The maximum decibel level radiated by any use or facility at
any lot lines shall not exceed the values in the designated octave
bands given in Table 50-1. The sound-pressure level shall be measured
with a second-level meter and associated octave-band analyzer conforming
to standards prescribed by the American Standards Association. (American
Standard Sound-Level Meters for Measurement of Noise and Other Sound,
Z24.3-1944, American Standards Association, Inc., New York, and American
Standard Specifications for an Octave-Bank Filter Set for the Analysis
of Noise and Other Sound, Z24.10-1953, American Standards Association,
Inc., New York, New York, shall be used.)
Where any use adjoins a residential or mixed use district at
any point at the district boundary, the maximum permitted decibel
levels in all octave bands shall be reduced by six decibels from the
maximum levels set forth in Table 50-1.
|
Table 50-1
| |
|---|---|
|
Sound Levels
| |
|
Frequency Band
(cycles per second)
|
Maximum Permitted Sound-Pressure Level
(decibels)
|
|
0 to 75
|
69
|
|
75 to 150
|
60
|
|
150 to 300
|
56
|
|
300 to 600
|
51
|
|
600 to 1,200
|
42
|
|
1,200 to 2,400
|
40
|
|
2,400 to 4,800
|
38
|
|
4,800 to 10,000
|
35
|
