Design and Performance Standards
Angle of Parking Space (degrees) | One-Way Aisle (feet) | Two-Way Aisle (feet) | |
|---|---|---|---|
90 | 24 | 24 | |
60 | 18 | 20 | |
45 | 13 | 18 | |
30 | 12 | 18 | |
Parallel | 12 | 18 |
Loading Space | Apron/Aisle Length | |||
|---|---|---|---|---|
Length (feet) | Width (feet) | 90 Degrees (feet) | 60 Degrees (feet) | |
60 | 10 | 72 | 66 | |
60 | 12 | 63 | 57 | |
60 | 14 | 60 | 54 | |
Frequency Band Cycles Per Second | |
|---|---|
20 to 75 | |
75 to 150 | |
150 to 300 | |
300 to 600 | |
600 to 1,200 | |
1,200 to 2,400 | |
2,400 to 4,800 | |
4,800 to 9,600 |
Sound Pressure Level In Decibels* | |
|---|---|
69 | |
54 | |
47 | |
41 | |
37 | |
34 | |
31 | |
28 |
* | According to the following formula: Sound pressure level in decibels equals 20 log P/P-2 where P-2 equals 0.0002 dynes per square centimeter. |
Type of Operation or Character of Noise | Correction in Decibels | |
|---|---|---|
Daytime operation only | -5 | |
Noise source operates less than 20% of the time | -5* | |
Noise source operates less than 5% of the time | -10* | |
Noise source operates less than 1% of the time | -15* | |
Noise of impulsive character (hammering, etc.) | -5 | |
Noise of periodic character (hum, screech, etc.) | -5 |
* | Apply one of these corrections only. |
Design and Performance Standards
Angle of Parking Space (degrees) | One-Way Aisle (feet) | Two-Way Aisle (feet) | |
|---|---|---|---|
90 | 24 | 24 | |
60 | 18 | 20 | |
45 | 13 | 18 | |
30 | 12 | 18 | |
Parallel | 12 | 18 |
Loading Space | Apron/Aisle Length | |||
|---|---|---|---|---|
Length (feet) | Width (feet) | 90 Degrees (feet) | 60 Degrees (feet) | |
60 | 10 | 72 | 66 | |
60 | 12 | 63 | 57 | |
60 | 14 | 60 | 54 | |
Frequency Band Cycles Per Second | |
|---|---|
20 to 75 | |
75 to 150 | |
150 to 300 | |
300 to 600 | |
600 to 1,200 | |
1,200 to 2,400 | |
2,400 to 4,800 | |
4,800 to 9,600 |
Sound Pressure Level In Decibels* | |
|---|---|
69 | |
54 | |
47 | |
41 | |
37 | |
34 | |
31 | |
28 |
* | According to the following formula: Sound pressure level in decibels equals 20 log P/P-2 where P-2 equals 0.0002 dynes per square centimeter. |
Type of Operation or Character of Noise | Correction in Decibels | |
|---|---|---|
Daytime operation only | -5 | |
Noise source operates less than 20% of the time | -5* | |
Noise source operates less than 5% of the time | -10* | |
Noise source operates less than 1% of the time | -15* | |
Noise of impulsive character (hammering, etc.) | -5 | |
Noise of periodic character (hum, screech, etc.) | -5 |
* | Apply one of these corrections only. |