9-1-5-7: PERFORMANCE STANDARDS:
   A.   General Standards: All districts are governed by the following performance standards:
      1.   Measurement Methods:
         a.   For Smoke: For the purpose of grading the density of emission of smoke, the Ringelmann chart, published and used by the United States bureau of mines, shall be used. For determining smoke units, the Ringelmann density reading shall be made every minute during the period of observation. Each reading shall be multiplied by the time in minutes it is observed, and the products added together to determine the total number of smoke units observed during the total period of observation.
         b.   For Particular Matter: To determine the total net rate of emission of particular matter within the boundaries of any lot: Find the maximum emission in pounds per hour from each source of emission and divide by the number of acres of lot area, thereby obtaining the hourly rate of emission in pounds per acre. Add together the individual rates of emission found above to determine the total rate of emission from all sources within the boundaries of the lot.
         c.   For Noise: Sound levels shall be measured with a sound level meter and associated octave band filter manufactured according to standards prescribed by the American Standards Association. Measurements shall be made using the flat network of the sound meter.
         d.   For Vibration: For the purpose of measuring vibrations, a three (3) component measuring system shall be used. A three (3) component measuring system denotes instrumentation which can measure earthborn vibrations in three (3) directions each of which occurs at right angles to the other two.
      2.   Radiation Hazards: All applicable regulations of the atomic energy commission and any instrumentality of the state of Illinois shall be complied with.
      3.   Particulate Matter Standards: The total emission of particulate matter shall not exceed the rate established below:
 
Height Of Emission
Pounds Per
Hour Per Acre
   0 - 99 feet
6.00
   100 - 199 feet
6.50
   200 - 299 feet
7.50
   Over 299 feet
10.00
 
      4.   Odors: No continuous, frequent or repetitive, or readily detectable emission of odors or odor causing substance which would be offensive beyond any property line of any industrial use will be permitted. The rules and regulations of the Illinois air pollution control board shall be complied with.
      5.   Toxic Or Noxious Matter: No use on any property shall discharge across the boundaries of said property toxic or noxious matter in such concentrations as to be detrimental to or endanger the public health, safety, comfort or welfare, or cause injury or damage to other property or business.
      6.   Glare Or Heat: Any operation producing intense glare or heat shall be performed within a completely enclosed building and effectively screened in such a manner as not to create a public nuisance or hazard along property boundaries.
      7.   Noise: Impulsive type noises shall be subject to the performance standards hereinafter prescribed; provided, that such noises shall be capable of being accurately measured with equipment. Noises capable of being so measured for the purpose of this section, shall be those noises which cause rapid fluctuations of the needle of the sound level meter with a variation of no more than plus or minus two (±2) decibels. Noises incapable of being so measured, such as those of an irregular or intermittent nature, shall be controlled so as not to become a nuisance to adjacent uses.
At no point on the boundary of a residential district or a business district or at one hundred twenty five feet (125') from the nearest property line of a plant or operation, whichever distance is greater, shall the sound pressure level of an individual operation or plant (other than the operation of motor vehicles and other transportation facilities) exceed the decibel levels at the designated octave bands shown hereafter for the districts indicated.
   M-1 MANUFACTURING
 
OCTAVE BAND
CYCLE
PER SECOND
MAXIMUM PERMITTED
SOUND LEVEL IN
DECIBELS ALONG
RESIDENTIAL DISTRICT
BOUNDARIES OR 125
FEET FROM PLANT OR
OPERATION PROPERTY
MAXIMUM PERMITTED
SOUND LEVEL IN
DECIBELS ALONG
BUSINESS DISTRICT
BOUNDARIES OR 125
FEET FROM PLANT OR
OPERATION PROPERTY
0 - 74
67
73
75 - 149
62
68
150 - 299
58
64
300 - 599
54
60
600 - 1199
49
55
1200 - 2399
45
51
2400 - 4800
41
47
ABOVE 4800
37
43
 
   M-2 MANUFACTURING
The following restrictions shall not apply to noises not directly under the control of the property user; noises resulting from the construction and maintenance of buildings and facilities including site preparation, noises of safety or warning signals and noises of railroad or trucking equipment.
   MAXIMUM PERMITTED SOUND LEVEL
 
OCTAVE BAND
CYCLE
PER SECOND
IN DECIBELS
ALONG DISTRICT BOUNDARIES
OR 125 FEET FROM
PLANT OR OPERATION PROPERTY
0 - 74
81
75 - 149
75
150 - 299
67
300 - 599
60
600 - 1199
55
1200 - 2399
51
2400 - 4800
47
ABOVE 4800
43
 
      8.   Fire and Explosive Hazards: Activities involving the storage or manufacture of materials or products which decompose by detonation are not permitted.
The storage, utilization or manufacture of materials ranging from free or active burning to intense burning, as determined by the Zoning Board, is permitted under the following conditions.
         a.   The storage, utilization or manufacture of such materials or products which shall be within completely enclosed buildings or structures having incombustible exterior walls.
         b.   All such buildings or structures shall be set back at least forty feet (40') from property boundaries, or in lieu thereof, shall be protected throughout by an automatic sprinkler system complying with standards for installation prescribed by the National Fire Protection Agency.
The storage, utilization or manufacture of materials ranging from incombustible to moderate burning, as determined by the Zoning Board, is permitted.
Materials or products which produce flammable or explosive vapors or gases under ordinary weather temperatures, shall not be permitted in this district, with the exception of the following:
         a.   Materials required for emergency or standby equipment.
         b.   Materials used in secondary processes which are auxiliary to the principal operation.
      9.   Activities Must be Within Enclosed Buildings: All business, production, servicing, and processing shall take place within completely enclosed buildings unless otherwise specified.
   B.   Additional Standards for Residential, Business, and the M-1 Districts:
      1.   Storage: Within one hundred and fifty feet (150') of a residential or business district, all storage shall be in completely enclosed buildings or structures. Storage located elsewhere in this district may be open to the sky, but shall be enclosed by solid walls or fences ( including solid doors or gates thereto) at least eight feet (8') high, but in no case lower in height than the enclosed storage. The area surrounding the fenced storage area shall be suitably landscaped with grass and trees or shrubs to blend the area into the terrain of the land.
Open off-street loading facilities and open off-street parking of motor vehicles under one and one-half (11/2) tons' capacity may be unenclosed throughout the district, except for such screening of parking and loading facilities as may be required under the provisions of Section 9-1-5-5 and 9-1-5-6.
      2.   Smoke Emission: No stack shall emit more than ten (10) smoke units during any one hour. No smoke shall be emitted of a density in excess of Ringelmann No. 2. During a single one hour period in each twenty four (24) hour day each stack may emit up to twenty (20) smoke units when blowing soot or cleaning of fires at a density of Ringelmann no. 3, but not for longer than four (4) minutes each period.
No emission of smoke shall exceed a density of Ringelmann no. 3, except for a plume consisting entirely of condensed steam. For the purposes of grading the density of emission, the Ringelmann chart published and used by the United States bureau of mines shall be employed.
In addition to the performance standards specified herein, the emission of smoke or particulate matter in such manner or quantity as to be detrimental to or endanger public health, safety, comfort or welfare is hereby declared to be a public nuisance.
      3.   Particulate Matter Emission: The rate of emission of particulate matter from all sources within the boundaries of any lot shall not exceed a net figure of one pound per acre of lot area during any one hour, computed in accordance with the procedures set forth in subsection A1 of this section.
No emission of particulate matter shall exceed a density of Ringelmann no. 3, except for a plume consisting entirely of condensed steam. For the purposes of grading the density of emission, the Ringelmann chart published and used by the United States bureau of mines shall be employed.
Dust and other forms of air pollution borne by the wind from such sources of storage areas, yards, roads and so forth within lot boundaries shall be kept to a minimum by appropriate landscaping, paving, oiling, or other acceptable means. The emission of particulate matter from such sources shall conform with the requirements of the above paragraph.
In addition to the performance standards specified herein, the emission of smoke or particulate matter in such manner or quantity as to be detrimental to or endanger public health, safety, comfort or welfare is hereby declared to be a public nuisance.
      4.   Vibration: Any process or equipment which produces intense earthshaking vibrations, such as are created by heavy drop forges or heavy hydraulic surges, shall be set back at least five hundred feet (500') from the property boundaries on all sides, except for a property line adjoining an M-2 district, where such setback shall not be mandatory. However, in no case shall such vibration be allowed to create a public nuisance or hazard beyond the property boundaries.
      5.   Fire And Explosive Hazards In An Automobile Service Station: Flammable liquids and oils stored, sold and used in conjunction with the operation of an automobile service station and customarily required or used in such operation are permitted.
   C.   Additional Standards For The M-2 District:
      1.   Storage: Within one hundred fifty feet (150') of a residential or business district, all storage shall be in completely enclosed buildings or structures. Storage located elsewhere in this district may be open to the sky, but shall be enclosed by solid walls or fences (including solid doors or gates thereto) at least eight feet (8') high, but need not exceed twelve feet (12').
      2.   Smoke Emission: The emission of more than thirty seven (37) smoke units per stack in any one hour is prohibited, including smoke of a density greater than Ringelmann no. 2. However, once during each two (2) hour period each stack may be permitted up to fifty (50) additional smoke units (not to exceed Ringelmann no. 2) for soot blowing and for fire cleaning. Only during fire cleaning periods, however, shall smoke of a density of Ringelmann no. 3 be permitted, and then for not more than six (6) minutes per period.
      3.   Vibration: At no point on or beyond the boundary of any lot shall the ground transmitted steady state or impact vibration caused by any use or activity (except those not directly under the control of the property user) exceed the limits as established in the tables below. Discrete pulses which do not exceed one hundred (100) impulses per minute shall not cause displacement in excess of twice the values in the following tables:
   MAXIMUM PERMITTED STEADY STATE VIBRATION
   DISPLACEMENT IN INCHES
 
Cycles Per Second
Inches
Adjacent To Any
Residential Zone Inches
Less than 10
0.0039
0.0004
10 through 19
0.0022
0.0002
20 through 29
0.0011
0.0001
30 through 39
0.0007
0.0001
40 through 49
0.0005
0.0001
50 and over
0.0004
0.0001
 
   MAXIMUM PERMITTED IMPACT VIBRATION
   DISPLACEMENT IN INCHES
 
Cycles Per Second
Inches
Adjacent To Any
Residential Zone Inches
Less then 10
0.0195
0.0006
10 through 19
0.0110
0.0003
20 through 29
0.0055
0.0002
30 through 39
0.0035
0.0001
40 through 49
0.0025
0.0001
50 and over
0.0020
0.0001
 
(Ord. 89-54, 6-26-1989)