Performance Standards
Table III | |||
|---|---|---|---|
Octave Band Frequency (Hz) | |||
> | < | Residential District* (Decibels) | Nonresidential (Decibels) |
20 | 75 | 69 | 78 |
75 | 150 | 67 | 74 |
150 | 300 | 59 | 66 |
300 | 800 | 52 | 59 |
800 | 1,200 | 46 | 53 |
1,200 | 2,400 | 40 | 47 |
2,400 | 4,800 | 34 | 41 |
4,800 | — | 32 | 39 |
If the noise is not smooth and continuous and is not radiated between the hours of 10:00 p.m. and 7:00 a.m., or if such noise is not radiated on weekends or legal holidays, one or more corrections in Table IV shall be applied to the octave band levels given in Table III. | |
* | In all districts where residential development is allowed. |
Table IV | |||
|---|---|---|---|
Type or Location of Operations or Character of Noise | Correction in Decibels | ||
1. | Daytime operation only | 5 | |
2. | Noise source operates less than* | 5 | |
a. | 20% of any one-hour period | 5 | |
b. | 5% of any one-hour period | 10 | |
3. | Noise of impulsive character, hammering, etc. | -5 | |
4. | Noise of periodic character, hum, screech, etc. | -5 | |
5. | Property is located in an M District and is not within 500 feet measured horizontally or vertically of any R District | 10 | |
NOTES: | |
|---|---|
* | Apply one of these corrections only. |
Table V | |||
|---|---|---|---|
Frequency (Hz) | |||
> | < | Residential District Displacement (In Inches) | Nonresidential District Displacement (In Inches) |
0 | 10 | 0.0004 | 0.0020 |
10 | 20 | 0.0002 | 0.0010 |
20 | 30 | 0.0001 | 0.0006 |
30 | 40 | 0.0001 | 0.0004 |
40 | 50 | 0.0001 | 0.0003 |
50 | — | 0.0001 | 0.0002 |
Discrete pulses that do not exceed 100 impulses per minute may not produce more than twice the displacement specified in this table. |
Performance Standards
Table III | |||
|---|---|---|---|
Octave Band Frequency (Hz) | |||
> | < | Residential District* (Decibels) | Nonresidential (Decibels) |
20 | 75 | 69 | 78 |
75 | 150 | 67 | 74 |
150 | 300 | 59 | 66 |
300 | 800 | 52 | 59 |
800 | 1,200 | 46 | 53 |
1,200 | 2,400 | 40 | 47 |
2,400 | 4,800 | 34 | 41 |
4,800 | — | 32 | 39 |
If the noise is not smooth and continuous and is not radiated between the hours of 10:00 p.m. and 7:00 a.m., or if such noise is not radiated on weekends or legal holidays, one or more corrections in Table IV shall be applied to the octave band levels given in Table III. | |
* | In all districts where residential development is allowed. |
Table IV | |||
|---|---|---|---|
Type or Location of Operations or Character of Noise | Correction in Decibels | ||
1. | Daytime operation only | 5 | |
2. | Noise source operates less than* | 5 | |
a. | 20% of any one-hour period | 5 | |
b. | 5% of any one-hour period | 10 | |
3. | Noise of impulsive character, hammering, etc. | -5 | |
4. | Noise of periodic character, hum, screech, etc. | -5 | |
5. | Property is located in an M District and is not within 500 feet measured horizontally or vertically of any R District | 10 | |
NOTES: | |
|---|---|
* | Apply one of these corrections only. |
Table V | |||
|---|---|---|---|
Frequency (Hz) | |||
> | < | Residential District Displacement (In Inches) | Nonresidential District Displacement (In Inches) |
0 | 10 | 0.0004 | 0.0020 |
10 | 20 | 0.0002 | 0.0010 |
20 | 30 | 0.0001 | 0.0006 |
30 | 40 | 0.0001 | 0.0004 |
40 | 50 | 0.0001 | 0.0003 |
50 | — | 0.0001 | 0.0002 |
Discrete pulses that do not exceed 100 impulses per minute may not produce more than twice the displacement specified in this table. |