TABLE I
| ||
---|---|---|
Frequency Ranges
Containing
Standard Octave Bands
in Cycles per Second
|
Octave Band
Sound-Pressure
Level in Decibels
re 0.0002 dyne/cm
| |
20 to 75
|
67
| |
75 to 150
|
66
| |
150 to 300
|
61
| |
300 to 600
|
54
| |
600 to 1,200
|
47
| |
1,200 to 2,400
|
39
| |
2,400 to 4,800
|
29
| |
4,800 to 10,000
|
20
|
TABLE II
| ||
---|---|---|
Type of Operation or Character of Noise
|
Correction in Decibels
| |
Daytime operation only
|
+5
| |
Noise source operates less than 20% of any one-hour
period
|
+5*
| |
Noise source operates less than 5% of any one-hour
period
|
+10*
| |
Noise of impulsive or periodic character (hammering,
etc.)
|
-5
| |
NOTES:
*Apply one of these corrections only.
|