(A) General. These performance standards shall apply as minimum standards in those districts where compliance with the standards is required.
(B) Limited industrial performance standards. To be permitted industrial use in the I-1 Industrial District, whether as a permitted use or through a special permit, the use must meet the following performance standards.
(1) Physical appearance. All operations shall be carried on within an enclosed building except that new materials or equipment in operable condition may be stored in the open. Normal daily wastes of an inorganic nature may be stored in containers not in a building when the containers are not readily visible from the street.
(2) Fire hazard. No operation shall involve the use of highly flammable gases, acid, liquids, grinding processes or other inherent fire hazards. This provision shall not be construed to prohibit the use of normal heating fuels, motor fuels, and welding gases when handled in accordance with city regulations.
(3) Noise. No operation shall be carried on which involves noise in excess of the normal traffic noise of the adjacent street at the time of the daily peak hour of traffic volume. Noise shall be measured at the property line and when the level of the noise cannot be determined by observation with the natural senses, suitable instrument may be used and measurement may include break-downs into a reasonable number of frequency ranges.
(4) Sewage and liquid wastes. No operation shall be carried on which involves the discharge into a sewer, water course, or the ground of liquid wastes of any radioactive nature, or liquid wastes of a chemical nature which are detrimental to normal sewage plant operation or corrosive and damaging to sewer pipes and installations.
(5) Air contaminants.
(a) Air contaminants and smoke shall be less dark than designated Number One on the Ringleman Chart as published by the United States Bureau of Mines, except that smoke of a density designated as Number One shall be permitted for one four-minute period in each hour.
(b) Particulate matter of dust as measured at the point of emission by any generally accepted method shall not be emitted in excess of 0.2 grains per cubic foot as corrected to a temperature of 500°F, except for a period of four minutes in any one-half hour, at which time it may equal, but not exceed 0.6 grains per cubic foot as corrected to a temperature of 500°F.
(c) Due to the fact that the possibilities of air contamination cannot reasonably be comprehensively covered in this section, there shall be applied the general rule that there shall not be discharged from any sources whatsoever such quantity as to cause injury, detriment, nuisance or annoyance to any considerable number of persons or to the public in general, or to cause or have a natural tendency to cause injury or damage to business, vegetation, or property.
(6) Odor. The emissions of odors that are generally agreed to be obnoxious to any considerable number of persons shall be prohibited.
(7) Gases. The gases sulphur dioxide, hydrogen sulphide, and carbon monoxide shall not exceed five parts per million. All nitrous fumes shall not exceed one part per million. Measurements shall be taken at the property line of the particular establishment involved.
(Ord. 905, passed 1-20-2015)