632.10 MAXIMUM SOUND PRESSURE LEVELS.

   (a)   In Industrial Zoning Districts, at no point on the boundary of a Residence Zoning District shall the sound pressure level of any individual operation or plant, or the combined operations of any person, exceed the decibel levels in the designated octave bands as shown below for the zoning districts indicated as measured under the test procedures established by Section 632.13.

      Octave Band                  Maximum Sound Pressure Levels
       Center                  (dB) Along District Boundaries
       Frequency
        (Hz)                   Residence Daytime

      31.5                        77

      63                        76

      125                        70

      250                        62

      500                        56

      1,000                        50

      2,000                        44

      4,000                        39

      8,000                        37

      A-scale levels (for monitoring purposes)         60 dB(A)

      31.5                        67

      63                        66

      125                        60

      250                        52

      500                        46

      1,000                        40

      2,000                        34

      4,000                        29

      8,000                        27

      A-scale levels (for monitoring purposes)         50 dB(A)

   (b)   In Residence Zoning Districts, any property use shall conform to the performance standards stated above for Residence District boundaries, provided that the performance standards shall in every case be applied at the boundaries of the lot on which such use is established.

   (c)   The maximum sound pressure levels established in this section to be applied to the boundaries of a lot shall not apply to construction sites. Construction site noise level shall be regulated by Sections 632.05 and 632.07(a).