INDUSTRIAL DISTRICTS
Center Frequency Cycles Per Second
| Maximum Permitted Sound Pressure Level, Decibels
|
Center Frequency Cycles Per Second
| Maximum Permitted Sound Pressure Level, Decibels
|
31.5 | 79 |
63 | 74 |
125 | 69 |
250 | 64 |
500 | 58 |
1,000 | 52 |
2,000 | 47 |
4,000 | 43 |
8,000 | 40 |
Type of Operation or Character of Noise
| Corrections in Decibels
|
Noise source operates less than 20% of any one hour period | plus 5* |
Noise source operates less than 5% of any one hour period | plus 10* |
Noise source operates less than 1% of any one hour period | plus 15% |
Noise of impulsive character (hammering, etc.) | minus 5 |
Noise of periodic character (hum, screech, etc.) | minus 5 |
INDUSTRIAL DISTRICTS
Center Frequency Cycles Per Second
| Maximum Permitted Sound Pressure Level, Decibels
|
Center Frequency Cycles Per Second
| Maximum Permitted Sound Pressure Level, Decibels
|
31.5 | 79 |
63 | 74 |
125 | 69 |
250 | 64 |
500 | 58 |
1,000 | 52 |
2,000 | 47 |
4,000 | 43 |
8,000 | 40 |
Type of Operation or Character of Noise
| Corrections in Decibels
|
Noise source operates less than 20% of any one hour period | plus 5* |
Noise source operates less than 5% of any one hour period | plus 10* |
Noise source operates less than 1% of any one hour period | plus 15% |
Noise of impulsive character (hammering, etc.) | minus 5 |
Noise of periodic character (hum, screech, etc.) | minus 5 |