A. The maximum sound pressure level radiated by any use or facility in an M-P zone, when measured at the boundary line of the property on which sound is generated, shall not exceed the values shown in the following table:
Octave Band Range In Cycles Per Second
| Sound Pressure Level In Decibels 0.0002 dyne/cm2 |
Octave Band Range In Cycles Per Second
| Sound Pressure Level In Decibels 0.0002 dyne/cm2 |
Below 75 | 72 |
75–150 | 67 |
151–300 | 59 |
301–600 | 52 |
601–1,200 | 46 |
1,201–2,400 | 40 |
2,401–4,800 | 34 |
Above 4,800 | 32 |
B. If the noise is not smooth and continuous, or is not present between the hours of ten o'clock (10:00) P.M. and seven o'clock (7:00) A.M., one or more of the following corrections shall be applied to the above octave band levels:
Correction In Decibels | |
Daytime operation only | +5 |
Noise source operates less than 20 percent of any 1 hour period | +5 |
Noise source operates less than 5 percent of any 1 hour period | +10 |
Noise of impulsive character, such as hammering | -5 |
Noise of periodic character, such as humming or screeching | -5 |
C. The sound pressure level shall be measured with a sound level meter and associated octave band analyzer conforming to standards prescribed by the American Standards Association, as set forth in a pamphlet published by the association entitled, "American Standard Sound Level Meters For Measurement Of Noise And Other Sounds No. 224.3", published in 1944 and in another pamphlet published by the same association, entitled, "American Standard Specification For An Octave-Band Filter Set For The Analysis Of Noise And Other Sounds No. 224.10", published in 1953. (Ord. 1000 § 27.54(C), 1955)