All uses established or placed into operation after the effective date of this chapter shall comply with the following performance standards. No use in existence on the effective date of this chapter shall be so altered or modified as to conflict with these standards. Performance standards as measured at the boundary lines of the Manufacturing District are maximums. Firms which exceed these standards are in violation of this chapter.
   (A)   Smoke.
      (1)   For the purpose of measuring the density of smoke, the Ringelmann Chart, published by the United States Bureau of Mines shall be used.
      (2)   The emission of smoke shall not exceed 20 smoke units and a smoke density greater than Ringelmann number two is prohibited except, as otherwise provided herein.
      (3)   For the purpose of fire cleaning and blowing of stacks, a smoke density not to exceed Ringelmann number three shall be permitted. Such emissions in excess of Ringelmann number two shall not exceed 30 minutes in any 24-hour period.
   (B)   Particulate matter.
      (1)   Dust and other types of air pollution borne by the wind from such sources as storage areas, yards and roads shall be kept to a minimum by the provision of landscaping, paving, oiling, fencing and other appropriate means.
      (2)   The emission from all sources within the lot area of particulate matter containing more than 10% by weight of particles with a diameter larger than 44 microns is prohibited.
   (C)   Noise.
      (1)   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 level meter.
      (2)   Impulsive type noises shall be subject to the performance standards hereinafter prescribed; provided that, such noises may be accurately measured with the equipment.
      (3)   For the purposes of this chapter, noises capable of being measured shall be those which cause rapid fluctuations of the needle of the sound level meter with a variation of no more than plus or minus two decibels. Noises incapable of being so measured such as those of an irregular and intermittent nature shall be controlled so as not to create a nuisance to adjacent uses.
      (4)   At the boundary of a residential or business district, the sound pressure level of any operation or plant (other than the operation of motor vehicles or other transportation facilities) shall not exceed the decibel limits in the octave bands designated as the following:
Octave Band (Frequency cycles per second)
Maximum Permitted Sound Level (Decibels)
Along Residential District Boundaries
Along Business District Boundaries
Octave Band (Frequency cycles per second)
Maximum Permitted Sound Level (Decibels)
Along Residential District Boundaries
Along Business District Boundaries
0 to 75
75 to 150
150 to 300
300 to 600
600 to 1,200
1,200 to 2,400
2,400 to 4,800
Above 4,800
   (D)   Fire and explosive hazards.
      (1)   The storage, utilization or manufacture of all products or materials shall conform to the standards prescribed by the National Fire Protection Association (a copy of which is on file in the office of the Zoning Administrator for the town, and which standards are hereby incorporated by reference and made a part hereof).
      (2)   Such storage, utilization or manufacturing shall not produce a hazard or endanger the public health, safety or welfare.
   (E)   Vibration.
      (1)   Vibrations shall be measured at any point along the district boundary line with a measuring instrument approved by the Plan Commission and shall be expressed as displacement in inches.
      (2)   No industrial operation or activity shall cause ground transmitted vibrations in excess of the following limits:
Frequency (Cycles per Second)
Maximum Permitted Displacement Along Manufacturing District Boundaries
0 to 10
10 to 20
20 to 30
30 to 40
40 and over
   (F)   Odor. The emission of odorous matter in a quantity which is readily detectable along the perimeter lot lines of the point of origination or which produces a public nuisance or hazard beyond said lot lines is prohibited.
   (G)   Toxic or noxious matter. No use shall discharge toxic or noxious matter of any sort in concentrations which may be detrimental to the public health safety, comfort or welfare or which may cause injury or damage to property or business.
   (H)   Glare or heat. Any operation producing intense glare or heat shall be performed completely within an enclosed building so it does not create a public nuisance or hazard along lot lines.
   (I)   Discharge of waste matter. No use shall accumulate within the lot or discharge beyond the lot lines any waste matter, whether liquid or solid, in violation of the applicable ordinances, standards and regulations of the town, the state’s Board of Health and the Stream Pollution Control Board of the state; or in such a manner as to endanger the public health, safety or welfare; or cause injury to property. Prior to improvement location permit issuance for any industrial use.
      (1)   Plans and specifications for proposed sewage disposal facilities therefor (unless a connection is being made to a public sewer), and industrial waste treatment and disposal facilities, shall be submitted to and written approval obtained from the Stream Pollution Control Board of the state.
      (2)   Written approval of proposed connection to a public sewer shall be obtained from the Zoning Administrator of the town.
      (3)   Plans and specifications for proposed storm drainage facilities shall be submitted to and written approval obtained from the Zoning Administrator of the town.
(2004 Code, § 6-503)