§ 22.197 NOISE.

   (A)   Maximum sound levels. No operation or activity shall cause or create noise above the sound pressure levels in Tables 22 and 23 at the locations specified therein.

   (B)   Measurement. A sound-level meter and associated octave band analyzer shall be employed to measure the intensity and frequency of sound. The flat network slow meter response of the sound level meter shall be used.

   (C)   Exemptions. The following shall be exempt from noise performance standards:

      (1)   Noises of construction or maintenance activities from 7:00 a.m. to 7:00 p.m.;

      (2)   Noises of safety signals, warning devices, and emergency relief valves;

      (3)   Transient noises of moving sources such as transportation vehicles;

      (4)   Noises associated with snow plowing, street sweeping, and mosquito abatement;

      (5)   Church bells, chimes, and carillons; and

      (6)   Other noises not under the direct control of the property user.

(Ord. 480B, passed 8-21-1953; Ord. 90-O-036, passed 11-8-1990; Ord. 14-O-36, passed 11-14-2014)

Table 22: Permitted Sound Levels
Preferred Center Frequency in Hertz	Maximum Permitted Sound Pressure Level in Decibels at Boundaries of Nearest Residentially Zoned Lot
31.5	75
63	74
125	69
250	64
500	58
1,000	52
2,000	47
4,000	43
8,000	40
Above figures for octave band analyzers calibrated with preferred frequencies (American Standards Association S1.6-1960, preferred frequencies for acoustical measurement) Sound levels above shall be modified where applicable by the adjustments in Table 23

 

(Ord. 480B, passed 8-21-1953; Ord. 90-O-036, passed 11-8-1990; Ord. 14-O-36, passed 11-14-2014)

Table 23: Adjustments to Permitted Sound Levels
	Adjustment in Decibels
Duration of noise in any one-hour period (use one adjustment only):
Under 12 minutes	Add 5 dB
Under 3 minutes	Add 10dB
Under ½ minute	Add 15dB
At boundaries of nearest office or commercial zoned lot	Add 5dB
Noise is impulsive in character (such as, hammering)	Subtract 5dB
Noise is periodic in character (such as, hum, screech)	Subtract 5dB
Noise may be heard between hours of 7:00 p.m. and 7:00 a.m.	Subtract 5dB

 

(Ord. 480B, passed 8-21-1953; Ord. 90-O-036, passed 11-8-1990; Ord. 14-O-36, passed 11-14-2014)