1. Maximum Permissible Sound Levels. It is a violation of this chapter for any person to operate or permit to be operated any stationary source of sound in such a manner as to create a ninetieth percentile sound pressure level (L
90
) of any measurement period (which shall not be less than 10 minutes unless otherwise provided in this chapter) which exceeds the limits set forth for the following receiving land use districts when measured at the boundary or at any point within the property affected by the noise:
Use District | 8:00 p.m. to 7:00 a.m. | 7:00 a.m. to 8:00 p.m. |
Residential | 45 dB(A) | 55 dB(A) |
Commercial-Agricultural | 55 dB(A) | 60 dB(A) |
Industrial | 75 dB(A) | 80 dB(A) |
2. When a noise source can be identified and its noise measured in more than one land use category, the limits of the most restrictive use shall apply at the boundaries between different land use categories.
3. Correction for Duration of Sound.
A. It is a violation of this chapter for any person to operate, or permit to be operated, any stationary source of sound within any land use district which creates a tenth percentile sound pressure level (L
10
) of 15 dB(A) greater than levels set forth for the receiving land use districts in subsection 1 of this section for any measurement period. Such period shall not be less than 10 minutes.
B. Notwithstanding subsection A of this subsection, no person shall operate or permit to be operated any stationary source of sound within any land use district which created a tenth percentile sound pressure level (L
10
) greater than 15 dB(A) above the ambient sound pressure level (L
90
) of any measurement period. Such measurement period shall not be less than 10 minutes.
4. Correction for Character of Sound.
A. For any stationary source of sound which emits a pure tone, cyclically varying sound or repetitive impulsive sound, the limits set forth in subsection 1 of this section shall be reduced to 5 dB(A).
B. Notwithstanding compliance with subsection A of this subsection, it is a violation of this chapter for any person to operate or permit to be operated any stationary source of sound which emits a pure tone, cyclically varying or repetitive impulsive sound which creates a noise disturbance.