(A) 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 chapter, 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 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.
(B) At no point on the boundary of a Residence or Business District shall the sound intensity level of any individual operation or plant (other than the operation of motor vehicles or other transportation facilities) exceed the decibel levels in the designated octave bands shown in the following table:
OCTAVE BAND | MAXIMUM PERMITTED SOUND LEVEL (DECIBELS) | |
Frequency Cycles Per Second | Along Residence District Boundaries | Along Business District Boundaries |
OCTAVE BAND | MAXIMUM PERMITTED SOUND LEVEL (DECIBELS) | |
Frequency Cycles Per Second | Along Residence District Boundaries | Along Business District Boundaries |
0 to 75 | 72 | 75 |
75 to 150 | 67 | 70 |
150 to 300 | 59 | 63 |
300 to 600 | 52 | 57 |
600 to 1,200 | 46 | 52 |
1,200 to 2,400 | 40 | 45 |
2,400 to 4,800 | 34 | 40 |
above 4,800 | 32 | 38 |
(Ord. 77-08, passed 6-28-77) Penalty, see § 157.999