§ 12.26. Noise.

1.

No operation or activity shall be carried out in any district which causes or creates measurable noise levels exceeding the maximum sound pressure levels prescribed below, as measured on or beyond the boundary lines of the parcel on which the use is situated.

MAXIMUM PERMITTED SOUND PRESSURE LEVELS IN DECIBELS

Octave Band (Cycles per Second) (H2)	PR-1
	Day	Night
00 to 74	76	70
75 to 149	70	62
150 to 299	64	56
300 to 599	57	49
600 to 1,199	51	44
1,200 to 2,399	45	39
2,400 to 4,799	38	33
4,800 and above	36	31

 

MAXIMUM PERMITTED SOUND PRESSURE LEVELS IN DECIBELS
(POST 1960 PREFERRED FREQUENCIES)

Center Frequency (Cycles per Second) (H2)	PR-1
	Day	Night
31.5	77	72
63	73	68
125	67	62
250	62	57
500	55	50
1,000	51	46
2,000	44	39
4,000	37	32
8,000	33	28

 

2.

Sounds of very short duration, which cannot be measured accurately with the sound level meter, shall be measured by an impact noise analyzer; and the measurements so obtained may be permitted to exceed the maximum levels provided in the tables shown by no more than ten decibels. For purposes of this Ordinance, impact noises shall be considered to be noises generated by sources that do not operate more than one minute in any one-hour period.

3.

Where street traffic noises directly adjacent to the boundary line exceed these maximum permitted levels, the intensity levels permitted may then exceed those levels specified in the tables but may not exceed the level of the subject adjacent street traffic noise.

4.

Sounds of an intermittent nature, or characterized by high frequencies, which the building official deems to be objectionable to adjacent land uses, shall be controlled so as not to generate a nuisance to adjacent land uses, even if the decibel measurement does not exceed that specified in those tables.

5.

Noise resulting from temporary construction activity that occurs between 7:00 a.m. and 7:00 p.m. shall be exempt from the requirements of this section.