[Amended 2-12-2008 by Ord. No. 2414]
Maximum noise level limits, NLL, are established in Table 264-10,
and are a function of their zoning district location and time of the
day. Noise level limits specified in Table 264-10 will not be exceeded
at a receiving property by noise being generated at a source location.
Noise level limits are fifteen-minute A-weighted LEQ's unless otherwise specified in this chapter by another metric based
on these limit values.
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Table 264-10
Noise Level Limits, NLL
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|---|---|---|---|---|---|---|
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Time of Day
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Zoning District
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Dawn
4:30 a.m. to 7:00 a.m.
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Day
7:00 a.m. to 7:00 p.m.
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Evening
7:00 p.m. to 10:00 p.m.
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Night
10:00 p.m. to 12:00 a.m.
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|
S-1 Conservancy (landfills only)*
|
58
|
68
|
58
|
58
| ||
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NOTES:
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|---|---|
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*
|
Landfills operate from 4:30 a.m. to 12:00 a.m., as amended by
the DEP Rules and Regulations.
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|
Time of Day
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|---|---|---|---|---|---|---|
|
Zoning District
|
Day
7:00 a.m. to 6:00 p.m.
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Evening
6:00 p.m. to 10:00 p.m.
|
Night
10:00 p.m. to 7:00 p.m.
| |||
|
S-1 Conservancy (all other uses)
|
55
|
50
|
45
| |||
|
R-1 One-Family Residential
|
55
|
50
|
45
| |||
|
R-2 One-Family Residential
|
55
|
50
|
45
| |||
|
R-2T One-Family Residential
|
55
|
50
|
45
| |||
|
R-3 One-Family Residential
|
55
|
50
|
45
| |||
|
R-4 Multifamily Residential
|
60
|
55
|
50
| |||
|
R-5 Multifamily Residential
|
60
|
55
|
50
| |||
|
L Special Use
|
60
|
55
|
50
| |||
|
C-1 Shopping Commercial
|
60
|
60
|
60
| |||
|
C-2 Business Commercial
|
60
|
60
|
60
| |||
|
C-3 Commercial
|
60
|
60
|
60
| |||
|
M-1 Planned Industrial
|
65
|
65
|
65
| |||
|
M-2 Industrial
|
65
|
65
|
65
| |||
Maximum noise levels limits of Table 264-10 are subject to the
following exclusions, including:
A.
Any domestic power equipment operated upon any conservancy, residential,
commercial, industrial or special use zoned property, between the
hours of 9:00 a.m. and 7:00 p.m., may exceed the fifteen-minute A-weighted
LEQ noise level limits of Table 264-10, by
no more than 10 dBA, provided the equipment is in good working order
and meets or exceeds the original manufacturer's noise level specifications.
This equipment may exceed the NLL by more than 20 dBA provided the
total time above the NLL does not exceed one hour per day or three
hours per week. If a noise specification does not exist, the equipment
must have the same noise level or less noise with similar or improved
noise characteristics as the original equipment as manufactured and
used as intended.
B.
Any existing HVAC equipment operated upon any conservancy, residential,
commercial, industrial or special use zoned property may exceed the
NLL of Table 264-10 if the equipment is in good operating condition
and does not exceed the original manufacturer noise level specifications
as when manufactured and placed in operation on the property. If a
noise specification does not exist, it must have the same noise level
and characteristics as the original equipment as manufactured and
intended to be used. New and/or replacement HVAC equipment must comply
with the noise level limits as set forth in Table 264-10.
C.
Any transportation and/or warning device noise regulated by state
and federal laws may exceed the limits of Table 264-10 if these statues
specify limiting noise levels provided that this equipment is being
operated in a lawful manner.
D.
The noise of the warning devices on emergency vehicles may exceed
the limits of Table 264-10, Noise Level Limits.
E.
Noise of construction and the operation of heavy equipment used for
construction may exceed the limits of Table 264-10, Noise Level Limits,
during the daytime work hours of 7:00 a.m. to 7:00 p.m. but reasonable
efforts must be made to minimize noise generation of all operations.
All equipment must be in good working order with noise levels as when
new. All equipment will be muffled to the extent that is technically
feasible. Long-term projects exceeding two months will be required
to use best available equipment that has state-of-the-art noise suppression.
F.
Emergency generators may exceed the NLL of Table 264-10 during emergency
use but the noise levels of routine testing must occur during the
daytime work hours of 7:00 a.m. to 7:00 p.m. and the LEQ noise levels must not exceed the NLL value of Table 264-10 by more
than 20 dBA for more than one hour per week.
G.
Music, voices, paging systems, sound reinforcement systems, audio
amplification systems, televisions, radios, tape players, VCR equipment
and all similar equipment are subject to Table 264-10 except compliance
sound level measurements will be made with the "fast response" of
an ANSI Type 1 meter using the "LMAX" to properly
capture the short term bursts of noise energy. The LMAX sound level must not exceed the NLL value of Table 264-10.
H.
Impact/Impulse noise shall not exceed the NLL established in Table
264-10 by more than 20 dB as measured with the "LPEAK" of an ANSI Type 1 meter with peak measurement capabilities as defined
in ANSI standards.
I.
The noise of organized events requiring Municipality of Monroeville
permits will be excluded from the NLL for the duration of the permit.
The Zoning Officer will review the noise producing activities of the
event to control those that might produce unnecessary or unreasonable
noise based on the intent of this chapter.
J.
The normally occurring sounds and noises, i.e., voices, cheering
crowds, referee whistles, and bands, of nonprofit and community-based
sanctioned sporting, school, and college events are excluded. Sound
amplification and similar equipment are subject to the NLL of Table
264-10.
K.
Farm equipment used on commercial for-profit farming and nurseries
are excluded from this chapter provided the equipment is in good working
order and it meets the original noise levels of the equipment when
originally manufactured for that make and model.
L.
Privately owned animals and birds, excluding for-profit farm livestock,
are subject to the NLL using the LMAX.
M.
Refuse trucks operating on public streets for the purpose of household
collection may exceed the NLL by no more that 20 dBA during the day
time hours with occurrences limited to one fifteen-minute interval
per week. Commercial refuse collection, handling, and disposal will
meet the NLL at all times for evening and night hours. Noise during
the day may exceed the NLL by no more than 20 dBA.
N.
Snow removal equipment is excluded from this chapter during periods
of substantial snowfall and immediately there after until such time
both private and public roads, sidewalks, and parking lots are cleared
so as to prevent a hazard to citizens. Routine snow removal will be
limited to daytime hours. All equipment must be properly muffled and
efforts are to be made to avoid unneeded noise. All state, county,
and township snow-removal equipment is exempt from this chapter.
Noise measurements shall be made with a sound level meter, and
shall mean an apparatus or instrument that includes an omnidirectional
microphone, amplifier, attenuator, output meter and frequency weighting
networks for the measurements of sound levels. The sound level meter
shall be of a design and have the characteristics of a Type 1 or better
instrument as established by the American Nationals Standards Institute.
The sound level meter must meet or exceed the performance characteristics
of the meter when new that conforms to ANSI standards for sound level
meters. Laboratory calibrations by the manufacturer or a suitable
alternative will serve as a check on these performance characteristics.
Compliance measurements shall utilize current measurement techniques
and practices as specified by current ANSI standards and good practice.
The signal-to-noise ratio shall be 20 dB or more with a dynamic range,
that permits valid measurements. A properly calibrated sound meter
will be used in all compliance measurements. A field check calibration
of the sound meter shall be performed before and after the measurements
if feasible. Calibration tolerance will be 0.5 dB or less for a meter
and calibrator designed to be compatible and certified for use by
the manufacturer or an equivalent alternative. Measurement tolerances
will be within one dBA.
A.
If the normally occurring ambient noise along with the background
noise of the community exceeds the NLL values of Table 264-10,[1] then the "fast response" A-weighted sound level of the offending noise source must not exceed
the fifteen-minute L90 of the background noise
based using the NLL value of Table 264-10.
B.
Windscreens will be used with an acoustic attenuation characteristic
of one dBA or less as measured with a band limited white noise spectrum
in the 100 to 20K Hertz range. Wind noise (false sound) must be five
dBA less than the noise limit of Table 264-10. No corrections will
be made for wind noise.
C.
For screening purposes, an ANSI Type II meter can be used. Screening
measurements can be made with the "slow response" of the meter.
D.
Noise sources with deep bass sounds (substantial low frequency energy)
will be evaluated with an octave band analysis. Individual octave
band sound-pressure levels, OBSPL, will not exceed the following octave
band sound-pressure levels for NLL 45 and NLL 55. (The first line
contains the octave band center frequencies, OBCF, in Hertz. The following
two lines contain the respective octave band sound-pressure levels
for NLL 45 and 55 respectively.)
|
OBCF
|
31.5
|
63
|
125
|
250
|
500
|
1,000
|
2,000
|
4,000
|
8,000
|
Hz
|
|
NLL 45
|
70
|
65
|
60
|
55
|
50
|
45
|
40
|
35
|
30
|
dB
|
|
NLL 55
|
80
|
75
|
70
|
65
|
60
|
55
|
50
|
45
|
40
|
dB
|
E.
At no time shall the offending noise source at the source location
cause the interior noise level of a structure on the receiving property
to exceed the NLL of Table 264-10 as measured with the "fast response"
of an ANSI Type One sound level meter using the LMAX. Windows and doors may be open when compliance measurements are
made. Compliance will be based on measurements made at any interior
point that is more than one meter away from the planes that contain
the walls, floor, and/or ceiling. Only rooms with walls, floor, ceiling,
door(s), and window(s) with component construction that has a composite
STC of 25 or more are covered.
F.
Noise sources that produce a pure tone(s) or a line spectrum with
dominate tones will be penalized by 10 dBA to account for the tonal
character of the noise. A factor of 10 dBA will added to the measured
fifteen-minute LEQ. This numerical value will
be used to determine compliance with the NLL of Table 264-10.
A.
The use of motor vehicle horns is not permitted except for valid
"warning" situations specifically covered in the Motor Vehicle Code
of the State.
