The purpose of the I-L, light industrial district, is to provide a location for industries which do not by their nature create nuisances. The intent is to preserve this land for industry in a location beneficial to industries and to prohibit non-industrial uses. Because of the traffic generated and other potentially objectionable influences created in this district, a buffer or setback area between this district and any other zoning district except I-H is required.
(1977 Code, sec.12-94; 2004 Code, sec. 14.271)
(a) 
Any use constructed, established, altered, or enlarged in the I-L, light industrial district, after the effective date of this chapter shall be so operated as to comply with the following standards:
(1) 
No building shall be used for residential purposes, except that a watchman may reside on the premises.
(2) 
No retail sales or services shall be permitted except as incidental to or accessory to a permitted use.
(3) 
No operation or activity shall cause or create noise in excess of the sound levels prescribed below.
(b) 
In the I-L district, at no point on or beyond the boundary of any lot shall the sound pressure level resulting from any use, operation, or activity exceed the maximum permitted decibel levels for the designated octave bands as set forth in tables I and II below.
(1) 
Table I: Preferred frequencies.
TABLE I. PREFERRED FREQUENCIES
Center Frequency Cycles Per Second
Maximum Permitted Sound Pressure Level, Decibels
31.5
76
63
74
125
68
250
63
500
57
1,000
52
2,000
45
4,000
38
8,000
32
(2) 
Table II: PRE-1960 OCTAVE BANDS.
TABLE II. Pre-1960 octave bands.
Octave Band Cycles Per Second
Maximum Permitted Sound Pressure Level, Decibels
20-75
75
75-150
70
150-300
64
300-600
59
600-1,200
53
1,200-2,400
47
2,400-4,800
40
4,800-10 KC
34
(3) 
Method of measurement.
For the purpose of measuring the intensity and frequency of sound, the sound level meter, the octave band analyzer, and the impact noise analyzer shall be employed. The flat network and the fast meter response of the sound level meter shall be used. Sounds of short duration as from forge hammers, punch presses, and metal shears which cannot be measured accurately with the sound level meter shall be measured with the impact noise analyzer.
(A) 
Octave band analyzers calibrated in the preferred frequencies (American Standards Association S1.6-1960, Preferred Frequencies for Acoustical Measurements) shall be used with table I. Octave band analyzers calibrated with pre-1960 octave band (American Standards Association Z24.10-1964, Octave Band Filter Set) shall use table II.
(B) 
For impact sounds measured with the impact noise analyzer, the sound pressure levels set forth in tables I and II may be increased by six decibels in each octave band.
(4) 
Exemptions.
The following uses and activities shall be exempt from the noise level regulations:
(A) 
Noises not directly under control of the property user.
(B) 
Noises emanating from construction and maintenance activities between 7:00 a.m. and 9:00 p.m.
(C) 
The noises of safety signals, warning devices, and emergency pressure relief valves.
(D) 
Transient noises of moving sources, such as automobile, trucks, airplanes, and railroads.
(c) 
No toxic matter, noxious matter, smoke, gas, or odorous or particle matter shall be emitted that is detectable, beyond the lot lines of the lot on which the use is located.
(d) 
Earth-carried vibration shall be limited so that detection by seismograph at any property line of an industrial establishment shall not exceed a value measured and computed as follows:
(1) 
Method of measurement.
Measurement shall be made at the property line; vibrating displacements shall be measured with an instrument capable of measuring in three mutually perpendicular directions.
(2) 
Maximum permissible displacements.
The following formula shall be used in computing the maximum displacements permitted in the I-L district:
D  =  
K
F
Where:
D
=
Displacement in inches
K
=
.01
F
=
The frequency of the vibration transmitted through the ground in cycles per second.
(e) 
Exterior lighting fixtures, wherever necessary, shall be shaded to avoid casting direct light upon property located in any residential district.
(f) 
The manufacture of flammable materials which produce explosive vapors or gases is prohibited.
(g) 
No outside storage of equipment and/or material, except equipment in daily use, shall be permitted in such a location where it can be viewed from any public street.
(h) 
Any operation that produces intense glare or heat shall be performed within a completely enclosed building, and exposed sources of light shall be screened so as not to be detectable beyond the lot lines.
(1977 Code, sec. 12-95; 2004 Code, sec. 14.272)
Within the I-L, light industrial district, the following uses are permitted:
(1) 
Building material sales.
(2) 
Commercial radio and television transmitting antenna towers and electronic equipment requiring outdoor towers, including antenna towers for the dispatching of private messages subject to conformance of the airport zoning regulations.
(3) 
Compounding, processing and blending of chemical products, but not including any materials which decompose by detonation.
(4) 
General and administrative offices.
(5) 
Machine shops and metal products manufacture and tool die shops, provided they do not include any of the following equipment: automatic metal, turning or threading lathes, drop forges or riveting machines.
(6) 
Mail-order houses.
(7) 
Manufacturing and assembling (or any combination of such processes) of products from wood, cork, glass, leather, fur, plastic, felt, and other textiles, but not including as a principal operation the processing of any raw materials.
(8) 
Manufacturing and assembling of electrical and electronic products and equipment.
(9) 
Printing and binding plants.
(10) 
Research laboratories.
(11) 
Warehouse and storage facilities.
(12) 
Water filtration plants, pumping stations, reservoirs, and lift stations.
(13) 
Accessory uses incidental to and on the same zoning lot as a principal use.
(14) 
Contractor yards and offices.
(1977 Code, sec. 12-96; 2004 Code, sec. 14.273)
The city council may permit uses other than those listed above to be located in the I-L district, after public hearing and determination that any such use is similar to those listed above and is not listed in section 14.06.283.
(1977 Code, sec. 12-97; Ordinance 523, sec. 5, adopted 1/27/00; 2004 Code, sec. 14.274)
Minimum Lot Area
Minimum Lot Frontage
Maximum Percent Coverage
Maximum Height
Minimum Front Yard Setback
Minimum Side Yard Setback
Minimum Rear Yard Setback
None
None
40%
None
50'
50' (minimum of 2' setback for each 1' of height when adjacent to residential district)
50'
(a) 
There are no area requirements in an I-L district.
(b) 
There are no lot frontage requirements in an I-L district.
(c) 
Not more than forty percent (40%) of the lot area shall be covered with improvements. Paved areas are not considered improvements within the meaning of this section.
(d) 
There are no height requirements in an I-L district.
(e) 
No structure shall be erected, commenced or maintained which has a front yard of less than fifty (50) feet.
(f) 
When adjacent to a residential district, a side yard of fifty (50) feet or two (2) feet for each one (1) foot of height, whichever is greater, shall be provided, and a safety fence provided where equipment is placed or stored.
(g) 
When adjacent to a residential district, a rear yard of fifty (50) feet or two (2) feet for each one (1) foot of height, whichever is greater, shall be provided, as well as a safety fence where equipment is stored or placed.
(1977 Code, sec. 12-98; 2004 Code, sec. 14.275)