Residential
|
Commercial/Industrial
| ||||
---|---|---|---|---|---|
Minimum
|
Maximum
|
Minimum
|
Maximum
| ||
One-way
|
10 feet
|
14 feet
|
12 feet
|
16 feet
| |
Two-way
|
12 feet
|
18 feet
|
22 feet
|
26 feet
|
Octave Band Center Frequency of Measurement
(Hz)
|
Octave Band Level for Business/Industrial
Zones in Decibels
|
Octave Band Level for Residential Zones
and for Uses Abutting Residential Zones
| |
---|---|---|---|
31.5
|
79
|
54
| |
63
|
78
|
53
| |
125
|
73
|
48
| |
250
|
68
|
45
| |
500
|
62
|
41
| |
1,000
|
56
|
37
| |
2,000
|
51
|
34
| |
4,000
|
47
|
32
| |
8,000
|
44
|
30
|
Notes:
| |||
---|---|---|---|
l.
|
Acoustical terminology is that most recently
approved by the American National Standards Institute (ANSI).
| ||
2.
|
Reference pressure shall be 0.0002 microbars.
| ||
3.
|
Hz is the abbreviation for Hertz, which means
cycles per second.
| ||
4.
|
For preliminary survey and monitoring the approximate
single number, 65 dB(A) may be used for commercial and industrial
zones and 40 dB(A) may be used for residential zones and for uses
abutting residential zones.
| ||
5.
|
dB(A) shall mean A-weighted sound pressure level
in decibels as measured on a general purpose sound-level meter complying
with the provisions of American Standard for General Purpose Sound-Level
Meters (Sl.4-1971), ANSI or OSI (1999), properly calibrated, and operated
on the “A” weighting network.
|
Zone
|
Screening Requirement
|
Buffer Width
| |
---|---|---|---|
I and B2
|
Greenbelt
|
30 feet
| |
IP
|
Greenbelt
|
40 feet
| |
B1
|
Barrier
|
5 feet
|