Table I
| ||
---|---|---|
Fluency Ranges Containing Standard Octave
Bands in Cycles Per Second
|
Octave Band Sound Pressure Level in Decibels
re 0.0002 dyne/cm
| |
20 to 75
|
65
| |
75 to 150
|
55
| |
150 to 300
|
50
| |
300 to 600
|
45
| |
600 to 1,200
|
40
| |
1,200 to 2,400
|
40
| |
35
|
Table II
| |||
---|---|---|---|
Type or Location of Operation or Character
of Noise
|
Correction
(decibels)
| ||
Daytime operation only
|
+5
| ||
Noise source operated less than*
| |||
20% of any 1-hour period
|
+5
| ||
5% of any 1-hour period
|
+10
| ||
Noise of impulsive character (hammering, etc.)
|
-5
| ||
Noise of periodic character (hum, screech, etc.)
|
-5
|
*Note: Apply one of these corrections only.
|