Table I
Maximum Permissible Sound-Pressure Levels
Measured re 0.0002 dyne per CM2
| |
---|---|
Frequency Band
(cycles per second)
|
Decibels
|
20 - 75
|
74
|
75 - 150
|
59
|
150 - 300
|
52
|
300 - 600
|
46
|
600 - 1,200
|
42
|
1,200 - 2,400
|
39
|
2,400 - 4,800
|
35
|
4,800 - 10,000
|
32
|
Table II — Correction Factors
| |
---|---|
Condition
|
Correction in Decibels
|
On a site contiguous to or across a street from
the boundary of any residence district established by this chapter
or the Zoning Ordinance of any other municipality
|
Minus 5
|
Operation between the hours of 10:00 p.m. and
7:00 a.m.
|
Minus 5
|
Sound of impulsive character (e.g., hammering)
|
Minus 5
|
Sound of periodic character (e.g., hum or screech)
|
Minus 5
|
Sound source operated less than:
| |
10% in any one-hour period
|
Plus 5*
|
2% in any one-hour period
|
Plus 10*
|
* NOTE: Apply only one of these corrections.
All other corrections, including any of the starred corrections, are
cumulative.
|