07 GENERAL AND SUPPLEMENTARY PROVISIONS
Table I. Sound Pressure Levels in Decibels | |
|---|---|
Octave Band (cycles per second) | Maximum Permitted Sound Pressure Level (decibels) |
20 – 75 | 75 |
75 – 150 | 70 |
150 – 300 | 64 |
300 – 600 | 59 |
600 – 1,200 | 53 |
1,200 – 2,400 | 47 |
2,400 – 4,800 | 40 |
4,800 – 10KC | 34 |
Table II. Correction in Maximum Permitted Sound Pressure Level in Decibels to Be Applied to Table I | |
|---|---|
Type of Operation or Character of Noise | Correction in Decibels |
Noise source operates less than twenty (20) percent of any one (1) hour period | Plus 5* |
Noise source operates less than five (5) percent of any one (1) hour period | Plus 10* |
Noise source operates less than one (1) percent of any one (1) hour period | Plus 15* |
Noise of impulsive character (hammering, etc.) | Minus 5 |
Noise of periodic character (hum, screech, etc.) | Minus 5 |
*Apply one (1) of these corrections only. |