a. It shall be a violation of these rules and regulations for any person to operate or permit the operation of any stationary source of sound creating a ninetieth percentile sound pressure level (L90) for any measurement period (not less than 10 minutes unless otherwise provided in these regulations) that exceeds the limits set forth for the following zones when measured at the boundary or at any point within the property affected by the noise:

b. 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. (9.1)

a. It shall be a violation of these rules and regulations for any person to operate or permit the operation of any stationary source of sound within any zones that creates a tenth percentile sound pressure level (LlO) of 15 dB(A) greater than the levels set forth for the receiving zones in Section 24-22-109(1) for any measurement period. Such period shall not be less than 10 minutes.

b. Notwithstanding the requirements of Section 24-22-109(2)(a), it shall be a violation of these rules and regulations for any person to operate or permit the operation of any stationary source of sound within any land use district that creates a tenth percentile sound pressure level (LlO) greater than 15 dB(A) above the ambient sound pressure level (L90) of any measurement period. Such period shall not be less than 10 minutes. (9.2)

a. For any stationary source of sound that emits a pure tone, cyclically varying sound, or repetitive impulsive sound, the limits set forth in Section 9.1 shall be reduced by five dB(A).

b. Notwithstanding compliance with Section 24-22-109(3)(a), it shall be a violation of these rules and regulations for any person to operate or permit the operation of any stationary source of sound that emits a pure tone, cyclically varying sound, or repetitive impulsive sound that creates a noise disturbance. (9.3)