1.   General Description. This industrial district has been designated to provide areas for development by industrial firms that have high standards of performance and that can be located in close proximity to residential and commercial uses. These district regulations are designed to permit the operations of most manufacturing, wholesaling, and warehousing activities with adequate protection to adjacent district uses and sufficient control of external effects to protect one industry from another. Some retail uses are permitted that service the industrial uses within the industrial area or that do not depend upon the direct visits of retail customers. No outdoor storage is allowed in this district and all industrial operations must be in an enclosed building, unless otherwise provided for herein.

2.   Principal Uses Permitted. Property and buildings in a Light Industrial District (I-1) will be used only for the following purposes:

   A.   Any use or structure permitted in the Highway-Oriented Commercial Service District (C-3).

   B.   Contractor’s storage yard when properly screened to obstruct the view.

   C.   Lumber processing yard, including millworks and saw mills, when properly screened to obstruct the view.

   D.   Automobile repair garage with special conditions.

   E.   The manufacture, compounding, processing, packaging, or treatment of such products as bakery goods, candy, cosmetics, pharmaceutical, toiletries, and food products.

   F.   The manufacture, compounding, assembling or treatment of articles or merchandise from the following previously prepared material: canvas, cellophane, cloth, fiber, glass, leather, paper, plastics, precious or semi-precious metals or stone, rubber, textiles, wood, and yarn.

   G.   Assembly firm, without fabrication, of completely fabricated parts.

   H.   Firms involved in the servicing, packaging or storage of commodities produced in the I-1 district.

   I.   Laboratory and research firm involved in the research, experimentation, or testing of materials, goods, or products.

   J.   The manufacture or assembly of electrical appliances including, but not limited to, refrigerators and stoves; electronic instruments and devices including, but not limited to, phonographs, radio, and television sets; and electric and neon signs.

   K.   Planned Development District.

   L.   Accessory uses, buildings or other structures, and devices customarily incidental to and commonly associated with a permitted use or special use may be permitted, provided they are operated and maintained under the same ownership on the same parcel, and do not include structures or features inconsistent with the permitted use or special use.

   M.   Warehousing or mini-warehousing uses.

3.   Special Exceptions. The following principal uses may be permitted as special exceptions by the Board of Adjustment in accordance with the provisions contained herein:

   A.   Outdoor storage facilities.

   B.   Any other use that is determined by the Board of Adjustment upon review to be of the same general character as the foregoing permitted uses, but not including any use which may become noxious or offensive in an I-1 district. In determining the character or nature of such use, the Board of Adjustment will refer to Section 170.25(7)(D).

4.   Prohibited Uses. The following uses are specifically prohibited in the Light Industrial District (I-1):

   A.   Dwellings, except for watchman or caretaker on the premises.

   B.   Churches or temples, schools, hospitals, clinics, and other institutions for human care, except when incidental to a permitted use.

   C.   Auto salvage and wrecking operations, industrial metal and waste salvage operations, and junk yards.

   D.   Manufacture and storage of ammunition, dynamite, and other high explosives.

5.   Height Regulations. No building or structure will exceed 100 feet in height and no accessory structure will exceed 40 feet in height.

6.   Lot Area, Lot Width, and Yard Requirements.

   A.   Lot Area. None required. The minimum lot width, setbacks, on-site parking requirements, floor area ratios, building codes, maximum lot coverage, etc., will ultimately determine minimum lot areas.

   B.   Lot Width and Yard Requirements. The following minimum lot and yard width requirements will apply:

      (1)   Lot Width.   150 feet.

      (2)   Front Yard Depth.   50 feet.

      (3)   Side Yard Width and Rear Yard Depth:   Side and rear yards will be governed by the requirement that buildings will adjoin public space, yards, or streets on three sides and that each such space will be not less than 20 feet.

7.   Special Provisions.

   A.   Enclosure of Operations. All industrial operations, including off-street loading space, (and solid waste collection and storage), or processing will take place within completely enclosed buildings or structures.

   B.   Screening. Where an office, commercial, or industrial use abuts or is across the street from a residential district, adequate screening and landscaping will be provided in accordance with Section 170.43.

   C.   Parking Provisions. Parking spaces/areas will be provided, in accordance with the applicable regulations set forth in Section 170.52.

   D.   Performance Standards. Any use established in this district after the effective date of this Zoning Code will be so operated as to comply with the performance standards governing Subparagraphs (1) - (8). Where the performance standards required by this Code are less restrictive than comparable requirements imposed by any other law, ordinance, resolution, rule, or regulation of any kind of the State of Iowa or another governmental agency, the more restrictive will govern. Uses already established on the effective date of this Code will be permitted to be altered, enlarged, expanded, or modified provided that the additions or changes comply with said performance standards.

      (1)   Noise. For the purpose of measuring the intensity and frequency of sound, the sound level meter, the octave band analyzer, and the impact noise analyzer will be employed. The flat network and the fast meter response of the sound level meter will be used. Sounds of very short duration, as forge hammers, punch presses, and metal shears which cannot be measured accurately with the sound level meter will be measured with the impact noise analyzer. Octave band analyzers calibrated in the preferred frequencies (United States of America Standard S16-1967, Preferred Frequencies for Acoustical Measurements) will be used in the table herein “Octave Band, Preferred Frequencies.” Octave band analyzers calibrated with the pre-1960 octave bands (U.S.A.S. Z24. 10-1953, Octave Band Filter Set) will be used with the tables herein “Octave Band, Pre-1960”. The following uses and activities will be exempt from the noise level regulations:

         a.   Noises not directly under the control of the property user.

         b.   Noises emanating from construction and maintenance activities between 7:30 a.m. and 7:00 p.m. on weekdays and 8:30 a.m. to 5:00 p.m. on Saturdays. Such activities are those which are non-routine operations accessory to the primary activities and which are temporary in nature or conducted infrequently.

         c.   The noises of safety signals, warning devices, and emergency pressure relief valves which are used infrequently.

         d.   Transient noises of moving sources such as automobiles, trucks, airplanes, and railroads. The decibel values specified for residentially zoned districts will be reduced by five decibels between the hours of 7:00 p.m. and 7:30 a.m. Noises from essential services are excluded from this nighttime reduction. The generation of noise will not exceed the decibel limits prescribed below.

 

 

      (2)   Vibration. No activity or operation will cause or create earth borne vibrations in excess of the displacement values given below. Measurements will be made at or beyond the adjacent lot line or nearest residentially-zoned district boundary line, as described below. Vibration displacements will be measured with an instrument or complement of instruments capable of simultaneously measuring in three mutually perpendicular directions. The maximum vector will be less than the vibrations displacement permitted. The maximum permitted displacements will be permitted in each district by the following formula:

       K
D = f

Where: D = Displacement in inches

K = A constant to be determined by reference to the following tables

f = The frequency of the vibration transmitted through the ground, cycles per second.

The maximum earth displacement permitted at the points described below will be determined by use of the formula in the preceding paragraph and the appropriate K constant shown as follows:

 

      (3)   Smoke and Particulate Matter. The standards and controls of the Quad City Regional Air Pollution Control Board with reference to smoke and particulate matter will be the controlling regulation in the City. However, in the absence of such control, the following will be the controlling standard: For the purpose of grading the density or equivalent opacity of smoke, the Ringelmann Chart described in the U.S. Bureau of Mines Information Circular 8333 (May 1967) will be employed. The emission of smoke or particulate matter of a density or equivalent opacity equal to or greater than No. 2 on the Ringelmann Chart is prohibited at all times except as otherwise provided hereinafter. Dust and other types of air pollution borne by the wind from such sources as storage areas, yards, roads, and the like within lot boundaries will be kept to a minimum by appropriate landscaping, paving, oiling, fencing, wetting or other acceptable means. No operation will cause or allow to be emitted into the open air from any process or control equipment or to pass any convenient measuring point in a breaching or stack, particulate matter in the gases that exceeds 0.35 grains per standard cubic foot (70 degrees Fahrenheit and 14.7 psi) of gases during any one hour. Particulate matter loading in pounds per acre described below will be determined by selecting a continuous four-hour period which will result in the highest average emission rate. The emission of smoke having a density or equivalent opacity in excess of Ringelmann No. 1 is prohibited. However, for two minutes in any four-hour period, smoke up to and including Ringelmann No. 2 will be permitted. The rate of emission of particulate matter from all vents and stacks within the boundaries of any lot will not exceed 0.5 pounds per hour per acre of lot area.

      (4)   Toxic matter. The release of airborne toxic matter will not exceed one-eighth of the “Threshold Limit Values for 1967” as adopted by the American Conference of Governmental Industrial Hygienists, when measured at any point beyond the lot line, either at ground level or habitable elevation, whichever is more restrictive. Concentrations will be measured and calculated as the highest average that will occur over a continuous 24-hour period. If a toxic substance is not listed, the applicant will satisfy the City that the proposed level will be safe and not detrimental to the public health or injurious to plant and animal life.

      (5)   Odorous matter. When odorous matter is released from any operation, activity, or use, the concentration of such odorous materials will not exceed the odor threshold when measured beyond the lot line, either at ground level or habitable elevation.

      (6)   Fire and explosion hazards.

         a.   Detonable Materials. The storage, utilization, or manufacture of materials or products which decompose by detonation is limited to five pounds. Such materials will include, but are not limited to: all primary explosives such as lead azide, lead styphnate, fulminates, and tetracene; all high explosives such as TNT, RDX, HMX, PETN, and picric acid; propellants and components thereof, such as dry nitrocellulose, black powder, boron hydrides, hydrazine and its derivatives; pyrotechnics and fireworks such as magnesium powder, potassium chlorate, and potassium nitrate; blasting explosives such as dynamite and nitroglycerine; unstable organic compounds such as acetylides, tetrazoles, and ozonides; unstable oxidizing agents such as perchloric acid, perchlorates, and hydrogen peroxide in concentrations greater than 35 percent.

         b.   Flammable Solids. The storage, utilization, or manufacture of solid materials or products ranging from incombustible to moderate burning is permitted. The storage, utilization, or manufacture of solid materials or products ranging from free or active burning to intensive burning is permitted provided said materials or products will be stored, utilized, or manufactured within completely enclosed buildings having not less than two-hour fire-resistant exterior walls and protected with an automatic fire extinguishing system.

         c.   Flammable Liquids and Gases. The storage, utilization, or manufacture of flammable liquids will be permitted in accordance with the following table, exclusive of storage of finished products in original sealed containers, which will be unrestricted. Aboveground flammable liquids and gas storage tanks will not be less than 50 feet from all lot lines. Flammable liquids and gases in original sealed containers of 55-gallons liquid capacity or less may be stored or utilized without restriction.

 

 

When flammable gases are stored, utilized, or manufactured and measured in cubic feet, the quantity in cubic feet at standard temperature and pressure will not exceed 30 times the quantities listed above.

      (7)   Glare. Any operation or activity, (including lighted signage), producing glare will be conducted so that direct, indirect, and reflected illumination from any source of light on any lot will not cause illumination in excess of one-half foot candle when measured at any point on any adjoining property. No fluctuating, revolving, flickering, flashing, or other such non-constant sources of lighting will be allowed.

      (8)   Radiation hazards. The release of radioactive materials or the emission of ionizing radiation outside of property lines will be in accordance with the rules and regulations of the State or the Nuclear Regulatory Commission. Unsealed radioactive materials will not be manufactured, utilized, or stored except when such materials are stored in a radioactive-proof container stored at or below ground level.

   E.   Sign Requirements. Any sign erected will be done so in accordance with the applicable regulations set forth in Section 170.53.

   F.   Outdoor Sales. All outdoor sales space will be provided with a permanent, durable, and dustless surface and will be graded and drained as to properly dispose of all surface water.

   G.   Outdoor Storage. When permitted, all outdoor storage facilities for fuel, raw materials, products, and all objectionable materials will be enclosed by a fence, wall, or plant materials adequate to completely conceal such facilities from any adjacent properties and any public right-of-way.

   H.   Waste Materials. No materials or waste will be deposited upon a lot in such a form that may be transferred off the property by natural causes or forces.

8.   Floor Area Ratio. The allowable floor area ratio in this zoning district will not exceed 0.6.

9.   Maximum Lot Coverage. Not more than 40 percent of the lot area may be occupied by buildings and structures, including accessory buildings.