greater than fifteen parts per million. Wastes shall not contain phenols in excess of 0.05 parts per million.
D. Wastes shall not contain any grease or oil or any oily substances in excess of one hundred parts per million, or exceed a daily average of twenty-five parts per million. (Ord. 1000 § A(part), 1995).

Any manufacturing or industrial use shall meet the standards of the noise ordinance and the following subsections of the ordinance codified in this title. If there is a conflict between the ordinance codified in this title and the noise ordinance, the ordinance having the more stringent standards shall govern.
A. Automatic screw machines are permitted when operated with noise silencers and when located not less than two hundred feet from any zoned residential district.
B. Stamping machines, punch presses and press brakes shall be permitted when such machines shall be placed on shock-absorbing mountings and on a suitable reinforced-concrete footing.
C. No machine shall be loaded beyond capacity as prescribed by the manufacturer, and such machines may have a capacity up to fifty tons when located two hundred fifty feet from any residential zone or residential use, one hundred tons when located three hundred feet from any residential district or residential use, and one hundred fifty tons when located five hundred feet from any residential zone or residential use.
D. Hot forging, steam or bored hammers shall be permitted when located at least one thousand feet from any zoned residential district and/or existing residential use, and such operations shall be located within a masonry building on suitably reinforced concrete mat, or solid rock, and mounted on shock absorbers that reduce vibration to a reasonable minimum.
E. The noise in decibels, as measured at the street or property line, shall not exceed sixty-five decibels of sound, and shall be muffled so as not to become objectionable due to intermittence, beat, frequency or shrillness, and such noise shall not in any case exceed the street traffic noise during a normal day, when the employees arrive or leave the place of manufacturing. (Ord. 1000 § A(part), 1995).

Glare and heat shall be prohibited, and any glare and heat from arc welding, acetylene torch cutting or other similar processes shall be performed so as not to be seen from any city street or right of way or beyond the property line. Fire and safety hazards, the storage and handling of flammable liquids, liquefied petroleum gases and explosives shall comply with the most current standards established therefor by the National Fire Underwriters Association, and shall not be located within one thousand feet of any residential property or residential use. (Ord. 1081 § I, 1999: Ord. 1000 § A(part), 1995).

The following bulk, height and setback regulations are established for each industrial zone:

¹ May have “0” setback in Drayton Street and Judson Street I-2 areas.

² Higher height limits may be obtained by conditional use permit.

³ Once the required right-of-way for planned improvements has been acquired through dedication, setbacks shall be consistent with the setback requirements listed in this section.

Industrial properties on state highways shall not be smaller than five acres (three hundred foot minimum frontage), unless already existing or accessed solely by an access road other than a state highway. (Ord. 1051 § A(part), 1997; Ord. 1000 § A(part), 1995).