PC - Item 3B - Exhibit F - Appendix J Noise and Vibration Impact AnalysisAugust 2022
NOISE AND VIBRATION IMPACT ANALYSIS
MISSION VILLAS PROJECT
ROSEMEAD, CALIFORNIA
August 2022
NOISE AND VIBRATION IMPACT ANALYSIS
MISSION VILLAS PROJECT
ROSEMEAD, CALIFORNIA
Submitted to:
EPD Solutions, Inc.
2355 Main Street, Suite 100
Irvine, California 92614
Prepared by:
LSA
20 Executive Park, Suite 200
Irvine, California 92614
(949) 553-0666
Project No. ESL2201.32
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TABLE OF CONTENTS
FIGURES AND TABLES ............................................................................................................................. ii
LIST OF ABBREVIATIONS AND ACRONYMS ............................................................................................ iii
INTRODUCTION .......................................................................................................... 4
Project Location And Description .................................................................................................. 4
Existing Land Uses In The Project Area ......................................................................................... 4
NOISE AND VIBRATION FUNDAMENTALS .................................................................... 7
Characteristics of Sound ................................................................................................................ 7
Measurement of Sound................................................................................................................. 7
Physiological Effects of Noise ............................................................................................................. 8
Fundamentals of Vibration .......................................................................................................... 10
REGULATORY SETTING .............................................................................................. 12
Applicable Noise Standards ......................................................................................................... 12
California Code of Regulations ......................................................................................................... 12
City of Rosemead .............................................................................................................................. 12
Federal Transit Administration ......................................................................................................... 15
Applicable Vibration Standards ................................................................................................... 15
Federal Transit Administration ......................................................................................................... 16
OVERVIEW OF THE EXISTING NOISE ENVIRONMENT .................................................. 17
Ambient Noise Measurements ................................................................................................... 17
Long-Term Noise Measurements ..................................................................................................... 17
Existing Aircraft Noise ................................................................................................................. 18
PROJECT IMPACT ANALYSIS ...................................................................................... 20
Short-Term Construction Noise Impacts ..................................................................................... 20
Short-Term Construction Vibration Impacts ............................................................................... 23
Long-Term Off-Site Traffic Noise Impacts ................................................................................... 26
Long-Term Traffic-Related Vibration Impacts ............................................................................. 26
Best Construction Practices ......................................................................................................... 27
LAND USE COMPATIBILITY ........................................................................................ 28
Exterior Noise Assessment .......................................................................................................... 28
Interior Noise Assessment........................................................................................................... 28
REFERENCES ............................................................................................................. 29
APPENDICES
A: NOISE MONITORING DATA
B: CONSTRUCTION NOISE CALCULATIONS
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FIGURES AND TABLES
FIGURES
Figure 1: Project Location ....................................................................................................................... 5
Figure 2: Site Plan ................................................................................................................................... 6
Figure 3: Noise Monitoring Locations .................................................................................................. 19
TABLES
Table A: Definitions of Acoustical Terms ................................................................................................ 9
Table B: Common Sound Levels and Their Noise Sources.................................................................... 10
Table C: Noise/Land Use Compatibility Matrix..................................................................................... 13
Table D: Maximum Sound Levels for Source Land Uses ....................................................................... 15
Table E: General Assessment Construction Noise Criteria ................................................................... 15
Table F: Interpretation of Vibration Criteria for Detailed Analysis ...................................................... 16
Table G: Construction Vibration Damage Criteria ................................................................................ 16
Table H: Existing Noise Level Measurements ....................................................................................... 17
Table I: Typical Construction Equipment Noise Levels ......................................................................... 21
Table J: Potential Construction Noise Impacts at Nearest Receptor ................................................... 22
Table K: Vibration Source Amplitudes for Construction Equipment .................................................... 23
Table L: Potential Construction Vibration Annoyance Impacts at Nearest Receptor .......................... 24
Table M: Potential Construction Vibration Damage Impacts at Nearest Receptor ............................. 24
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LIST OF ABBREVIATIONS AND ACRONYMS
ADT average daily trips
ALUC Airport Land Use Compatibility
CEQA California Environmental Quality Act
City City of Rosemead
CNEL Community Noise Equivalent Level
dBA A-weighted decibel(s)
FHWA Federal Highway Administration
ft foot/feet
FTA Federal Transit Administration
FTA Manual FTA Transit Noise and Vibration Impact Assessment Manual
in/sec inch/inches per second
Ldn day-night average noise level
Leq equivalent continuous sound level
Lmax maximum instantaneous sound level
mi mile/miles
Noise Element City of Rosemead General Plan Noise Element
PPV peak particle velocity
project Mission Villas Project
EMT San Gabriel Valley Airport
RMS root-mean-square
STC Sound Transmission Class
VdB vibration velocity decibels
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INTRODUCTION
This noise and vibration impact analysis has been prepared to evaluate the potential noise and
vibration impacts and reduction measures associated with the proposed Mission Villas Project
(project) in Rosemead, California. This report is intended to satisfy the City of Rosemead’s (City)
requirement for a project-specific noise impact analysis by examining the impacts of the project site
and evaluating noise reduction measures that the project may require.
PROJECT LOCATION AND DESCRIPTION
The proposed project is located northeast of the intersection of Walnut Grove Avenue and Mission
Drive in Rosemead, California.
The project proposes to construct 37 residential units, including 29 single-family detached units and
8 duplex units as well as 17,298 square feet of open space area and 74 parking spaces on a 3.43-acre
site. The site is currently vacant. The project site is surrounded by existing single-family homes
immediately adjacent to the north and east, an existing church and single-family homes to the south
opposite Mission Drive, as well as vacant land and agricultural uses to the west. Existing single-
family homes are located to the west opposite the existing agricultural use and opposite Walnut
Grove Avenue. The project’s main entry will be from Mission Drive. Figures 1 and 2 show the project
location and site plan, respectively.
EXISTING LAND USES IN THE PROJECT AREA
The project site is surrounded primarily by residential uses and vacant parcels. The areas adjacent to
the project site include the following uses:
• North: Existing single-family residences;
• East: Existing single-family residences;
• South: Existing single-family residences and Sunrise House of Prayer opposite Mission Drive; and
• West: Existing single-family residences beyond agricultural and vacant land.
Project Location
SOURCE: ArcGIS Online Topographic Map (2020)
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FIGURE 1
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CARLOS VILLAGRAN/KAREN VILLAGRAN4613 BARTLETT AVEAPN: 5389-009-039
FENGYI J SITU/TRACY F SITU4607 BARTLETT AVEAPN: 5389-009-038
NGO & BANH FAMILY TRUSTNGO ALEXANDER D TR4603 BARTLETT AVEAPN: 5389-009-037
JASON SAM/FRAUSTINA SAM4549 BARTLETT AVEAPN: 5389-009-036
LAIRD ANDERSON/DONNA B ANDERSON4545 BARTLETT AVEAPN: 5389-009-035
BRYANT M TANG4539 BARTLETT AVEAPN: 5389-009-034
LENK TRUSTLENK JANET M TR4535 BARTLETT AVEAPN: 5389-009-033
KOKICHI NAKAZAWA/SUMIE NAKAZAWA4529 BARTLETT AVEAPN: 5389-009-032
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FIGURE 2
Site Plan
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NOISE AND VIBRATION FUNDAMENTALS
CHARACTERISTICS OF SOUND
Noise is usually defined as unwanted sound. Noise consists of any sound that may produce
physiological or psychological damage and/or interfere with communication, work, rest, recreation,
and sleep.
To the human ear, sound has two significant characteristics: pitch and loudness. Pitch is generally an
annoyance, while loudness can affect the ability to hear. Pitch is the number of complete vibrations,
or cycles per second, of a sound wave, which results in the tone’s range from high to low. Loudness
is the strength of a sound, and it describes a noisy or quiet environment; it is measured by the
amplitude of the sound wave. Loudness is determined by the intensity of the sound waves
combined with the reception characteristics of the human ear. Sound intensity is the average rate of
sound energy transmitted through a unit area perpendicular to the direction in which the sound
waves are traveling. This characteristic of sound can be precisely measured with instruments. The
analysis of a project defines the noise environment of the project area in terms of sound intensity
and its effect on adjacent sensitive land uses.
MEASUREMENT OF SOUND
Sound intensity is measured with the A-weighted decibel (dBA) scale to correct for the relative
frequency response of the human ear. That is, an A-weighted noise level de-emphasizes low and
very high frequencies of sound, similar to the human ear’s de-emphasis of these frequencies.
Decibels (dB), unlike the linear scale (e.g., inches or pounds), are measured on a logarithmic scale
representing points on a sharply rising curve.
For example, 10 dB is 10 times more intense than 0 dB, 20 dB is 100 times more intense than 0 dB,
and 30 dB is 1,000 times more intense than 0 dB. Thirty decibels (30 dB) represents 1,000 times as
much acoustic energy as 0 dB. The decibel scale increases as the square of the change, representing
the sound pressure energy. A sound as soft as human breathing is about 10 times greater than 0 dB.
The decibel system of measuring sound gives a rough connection between the physical intensity of
sound and its perceived loudness to the human ear. A 10 dB increase in sound level is perceived by
the human ear as only a doubling of the sound’s loudness. Ambient sounds generally range from
30 dB (very quiet) to 100 dB (very loud).
Sound levels are generated from a source, and their decibel level decreases as the distance from
that source increases. Sound levels dissipate exponentially with distance from their noise sources.
For a single point source, sound levels decrease approximately 6 dB for each doubling of distance
from the source. This drop-off rate is appropriate for noise generated by stationary equipment.
If noise is produced by a line source (e.g., highway traffic or railroad operations), the sound
decreases 3 dB for each doubling of distance in a hard site environment. Line-source sound levels
decrease 4.5 dB for each doubling of distance in a relatively flat environment with absorptive
vegetation.
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There are many ways to rate noise for various time periods, but an appropriate rating of ambient
noise affecting humans also accounts for the annoying effects of sound. The equivalent continuous
sound level (Leq) is the total sound energy of time-varying noise over a sample period. However, the
predominant rating scales for human communities in the State of California are the Leq and
Community Noise Equivalent Level (CNEL) or the day-night average noise level (Ldn) based on
A-weighted decibels. CNEL is the time-weighted average noise over a 24-hour period, with a
5 dBA weighting factor applied to the hourly Leq for noises occurring from 7:00 p.m. to 10:00 p.m.
(defined as relaxation hours) and a 10 dBA weighting factor applied to noises occurring from
10:00 p.m. to 7:00 a.m. (defined as sleeping hours). Ldn is similar to the CNEL scale but without the
adjustment for events occurring during relaxation hours. CNEL and Ldn are within 1 dBA of each
other and are normally interchangeable. The City uses the CNEL noise scale for long-term traffic
noise impact assessment.
Other noise rating scales of importance when assessing the annoyance factor include the maximum
instantaneous noise level (Lmax), which is the highest sound level that occurs during a stated time
period. The noise environments discussed in this analysis for short-term noise impacts are specified
in terms of maximum levels denoted by Lmax, which reflects peak operating conditions and addresses
the annoying aspects of intermittent noise. It is often used together with another noise scale, or
noise standards in terms of percentile noise levels, in noise ordinances for enforcement purposes.
For example, the L10 noise level represents the noise level exceeded 10 percent of the time during a
stated period. The L50 noise level represents the median noise level. Half the time the noise level
exceeds this level, and half the time it is less than this level. The L90 noise level represents the noise
level exceeded 90 percent of the time and is considered the background noise level during a
monitoring period. For a relatively constant noise source, the Leq and L50 are approximately the
same.
Noise impacts can be described in three categories. The first category includes audible impacts,
which are increases in noise levels noticeable to humans. Audible increases in noise levels generally
refer to a change of 3 dB or greater because this level has been found to be barely perceptible in
exterior environments. The second category, potentially audible, refers to a change in the noise
level between 1 dB and 3 dB. This range of noise levels has been found to be noticeable only in
laboratory environments. The last category includes changes in noise levels of less than 1 dB, which
are inaudible to the human ear. Only audible changes in existing ambient or background noise levels
are considered potentially significant.
Physiological Effects of Noise
Physical damage to human hearing begins at prolonged exposure to sound levels higher than
85 dBA. Exposure to high sound levels affects the entire system, with prolonged sound exposure in
excess of 75 dBA increasing body tensions, thereby affecting blood pressure and functions of the
heart and the nervous system. In comparison, extended periods of sound exposure above
90 dBA would result in permanent cell damage. When the sound level reaches 120 dBA, a tickling
sensation occurs in the human ear, even with short-term exposure. This level of sound is called the
threshold of feeling. As the sound reaches 140 dBA, the tickling sensation is replaced by a feeling of
pain in the ear (i.e., the threshold of pain). A sound level of 160–165 dBA will result in dizziness or a
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loss of equilibrium. The ambient or background noise problem is widespread and generally more
concentrated in urban areas than in outlying, less developed areas.
Table A lists definitions of acoustical terms, and Table B shows common sound levels and their
sources.
Table A: Definitions of Acoustical Terms
Term Definitions
Decibel, dB A unit of sound measurement that denotes the ratio between two quantities that are
proportional to power; the number of decibels is 10 times the logarithm (to the base 10) of this
ratio.
Frequency, Hz Of a function periodic in time, the number of times that the quantity repeats itself in 1 second
(i.e., the number of cycles per second).
A-Weighted Sound
Level, dBA
The sound level obtained by use of A-weighting. The A-weighting filter de-emphasizes the very
low and very high frequency components of the sound in a manner similar to the frequency
response of the human ear and correlates well with subjective reactions to noise. (All sound
levels in this report are A-weighted unless reported otherwise.)
L01, L10, L50, L90 The fast A-weighted noise levels that are equaled or exceeded by a fluctuating sound level 1%,
10%, 50%, and 90% of a stated time period, respectively.
Equivalent
Continuous Noise
Level, Leq
The level of a steady sound that, in a stated time period and at a stated location, has the same
A-weighted sound energy as the time-varying sound.
Community Noise
Equivalent Level,
CNEL
The 24-hour A-weighted average sound level from midnight to midnight, obtained after the
addition of 5 dBA to sound levels occurring in the evening from 7:00 p.m. to 10:00 p.m. and
after the addition of 10 dBA to sound levels occurring in the night between 10:00 p.m. and
7:00 a.m.
Day/Night Noise
Level, Ldn
The 24-hour A-weighted average sound level from midnight to midnight, obtained after the
addition of 10 dBA to sound levels occurring in the night between 10:00 p.m. and 7:00 a.m.
Lmax, Lmin The maximum and minimum A-weighted sound levels measured on a sound level meter,
during a designated time interval, using fast time averaging.
Ambient Noise Level The all-encompassing noise associated with a given environment at a specified time. Usually a composite of sound from many sources from many directions, near and far; no particular
sound is dominant.
Intrusive The noise that intrudes over and above the existing ambient noise at a given location. The
relative intrusiveness of a sound depends upon its amplitude, duration, frequency, time of
occurrence, and tonal or informational content, as well as the prevailing ambient noise level.
Source: Handbook of Acoustical Measurements and Noise Control (Harris 1991).
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Table B: Common Sound Levels and Their Noise Sources
Noise Source A-Weighted Sound Level in Decibels Noise Environments Subjective Evaluations
Near Jet Engine 140 Deafening 128 times as loud
Civil Defense Siren 130 Threshold of Pain 64 times as loud
Hard Rock Band 120 Threshold of Feeling 32 times as loud
Accelerating Motorcycle at a Few Feet Away 110 Very Loud 16 times as loud
Pile Driver; Noisy Urban Street/Heavy City
Traffic
100 Very Loud 8 times as loud
Ambulance Siren; Food Blender 95 Very Loud —
Garbage Disposal 90 Very Loud 4 times as loud
Freight Cars; Living Room Music 85 Loud —
Pneumatic Drill; Vacuum Cleaner 80 Loud 2 times as loud
Busy Restaurant 75 Moderately Loud —
Near Freeway Auto Traffic 70 Moderately Loud Reference level
Average Office 60 Quiet One-half as loud
Suburban Street 55 Quiet —
Light Traffic; Soft Radio Music in Apartment 50 Quiet One-quarter as loud
Large Transformer 45 Quiet —
Average Residence without Stereo Playing 40 Faint One-eighth as loud
Soft Whisper 30 Faint —
Rustling Leaves 20 Very Faint —
Human Breathing 10 Very Faint Threshold of Hearing
— 0 Very Faint —
Source: Compiled by LSA (2022).
FUNDAMENTALS OF VIBRATION
Vibration refers to ground-borne noise and perceptible motion. Ground-borne vibration is almost
exclusively a concern inside buildings and is rarely perceived as a problem outdoors, where the
motion may be discernible, but without the effects associated with the shaking of a building there is
less adverse reaction. Vibration energy propagates from a source through intervening soil and rock
layers to the foundations of nearby buildings. The vibration then propagates from the foundation
throughout the remainder of the structure. Building vibration may be perceived by occupants as the
motion of building surfaces, the rattling of items sitting on shelves or hanging on walls, or a low-
frequency rumbling noise. The rumbling noise is caused by the vibration of walls, floors, and ceilings
that radiate sound waves. Annoyance from vibration often occurs when the vibration exceeds the
threshold of perception by 10 dB or less. This is an order of magnitude below the damage threshold
for normal buildings.
Typical sources of ground-borne vibration are construction activities (e.g., blasting, pile-driving, and
operating heavy-duty earthmoving equipment), steel-wheeled trains, and occasional traffic on rough
roads. Problems with both ground-borne vibration and noise from these sources are usually
localized to areas within approximately 100 feet (ft) from the vibration source, although there are
examples of ground-borne vibration causing interference out to distances greater than 200 ft .
When roadways are smooth, vibration from traffic, even heavy trucks, is rarely perceptible. It is
assumed for most projects that the roadway surface will be smooth enough that ground-borne
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vibration from street traffic will not exceed the impact criteria; however, construction of the project
could result in ground-borne vibration that may be perceptible and annoying.
Ground-borne noise is not likely to be a problem because noise arriving via the normal airborne path
will usually be greater than ground-borne noise.
Ground-borne vibration has the potential to disturb people and damage buildings. Although it is
very rare for train-induced ground-borne vibration to cause even cosmetic building damage, it is not
uncommon for construction processes such as blasting and pile-driving to cause vibration of
sufficient amplitudes to damage nearby buildings. Ground-borne vibration is usually measured in
terms of vibration velocity, either the root-mean-square (RMS) velocity or peak particle velocity
(PPV). The RMS is best for characterizing human response to building vibration, and PPV is used to
characterize the potential for damage. Decibel notation acts to compress the range of numbers
required to describe vibration. Vibration velocity level in decibels is defined as:
Lv = 20 log10 [V/Vref]
where “Lv” is the vibration velocity in decibels (VdB), “V” is the RMS velocity amplitude, and “Vref” is
the reference velocity amplitude, or 1 x 10-6 inches/second (in/sec) used in the United States.
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REGULATORY SETTING
APPLICABLE NOISE STANDARDS
The applicable noise standards governing the project site include the criteria in the California Code
of Regulations, the Noise Element of the City’s General Plan (Noise Element), and the City of
Rosemead Municipal Code.
California Code of Regulations
Interior noise levels for residential habitable rooms are regulated by Title 24 of the California Code
of Regulations California Noise Insulation Standards. Title 24, Chapter 12, Section 1206.4, of the
2019 California Building Code requires that interior noise levels attributable to exterior sources not
exceed 45 CNEL in any habitable room. A habitable room is a room used for living, sleeping, eating,
or cooking. Bathrooms, closets, hallways, utility spaces, and similar areas are not considered
habitable rooms for this regulation (Title 24 California Code of Regulations, Chapter 12, Section
1206.4).
City of Rosemead
Noise Element of the General Plan
The City of Rosemead General Plan addresses noise in its Noise Element (General Plan 2010). The
Noise Element contains goals and policies for noise control and abatement in the City. General noise
goals for Rosemead aim to attain a healthier and quieter environment for all citizens while
maintaining a reasonable level of economic progress and development.
The City, consistent with the California Office of Planning and Research, has established land use
compatibility guidelines for determining acceptable noise levels for specified land uses as shown in
Table C. These land use compatibility guidelines are intended to be an advisory resource when
considering changes in land use and policies, such as zoning modifications.
The Issues, Goals, and Policies as well as the Implementation Actions in the City’s General Plan Noise
Element are designed to provide noise-compatible land use relationships by establishing noise
standards utilized for design and siting purposes and minimize noise impacts from significant noise
generators. The following goals and policies are applicable to the proposed project:
Issues, Goal, and Policies
• Goal 1: Effective incorporation of noise considerations into land use planning decisions.
○ Policy 1.1: Ensure compliance with standards for interior and exterior noise established
within the Noise Element and Zoning Code.
○ Policy 1.4: Encourage acoustical design in new construction
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Table C: Noise/Land Use Compatibility Matrix
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○ Policy 1.5: Require sound walls to be constructed in designated mixed-use districts where
noise-sensitive land uses are located on adjacent properties.
Goal 3: Effective implementation of measures to control non-transportation noise impacts.
○ Policy 3.1: Enforce provisions of the Community Noise Ordinance to mitigate noise conflicts.
○ Policy 3.2: Require that potential sources of noise be considered when approving new
development to reduce the possibility of adverse affects.
○ Policy 3.3: Evaluate noise generated by construction activities to ensure compliance with
the Community Noise Ordinance.
○ Policy 3.4: Establish and maintain coordination among the City departments involved in
noise abatement.
Implementation Actions
• Goal 1: Effective incorporation of noise considerations into land use planning decisions.
○ Action 1.2: Incorporate noise reduction features during site planning to mitigate anticipated
noise impacts on affected noise sensitive land uses. The noise contours, illustrated on the
Existing Noise Contours Map, identify areas within the City exposed to noise levels greater
than 60dB CNEL and shall be used to identify locations of potential conflict. Require
acoustical analyses, as appropriate, for proposed residential development within the 60 dB
CNEL or higher contour. New developments will be permitted only if appropriate mitigation
measures are included.
○ Action 1.3: Enforce provisions of the California Noise Insulation Standards (Title 24) that
specify that indoor noise levels for multi-family residential living spaces shall not exceed 45
dB CNEL. The standard is defined as the combined effect of all noise sources, and is
implemented when existing or future exterior noise levels exceed 60 dB CNEL. Title 24
further requires that the standard be applied to all new hotels, motels, apartment houses,
and dwellings other than detached single-family dwellings. The City will additionally apply
the standard to single-family dwellings and condominium conversion projects.
City of Rosemead Municipal Code
Section 8.36.030 of the City’s Municipal Code limits construction and demolition activities to
between the hours of 7:00 a.m. and 8:00 p.m. on weekdays, including Saturday. Construction
activities should not take place at any time on Sunday or a federal holiday. No person shall operate
or allow the operation of any tools or equipment used in construction, drilling, repair, or alteration
or demolition work outside of these hours to prevent noise disturbances.
Section 8.36.060 of the City’s Municipal Code, Noise Standards, establishes limits on non-impulsive
noise where no person shall maintain, create, operate, or cause noise on private property to not
exceed the noise standards shown in Table D. The standards are applicable to all receptor properties
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within a designated noise zone. This section also establishes an allowable interior noise level of 45
dBA at all residential receptors during anytime of the day.
Table D: Maximum Sound Levels for Source Land Uses
Noise Zone Type of Land Use (Receptor Property) Time Interval Allowable Exterior Noise Level (dBA)
I
Single-,double-or
multiple family
residential
Daytime1 60
Nighttime2 45
II Commercial Daytime1 65
Nighttime2 60
III Industrial or manufacturing Anytime 70
Source: Section 8.36.060(A) of the City of Rosemead Municipal Code (2021).
1 Daytime means 7:00 a.m. to 10:00 p.m.
2 Nighttime means 10:01 p.m. to 6:59 a.m. dBA = A-weighted decibels
Leq = equivalent continuous sound level
Federal Transit Administration
Although the City does not have daytime construction noise level limits for activities that occur
within the specified hours in Section 11.80.030(D)(7) to determine potential California
Environmental Quality Act (CEQA) noise impacts, construction noise was assessed using criteria from
the Transit Noise and Vibration Impact Assessment Manual (FTA 2018) (FTA Manual). Table E shows
the FTA’s General Assessment Construction Noise Criteria based on the composite noise levels per
construction phase.
Table E: General Assessment Construction Noise Criteria
Land Use Daytime 1-hour Leq (dBA) Nighttime 1-hour Leq (dBA)
Residential 90 80
Commercial 100 100
Industrial 100 100
Source: Transit Noise and Vibration Impact Assessment Manual (FTA 2018).
dBA = A-weighted decibels Leq = equivalent continuous sound level
APPLICABLE VIBRATION STANDARDS
Given the City of Rosemead has not established its own vibration impact criteria, the following
information provides standards to which potential vibration impacts will be compared. Vibration
standards included in the FTA Manual are used in this analysis for ground-borne vibration impacts
on human annoyance and potential damage.
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Federal Transit Administration
Table F provides the criteria for assessing the potential for interference or annoyance from vibration
levels in a building. The criteria for annoyance impacts resulting from ground-borne vibration and
noise are based on the average vibration levels during construction. Table G provides the criteria for
assessing the potential for damage from vibration levels generated during construction to
surrounding structures. The criteria for annoyance impacts resulting from ground-borne vibration
and noise are based on the maximum vibration levels during construction at the project property
Table F: Interpretation of Vibration Criteria for Detailed Analysis
Land Use Max Lv (VdB)1 Description of Use
Workshop 90 Vibration that is distinctly felt. Appropriate for workshops and similar areas
not as sensitive to vibration.
Office 84 Vibration that can be felt. Appropriate for offices and similar areas not as
sensitive to vibration.
Residential Day 78 Vibration that is barely felt. Adequate for computer equipment and low-
power optical microscopes (up to 20×).
Residential Night and
Operating Rooms 72
Vibration is not felt, but ground-borne noise may be audible inside quiet
rooms. Suitable for medium-power microscopes (100×) and other equipment
of low sensitivity.
Source: Transit Noise and Vibration Impact Assessment Manual (FTA 2018).
1 As measured in 1/3-octave bands of frequency over a frequency range of 8 to 80 Hertz.
FTA = Federal Transit Administration
LV = velocity in decibels
Max = maximum
VdB = vibration velocity decibels
Table G: Construction Vibration Damage Criteria
Building Category PPV (in/sec)
Reinforced concrete, steel, or timber (no plaster) 0.50
Engineered concrete and masonry (no plaster) 0.30
Non-engineered timber and masonry buildings 0.20
Buildings extremely susceptible to vibration damage 0.12
Source: Transit Noise and Vibration Impact Assessment Manual (FTA 2018).
FTA = Federal Transit Administration in/sec = inch/inches per second PPV = peak particle velocity
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OVERVIEW OF THE EXISTING NOISE ENVIRONMENT
The primary existing noise sources in the project area are transportation facilities. Traffic on Mission
Drive and Walnut Grove Avenue are a steady source of ambient noise.
AMBIENT NOISE MEASUREMENTS
Long-Term Noise Measurements
Two long-term (24-hour) noise level measurements were conducted on June 21 through June 22,
2022, using two Larson Davis Spark 706RC Dosimeters, and one short term measurement using a
Larson Davis 831 Sound Level Meter. Table H provides a summary of the measured hourly noise
levels from the noise level measurements. Hourly noise levels at surrounding sensitive uses are as
low as 37.3 dBA Leq during nighttime hours and 43.0 dBA Leq during daytime hours. Noise monitoring
data results are provided in Appendix A. Figure 3 shows the noise monitoring locations.
Table H: Existing Noise Level Measurements
Location Location Description
Daytime Noise Levels1 (dBA Leq)
Evening Noise Levels2 (dBA Leq)
Nighttime Noise Levels3 (dBA Leq)
Average
Daily Noise
Levels
(dBA CNEL)
LT-1 Southern corner of project site, on a fence along the backyard of 8623 Mission Drive 50.9 – 62.5 49.2 – 56.1 42.6 – 52.1 57.0
LT-2
Western corner of project site,
bordering a power line near a fence
next to a power line tower.
47.6 – 59.8 45.4 – 54.3 41.9 – 50.7 55.2
ST-14 Northeast corner of project site,
south of 8612 Zerelda Street 43.0 – 55.2 40.8 – 49.7 37.3 – 46.1 50.6
Source: Compiled by LSA (August 2022).
1 Daytime Noise Levels = noise levels during the hours of 7:00 a.m. to 7:00 p.m.
2 Evening Noise Levels = noise levels during the hours of 7:00 p.m. to 10:00 p.m.
3 Nighttime Noise Levels = noise levels during the hours of 10:00 p.m. to 7:00 a.m.
4 Short-term measurement data estimated based on corresponding long-term dBA = A-weighted decibels ft = foot/feet CNELLdn = Day-night Level
Leq = equivalent continuous sound level
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EXISTING AIRCRAFT NOISE
Airport-related noise levels are primarily associated with aircraft engine noise made while aircraft
are taking off, landing, or running their engines while still on the ground. The closest airport to the
proposed project site is San Gabriel Valley Airport (EMT), formerly known as El Monte Airport,
located approximately 2.6 miles (mi) east of the project site. Based on the Airport’s Master Plan
report (1995), the project is located well outside of the 60 dBA CNEL noise contour of the airport.
Therefore, the project site is not expected to experience airport-related noise levels in excess of the
City of Rosemead exterior standards. No further analysis is necessary.
SOURCE: Google Earth 2021
I:\ESL2201.32\G\Noise_Locs.ai (8/3/22)
FIGURE 3
Mission Villas Project
Noise Monitoring LocaƟons
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LEGEND
- Project Site Boundary
- Short-Term Noise Monitoring LocaƟon
- Long-Term Noise Monitoring LocaƟonLLT-1-1
ST-1-1
LT-1
ST-1
ST-1-1ST-1
LT-1-1LT-1
LT-2-2LT-2
Miss
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D
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Misson Dr BartleƩ AveBartleƩ AveWa
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PROJECT IMPACT ANALYSIS
SHORT-TERM CONSTRUCTION NOISE IMPACTS
Two types of short-term noise impacts could occur during the construction of the proposed project.
First, construction crew commutes and the transport of construction equipment and materials to
the site for the proposed project would incrementally increase noise levels on access roads leading
to the site. Although there would be a relatively high single-event noise-exposure potential causing
intermittent noise nuisance (passing trucks at 50 ft would generate up to 84 dBA Lmax), the effect on
longer-term ambient noise levels would be small when compared to existing daily traffic volumes on
Mission Drive. Because construction-related vehicle trips would not approach existing daily traffic
volumes, traffic noise would not increase by 3 dBA CNEL. A noise level increase of less than 3 dBA
would not be perceptible to the human ear in an outdoor environment. Therefore, short-term,
construction-related impacts associated with worker commute and equipment transport to the
project site would be less than significant.
The second type of short-term noise impact is related to noise generated during construction, which
includes demolition, site preparation, grading, building construction, paving, and architectural
coating on the project site. Construction is completed in discrete steps, each of which has its own
mix of equipment and, consequently, its own noise characteristics. These various sequential phases
would change the character of the noise generated on the site and, therefore, the noise levels
surrounding the site as construction progresses. Despite the variety in the type and size of
construction equipment, similarities in the dominant noise sources and patterns of operation allow
construction-related noise ranges to be categorized by work phase. Table I lists typical construction
equipment noise levels recommended for noise impact assessments, based on a distance of 50 ft
between the equipment and a noise receptor, taken from the Federal Highway Administration
(FHWA) Roadway Construction Noise Model (FHWA 2006).
In addition to the reference maximum noise level, the usage factor provided in Table I is used to
calculate the hourly noise level impact for each piece of equipment based on the following
equation:
−+=50log20.).log(10..)(DFULEequipLeq
where: Leq (equip) = Leq at a receiver resulting from the operation of a single
piece of equipment over a specified time period.
E.L. = noise emission level of the particular piece of equipment at
a reference distance of 50 ft.
U.F. = usage factor that accounts for the fraction of time that the
equipment is in use over the specified period of time.
D = distance from the receiver to the piece of equipment.
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Table I: Typical Construction Equipment Noise Levels
Equipment Description Acoustical Usage Factor (%)1 Maximum Noise Level (Lmax) at 50 Feet2
Auger Drill Rig 20 84
Backhoes 40 80
Compactor (ground) 20 80
Compressor 40 80
Cranes 16 85
Dozers 40 85
Dump Trucks 40 84
Excavators 40 85
Flat Bed Trucks 40 84
Forklift 20 85
Front-end Loaders 40 80
Graders 40 85
Impact Pile Drivers 20 95
Jackhammers 20 85
Paver 50 77
Pickup Truck 40 55
Pneumatic Tools 50 85
Pumps 50 77
Rock Drills 20 85
Rollers 20 85
Scrapers 40 85
Tractors 40 84
Trencher 50 80
Welder 40 73
Source: FHWA Roadway Construction Noise Model User’s Guide, Table 1 (FHWA 2006). Note: Noise levels reported in this table are rounded to the nearest whole number.
1 Usage factor is the percentage of time during a construction noise operation that a piece of construction equipment is operating at full power.
2 Maximum noise levels were developed based on Specification 721.560 from the Central Artery/
Tunnel program to be consistent with the City of Boston’s Noise Code for the “Big Dig” project. FHWA = Federal Highway Administration Lmax = maximum instantaneous sound level
Each piece of construction equipment operates as an individual point source. Using the following
equation, a composite noise level can be calculated when multiple sources of noise operate
simultaneously:
𝐿𝐿𝐿𝐿𝐿𝐿 (𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝐿𝐿)=10 ∗log10 ��10𝐿𝐿𝐿𝐿10𝐿𝐿
1 �
Using the equations from the methodology above, the reference information in Table I, and the
construction equipment list provided, the composite noise level of each construction phase was
calculated. The project construction composite noise levels at a distance of 50 feet would range
from 74 dBA Leq to 88 dBA Leq, with the highest noise levels occurring during the site preparation and
paving phases.
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Once composite noise levels are calculated, reference noise levels can then be adjusted for distance
using the following equation: 𝐿𝐿𝐿𝐿𝐿𝐿 (𝑎𝑎𝑐𝑐 𝑑𝑑𝑐𝑐𝑐𝑐𝑐𝑐𝑎𝑎𝑑𝑑𝑐𝑐𝐿𝐿 𝑋𝑋)=𝐿𝐿𝐿𝐿𝐿𝐿 (𝑎𝑎𝑐𝑐 50 𝑓𝑓𝐿𝐿𝐿𝐿𝑐𝑐)−20 ∗lo g10 �𝑋𝑋50�
In general, this equation shows that doubling the distance would decrease noise levels by 6 dBA,
while halving the distance would increase noise levels by 6 dBA.
Table J shows the nearest sensitive uses to the project site, their distance from the center of
construction activities, and composite noise levels expected during construction. These noise level
projections do not consider intervening topography or barriers. Construction equipment calculations
are provided in Appendix B.
Table J: Potential Construction Noise Impacts at Nearest Receptor
Receptor
(Location)
Composite Noise Level
(dBA Leq) at 50 feet1 Distance (feet) Composite Noise
Level (dBA Leq)
Residences (East)
88
115 81
Residences (West) 350 71
Residences (North) 350 71
Residences (South) 430 69
Source: Compiled by LSA (2022).
1 The composite construction noise level represents the paving/site preparation phases, which are
expected to result in the greatest noise level as compared to other phases.
dBA = A-weighted decibels Leq = equivalent continuous sound level
While construction noise will vary, it is expected that composite noise levels during construction at
the nearest off-site sensitive residential use to the east would reach an average noise level of
81 dBA Leq during daytime hours. These predicted noise levels would only occur when all
construction equipment is operating simultaneously and, therefore, are assumed to be rather
conservative in nature. While construction-related short-term noise levels have the potential to be
higher than existing ambient noise levels in the project area under existing conditions, the noise
impacts would no longer occur once project construction is completed.
As stated above, construction activities are regulated by the City’s Noise Ordinance. The proposed
project would comply with the construction hours specified in the City’s Noise Ordinance, which
states that construction activities are allowed between the hours of 7:00 a.m. to 8:00 p.m., Monday
through Saturday, excluding Sunday and holidays.
As it relates to off-site uses, construction-related noise levels would remain below the daytime
90 dBA Leq 1-hour construction noise level criteria established by the FTA for residential and similar
sensitive uses and, therefore, would be considered less than significant. Best construction practices
presented at the end of this analysis shall be implemented to minimize noise impacts to surrounding
receptors.
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SHORT-TERM CONSTRUCTION VIBRATION IMPACTS
This construction vibration impact analysis discusses the level of human annoyance using vibration
levels in VdB and assesses the potential for building damages using vibration levels in PPV (in/sec).
This is because vibration levels calculated in RMS are best for characterizing human response to
building vibration, while calculating vibration levels in PPV is best for characterizing the potential for
damage.
Table K shows the PPV and VdB values at 25 ft from the construction vibration source. As shown in
Table K, bulldozers and other heavy-tracked construction equipment (expected to be used for this
project) generate approximately 0.089 PPV in/sec or 87 VdB of ground-borne vibration when
measured at 25 ft, based on the FTA Manual. The distance to the nearest buildings for vibration
impact analysis is measured between the nearest off-site buildings and the project construction
boundary (assuming the construction equipment would be used at or near the project setback line).
Table K: Vibration Source Amplitudes for Construction
Equipment
Equipment Reference PPV/LV at 25 ft
PPV (in/sec) LV (VdB)1
Pile Driver (Impact), Typical 0.644 104
Pile Driver (Sonic), Typical 0.170 93
Vibratory Roller 0.210 94
Hoe Ram 0.089 87
Large Bulldozer2 0.089 87
Caisson Drilling 0.089 87
Loaded Trucks2 0.076 86
Jackhammer 0.035 79
Small Bulldozer 0.003 58
Source: Transit Noise and Vibration Impact Assessment Manual (FTA 2018).
1 RMS vibration velocity in decibels (VdB) is 1 µin/sec.
2 Equipment shown in bold is expected to be used on site. µin/sec = microinches per second ft = foot/feet
FTA = Federal Transit Administration
in/sec = inch/inches per second
LV = velocity in decibels PPV = peak particle velocity
RMS = root-mean-square
VdB = vibration velocity decibels
The formulae for vibration transmission are provided below, and Tables L and M provide a summary
of off-site construction vibration levels.
LvdB (D) = LvdB (25 ft) – 30 Log (D/25)
PPVequip = PPVref x (25/D)1.5
As shown in Table F, above, the threshold at which vibration levels would result in annoyance would
be 78 VdB for daytime residential uses. As shown in Table G, the FTA guidelines indicate that for a
non-engineered timber and masonry building, the construction vibration damage criterion is
0.2 in/sec in PPV.
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Table L: Potential Construction Vibration Annoyance Impacts at
Nearest Receptor
Receptor (Location) Reference Vibration
Level (VdB) at 25 ft1 Distance (ft) 2 Vibration Level
(VdB)
Residences (East)
87
115 67
Residences (West) 360 52
Residences (North) 360 52
Residences (South) 430 50
Source: Compiled by LSA (2022).
1 The reference vibration level is associated with a large bulldozer, which is expected to be
representative of the heavy equipment used during construction.
2 The reference distance is associated with the average condition, identified by the distance from the center of construction activities to surrounding uses. ft = foot/feet
VdB = vibration velocity decibels
Table M: Potential Construction Vibration Damage Impacts
at Nearest Receptor
Receptor
(Location)
Reference
Vibration Level
(PPV) at 25 ft1
Distance (ft)2
Vibration
Level
(PPV)
Residences (East)
0.089
5 0.995
Residences (West) 250 0.352
Residences (North) 10 0.003
Residences (South) 100 0.011
Source: Compiled by LSA (2022).
1 The reference vibration level is associated with a large bulldozer, which is expected to be
representative of the heavy equipment used during construction.
2 The reference distance is associated with the peak condition, identified by the distance
from the perimeter of construction activities to surrounding structures. ft = foot/feet PPV = peak particle velocity
Based on the information provided in Table L, vibration levels are expected to approach 67 VdB at
the closest residential uses located immediately east of the project site, which is below the 78 VdB
threshold for annoyance.
The closest structure to the project site is the residential uses to the east of site, approximately 5 ft
from the limits of construction activity. It is expected that vibration levels generated by dump trucks
and other large equipment that would be as close as 5 feet from the property line would generate
ground-borne vibration levels of up to 0.995 PPV (in/sec) at the closest structure to the project site.
This vibration level would exceed the 0.2 PPV (in/sec) threshold considered safe for non-engineered
timber and masonry buildings. It is expected that construction activities utilizing heavy equipment
would generate vibration levels greater than 0.2 in/sec in PPV when operating within 10 feet of the
property line, which would result in a potentially significant impact. Therefore, the use of heavy
equipment should be prohibited within 15 feet of existing structures to ensure that vibration levels
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are below the 0.2 PPV (in/sec) threshold. At 15 feet, dump trucks and other large equipment would
generate ground-borne vibrations levels of up to 0.191 PPV (in/sec) at the closest structure to the
project site and would not exceed the 0.2 PPV (in/sec) threshold. If heavy equipment is necessary
within 15 feet of the east boundary of the project site, further vibration assessments as presented in
mitigation measures (Mitigation Measure NOI-1) would be implemented to reduce potential
impacts. Therefore, construction would not result in any vibration damage and impacts would be
less than significant with the incorporation of Mitigation Measure NOI-1.
Mitigation Measure NOI-1 Construction Vibration Damage. Due to the close proximity to
surrounding structures, the City of Rosemead (City) Director of
Community Development, or designee, shall verify prior to issuance
of demolition or grading permits, that the approved plans require
that the construction contractor shall implement the following
measures during project construction activities to ensure that
damage does not occur at surrounding structures:
The use of heavy equipment shall be prohibited within 15 feet
of existing structures. If heavy equipment is necessary within
15 feet of existing structures, the following measures shall be
implemented:
Identify structures that could be affected by ground-borne
vibration and would be located within 15 feet of where
heavy construction equipment would be used. This task
shall be conducted by a qualified structural engineer as
approved by the City’s Director of Community Development
or designee.
Develop a vibration monitoring and construction
contingency plan for approval by the City’s Director of
Community Development, or designee, to identify
structures where monitoring would be conducted; set up a
vibration monitoring schedule; define structure-specific
vibration limits; and address the need to conduct photo,
elevation, and crack surveys to document before and after
construction conditions. Construction contingencies would
be identified for when vibration levels approached the
limits.
At a minimum, monitor vibration during initial demolition
activities. Monitoring results may indicate the need for
more intensive measurements if vibration levels approach
the 0.2 PPV (in/sec) threshold.
When vibration levels approach the 0.2 PPV (in/sec) limit,
suspend construction and implement contingencies as
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identified in the approved vibration monitoring and
construction contingency plan to either lower vibration
levels or secure the affected structures.
Implementation of Mitigation Measure NOI-1 would reduce impacts to a less than significant level
by prohibiting heavy equipment within 15 feet of existing structures or requiring a vibration
monitoring plan that would ensure that vibration levels are below the 0.2 PPV (in/sec) and vibration
damage would not occur. Therefore, vibration impacts would be less than significant with
mitigation. Because construction activities are regulated by the City’s Municipal Code, which states
that construction, maintenance, or demolition activities are not allowed between the hours of 8:00
p.m. and 7:00 a.m. on weekdays, including Saturdays, or at any time on Sundays and federal
holidays, vibration impacts would not occur during the more sensitive nighttime hours.
LONG-TERM OFF-SITE TRAFFIC NOISE IMPACTS
In order to assess the potential traffic impacts related to the proposed project, a Trip Generation
and Vehicle Miles Traveled (VMT) Screening Analysis (EPD Solutions, Inc. 2022) has been prepared.
Based on the analysis results, it was determined that a net additional 349 average daily trips (ADT)
would be generated by the proposed project. The expected traffic volume on the adjacent segment
of Mission Drive could be as low as 15,000 (City of Rosemead General Plan 2010). The following
equation was used to determine the potential impacts of the project:
Change in CNEL = 10 𝑙𝑙𝑐𝑐𝑙𝑙10�𝑉𝑉𝑒𝑒+𝑝𝑝/𝑉𝑉𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝐿𝐿𝑒𝑒�
where: Vexisting = existing daily volumes
Ve+p = existing daily volumes plus project
Change in CNEL = increase in noise level due to the project
The results of the calculations show that an increase of approximately 0.1 dBA CNEL is expected
along the streets adjacent to the project site. A noise level increase of less than 1 dBA would not be
perceptible to the human ear; therefore, the traffic noise increase in the vicinity of the project site
resulting from the proposed project would be less than significant. No mitigation is required.
LONG-TERM TRAFFIC-RELATED VIBRATION IMPACTS
The proposed project would not generate vibration levels related to on-site operations. In addition,
vibration levels generated from project-related traffic on the adjacent roadways are unusual for
on-road vehicles because the rubber tires and suspension systems of on-road vehicles provide
vibration isolation. Vibration levels generated from project-related traffic on the adjacent roadways
would be less than significant, and no mitigation measures are required.
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BEST CONSTRUCTION PRACTICES
In addition to compliance with the City’s Municipal Code allowed hours of construction of 7:00 a.m.
to 8:00 p.m., Monday through Saturday, excluding Sunday and holidays, the following
recommendations would reduce construction noise to the extent feasible:
•The project construction contractor should equip all construction equipment, fixed or mobile,
with properly operating and maintained noise mufflers, consistent with manufacturer’s
standards.
•The project construction contractor should locate staging areas away from off-site sensitive uses
during the later phases of project development.
•The project construction contractor should place all stationary construction equipment so that
emitted noise is directed away from sensitive receptors nearest the project site whenever
feasible.
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LAND USE COMPATIBILITY
The dominant source of noise in the project vicinity is traffic noise from roadways in the vicinity of
the project.
EXTERIOR NOISE ASSESSMENT
Based on the monitoring results shown in Table H, the existing measured noise levels at the project
site closest to Mission Drive, approximately 95 feet away from Mission Drive centerline, is 57.0 dBA
CNEL. Based on the project site plan, the rear yards of units 1-4 and 37 are approximately 45 feet
away from Mission Drive centerline, resulting in estimated noise levels approaching 62 dBA, without
accounting for shielding provided by the proposed 6ft wall, which would reduce the noise levels by 5
dBA or more, resulting in noise levels below 60 dBA. This level is below the City’s 60 dBA CNEL
exterior noise level standard. Therefore, no additional mitigation would be required.
INTERIOR NOISE ASSESSMENT
As discussed above, per the California Code of Regulations and the City’s Implementation Actions,
an interior noise level standard of 45 dBA CNEL or less is required for all noise-sensitive rooms.
Based on the expected future exterior noise levels at the façades of the lots closest to Mission Drive
approaching 62 dBA CNEL, a minimum noise reduction of 17 dBA would be required.
Based on reference information from transmission loss test reports for various Milgard windows
(Milgard 2008), standard building construction along with standard windows, typically in the STC 25-
28 range, a reduction of 25 dBA or more would be achieved with windows in a closed position. With
a reduction of 25 dBA or more, interior noise levels would remain below the City’s interior noise
level standard of 45 dBA CNEL. The project includes a HVAC system for all unit so that windows can
remained closed.
Once final plans are available to detail the exterior wall construction and a window manufacturer
has been chosen, a Final Acoustical Report (FAR) would be required to confirm the reduction
capability of the exterior façades and to identify any specific upgrades necessary to achieve an
interior noise level of 45 dBA CNEL or below.
NOISE AND VIBRATION IMPACT ANALYSIS AUGUST 2022 MISSION VILLAS ROSEMEAD, CALIFORNIA
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REFERENCES
City of Rosemead. 2010. General Plan Noise Element. April 13.
–––––. 2021. Municipal Code. Website:
https://library.municode.com/ca/rosemead/codes/code_of_ordinances (accessed July
2022). December 2.
County of Los Angeles. El Monte Airport Master Plan Report. 1995. June.
EPD Solutions, Inc. 2022. Trip Generation and Vehicle Miles Traveled (VMT) Screening Analysis for
8601 Mission Drive. January 21.
Federal Highway Administration (FHWA). 2006. Roadway Construction Noise Model User’s Guide.
January. Washington, D.C. Website: www.fhwa.dot.gov/environment/noise/construction_
noise/rcnm/rcnm.pdf (accessed March 2022).
Federal Transit Administration (FTA). 2018. Transit Noise and Vibration Impact Assessment Manual.
Office of Planning and Environment. Report No. 0123. September.
Harris, Cyril M., editor. 1991. Handbook of Acoustical Measurements and Noise Control.
Third Edition.
Milgard. 2008. Various Transmission Loss Reports.
State of California. 2020. 2019 California Green Building Standards Code.
United States Environmental Protection Agency. 1978. Protective Noise Levels, Condensed Version of
EPA Levels Document, EPA 550/9-79-100. November.
NOISE AND VIBRATION IMPACT ANALYSIS AUGUST 2022 MISSION VILLAS ROSEMEAD, CALIFORNIA
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APPENDIX A
NOISE MONITORING DATA
Noise Measurement Survey – 24 HR
Project Number: ESL2201.32 Test Personnel: Kevin Nguyendo
Project Name: Mission Villas Equipment: Spark 706RC (SN:18905) Site Number: LT-1 Date: 6/21/2022 Time: From 11:00 a.m. To 11:00 a.m.
Site Location: Southern corner on a fence along the backyard of 8623 Mission Dr, Rosemead,
CA 91770. Primary Noise Sources: Regular traffic noise on Mission Drive.
Comments: On a chain link fence all around.
Photo:
Long-Term (24-Hour) Noise Level Measurement Results at LT-1
Start Time Date Noise Level (dBA) Leq Lmax Lmin
11:00 AM 6/21/22 51.5 71.5 40.1
12:00 PM 6/21/22 50.9 62.6 39.5
1:00 PM 6/21/22 51.7 66.0 41.6
2:00 PM 6/21/22 52.1 67.2 41.1
3:00 PM 6/21/22 52.5 72.3 41.3
4:00 PM 6/21/22 52.3 70.5 39.7
5:00 PM 6/21/22 52.2 64.6 39.5
6:00 PM 6/21/22 54.6 76.6 41.3
7:00 PM 6/21/22 56.1 73.6 40.7
8:00 PM 6/21/22 52.0 75.3 39.0
9:00 PM 6/21/22 49.2 67.5 38.3
10:00 PM 6/21/22 47.6 68.6 37.5
11:00 PM 6/21/22 45.1 61.2 37.1
12:00 AM 6/22/22 44.7 61.6 37.1
1:00 AM 6/22/22 42.9 61.8 35.6
2:00 AM 6/22/22 42.6 60.5 36.2
3:00 AM 6/22/22 43.0 60.1 36.4
4:00 AM 6/22/22 48.3 68.3 37.0
5:00 AM 6/22/22 47.7 64.3 37.7
6:00 AM 6/22/22 52.1 70.1 42.0
7:00 AM 6/22/22 53.4 67.8 42.4
8:00 AM 6/22/22 62.5 87.3 44.7
9:00 AM 6/22/22 61.8 88.4 45.2
10:00 AM 6/22/22 55.1 74.4 42.7
Source: Compiled by LSA Associates, Inc. (2022). dBA = A-weighted decibel Leq = equivalent continuous sound level Lmax = maximum instantaneous noise level Lmin = minimum measured sound level
Noise Measurement Survey – 24 HR
Project Number: ESL2201.32 Test Personnel: Kevin Nguyendo
Project Name: Mission Villas Equipment: Spark 706RC (SN:18906) Site Number: LT-2 Date: 5/27/22 Time: From 11:00 a.m. To 11:00 a.m.
Site Location: On the western corner bordering a power line near a fence next to a power
Line tower and farm. Primary Noise Sources: Farming vehicles operating in the property to the west of the project
Site.
Comments: Chain link fence near monitor
Photo:
Long-Term (24-Hour) Noise Level Measurement Results at LT-2
Start Time Date Noise Level (dBA) Leq Lmax Lmin 11:00 AM 6/21/22 51.3 71.8 41.3
12:00 PM 6/21/22 48.6 60.9 40.9
1:00 PM 6/21/22 49.4 66.8 41.6
2:00 PM 6/21/22 49.3 60.3 41.6
3:00 PM 6/21/22 49.8 64.5 42.2
4:00 PM 6/21/22 48.3 62.7 40.9
5:00 PM 6/21/22 48.1 65.9 41.0
6:00 PM 6/21/22 47.6 64.0 41.3
7:00 PM 6/21/22 54.3 74.7 41.8
8:00 PM 6/21/22 46.4 65.9 41.3
9:00 PM 6/21/22 45.4 61.1 40.4
10:00 PM 6/21/22 43.9 60.9 40.3
11:00 PM 6/21/22 44.5 62.4 39.8
12:00 AM 6/22/22 41.9 51.6 39.1
1:00 AM 6/22/22 47.6 74.2 38.9
2:00 AM 6/22/22 42.3 62.9 39.5
3:00 AM 6/22/22 42.7 64.4 39.8
4:00 AM 6/22/22 47.5 67.2 40.3
5:00 AM 6/22/22 47.8 60.5 41.3
6:00 AM 6/22/22 50.7 68.4 43.7
7:00 AM 6/22/22 52.5 62.0 44.0
8:00 AM 6/22/22 58.2 78.9 44.6
9:00 AM 6/22/22 59.8 80.5 44.9
10:00 AM 6/22/22 55.9 77.4 43.8
Source: Compiled by LSA Associates, Inc. (2022). dBA = A-weighted decibel Leq = equivalent continuous sound level Lmax = maximum instantaneous noise level Lmin = minimum measured sound level
Noise Measurement Survey
Project Number: ESL2201.32 Test Personnel: Kevin Nguyendo
Project Name: Mission Villas Equipment: Larson Davis 831
Site Location: Northeast corner of project site, south of 8612 Zerelda St.
Primary Noise Sources: Someone watering garden, birds chirping and generally quiet.
Measurement Results
Atmospheric Conditions:
Comments: File # 58.
Site Number: ST-1 Date: 6/21/22 Time: From 11:14 a.m. To 11:34 a.m.
dBA
Leq 45.1
Lmax 52.8
Lmin 33.3
Lpeak 96.5
L2 49.9
L8 47.9 L25 45.9
L50 44.3
SEL
Maximum Wind Velocity (mph)
Average Wind Velocity (mph) 5
Temperature (F) 81
Relative Humidity (%) 36
Comments:
Location Photo:
NOISE AND VIBRATION IMPACT ANALYSIS AUGUST 2022 MISSION VILLAS ROSEMEAD, CALIFORNIA
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APPENDIX B
CONSTRUCTION NOISE CALCULATIONS
Phase: Demolition
Lmax Leq
Concrete Saw 1 90 20 50 0.5 90 83
Excavator 3 81 40 50 0.5 81 82
Dozer 2 82 40 50 0.5 82 81
Combined at 50 feet 91 87
Combined at Receptor 115 feet 84 80
Combined at Receptor 350 feet 74 70
Combined at Receptor 430 feet 72 68
Phase: Site Preparation
Lmax Leq
Dozer 3 82 40 50 0.5 82 83
Tractor 4 84 40 50 0.5 84 86
Combined at 50 feet 86 88
Combined at Receptor 110 feet 79 81
Combined at Receptor 360 feet 69 71
Combined at Receptor 430 feet 67 69
Phase: Grading
Lmax Leq
Excavator 1 81 40 50 0.5 81 77
Grader 1 85 40 50 0.5 85 81
Dozer 1 82 40 50 0.5 82 78
Tractor 3 84 40 50 0.5 84 85
Combined at 50 feet 89 87
Combined at Receptor 115 feet 82 80
Combined at Receptor 360 feet 72 70
Combined at Receptor 430 feet 71 69
Phase:Building Construstion
Lmax Leq
Crane 1 81 16 50 0.5 81 73
Man Lift 3 75 20 50 0.5 75 73
Generator 1 81 50 50 0.5 81 78
Tractor 3 84 40 50 0.5 84 85
Welder / Torch 1 74 40 50 0.5 74 70
Combined at 50 feet 87 86
Combined at Receptor 115 feet 80 79
Combined at Receptor 360 feet 70 69
Combined at Receptor 430 feet 69 67
Phase:Paving
Lmax Leq
Tractor 1 84 40 50 0.5 84 80
Drum Mixer 2 80 50 50 0.5 80 80
Paver 1 77 50 50 0.5 77 74
All Other Equipment > 5 HP 2 85 50 50 0.5 85 85
Roller 2 80 20 50 0.5 80 76
Combined at 50 feet 89 88
Combined at Receptor 115 feet 82 80
Combined at Receptor 360 feet 72 71
Combined at Receptor 430 feet 70 69
Phase:Architectural Coating
Lmax Leq
Compressor (air)1 78 40 50 0.5 78 74
Combined at 50 feet 78 74
Combined at Receptor 115 feet 71 67
Combined at Receptor 360 feet 61 57
Combined at Receptor 430 feet 59 55
Sources: RCNM
1- Percentage of time that a piece of equipment is operating at full power.
dBA – A-weighted Decibels
Lmax- Maximum Level
Leq- Equivalent Level
QuantityEquipment
Equipment Noise Level (dBA)Ground
Effects
Distance to
Receptor (ft)
Usage
Factor1
Reference (dBA)
50 ft LmaxQuantity
Noise Level (dBA)Ground
Effects
Distance to
Receptor (ft)
Usage
Factor1
Reference (dBA)
50 ft Lmax
Noise Level (dBA)
Construction Calculations
Equipment Quantity
Reference (dBA)
50 ft Lmax
Usage
Factor1 Distance to
Receptor (ft)
Ground
Effects
Noise Level (dBA)
Equipment Quantity
Reference (dBA)
50 ft Lmax
Usage
Factor1 Distance to
Receptor (ft)
Ground
Effects
Ground
Effects
Noise Level (dBA)Equipment Quantity
Reference (dBA)
50 ft Lmax
Usage
Factor1 Distance to
Receptor (ft)
Noise Level (dBA)Equipment Quantity
Reference (dBA)
50 ft Lmax
Usage
Factor1 Distance to
Receptor (ft)
Ground
Effects