I-C - INDUSTRIAL/COMMERCIAL DISTRICT
Table 27-12-I describes the maximum sound pressure level permitted from any industrial source and measured in any abutting zoning district. All industrial operations shall be limited by the standards listed below: |
Table 27-12-I | ||
|---|---|---|
Maximum Sound Pressure Levels in Decibels 0.002 Dynes Per Square Centimeter | ||
Octave Band in Cycles Per Second | 7:00 a.m. to 7:00 p.m. | 7:00 p.m. to 7:00 a.m. |
0 to 75 | 74 | 69 |
75 to 150 | 59 | 54 |
150 to 300 | 52 | 47 |
300 to 600 | 46 | 41 |
600 to 1,200 | 42 | 37 |
1,200 to 2,400 | 39 | 34 |
2,400 to 4,800 | 36 | 31 |
Above 4,800 | 33 | 28 |
For any noise of an impulsive or periodic character, the permissible limits for each octave band shall be reduced by five decibels. | ||
Sound levels shall be measured at the lot line with a sound level meter and associated octave band filter manufactured according to standards prescribed by the American Standards Association. | ||
P.V. = 6.28 F x D |
P.V. = Particle velocity (inches per second) |
F = Vibration frequency (cycles per second) |
D = Single amplitude displacement of the vibration (inches) |
Table 27-12-II designates the applicable columns of Table 27-12-III that apply on or beyond adjacent lot lines within the zone, and on or beyond appropriate district boundaries. Vibration shall not exceed the maximum permitted particle velocities in Table 27-12-III. Where more than one set of vibration levels apply, the most restrictive shall govern. Readings may be made at points of maximum vibration intensity. |
Table 27-12-II | ||
|---|---|---|
Abutting Zoning District | Adjacent Lot Line | |
I-C - Industrial/Commercial District | A | B |
The maximum peak particle velocities that correspond to the above designations are as follows: |
Table 27-12-III | ||
|---|---|---|
Maximum Peak Particle Velocity - in/sec | ||
VIBRATION | A | B |
Steady State | 0.02 | 0.10 |
Impact | 0.04 | 0.20 |
Table 27-12-IV | ||
|---|---|---|
Storage Capacity of Flammable Liquids and Gases | ||
Liquids | Gases | |
Above Ground Flash Point, F | Above Ground | |
Less than 70 | 70-200 | |
7,500 Gal. | 30,000 Gal. | 225,000 SCF* |
Below Ground Flash Point, F | Below Ground | |
15,000 Gal. | 60,000 Gal. | 450,000 SCF* |
Notes: | |
|---|---|
* | SCF-Standard Cubic Feet at 60 F. and 29.92 Inches Hi. |
I-C - INDUSTRIAL/COMMERCIAL DISTRICT
Table 27-12-I describes the maximum sound pressure level permitted from any industrial source and measured in any abutting zoning district. All industrial operations shall be limited by the standards listed below: |
Table 27-12-I | ||
|---|---|---|
Maximum Sound Pressure Levels in Decibels 0.002 Dynes Per Square Centimeter | ||
Octave Band in Cycles Per Second | 7:00 a.m. to 7:00 p.m. | 7:00 p.m. to 7:00 a.m. |
0 to 75 | 74 | 69 |
75 to 150 | 59 | 54 |
150 to 300 | 52 | 47 |
300 to 600 | 46 | 41 |
600 to 1,200 | 42 | 37 |
1,200 to 2,400 | 39 | 34 |
2,400 to 4,800 | 36 | 31 |
Above 4,800 | 33 | 28 |
For any noise of an impulsive or periodic character, the permissible limits for each octave band shall be reduced by five decibels. | ||
Sound levels shall be measured at the lot line with a sound level meter and associated octave band filter manufactured according to standards prescribed by the American Standards Association. | ||
P.V. = 6.28 F x D |
P.V. = Particle velocity (inches per second) |
F = Vibration frequency (cycles per second) |
D = Single amplitude displacement of the vibration (inches) |
Table 27-12-II designates the applicable columns of Table 27-12-III that apply on or beyond adjacent lot lines within the zone, and on or beyond appropriate district boundaries. Vibration shall not exceed the maximum permitted particle velocities in Table 27-12-III. Where more than one set of vibration levels apply, the most restrictive shall govern. Readings may be made at points of maximum vibration intensity. |
Table 27-12-II | ||
|---|---|---|
Abutting Zoning District | Adjacent Lot Line | |
I-C - Industrial/Commercial District | A | B |
The maximum peak particle velocities that correspond to the above designations are as follows: |
Table 27-12-III | ||
|---|---|---|
Maximum Peak Particle Velocity - in/sec | ||
VIBRATION | A | B |
Steady State | 0.02 | 0.10 |
Impact | 0.04 | 0.20 |
Table 27-12-IV | ||
|---|---|---|
Storage Capacity of Flammable Liquids and Gases | ||
Liquids | Gases | |
Above Ground Flash Point, F | Above Ground | |
Less than 70 | 70-200 | |
7,500 Gal. | 30,000 Gal. | 225,000 SCF* |
Below Ground Flash Point, F | Below Ground | |
15,000 Gal. | 60,000 Gal. | 450,000 SCF* |
Notes: | |
|---|---|
* | SCF-Standard Cubic Feet at 60 F. and 29.92 Inches Hi. |