HomeMy WebLinkAbout29- Appellant Ex 4 Adam Jenkins Report(206) 378-0569 (855) 476-2874 www.greenbusch.com
1900 W Nickerson St., #201, Seattle, WA 98119 2262 N Albina Ave., #340 Portland, OR 97227
Memorandum
DATE: April 22, 2022
TO: Alex Sidles – Bricklin and Newman
FROM: Adam C. Jenkins, PE, INCE Bd. Cert.
Justin Morgan, INCE
RE: Pomona Woods Acoustical Review
INTRODUCTION
The intent of this memorandum is to present the results of an acoustical analysis
conducted of the proposed Pomona Woods development (site) located at 3030 Oak Bay
Road in Port Hadlock, Washington. This analysis included measurements to document
existing sound levels near the site and predicted sound levels from construction and
operations of the completed facility, which are both absent from the application record.
SUMMARY
Average existing sound levels measured near the site are 39 dBA (hourly L25) during
daytime hours and 31 dBA (hourly L25) at night. These existing sound levels are 16 dB
and 14 dB below daytime and nighttime code limits, respectively. If the project is designed
to meet the sound limits defined in the Washington Administrative Code, the minimum
legal requirement, significant adverse noise impacts are likely at nearby properties.
Furthermore, sound emissions from construction of the facility are not limited by code and
would likely be much higher. Our predictions result in construction sound levels up to 24
dB above existing daytime sound levels.
We propose the project be conditioned as follows to mitigate these effects:
Limit typical hourly noise emissions from the facility to 44 dBA during the day and
36 dBA at night, based on an hourly L25 metric.
Limit hourly maximum noise emissions from the facility to 59 dBA during the day
and 51 dBA at night based on an hourly LAFmax metric.
Require a noise analysis be prepared by a qualified acoustical consultant that
predicts emissions from facility construction and operations to satisfy the sound
level limits above, with any necessary mitigation. This noise study shall also
include mitigation measures to reduce nuisance elements of construction noise,
such as banging of truck gates, workers yelling on-site, tonal backup alarms, etc.
Exhibit 29
Exhibit 29 Page 0508
April 22, 2022
Page 2
Pomona Woods Acoustical Review
(206) 378-0569 (855) 476-2874 www.greenbusch.com
1900 W Nickerson St., #201, Seattle, WA 98119 2262 N Albina Ave., #340 Portland, OR 97227
NOMENCLATURE
The auditory response to sound is a complex process that occurs over a wide range of
frequencies and intensities. The decibel level, or “dB,” is a form of shorthand that
compresses this broad range of intensities into a convenient numerical scale. The decibel
scale is logarithmic. For example, using the decibel scale, a doubling or halving of energy
causes the sound level to change by 3 dB; it does not double or halve the perceived
loudness as might be expected.
The minimum sound level variation perceptible to a human observer is generally around
3 dB. A 5 dB change is clearly perceptible, and an 8 to 10-dB change is associated with
a perceived doubling or halving of loudness. Common sound pressure levels are reported
in Table 1. Mathematical descriptors have been developed to provide better assessment
of sounds that vary over time and the human response to them.
Equivalent Sound Level, Leq, is the level of a constant sound having the same
energy content as the actual time-varying level during a specified interval. The Leq
is used to characterize complex, fluctuating sound levels with a single number.
Typical intervals for Leq are hourly, daily, and annually.
Maximum Sound Level, Lmax, is the maximum recorded root mean square (rms)
sound level for a given time interval or event. Lmax can be defined for two time
weightings, “slow” and “fast.” “Slow” uses 1-second time constant, and “fast” uses
a 125-millisecond time constant. For transient events of short duration, Lmax “fast”
will be greater than Lmax “slow.” Lmax “fast” is used throughout this report.
Percentage Sound Level, L(n) – L(n), is the sound level that is exceeded n percent
of the time; for example, L08 is the level exceeded 8% of the time. L25 is the sound
level exceeded 25% of the time.
Sound Pressure Level, SPL, correlates with what is heard by the human ear. SPL
is defined as the squared ratio of the sound pressure with reference to 20
micropascal (μPa). Sound pressure is affected by distance, path, barriers,
directivity, etc. All sound pressure levels referenced in this document utilize this
reference pressure.
Exhibit 29 Page 0509
April 22, 2022
Page 3
Pomona Woods Acoustical Review
(206) 378-0569 (855) 476-2874 www.greenbusch.com
1900 W Nickerson St., #201, Seattle, WA 98119 2262 N Albina Ave., #340 Portland, OR 97227
Table 1. A-Weighted Levels of Common Sounds, dBA
Sound Sound
Level
Approximate
Relative Loudness1
Jet Plane at 100 feet 130 128
Rock Music with Amplifier 120 64
Thunder, Danger of Permanent Hearing Loss 110 32
Boiler Shop, Power Mower 100 16
Orchestral Crescendo at 25 feet 90 8
Busy Street 80 4
Interior of Department Store 70 2
Ordinary Conversation at 3 feet 60 1
Quiet Car at Low Speed 50 1/2
Average Office 40 1/4
City Residence, Interior 30 1/8
Quiet Country Residence, Interior 20 1/16
Rustle of Leaves 10 1/32
Threshold of Hearing 0 1/64
1. As compared to ordinary conversation at 3 feet
Source: US Department of Housing and Urban Development, Aircraft Noise Impact Planning Guidelines for Local Agencies,
November 1972
REGULATORY CRITERIA
Sound emissions from the site are regulated by the Jefferson County Code (JCC) and the
State of Washington Administrative Code (WAC).
Jefferson County Code
Noise is regulated within unincorporated Jefferson County by JCC Chapter 8.70. JCC
Chapter 8.70 is a nuisance type ordinance and does not include specific sound limits. A
violation of JCC Chapter 8.70 is defined in JCC Chapter 8.70.040 as follows:
“Within unincorporated Jefferson County, it shall be a violation of this chapter for any
person to generate, produce, disseminate or cause, or for any person in possession of
control of property, including a motor vehicle, to allow a “public nuisance noise” which law
enforcement determines unreasonably disturb(s) or interfere(s) with the peace, comfort
and repose of reasonable person of normal hearing, including property owners or
possessors of property in a different location, or citizens in public area.”
Public nuisance noises are identified in JCC Chapter 8.70.050 and include the following:
Sounds originating from properties exceeding the sound limits permitted under
WAC Chapter 173-60 (JCC Chapter 8.70.050(1)).
Exhibit 29 Page 0510
April 22, 2022
Page 4
Pomona Woods Acoustical Review
(206) 378-0569 (855) 476-2874 www.greenbusch.com
1900 W Nickerson St., #201, Seattle, WA 98119 2262 N Albina Ave., #340 Portland, OR 97227
Between the hours of 10:00 PM and 7:00 AM Sunday through Thursday or
between 11:00 PM and 7:00 AM on Friday or Saturday, any sound made by
persons or by use of a musical instrument, whistle, sound amplifier, portable audio
equipment, or other device, electronic or not, capable of producing or reproducing
sound, which sound emanates frequently, repetitively, or continuously from any
social gathering, building, structure, or property, such as sound originating from a
band session, tavern or bar operation, an indoor or outdoor social gathering, and
where law enforcement determines the volume of such sound is such that it can
be clearly heard by a person of normal hearing at a location which is 150 feet or
more from the source of the sound and not located on the property containing the
source of the sound (JCC Chapter 8.70.050(4)).
Sound from portable audio equipment, including that found in or as part of a motor
vehicle audio system, while traveling or parked in public streets, or in park areas,
residential and commercial zones, or any area where residences, schools, human
service facilities, or commercial establishments are in obvious proximity to the
source of the sound, and where the volume of such audio equipment is such that
law enforcement determines it can be clearly heard by a person of normal hearing
at a distance of 150 feet or more from the source of the sound; provided, however,
that this section shall not apply to persons operating portable audio equipment
within a public park pursuant to an event sanctioned by a responsible authority
under valid permit or license (JCC Chapter 8.70.050(5)).
Between the hours of 10:00 PM and 7:00 AM Sunday through Thursday or
between 11:00 PM and 7:00 AM on Friday or Saturday, frequent, repetitive, or
continuous yelling, shouting, hooting, whistling or singing, with or without electronic
amplification, which law enforcement determines can be clearly heard by a person
of normal hearing at a location which is 150 feet or more from the source of the
sound and not located on the property containing the source of the sound (JCC
Chapter 8.70.050(6)).
Sound which law enforcement determines unreasonably disturbs or interferes with
the peace, comfort, and repose of one or more reasonable persons of normal
hearing, regardless of the distance between the source of the public nuisance
noise and the person(s) being unreasonably disturbed or annoyed. Under this
subsection, a sound meter reading is not necessary to establish that a public
nuisance noise exists (JCC Chapter 8.70.050(11)).
In addition to listing noises considered a public nuisance JCC Chapter 8.70.060 identifies
sound sources that are exempt from JCC Chapter 8.70 regulations. These exemptions
include the following:
Officially sanctioned civic or park events and amplified or unamplified sounds as
allowed by a special event permit (JCC Chapter 8.70.060(2)).
Bells, chimes, and carillons not operating continuously for more than five minutes
(JCC Chapter 8.70.060(6)).
Exhibit 29 Page 0511
April 22, 2022
Page 5
Pomona Woods Acoustical Review
(206) 378-0569 (855) 476-2874 www.greenbusch.com
1900 W Nickerson St., #201, Seattle, WA 98119 2262 N Albina Ave., #340 Portland, OR 97227
Warning, safety, or protective devices not operating continuously for more than
five minutes, including, but not limited to, back-up warning signals (JCC Chapter
8.70.060(7)).
Generators during periods when there is no electrical service available from the
primary supplier due to power outage, where a generator is the only available
source of electrical power, and the normal periodic testing of generators during
daytime hours (JCC Chapter 8.70.060(11)).
Between the hours of 7:00 AM and 10:00 PM, sounds originating from residential
property as a result of temporary projects for the construction, maintenance, or
repair of home, grounds, and appurtenances (JCC Chapter 8.70.060(16)).
State of Washington Administrative Code
As noted in JCC Chapter 8.70.050(1), sounds originating from properties that exceed the
sound limits permitted under WAC Chapter 173-60 are considered a public nuisance.
Permissible noise levels established in WAC 173-60 are defined by the environmental
designation for noise abatement (EDNA) of the area, which is based upon present, future,
and historical land use as follows:
Class A EDNA – “Lands where human beings reside and sleep,” such as
residential dwellings and recreational properties for human habitation.
Class B EDNA – “Lands involving uses requiring protection against noise
interference with speech,” such as commercial properties, recreational facilities not
used for human habitation and educational facilities.
Class C EDNA – “Lands involving economic activities of such a nature that higher
noise levels than experienced in other areas is normally to be anticipated,” such
as industrial facilities.
Maximum permissible sound levels specified in WAC Chapter 173-60-040 are provided
in Table 2.
Table 2. Maximum Permissible Sound Levels, dBA
EDNA of Source
Property
EDNA of Receiving Property
Class A Class B Class C
Class A 55 57 60
Class B 57 60 65
Class C 60 65 70
Source: WAC Chapter 173-60
The Site and nearby properties are considered Class A EDNA.
Modifications to the sound limits shown in Table 2 are provided in WAC 173-60-040 and
are as follows:
Sound levels are reduced by 10 dB between the hours of 10:00 PM and 7:00 AM
for Class A EDNA receiving properties.
Exhibit 29 Page 0512
April 22, 2022
Page 6
Pomona Woods Acoustical Review
(206) 378-0569 (855) 476-2874 www.greenbusch.com
1900 W Nickerson St., #201, Seattle, WA 98119 2262 N Albina Ave., #340 Portland, OR 97227
Sound level increases for short durations for any receiving property at any time as
follows:
o 5 dB for a total of 15 minutes in any one-hour period; or
o 10 dB for a total of 5 minutes in any one-hour period; or
o 15 dB for a total of 1.5 minutes in any one-hour period.
The WAC does not provide the noise metric the limits shown in Table 2 are applied to.
However, it is common industry practice to apply the sound limits shown in Table 2 and
the allowable increases to the hourly Ln metrics shown in Table 3.
Table 3. Project Sound Limits, dBA
Descriptor Maximum Time
Over Code
WAC Limits
(day/night)
L25 (Code Limit) - 55/45
L08 (Code + 5) 15 minutes 60/50
L02 (Code + 10) 5 minutes 65/55
Lmax (Code + 15) 1.5 minutes 70/60
EXISTING SOUND LEVELS
Sound levels were measured at one location near the site between April 15 and April 16,
2022, and between April 18 and April 20, 2022, to document the existing ambient sound
environment. Due to an equipment malfunction only 24 hours of data was collected
between April 15 and April 16, 2022. However, the equipment was replaced on April 18,
2022, and collected an additional 49 hours of data between April 18 and April 20, 2022.
Wind conditions ranged between calm and 4 miles per hour, generally from the west and
west-southwest. Temperatures ranged between 34- and 55-degrees Fahrenheit. There
was 1.14 inches of precipitation on April 18, 2022. The microphones were equipped with
environmental windscreens during the measurements.
Equipment used during the measurement are identified in Table 4.
Table 4. Measurement Equipment
Make and Model Description Serial Number
Svantek 971 Sound Level Analyzer 51818
Svantek SV18 Preamplifier 49561
Aco Pacific 7052E Microphone 62522
Larson Davis CAL200 Acoustic Calibrator 9512
Svantek 971 Sound Level Analyzer 72542
Svantek SV18 Preamplifier 72239
Aco Pacific 7052E Microphone 68284
Larson Davis CAL200 Acoustic Calibrator 16827
Exhibit 29 Page 0513
April 22, 2022
Page 7
Pomona Woods Acoustical Review
(206) 378-0569 (855) 476-2874 www.greenbusch.com
1900 W Nickerson St., #201, Seattle, WA 98119 2262 N Albina Ave., #340 Portland, OR 97227
All equipment was calibrated at a certified laboratory within one year of the measurement
date. Field calibrations were made before and immediately after the measurement was
completed. A photo of the measurement equipment is shown in Figure 1 and the
deployment location is shown in Figure 2.
Figure 1. Measurement Equipment
Figure 2. Ambient Measurement Location
Local noise sources near the measurement location included aircraft and nature sounds.
The range and median sound levels measured near the site are shown in Table 5. Sound
levels recorded during each hour are provided in the Appendix.
Exhibit 29 Page 0514
April 22, 2022
Page 8
Pomona Woods Acoustical Review
(206) 378-0569 (855) 476-2874 www.greenbusch.com
1900 W Nickerson St., #201, Seattle, WA 98119 2262 N Albina Ave., #340 Portland, OR 97227
Table 5. Measured Hourly Sound Levels, Low-High (Median), dBA
Noise Metric WAC Limit Measured Sound Level
Daytime Nighttime Daytime Nighttime
L25 55 45 29-52 (39) 23-40 (31)
L08 60 50 32-53 (42) 24-43 (34)
L02 65 55 34-54 (48) 28-47 (38)
Lmax 70 60 48-70 (61) 33-95 (51)
POTENTIAL NOISE EFFECT CRITERIA
Permissible sound levels under WAC are 55 dBA during the day and 45 dBA at night.
These codified limits are independent of ambient conditions, and therefore do not address
effects from increases to existing noise levels.
To assess potential noise effects from increasing ambient conditions in the community,
this analysis relies on guidelines presented in the document titled “Environmental Impact
Statement Guidelines” (EPA Region X, 1973). In the published document, increases in
noise are discussed in relation to expected community response to the introduced noise
source. The responses are described as follows:
Up to a 5 dB increase – few complaints if gradual increase
5 to 10 dB increase – more complaints, especially during sleeping hours
Over 10 dB increase – substantial number of complaints
The EPA guidelines are not standards and do not have the force of law but do serve as
useful indicators for potential noise effects pursuant to SEPA.
ANALYSIS
The primary tool used to predict sound levels at neighboring property lines was the 3-D
computer noise modeling software environment, Cadna/A. Cadna/A utilizes the CADNA
(Control of Accuracy and Debugging for Numerical Applications) computation engine
developed by the Pierre et Marie Curie University of Paris. The model used for the project
utilized the International Organization for Standardization 9613 Part II algorithms,
implemented in the Cadna/A software, which accounted for the effects of distance,
topography, and surface reflections on sound levels.
Modeling Ln noise metrics is difficult due to variability in operating times and sound
durations. Therefore, this analysis assumes that L25 and Leq sound levels are similar,
which is customary for noise analyses under WAC. The modeling process is typically
accurate within 3 dB. Conservative assumptions were used in the model created for this
project to ensure sufficient design margin within the predicted sound levels. Therefore,
predicted sound levels can be compared to regulatory criteria directly, without
consideration of additional design margin.
Exhibit 29 Page 0515
April 22, 2022
Page 9
Pomona Woods Acoustical Review
(206) 378-0569 (855) 476-2874 www.greenbusch.com
1900 W Nickerson St., #201, Seattle, WA 98119 2262 N Albina Ave., #340 Portland, OR 97227
The locations of property lines used in the model are based on data downloaded from the
Jefferson County Geographical Information System (GIS) and topographical data was
obtained from LiDAR data. The locations of on-site buildings and the driveway are based
on site drawings approved by Jefferson County on March 2, 2022.
Activities and equipment included in the computer noise model are shown in Table 6, and
are based on information present in the application record and our professional
experience. It should be noted that the generator is exempt under JCC Chapter 8.70 and
unamplified voices are not considered a nuisance during daytime hours, but they have
been included in this analysis to assess potential increases to existing sound levels.
Table 6. Modeled Activities and Equipment
Activity Operating Time Equipment Notes
Construction Daytime only
Dump truck,
excavator, air
compressor
One dump truck
arriving and leaving
the site each hour
traveling at 10 mph.
Mechanical
Equipment
Daytime and
nighttime Rooftop equipment
One unit modeled on
roof of Retreat
Building.
Vehicle Traffic Daytime only Cars
18 cars arriving or
departing the site
each hour traveling
at 15 mph. Exhibit
19 notes there will
be approximately 48
average daily trips.
Outdoor Use Daytime only Human voices
35 people speaking
outdoors, gathered
near the porch .
Generator
Daytime only
(assumes
daytime testing)
Rooftop equipment
and at-grade
generator
Generator located at
south side of Retreat
Building.
Garbage
Collection Daytime only Garbage truck and
rooftop equipment
One round trip by
garbage truck
traveling at 15 mph.
Combination Daytime only
Mechanical
equipment, vehicle
use, and human
voices
Mechanical
equipment, vehicle
traffic, and outdoor
use activities
occurring in the
same hour.
Exhibit 29 Page 0516
April 22, 2022
Page 10
Pomona Woods Acoustical Review
(206) 378-0569 (855) 476-2874 www.greenbusch.com
1900 W Nickerson St., #201, Seattle, WA 98119 2262 N Albina Ave., #340 Portland, OR 97227
Construction equipment sound levels used in this analysis are based upon levels defined
in the Federal Highway Administration (FHWA) Construction Noise Control Specification
721.560. FHWA 721.560 sound levels are maximum sound levels (Lmax) 50 feet from the
sound source. The FHWA construction equipment sound levels and the predicted
percentage of an hour each piece of equipment is anticipated to operate (acoustical
usage factor) are shown in Table 7.
Vehicle traffic sound levels are based on data previously collected by the Greenbusch
Group. Human voice levels are based on the US Department of Housing and Urban
Development, Aircraft Noise Planning Guidelines for Local Agencies, issued in November
1972. Generator and mechanical equipment sound levels were adjusted to comply with
daytime and nighttime WAC sound limits.
Sound pressure levels and distances from the equipment are provided in Table 7.
Table 7. Modeled Sound Levels, dBA
Sound Source Distance, Feet Sound Pressure Level
Air Compressor 50 80 (40% usage factor)
Dump Truck 50 84
Excavator 50 85 (40% usage factor)
Garbage Truck1 50 84
Generator2 50 70
Human Voice 3 60
Mechanical Equipment2 3 89
Vehicle 50 58
1. Sound data from dump truck used
2. Sound levels adjusted to comply with WAC sound limits
RESULTS
The highest predicted sound level at receiving property lines and at the ambient
measurement location, and the predicted increase to existing sound levels are shown in
Table 8.
Exhibit 29 Page 0517
April 22, 2022
Page 11
Pomona Woods Acoustical Review
(206) 378-0569 (855) 476-2874 www.greenbusch.com
1900 W Nickerson St., #201, Seattle, WA 98119 2262 N Albina Ave., #340 Portland, OR 97227
Table 8. Predicted Sound Levels Increases to Existing Sound Levels, dBA
Activity
Predicted Sound
Level1 Median
Existing
Sound Level,
L25
Increase to Existing
Sound Levels
Property
Line
Ambient
Location
Property
Line
Ambient
Location
Construction 63 58 39 (daytime) 24 19
Mechanical 44 38 31 (nighttime) 13 7
Vehicle Traffic 34 24
39 (daytime)
- -
Outdoor Use 26 24 - -
Generator 55 50 16 11
Garbage 53 46 14 7
Combination 44 39 5 -
1. Sound levels are predicted 5 feet above grade and reported property line sound levels represent the highest predicted sound
level at receiving property lines.
As shown in Table 8 predicted sound levels during construction are anticipated to be up
to 24 dB louder than existing daytime sound levels and the continuous operation of the
buildings mechanical equipment could be up to 13 dB above nighttime ambient sound
levels.
Exhibit 29 Page 0518
April 22, 2022
Page 12
Pomona Woods Acoustical Review
(206) 378-0569 (855) 476-2874 www.greenbusch.com
1900 W Nickerson St., #201, Seattle, WA 98119 2262 N Albina Ave., #340 Portland, OR 97227
APPENDIX
Table 9. Measured Hourly L25 Sound Levels, dBA
Start of
Hour
L25
4/15/2022 4/16/2022 4/17/2022 4/18/2022 4/19/2022 4/20/2022
12:00 AM 25 31 23
1:00 AM 27 33 23
2:00 AM 25 34 24
3:00 AM 29 31 26
4:00 AM 27 29 29
5:00 AM 32 36 36
6:00 AM 34 37 40
7:00 AM 33 37 41
8:00 AM 36 37 43
9:00 AM 38 38 40
10:00 AM 38 38 40
11:00 AM 38 39 40
12:00 PM 44 40 44
1:00 PM 44 40 46
2:00 PM 42 52 37 47
3:00 PM 41 51 37
4:00 PM 40 50 34
5:00 PM 39 46 35
6:00 PM 35 43 33
7:00 PM 38 47 32
8:00 PM 37 47 31
9:00 PM 34 44 29
10:00 PM 31 34 31
11:00 PM 24 32 25
Exhibit 29 Page 0519
April 22, 2022
Page 13
Pomona Woods Acoustical Review
(206) 378-0569 (855) 476-2874 www.greenbusch.com
1900 W Nickerson St., #201, Seattle, WA 98119 2262 N Albina Ave., #340 Portland, OR 97227
Table 10. Measured Hourly L08 Sound Levels, dBA
Start of
Hour
L08
4/15/2022 4/16/2022 4/17/2022 4/18/2022 4/19/2022 4/20/2022
12:00 AM 27 33 26
1:00 AM 29 35 24
2:00 AM 26 36 30
3:00 AM 31 35 29
4:00 AM 29 33 35
5:00 AM 36 40 40
6:00 AM 39 40 43
7:00 AM 36 39 43
8:00 AM 43 41 45
9:00 AM 42 42 42
10:00 AM 41 41 42
11:00 AM 42 42 43
12:00 PM 46 43 48
1:00 PM 46 42 49
2:00 PM 45 53 40 50
3:00 PM 46 53 44
4:00 PM 43 52 37
5:00 PM 44 48 41
6:00 PM 40 47 40
7:00 PM 41 50 38
8:00 PM 39 50 39
9:00 PM 36 47 32
10:00 PM 34 37 38
11:00 PM 27 35 30
Exhibit 29 Page 0520
April 22, 2022
Page 14
Pomona Woods Acoustical Review
(206) 378-0569 (855) 476-2874 www.greenbusch.com
1900 W Nickerson St., #201, Seattle, WA 98119 2262 N Albina Ave., #340 Portland, OR 97227
Table 11. Measured Hourly L02 Sound Levels, dBA
Start of
Hour
L02
4/15/2022 4/16/2022 4/17/2022 4/18/2022 4/19/2022 4/20/2022
12:00 AM 31 35 34
1:00 AM 36 38 30
2:00 AM 28 39 37
3:00 AM 34 39 37
4:00 AM 32 38 38
5:00 AM 39 45 43
6:00 AM 44 45 47
7:00 AM 40 42 45
8:00 AM 50 49 48
9:00 AM 48 51 45
10:00 AM 45 46 48
11:00 AM 51 44 46
12:00 PM 51 48 53
1:00 PM 51 46 52
2:00 PM 51 54 48 53
3:00 PM 54 54 51
4:00 PM 47 54 42
5:00 PM 52 51 48
6:00 PM 48 50 46
7:00 PM 45 52 45
8:00 PM 42 51 48
9:00 PM 39 49 34
10:00 PM 42 41 44
11:00 PM 35 41 38
Exhibit 29 Page 0521
April 22, 2022
Page 15
Pomona Woods Acoustical Review
(206) 378-0569 (855) 476-2874 www.greenbusch.com
1900 W Nickerson St., #201, Seattle, WA 98119 2262 N Albina Ave., #340 Portland, OR 97227
Table 12. Measured Hourly Lmax Sound Levels, dBA
Start of
Hour
Lmax
4/15/2022 4/16/2022 4/17/2022 4/18/2022 4/19/2022 4/20/2022
12:00 AM 95 48 47
1:00 AM 58 51 46
2:00 AM 33 48 48
3:00 AM 52 52 49
4:00 AM 51 48 48
5:00 AM 46 62 53
6:00 AM 63 69 56
7:00 AM 58 54 51
8:00 AM 70 62 61
9:00 AM 64 62 52
10:00 AM 61 62 64
11:00 AM 66 56 54
12:00 PM 70 60 62
1:00 PM 62 60 57
2:00 PM 69 61 60 69
3:00 PM 68 60 63
4:00 PM 58 65 58
5:00 PM 67 61 57
6:00 PM 61 58 59
7:00 PM 55 66 55
8:00 PM 56 61 59
9:00 PM 50 56 48
10:00 PM 55 59 55
11:00 PM 52 51 49
Exhibit 29 Page 0522