§ 155.394 PERFORMANCE STANDARDS; NOISE.

   (A)   For the purpose of measuring the intensity and frequency of sound, the sound level meter, the octave band analyzer and the impact noise analyzer shall be employed.

   (B)   The flat network and the fast meter response of the sound level meter shall be used. Sounds of very short duration, as from forge hammers, punch presses and metal shears which cannot be measured accurately with the sound level meter shall be measured with the impact noise analyzer.

   (C)   Octave band analyzers calibrated in the Preferred Frequencies (American Standards Association S1.6 - 1960, Preferred Frequencies for Acoustical Measurements) shall be used in the table headed “Octave Band, Preferred Frequencies.” Octave band analyzers calibrated with the pre-1960 octave bands (American Standards Association Z24.10 -1953, Octave Band Filter Set) shall be used with the tables headed “Octave Band, Pre-1960.”

   (D)   The following uses and activities shall be exempt from the noise level regulations:

      (1)   Noises not directly under the control of the property user;

      (2)   Noises emanating from construction and maintenance activities between 7:00 a.m. and 9:00 p.m.;

      (3)   The noises of safety signals, warning devices and emergency pressure relief valves; and

      (4)   Transient noises of moving sources such as automobiles, trucks, airplanes and railroads.

   (E)   The decibel values specified for residence districts shall be reduced by six decibels between the hours of 7:00 p.m. and 7:00 a.m.

   (F)   (1)   In the M1 District, the generation of noise shall not exceed the decibel limits prescribed below.

Maximum Permitted Sound Levels in Decibels (Re. 0002 Microbar)
Octave Band Pre-1960 (Cycles per Second)	Neighboring Lot	Residence District
20 - 75	79	72
75 - 150	74	67
150 - 300	66	59
300 - 600	59	52
600 - 1,200	53	46
1,200 - 2,400	47	40
2,400 - 4,800	41	34
above	39	32

 

Octave Band Preferred Frequencies (Cycles per Second)	Neighboring Lot	Residence District
31.5	83	76
63	78	71
125	72	65
250	64	57
500	57	50
1,000	51	50
2,000	46	39
4,000	41	34
8,000	38	32

 

      (2)   Impact noises measured on an impact noise analyzer shall not exceed the following peak intensities:

 

	Neighboring Lot	Residence District
Overall peak	86	80

 

   (G)   (1)   In the M2 District, the generation of noise shall not exceed the decibel limits prescribed below:

Maximum Permitted Sound Levels in Decibels (Re. 0002 Microbar)
Octave Band Pre-1960 (Cycles per Second)	Neighboring Lot	Residence District
20 - 75	82	72
75 - 150	77	67
150 - 300	69	59
300 - 600	62	52
600 - 1,200	56	46
1,200 - 2,400	50	40
2,400 - 4,800	44	34
4,800 - 10KC	42	32

 

Octave Band Preferred Frequencies (Cycles per Second)	Neighboring Lot	Residence District
31.5	86	76
63	81	71
125	75	65
250	67	57
500	60	50
1,000	54	45
2,000	49	39
4,000	44	34
8,000	41	32

 

      (2)   Impact noises measured on an impact noise analyzer shall not exceed the following peak intensities in decibels:

 

	Neighboring Lot	Residence District
Overall peak	90	80

 

(Ord. 1999-2, Zoning § 16, subs. .050, passed 2-15-1999)