A. Compliance Required: Any use established in the M-1 Restricted Manufacturing District after the effective date hereof shall be so operated as to comply with the performance standards governing noise set forth hereinafter for the District. No use lawfully established on the effective date hereof shall be so altered or modified as to conflict with, or further conflict with, the performance standards governing noise established hereinafter.
B. Measurement of Sound: 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. Impulsive type noises shall be subject to the performance standards hereinafter prescribed, provided that such noises shall be capable of being accurately measured with such equipment. Noises capable of being so measured, for the purpose of this Title, 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 and intermittent nature, shall be controlled so as not to become a nuisance to adjacent uses.
C. Maximum Noise Levels: In the M-1 Restricted Manufacturing District, at no point on the boundary of a residence district or a business district shall the sound pressure level of any operation or plant (other then background noises produced by sources not under control of this Title, such as the operation of motor vehicles or other transportation facilities) exceed the decibel limits in the octave bands designated below.
Octave Band Frequency cycles per second)
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Maximum Permitted Sound Level (in decibels) Along Residence District Boundaries
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Octave Band Frequency cycles per second)
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Maximum Permitted Sound Level (in decibels) Along Residence District Boundaries
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0 to 75 | 72 |
75 to 150 | 67 |
150 to 300 | 59 |
300 to 600 | 52 |
600 to 1,200 | 46 |
1,200 to 2,400 | 40 |
2,400 to 4,800 | 34 |
Above 4,800 | 32 |
Octave Band Frequency (cycles per second)
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Maximum Permitted Sound Level (in decibels) Along Business District Boundaries
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Octave Band Frequency (cycles per second)
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Maximum Permitted Sound Level (in decibels) Along Business District Boundaries
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0 to 75 | 78 |
75 to 150 | 74 |
150 to 300 | 66 |
300 to 600 | 59 |
600 to 1,200 | 53 |
1,200 to 2,400 | 47 |
2,400 to 4,800 | 41 |
Above 4,800 | 39 |