[Ord. 5/26/1987, § 1600; as amended by Ord. No. 303, 3/26/2024]
The sound level of any operation (other than the operation of motor vehicles or other ground transportation facilities on public highways, operations involved in the construction or demolition of structures, emergency alarm signals or time signals) shall not exceed the decibel levels in the designated octave bands as stated below. The sound-pressure level shall be measured with a sound level meter and octave band analyzer that conform to specifications published by the American National Standards Institute. American National Standard Specification for Sound Level Meters, S1.4-1971, American National Standards Institute, Inc., New York, New York and the American Standard Specification for an Octave, Half Octave and Third Octave Band Filter Sets, S1.11-1966, R 1971, American National Standards Institute, Inc., New York, New York shall be used.
Sound-pressure levels shall be measured at the property line upon which the emission occurs. The maximum permissible sound-pressure levels for smooth and continuous noise shall be as follows. (All of the decibel levels stated below shall apply in each case.)
Frequency Band (Cycles per Second) | Maximum Permitted Sound-Pressure Level (Decibels) |
|---|---|
20-75 | 60 |
75-150 | 54 |
150-300 | 47 |
300-600 | 41 |
600-1200 | 37 |
1200-2400 | 34 |
2400-4800 | 31 |
Above 4800 | 28 |
If the noise is not smooth and continuous or is radiated during sleeping hours, one or more of the corrections below shall be added to or subtracted from each of the decibel levels given above. |
Type of Operation or Character of Noise | Corrections in Decibels |
|---|---|
Noise occurs between the hours 10:00 p.m. and 7:00 a.m. | -3 |
Noise occurs less than 5% of any one-hour period | +3 |
Noise is of periodic character (hum, scream, etc.) or is of impulsive character (hammering, etc.). (In the case of impulsive noise, the correction shall apply only to the average pressure during an impulse and impulse peaks shall not exceed the basic standards given above.) | -5 |