Supplementary Regulations
TABLE I | |
|---|---|
Maximum permissible sound-pressure levels at specified points of measurement for noise radiated continuously from a facility between the hours of 7:00 p.m. and 7:00 a.m. |
Frequency Ranges Containing Standard Octave Bands (cycles per second) | Octave Band Sound-Pressure Level (decibels) (re 0.0002 dyne/cm) | |||
|---|---|---|---|---|
20 | 75 | 67 | ||
75 | 150 | 66 | ||
150 | 300 | 61 | ||
300 | 600 | 54 | ||
600 | 1,200 | 47 | ||
1,200 | 2,400 | 39 | ||
2,400 | 4,800 | 29 | ||
4,800 | 10,000 | 20 | ||
TABLE II | ||
|---|---|---|
Type of Operation or Character of Noise | Correction (decibels) | |
Daytime operation only | Plus 5 | |
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 of impulsive character (hammering, etc.) | Minus 5 | |
Noise of periodic character (hum, screech, etc.) | Minus 5 | |
*NOTE: Apply one of these corrections only. |
Supplementary Regulations
TABLE I | |
|---|---|
Maximum permissible sound-pressure levels at specified points of measurement for noise radiated continuously from a facility between the hours of 7:00 p.m. and 7:00 a.m. |
Frequency Ranges Containing Standard Octave Bands (cycles per second) | Octave Band Sound-Pressure Level (decibels) (re 0.0002 dyne/cm) | |||
|---|---|---|---|---|
20 | 75 | 67 | ||
75 | 150 | 66 | ||
150 | 300 | 61 | ||
300 | 600 | 54 | ||
600 | 1,200 | 47 | ||
1,200 | 2,400 | 39 | ||
2,400 | 4,800 | 29 | ||
4,800 | 10,000 | 20 | ||
TABLE II | ||
|---|---|---|
Type of Operation or Character of Noise | Correction (decibels) | |
Daytime operation only | Plus 5 | |
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 of impulsive character (hammering, etc.) | Minus 5 | |
Noise of periodic character (hum, screech, etc.) | Minus 5 | |
*NOTE: Apply one of these corrections only. |