HomeMy WebLinkAboutItem 5.1 - Attachment 2 - Chula Vista Heritage Industrial Center Noise Study
Acoustical Assessment
Rockefeller Heritage Industrial Center
City of Chula Vista, California
Prepared by:
Kimley-Horn and Associates, Inc.
1100 Town and Country Road, Suite 700
Contact: Mr. Ryan Chiene
714.705.1343
October 2021
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Acoustical Assessment
October 2021
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TABLE OF CONTENTS
1 INTRODUCTION
1.1 Project Location ....................................................................................................................................... 1
1.2 Project Description ................................................................................................................................... 1
2 ACOUSTIC FUNDAMENTALS
2.1 Sound and Environmental Noise .............................................................................................................. 5
2.2 Groundborne Vibration ............................................................................................................................ 9
3 REGULATORY SETTING
3.1 State of California ................................................................................................................................... 11
3.2 Local ....................................................................................................................................................... 11
4 EXISTING CONDITIONS
4.1 Existing Noise Sources ............................................................................................................................ 14
4.2 Sensitive Receptors ................................................................................................................................ 15
5 SIGNIFICANCE CRITERIA AND METHODOLOGY
5.1 CEQA Threshsolds .................................................................................................................................. 17
5.2 Methodology .......................................................................................................................................... 17
6 POTENTIAL IMPACTS AND MITIGATION
6.1 Acoustical Impacts ................................................................................................................................. 19
7 REFERENCES
References .............................................................................................................................................. 29
TABLES
Table 1 Typical Noise Levels .................................................................................................................................. 5
Table 2 Definitions of Acoustical Terms ................................................................................................................ 6
Table 3 Human Reaction and Damage to Buildings for Continuous or Frequent Intermittent Vibrations ........... 9
Table 4 Exterior Noise Limits .............................................................................................................................. 13
Table 5 Interior Noise Limits ............................................................................................................................... 13
Table 6 Existing Noise Measurements ................................................................................................................ 15
Table 7 Typical Construction Noise Levels .......................................................................................................... 20
Table 8 Project Construction Noise Levels at Nearest Uses ............................................................................... 21
Table 9 Project Operational Noise Levels ........................................................................................................... 23
Table 10 Composite Project Operational Noise Levels ......................................................................................... 25
Table 11 Project Traffic Noise Levels .................................................................................................................... 26
Table 12 Typical Construction Equipment Vibration Levels ................................................................................. 27
EXHIBITS
Exhibit 1 Regional Vicinity ....................................................................................................................................... 2
Exhibit 2 Site Vicinity ............................................................................................................................................... 3
Exhibit 3 Conceptual Site Plan ................................................................................................................................ 4
Exhibit 4 Noise Measurement Locations .............................................................................................................. 16
Exhibit 5 Project Noise Contours .......................................................................................................................... 24
APPENDICES
Appendix A: Noise Data
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LIST OF ABBREVIATED TERMS
ADT average daily traffic
APN Assessor’s Parcel Number
CEQA California Environmental Quality Act
CNEL community equivalent noise level
CSMA California Subdivision Map Act
CVMC Chula Vista Municipal Code
dBA A-weighted sound level
dB decibel
du/ac dwelling units per acre
Ldn day-night noise level
Leq equivalent noise level
FHWA Federal Highway Administration
FTA Federal Transit Administration
HVAC heating ventilation and air conditioning
Hz hertz
in/sec inches per second
Lmax maximum noise level
Lmin minimum noise level
µPa micropascals
PPV peak particle velocity
RMS root mean square
VdB vibration velocity level
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Acoustical Assessment
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1 INTRODUCTION
This report documents the results of an Acoustical Assessment completed for the Rockefeller Heritage
Industrial Center Project (“Project” or “Proposed Project”). The purpose of this Acoustical Assessment is
to evaluate the potential construction and operational noise and vibration levels associated with the
Project and determine the level of impact the Project would have on the environment.
1.1 Project Location and Setting
The Project site is in the southern portion of the City of Chula Vista (City), in San Diego County (County),
California; refer to Exhibit 1: Regional Vicinity. The 11.57-acre Project site is located at Assessor’s Parcel
Numbers (APNs) 644-061-01, -02, and -03, approximately 1,950 feet north of Main Street, directly north
of Heritage Road, and approximately one mile south of Olympic Parkway; the site is approximately two
miles north of State Route 905 (SR-905) and one 1 mile east of Interstate-805 (I-805); See Exhibit 1 and
Exhibit 2: Site Vicinity.
The site’s existing land use and zoning designation is Limited Industrial (LI). The Project site is located
within the Chula Vista Vision 2020 General Plan (Chula Vista General Plan) East Planning Area, Otay Ranch
Sub Area, Village 3 North. The immediate surrounding properties consist of the Otay Landfill to the north;
commercial uses to the east; residential uses to the south; and industrial uses to the west of the Project
site.
1.2 Project Description
The Project involves the development of three industrial warehouse buildings (Proposed Buildings A, B,
and C) totaling 202,400 square feet with associated facilities including approximately 24 truck docks, 297
vehicle parking spaces (including 43 electric vehicle [EV] parking spaces and 16 ADA-accessible spaces),
landscaping, and sidewalk improvements; refer to Exhibit 3: Conceptual Site Plan. The Project applicant is
pursuing the Project on a speculative basis and the future occupant(s) are unknown at this time.
Therefore, the Project is conservatively assumed to operate 24 hours per day, seven days per week for
the purposes of this Acoustical Assessment.
Project Circulation
Regional access to the Project site would occur from I-805, SR-905, and State Route 125 (SR-125), and
local access would be provided via Heritage Road (a future designated local truck route). Project site
ingress and egress would be provided by one full access driveway on Santa Maya and one right-in/right-
out driveway access point from Heritage Road. A Class IV bikeway is currently planned for Heritage Road
and existing right-of-way would allow for conversion of Class II to Class IV in the future. Thus, the Project
is not required to dedicate right-of-way for additional bike lanes. All three of the proposed buildings would
also be pedestrian accessible.
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Acoustical Assessment
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Exhibit 1: Regional Vicinity
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Acoustical Assessment
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Exhibit 2: Site Vicinity
N
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Acoustical Assessment
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Exhibit 3: Conceptual Site Plan
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2 ACOUSTIC FUNDAMENTALS
2.1 Sound and Environmental Noise
Acoustics is the science of sound. Sound can be described as the mechanical energy of a vibrating object
transmitted by pressure waves through a medium (e.g., air) to human (or animal) ear. If the pressure
variations occur frequently enough (at least 20 times per second), they can be heard and are called sound.
The number of pressure variations per second is called the frequency of sound and is expressed as cycles
per second, or hertz (Hz).
Noise is defined as loud, unexpected, or annoying sound. In acoustics, the fundamental model consists of
a noise source, a receptor, and the propagation path between the two. The loudness of the noise source,
obstructions, or atmospheric factors affecting the propagation path, determine the perceived sound level
and noise characteristics at the receptor. Acoustics deal primarily with the propagation and control of
sound. A typical noise environment consists of a base of steady background noise that is the sum of many
distant and indistinguishable noise sources. Superimposed on this background noise is the sound from
individual local sources. These sources can vary from an occasional aircraft or train passing by to
continuous noise from traffic on a major highway. Perceptions of sound and noise are highly subjective
from person to person.
Measuring sound directly in terms of pressure would require a large range of numbers. To avoid this, the
decibel (dB) scale was devised. The dB scale uses the hearing threshold of 20 micropascals (µPa) as a point
of reference, defined as 0 dB. Other sound pressures are then compared to this reference pressure, and
the logarithm is taken to keep the numbers in a practical range. The dB scale allows a million-fold increase
in pressure to be expressed as 120 dB, and changes in levels correspond closely to human perception of
relative loudness. Table 1: Typical Noise Levels provides typical noise levels.
Table 1: Typical Noise Levels
Common Outdoor Activities Noise Level (dBA) Common Indoor Activities
– 110 – Rock Band
Jet fly-over at 1,000 feet
– 100 –
Gas lawnmower at 3 feet
– 90 –
Diesel truck at 50 feet at 50 miles per hour Food blender at 3 feet
– 80 – Garbage disposal at 3 feet
Noisy urban area, daytime
Gas lawnmower, 100 feet – 70 – Vacuum cleaner at 10 feet
Commercial area Normal Speech at 3 feet
Heavy traffic at 300 feet – 60 –
Large business office
Quiet urban daytime – 50 – Dishwasher in next room
Quiet urban nighttime – 40 – Theater, large conference room (background)
Quiet suburban nighttime
– 30 – Library
Quiet rural nighttime Bedroom at night, concert hall (background)
– 20 –
Broadcast/recording studio
– 10 –
Lowest threshold of human hearing – 0 – Lowest threshold of human hearing
Source: California Department of Transportation, Technical Noise Supplement to the Traffic Noise Analysis Protocol, September 2013.
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Acoustical Assessment
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Noise Descriptors
The dB scale alone does not adequately characterize how humans perceive noise. The dominant
frequencies of a sound have a substantial effect on the human response to that sound. Several rating
scales have been developed to analyze the adverse effect of community noise on people. Because
environmental noise fluctuates over time, these scales consider that the effect of noise on people is largely
dependent on the total acoustical energy content of the noise, as well as the time of day when the noise
occurs. The equivalent noise level (Leq) is the average noise level averaged over the measurement period,
while the day-night noise level (Ldn) and Community Equivalent Noise Level (CNEL) are measures of energy
average during a 24-hour period, with dB weighted sound levels from 7:00 p.m. to 7:00 a.m. Most
commonly, environmental sounds are described in terms of Leq that has the same acoustical energy as the
summation of all the time-varying events. Each is applicable to this analysis and defined in Table 2:
Definitions of Acoustical Terms.
Table 2: Definitions of Acoustical Terms
Term Definitions
Decibel (dB) A unit describing the amplitude of sound, equal to 20 times the logarithm to the base 10
of the ratio of the pressure of the sound measured to the reference pressure. The reference
pressure for air is 20.
Sound Pressure Level Sound pressure is the sound force per unit area, usually expressed in µPa (or 20
micronewtons per square meter), where 1 pascals is the pressure resulting from a force of
1 newton exerted over an area of 1 square meter. The sound pressure level is expressed in
dB as 20 times the logarithm to the base 10 of the ratio between the pressures exerted by
the sound to a reference sound pressure (e.g. 20 µPa). Sound pressure level is the quantity
that is directly measured by a sound level meter.
Frequency (Hz) The number of complete pressure fluctuations per second above and below atmospheric
pressure. Normal human hearing is between 20 Hz and 20,000 Hz. Infrasonic sound are
below 20 Hz and ultrasonic sounds are above 20,000 Hz.
A-Weighted Sound Level (dBA) The sound pressure level in dB as measured on a sound level meter using the A-weighting
filter network. 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.
Equivalent Noise Level (Leq) The average acoustic energy content of noise for a stated period of time. Thus, the L eq of a
time-varying noise and that of a steady noise are the same if they deliver the same acoustic
energy to the ear during exposure. For evaluating community impacts, this rating scale
does not vary, regardless of whether the noise occurs during the day or the night.
Maximum Noise Level (Lmax)
Minimum Noise Level (Lmin)
The maximum and minimum dBA during the measurement period.
Exceeded Noise Levels
(L01, L10, L50, L90)
The dBA values that are exceeded 1%, 10%, 50%, and 90% of the time during the
measurement period.
Day-Night Noise Level (Ldn) A 24-hour average Leq with a 10 dBA weighting added to noise during the hours of 10:00
p.m. to 7:00 a.m. to account for noise sensitivity at nighttime. The logarithmic effect of
these additions is that a 60 dBA 24-hour Leq would result in a measurement of 66.4 dBA Ldn.
Community Noise Equivalent
Level (CNEL)
A 24-hour average Leq with a 5 dBA weighting during the hours of 7:00 a.m. to 10:00 a.m.
and a 10 dBA weighting added to noise during the hours of 10:00 p.m. to 7:00 a.m. to
account for noise sensitivity in the evening and nighttime, respectively. The logarithmic
effect of these additions is that a 60 dBA 24-hour Leq would result in a measurement of 66.7
dBA CNEL.
Ambient Noise Level The composite of noise from all sources near and far. The normal or existing level of
environmental noise at a given location.
Intrusive That noise which intrudes over and above the existing ambient noise at a given location.
The relative intrusiveness of a sound depends on its amplitude, duration, frequency, and
time of occurrence and tonal or informational content as well as the prevailing ambient
noise level.
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Acoustical Assessment
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The A-weighted decibel (dBA) sound level scale gives greater weight to the frequencies of sound to which
the human ear is most sensitive. Because sound levels can vary markedly over a short period of time, a
method for describing either the average character of the sound or the statistical behavior of the
variations must be utilized. Most commonly, environmental sounds are described in terms of an average
level that has the same acoustical energy as the summation of all the time-varying events.
The scientific instrument used to measure noise is the sound level meter. Sound level meters can
accurately measure environmental noise levels to within about plus or minus 1 dBA. Various computer
models are used to predict environmental noise levels from sources, such as roadways and airports. The
accuracy of the predicted models depends on the distance between the receptor and the noise source.
A-Weighted Decibels
The perceived loudness of sounds is dependent on many factors, including sound pressure level and
frequency content. However, within the usual range of environmental noise levels, perception of loudness
is relatively predictable and can be approximated by dBA values. There is a strong correlation between
dBA and the way the human ear perceives sound. For this reason, the dBA has become the standard tool
of environmental noise assessment. All noise levels reported in this document are in terms of dBA, but
are expressed as dB, unless otherwise noted.
Addition of Decibels
The dB scale is logarithmic, not linear, and therefore sound levels cannot be added or subtracted through
ordinary arithmetic. Two sound levels 10 dB apart differ in acoustic energy by a factor of 10. When the
standard logarithmic dB is A-weighted, an increase of 10 dBA is generally perceived as a doubling in
loudness. For example, a 70-dBA sound is half as loud as an 80-dBA sound and twice as loud as a 60-dBA
sound. When two identical sources are each producing sound of the same loudness, the resulting sound
level at a given distance would be 3 dBA higher than one source under the same conditions. Under the dB
scale, three sources of equal loudness together would produce an increase of 5 dBA.
Sound Propagation and Attenuation
Sound spreads (propagates) uniformly outward in a spherical pattern, and the sound level decreases
(attenuates) at a rate of approximately 6 dB for each doubling of distance from a stationary or point
source. Sound from a line source, such as a highway, propagates outward in a cylindrical pattern. Sound
levels attenuate at a rate of approximately 3 dB for each doubling of distance from a line source, such as
a roadway, depending on ground surface characteristics. No excess attenuation is assumed for hard
surfaces like a parking lot or a body of water. Soft surfaces, such as soft dirt or grass, can absorb sound,
so an excess ground-attenuation value of 1.5 dB per doubling of distance is normally assumed. For line
sources, an overall attenuation rate of 3 dB per doubling of distance is assumed.
Noise levels may also be reduced by intervening structures; generally, a single row of buildings between
the receptor and the noise source reduces the noise level by about 5 dBA, while a solid wall or berm
reduces noise levels by 5 to 10 dBA. The way older homes in California were constructed generally
provides a reduction of exterior-to-interior noise levels of about 20 to 25 dBA with closed windows. The
exterior-to-interior reduction of newer residential units is generally 30 dBA or more.
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Human Response to Noise
The human response to environmental noise is subjective and varies considerably from individual to
individual. Noise in the community has often been cited as a health problem, not in terms of actual
physiological damage, such as hearing impairment, but in terms of inhibiting general well-being and
contributing to undue stress and annoyance. The health effects of noise in the community arise from
interference with human activities, including sleep, speech, recreation, and tasks that demand
concentration or coordination. Hearing loss can occur at the highest noise intensity levels.
Noise environments and consequences of human activities are usually well represented by median noise
levels during the day or night or over a 24-hour period. Environmental noise levels are generally
considered low when the CNEL is below 60 dBA, moderate in the 60 to 70 dBA range, and high above 70
dBA. Examples of low daytime levels are isolated, natural settings with noise levels as low as 20 dBA and
quiet, suburban, residential streets with noise levels around 40 dBA. Noise levels above 45 dBA at night
can disrupt sleep. Examples of moderate-level noise environments are urban residential or semi-
commercial areas (typically 55 to 60 dBA) and commercial locations (typically 60 dBA). People may
consider louder environments adverse, but most will accept the higher levels associated with noisier
urban residential or residential-commercial areas (60 to 75 dBA) or dense urban or industrial areas (65 to
80 dBA). Regarding increases in dBA, the following relationships should be noted:
Except in carefully controlled laboratory experiments, a 1-dBA change cannot be perceived by
humans.
Outside of the laboratory, a 3-dBA change is considered a just-perceivable difference.
A minimum 5-dBA change is required before any noticeable change in community response would
be expected. A 5-dBA increase is typically considered substantial.
A 10-dBA change is subjectively heard as an approximate doubling in loudness and would almost
certainly cause an adverse change in community response.
Effects of Noise on People
Hearing Loss. While physical damage to the ear from an intense noise impulse is rare, a degradation of
auditory acuity can occur even within a community noise environment. Hearing loss occurs mainly due to
chronic exposure to excessive noise but may be due to a single event such as an explosion. Natural hearing
loss associated with aging may also be accelerated from chronic exposure to loud noise. The Occupational
Safety and Health Administration has a noise exposure standard that is set at the noise threshold where
hearing loss may occur from long-term exposures. The maximum allowable level is 90 dBA averaged over
8 hours. If the noise is above 90 dBA, the allowable exposure time is correspondingly shorter.
Annoyance. Attitude surveys are used for measuring the annoyance felt in a community for noises
intruding into homes or affecting outdoor activity areas. In these surveys, it was determined that causes
for annoyance include interference with speech, radio and television, house vibrations, and interference
with sleep and rest. The Ldn as a measure of noise has been found to provide a valid correlation of noise
level and the percentage of people annoyed. People have been asked to judge the annoyance caused by
aircraft noise and ground transportation noise. There continues to be disagreement about the relative
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annoyance of these different sources. A noise level of about 55 dBA Ldn is the threshold at which a
substantial percentage of people begin to report annoyance.1
2.2 Groundborne Vibration
Sources of groundborne vibrations include natural phenomena (earthquakes, volcanic eruptions, sea
waves, landslides, etc.) or man-made causes (explosions, machinery, traffic, trains, construction
equipment, etc.). Vibration sources may be continuous (e.g., factory machinery) or transient (e.g.,
explosions). Ground vibration consists of rapidly fluctuating motions or waves with an average motion of
zero. Several different methods are typically used to quantify vibration amplitude. One is the peak particle
velocity (PPV); another is the root mean square (RMS) velocity. The PPV is defined as the maximum
instantaneous positive or negative peak of the vibration wave. The RMS velocity is defined as the average
of the squared amplitude of the signal. The PPV and RMS vibration velocity amplitudes are used to
evaluate human response to vibration.
Table 3: Human Reaction and Damage to Buildings for Continuous or Frequent Intermittent Vibrations,
displays the reactions of people and the effects on buildings produced by continuous vibration levels. The
annoyance levels shown in the table should be interpreted with care since vibration may be found to be
annoying at much lower levels than those listed, depending on the level of activity or the sensitivity of the
individual. To sensitive individuals, vibrations approaching the threshold of perception can be annoying.
Low-level vibrations frequently cause irritating secondary vibration, such as a slight rattling of windows,
doors, or stacked dishes. The rattling sound can give rise to exaggerated vibration complaints, even
though there is very little risk of actual structural damage. In high noise environments, which are more
prevalent where groundborne vibration approaches perceptible levels, this rattling phenomenon may also
be produced by loud airborne environmental noise causing induced vibration in exterior doors and
windows.
Table 3: Human Reaction and Damage to Buildings for Continuous or Frequent Intermittent Vibrations
Peak Particle
Velocity
(in/sec)
Approximate
Vibration Velocity
Level (VdB)
Human Reaction Effect on Buildings
0.006-0.019 64-74 Range of threshold of perception Vibrations unlikely to cause damage of
any type
0.08
87 Vibrations readily perceptible
Recommended upper level to which
ruins and ancient monuments should be
subjected
0.1 92
Level at which continuous vibrations may
begin to annoy people, particularly those
involved in vibration sensitive activities
Virtually no risk of architectural damage
to normal buildings
0.2
94 Vibrations may begin to annoy people in
buildings
Threshold at which there is a risk of
architectural damage to normal
dwellings
0.4-0.6 98-104
Vibrations considered unpleasant by
people subjected to continuous
vibrations and unacceptable to some
people walking on bridges
Architectural damage and possibly minor
structural damage
Source: California Department of Transportation, Transportation and Construction Vibration Guidance Manual, 2013.
1 Federal Interagency Committee on Noise, Federal Agency Review of Selected Airport Noise Analysis Issues, August 1992.
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Ground vibration can be a concern in instances where buildings shake, and substantial rumblings occur.
However, it is unusual for vibration from typical urban sources such as buses and heavy trucks to be
perceptible. Common sources for groundborne vibration are planes, trains, and construction activities
such as earth-moving which requires the use of heavy-duty earth moving equipment. For the purposes of
this analysis, a PPV descriptor with units of inches per second (in/sec) is used to evaluate construction-
generated vibration for building damage and human complaints.
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3 REGULATORY SETTING
To limit population exposure to physically or psychologically damaging as well as intrusive noise levels,
the Federal government, the State of California, various county governments, and most municipalities in
the state have established standards and ordinances to control noise.
3.1 State of California
California Government Code
California Government Code Section 65302(f) mandates that the legislative body of each county and city
adopt a noise element as part of its comprehensive general plan. The local noise element must recognize
the land use compatibility guidelines established by the State Department of Health Services. The
guidelines rank noise land use compatibility in terms of “normally acceptable”, “conditionally acceptable”,
“normally unacceptable”, and “clearly unacceptable” noise levels for various land use types. Single-family
homes are “normally acceptable” in exterior noise environments up to 60 CNEL and “conditionally
acceptable” up to 70 CNEL. Multiple-family residential uses are “normally acceptable” up to 65 CNEL and
“conditionally acceptable” up to 70 CNEL. Schools, libraries, and churches are “normally acceptable” up
to 70 CNEL, as are office buildings and business, commercial, and professional uses.
Title 24 – Building Code
The State’s noise insulation standards are codified in the California Code of Regulations, Title 24: Part 1,
Building Standards Administrative Code, and Part 2, California Building Code. These noise standards are
applied to new construction in California for interior noise compatibility from exterior noise sources. The
regulations specify that acoustical studies must be prepared when noise-sensitive structures, such as
residential buildings, schools, or hospitals, are located near major transportation noise sources, and
where such noise sources create an exterior noise level of 65 dBA CNEL or higher. Acoustical studies that
accompany building plans must demonstrate that the structure has been designed to limit interior noise
in habitable rooms to acceptable noise levels. For new multi-family residential buildings, the acceptable
interior noise limit for new construction is 45 dBA CNEL.
3.2 Local
City of Chula Vista General Plan
Adopted on December 13, 2005, the Chula Vista Vision 2020 General Plan (Chula Vista General Plan)
identifies noise standards that are used as guidelines to evaluate transportation noise level impacts. These
standards are also used to assess the long-term traffic noise impacts on specific land uses. According to
the Chula Vista General Plan, land uses such as residences have acceptable exterior noise levels of up to
65 dBA CNEL. Based on the guidelines in the Chula Vista General Plan, an exterior noise level of 65 dBA
CNEL is generally considered the maximum exterior noise level for sensitive receptors.
Land uses near these significant noise-producers can incorporate buffers and noise control techniques
including setbacks, landscaping, building transitions, site design, and building construction techniques to
reduce the impact of excessive noise. Selection of the appropriate noise control technique would vary
depending on the level of noise that needs to be reduced as well as the location and intended land use.
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The City has adopted the Noise Section of the Environmental Element as a part of the Chula Vista General
Plan. The Noise section specifies the levels of noise exposure that are generally considered to be
compatible with various types of land uses. Additionally, the Noise section identifies transportation noise
policies designed to protect, create, and maintain an environment free of harmful noise that could impact
the health and welfare of sensitive receptors. The following Chula Vista General Plan goals, policies, and
actions for addressing noise are applicable to the Project:
Objective – E 21: Protect people from excessive noise through careful land use planning
and the incorporation of appropriate mitigation techniques.
Policy E 21.1: Apply the exterior land use-noise compatibility guidelines listed in Table 9-2 of this
Environmental Element to new development, where applicable, and in light of project-
specific considerations.
Policy E 21.2: Where applicable, the assessment and mitigation of interior noise levels shall adhere to
the applicable requirements of the California Building Code with local amendments and
other applicable established City standards.
Policy E 21.3: Promote the use of available technologies in building construction to improve noise
attenuation capacities.
Policy E 21.4: Continue to implement and enforce the City's noise control ordinance.
Objective – E 22: Protect the community from the effects of transportation noise.
Policy E 22.1: Work to stabilize traffic volumes in residential neighborhoods by limiting throughways
and by facilitating the use of alternative routes around, rather than through,
Neighborhoods.
Policy E 22.2: Explore the feasibility of using new technologies to minimize traffic noise, such as use
of rubberized asphalt in road surface materials.
Policy E 22.3: Employ traffic calming measures, where appropriate, such as narrow roadways and on-
street parking, in commercial and mixed use districts.
Policy E 22.4: Encourage walking; biking; carpooling; use of public transit; and other alternative
modes of transportation to minimize vehicular use and associated traffic noise.
Policy E 22.5: Require projects to construct appropriate mitigation measures in order to attenuate
existing and projected traffic noise levels, in accordance with applicable standards,
including the exterior land use/noise compatibility guidelines listed in Table 9-2 of this
Environmental Element.
Chula Vista Municipal Code
Standards established under the Chula Vista Municipal Code (CVMC) are used to analyze noise impacts
originating from the Project. Operational noise impacts are typically governed by CVMC Chapter 19.68
(Performance Standards and Noise Control). CVMC Chapter 19.68 also provides guidelines for non-
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transportation and stationary noise source impacts from operations at private properties. Applicable
guidelines indicate that no person shall create or cause any sound exceeding the City’s stated noise
performance standards measured at the property line of any residentially zoned property. CVMC §
19.68.030 (Exterior Noise Limits) details the performance standards for exterior noise and CMVC §
19.68.040 establishes interior noise level standards for various categories of land use; see Table 4: Exterior
Noise Limits and Table 5: Interior Noise Limits.
Table 4: Exterior Noise Limits
Receiving Land Use Category 10 p.m. to 7 a.m. (Weekdays)1 7 a.m. to 10 p.m. (Weekdays)1
10 p.m. to 8 a.m. (Weekends)1 8 a.m. to 10 p.m. (Weekends)1
All residential
(except multiple dwelling) 45 55
Multiple dwelling residential 50 60
Commercial 60 65
Light industry – I-R and I-L zone 70 70
Heavy industry – I zone 80 80
Notes:
1. Noise standards are expressed in terms of 1-hour Leq.
Source: City of Chula Vista, Chula Vista Municipal Code, Section, 19.68.030.
Table 5: Interior Noise Limits
Type of Land Use Time Interval
Noise Level (dBA) not to be Exceeded
Any time 1 min in 1 hr 5 min in 1 hr
Multifamily 10 p.m. to 7 a.m. 45 40 35
Residential 7 a.m. to 10 p.m. 55 50 45
Source: City of Chula Vista, Chula Vista Municipal Code, Section, 19.68.030.
It is noted that CMVC § 19.68.030(B)(4) states that should the measured ambient noise level exceed the
standards in Table 4, the allowable noise exposure standard shall be the ambient noise level. Further,
CMVC § 17.24.040 establishes limited hours of construction activities. CMVC § 17.24.040 states that
construction activities in residential zones may only take place between the hours of 7:00 a.m. and 10:00
p.m. on weekdays and between the hours of 8:00 a.m. and 10:00 p.m. on Saturdays and Sundays, except
in the case of urgent necessity or otherwise approved by the City of Chula Vista.
Otay Ranch Villages Two, Three, and a Portion of Village Four Sectional Planning Area (SPA) Plan Final
Second Tier Environmental Impact Report
The Project site is located within Village Three of the Otay Ranch General Development Plan (Otay Ranch
GDP) area and was evaluated for noise impacts in the Otay Ranch Villages Two, Three, and a Portion of
Village Four Sectional Planning Area (SPA) Plan Final Second Tier Environmental Impact Report (Otay
Ranch Villages 2-4 EIR) (May 2006). Mitigation Measure 5.12-6 of the Otay Ranch Villages 2-4 EIR requires
a noise analysis showing compliance with the City’s Noise Control Ordinance when industrial uses are
proposed adjacent to residential uses (such as the proposed Project). Thus, this Acoustical Assessment
has been prepared to satisfy the requirements of Mitigation Measure 5.12-6 from the Otay Ranch Villages
2-4 EIR.
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4 EXISTING CONDITIONS
4.1 Existing Noise Sources
The City is impacted by various noise sources. Many sources contribute to the noise levels experienced
within Chula Vista, including vehicular traffic; active commercial and business centers; air conditioning
systems; and the operation of landscape equipment. In the City, the most prevalent noise source is
vehicular traffic. According to the University Villages Project Draft Environmental Impact Report
(November 2014), the Project site is located within the 50-65 dBA traffic noise contour along Heritage
Road. Further, the noise contour maps presented in the Chula Vista General Plan indicate that the City’s
noise levels are projected to increase, due to the construction of new roads and increasing traffic volumes
throughout the City and the region. Other noise sources in the Project vicinity include amplified speaker
noise from concerts at the North Island Credit Union Amphitheatre (approximately 0.50-mile to the
south), industrial operations at surrounding properties (e.g., the Otay Landfill to the north and automotive
businesses to the west), and noise associated with residential uses.
Mobile Sources
According to 2015 Average Daily Traffic data from the San Diego Association of Governments (SANDAG),
the Heritage Road segment closest to the Project site has average daily traffic of approximately 12,400
vehicle trips.2 Existing roadway noise levels were calculated for the East Palomar to Olympic Parkway
segment of Heritage Road in the Project vicinity using the Federal Highway Administration (FHWA)
Highway Traffic Noise Prediction Model (FHWA-RD-77-108) and existing traffic volumes from traffic count
data from SANDAG. The noise prediction model calculates the average noise level at specific locations
based on traffic volumes, average speeds, roadway geometry, and site environmental conditions. The
average vehicle noise rates (also referred to as energy rates) used in the FHWA model have been modified
to reflect average vehicle noise rates identified for California by the California Department of
Transportation (Caltrans). The Caltrans data indicates that California automobile noise is 0.8 to 1.0 dBA
higher than national levels and that medium and heavy truck noise is 0.3 to 3.0 dBA lower than national
levels. The existing Community Noise Equivalent Level (CNEL) at 100 feet from the East Palomar to Olympic
Parkway segment of Heritage Road, within the Project vicinity, is approximately 69.6 dBA. Refer to
Appendix A: Noise Data for noise modeling results.
Stationary Sources
The primary sources of stationary noise in the Project vicinity are those associated with industrial
operations to the north and west, commercial operations to the east of the Project site, and at the
residential neighborhood to the south of the site. Such noise sources include the use of mechanical
equipment (e.g., heating, ventilation, and air conditioning [HVAC] equipment), idling vehicles, music
playing, dogs barking, and people talking. The noise associated with these sources may represent a single-
event noise occurrence or short-term noise.
2 San Diego Association of Governments, City of Chula Vista Average Traffic Volumes, accessed August 12, 2021 at
ttps://www.sandag.org/resources/demographics_and_other_data/transportation/adtv/chulavista_adt.pdf.
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Noise Measurements
To quantify existing ambient noise levels in the Project area, Kimley-Horn conducted four short-term (10-
minute) measurements on August 17, 2021, and one long-term noise measurement (24 hours in duration)
from August 17, 2021 to August 18, 2021; see Appendix A. The noise measurement sites were
representative of typical existing noise exposure within and immediately adjacent to the Project site. The
10-minute daytime measurements were taken between 8:59 a.m. and 9:48 a.m. Measurements of L eq are
considered representative of the noise levels throughout the day. The average noise levels and sources of
noise measured at each location are listed in Table 6: Existing Noise Measurements and shown on Exhibit
4: Noise Measurement Locations.
Table 6: Existing Noise Measurements
Site Location Date Time Duration
Daytime
Average
Leq (dBA) 1
Nighttime
Average Leq
(dBA) 1
24-hour
Average
Leq (dBA)
Short-Term Noise Measurements (10-minute measurements)
ST-1 In cul-de-sac along Energy Way to the
west of the Project site. 8/17/21 8:59 a.m. 10 min 56.9 - -
ST-2
Along Santa Maya in residential
neighborhood to the south of the
Project site.
8/17/21 9:13 a.m. 10 min 63.6 - -
ST-3
Along Paseo Lugo in residential
neighborhood to the south of the
Project site.
8/17/21 9:51 a.m. 10 min 64.5 - -
ST-4 Adjacent to Escaya Park to the south
of the Project site. 8/17/21 9:37 a.m. 10 min 49.6 - -
Long-Term Noise Measurement (24-hour measurement)
LT-1 Adjacent to single-family residences
along Paseo Lugo.
8/17/21 to
8/18/21 10:19 a.m. 24 hr 55.9 50.7 54.5
Notes:
1. Daytime hours are from 7:00 a.m. to 10:00 p.m. and nighttime hours are from 10:00 p.m. to 7:00 a.m. The 15-hour daytime average (15-hour L eq)
and 9-hour daytime average (9-hour Leq) for LT-1 were calculated from 24-hour measurement data obtained by Kimley-Horn on August 17-18, 2021.
The daytime average noise levels for ST-1 through ST-4 represent the 10-minute measurement data taken by Kimley-Horn on August 17, 2021.
Source: Noise measurements taken by Kimley-Horn and Associates, August 17-18, 2021. See Appendix A for noise measurement results.
4.2 Sensitive Receptors
Noise exposure standards and guidelines for various types of land uses reflect the varying noise
sensitivities associated with each of these uses. Residences, hospitals, schools, guest lodging, libraries,
and churches are treated as the most sensitive to noise intrusion and therefore have more stringent noise
exposure targets than do other uses, such as manufacturing or agricultural uses that are not subject to
impacts such as sleep disturbance. Sensitive land uses near the Project site include single-family
residential homes approximately 155 feet to the south (south of Heritage Road), and Escaya Park
approximately 720 feet to the southeast.
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Exhibit 4: Noise Measurement Locations
N
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5 SIGNIFICANCE CRITERIA AND METHODOLOGY
5.1 CEQA Thresholds
Appendix G of the California Environmental Quality Act (CEQA) Guidelines contains analysis guidelines
related to noise impacts. These guidelines have been used by the City to develop thresholds of significance
for this analysis. A project would create a significant environmental impact if it would:
Generate a substantial temporary or permanent increase in ambient noise levels in the vicinity of
the project in excess of standards established in the local general plan or noise ordinance, or
applicable standards of other agencies;
Generate excessive groundborne vibration or groundborne noise levels; and
For a project located within the vicinity of a private airstrip or an airport land use plan or, where
such a plan has not been adopted, within two miles of a public airport or public use airport, expose
people residing or working in the Project area to excessive noise levels.
5.2 Methodology
Construction
Construction noise levels were based on typical noise levels generated by construction equipment
published by the Federal Transit Administration (FTA) and FHWA. Construction noise is assessed in dBA
Leq. This unit is appropriate because Leq can be used to describe noise level from operation of each piece
of equipment separately, and levels can be combined to represent the noise level from all equipment
operating during a given period.
FHWA’s Roadway Construction Noise Model (RCNM) was used to estimate construction noise at nearby
sensitive receptors. For modeling purposes, construction equipment has been distributed evenly between
the center of the construction site and the nearest receptor. To be conservative, the loudest and most
used equipment was placed nearest the sensitive receptor. Noise level estimates do not account for the
presence of intervening structures or topography, which may reduce noise levels at receptor locations.
Therefore, the noise levels presented herein represent a conservative, reasonable worst-case estimate of
actual temporary construction noise.
Operations
The analysis of the Without Project and With Project noise environments is based on noise prediction
modeling and empirical observations. Reference noise level data are used to estimate the Project
operational noise impacts from stationary sources. Noise levels are collected from field noise
measurements and other published sources from similar types of activities are used to estimate noise
levels expected with the Project’s stationary sources. The reference noise levels are used to represent a
worst-case noise environment as noise level from stationary sources can vary throughout the day.
Operational noise is evaluated based on the standards within the CVMC and Chula Vista General Plan. The
Without Project and With Project traffic noise levels in the Project vicinity were calculated using the FHWA
Highway Noise Prediction Model (FHWA-RD-77-108).
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Vibration
Groundborne vibration levels associated with construction-related activities for the Project were
evaluated utilizing typical groundborne vibration levels associated with construction equipment, obtained
from FTA published data for construction equipment. Potential groundborne vibration impacts related to
building/structure damage and interference with sensitive existing operations were evaluated,
considering the distance from construction activities to nearby land uses and typically applied criteria.
For a building that is constructed with reinforced concrete with no plaster, the FTA guidelines show that
a vibration level of up to 0.20 in/sec PPV is considered safe and would not result in any vibration damage.
Human annoyance is evaluated in vibration decibels (VdB) (the vibration velocity level in decibel scale)
and occurs when construction vibration rises significantly above the threshold of human perception for
extended periods of time. The FTA’s 2018 Transit Noise and Vibration Impact Assessment Manual (FTA
Transit Noise and Vibration Manual) identifies 80 VdB as the threshold for buildings where people
normally sleep.
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6 POTENTIAL IMPACTS AND MITIGATION
6.1 Acoustical Impacts
Threshold 6.1 Would the project generate a substantial temporary or permanent increase in ambient
noise levels in the vicinity of the project in excess of standards established in the local
general plan or noise ordinance, or applicable standards of other agencies?
Construction
Construction noise typically occurs intermittently and varies depending on the nature or phase of
construction (e.g., land clearing, grading, excavation, paving). Noise generated by construction
equipment, including earth movers, material handlers, and portable generators, can reach high levels.
During construction, exterior noise levels could affect the residential neighborhoods surrounding the
construction site. The nearest sensitive receptors are single-family residential homes approximately 133
feet to the south of the Project site, south of Heritage Road. However, it is acknowledged that construction
activities would occur throughout the Project site and would not be concentrated at a single point near
sensitive receptors.
Construction activities would include site preparation, grading, building construction, paving, and
architectural coating. Such activities could require dozers and tractors during site preparation; excavators,
graders, and dozers during grading; cranes, forklifts, generators, tractors, and welders during building
construction; pavers, rollers, mixers, and paving equipment during paving; and air compressors during
architectural coating. Typical operating cycles for these types of construction equipment may involve 1 or
2 minutes of full power operation followed by 3 to 4 minutes at lower power settings. Other primary
sources of acoustical disturbance would be random incidents, which would last less than one minute (such
as dropping large pieces of equipment or the hydraulic movement of machinery lifts). Noise generated by
construction equipment, including earth movers, material handlers, and portable generators, can reach
high levels. Typical noise levels associated with individual construction equipment are listed in Table 7:
Typical Construction Noise Levels.
The CVMC does not establish quantitative construction noise standards. Instead, the CVMC establishes
limited hours of construction activities. CVMC § 17.24.040 states that construction activities in residential
zones may only take place between the hours of 7:00 a.m. and 10:00 p.m. on weekdays and between the
hours of 8:00 a.m. and 10:00 p.m. on Saturdays and Sundays, except in the case of urgent necessity or
otherwise approved by the City of Chula Vista. However, this analysis conservatively uses the FTA’s
threshold of 80 dBA (8-hour Leq) for residential uses, 85 dBA (8-hour Leq) for commercial uses, and 90 dBA
(8-hour Leq) for industrial uses to evaluate construction noise impacts.3
3 Federal Transit Administration, Transit Noise and Vibration Impact Assessment Manual, Table 7-2, Page 179, September 2018.
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Table 7: Typical Construction Noise Levels
Equipment Typical Noise Level (dBA) at 50 feet from Source
Air Compressor 80
Backhoe 80
Compactor 82
Concrete Mixer 85
Concrete Pump 82
Concrete Vibrator 76
Crane, Derrick 88
Crane, Mobile 83
Dozer 85
Generator 82
Grader 85
Impact Wrench 85
Jack Hammer 88
Loader 80
Paver 85
Pneumatic Tool 85
Pump 77
Roller 85
Saw 76
Scraper 85
Shovel 82
Truck 84
Note:
1. Calculated using the inverse square law formula for sound attenuation: dBA2 = dBA1+20Log(d1/d2)
Where: dBA2 = estimated noise level at receptor; dBA1 = reference noise level; d1 = reference distance; d2 =
receptor location distance
Source: Federal Transit Administration, Transit Noise and Vibration Impact Assessment Manual, September 2018.
The noise levels calculated in Table 8: Project Construction Noise Levels at Nearest Uses, show estimated
exterior construction noise levels at the nearest off-site uses without accounting for attenuation from
physical barriers or topography. As depicted in Table 8, construction noise levels would not exceed the
FTA’s construction noise thresholds at the nearest off-site uses, including the residences to the south of
the Project site. It is noted the results in Table 8 depict a worst-case scenario for each phase of
construction, conservatively assuming the two loudest pieces of equipment would operate
simultaneously while located as close to the nearest sensitive receptor as possible. However, it is
anticipated that construction equipment would operate throughout the Project site and the associated
noise levels would not occur at a fixed location for extended periods of time. Compliance with the CVMC
would further minimize potential impacts from construction noise, as construction would be limited to
daytime hours on weekdays and Saturdays. Therefore, construction noise impacts would be less than
significant.
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Table 8: Project Construction Noise Levels at Nearest Uses
Construction Phase Receiving
Land Use
Receiver
Distance
(feet)
Direction
from
Project Site
Modeled Exterior
Construction
Noise Level
(dBA Leq)
Noise
Threshold
(dBA Leq)
Exceed
Threshold?
Site Preparation
Industrial 30 West 88.2 90 No
Commercial 50 East 83.8 85 No
Residential 155 South 74.0 80 No
Grading
Industrial 30 West 87.1 90 No
Commercial 50 East 82.7 85 No
Residential 155 South 72.9 80 No
Building
Construction
Industrial 30 West 85.2 90 No
Commercial 50 East 79.9 85 No
Residential 155 South 70.9 80 No
Paving
Industrial 30 West 81.1 90 No
Commercial 50 East 76.7 85 No
Residential 155 South 66.8 80 No
Architectural
Coating
Industrial 30 West 81.1 90 No
Commercial 50 East 76.7 85 No
Residential 155 South 66.9 80 No
Note: Two loudest pieces of construction equipment assumed to operate simultaneously and at Project site boundary closest to the receiving
land use.
Source: Federal Highway Administration, Roadway Construction Noise Model, 2006. Refer to Appendix A for noise modeling results.
Operations
Implementation of the proposed Project would create new sources of long-term noise in the Project
vicinity. The major noise sources associated with the Project that would potentially impact existing nearby
residences include mechanical equipment (i.e., HVAC equipment); truck and loading dock operations (i.e.,
slow moving truck on the site, maneuvering and idling trucks, equipment noise); parking areas (i.e., car
door slamming, car radios, engine start-up, and car pass-by); and off-site traffic noise.
Mechanical Equipment
The nearest sensitive receptors to the Project site are the residences located directly south opposite of
Heritage Road. Potential stationary noise sources related to long-term operation of the Project would
include mechanical equipment. Mechanical equipment (e.g., HVAC equipment) typically generates noise
levels of approximately 52 dBA at 50 feet.4 Based on Project site plans, the nearest potential location for
an HVAC unit would be located approximately 290 feet from the nearest residential property. The
simultaneous operation of 17 rooftop HVAC units (8 at Building A, 4 at Building B, and 5 at Building C)
were modeled as point sources in SoundPLAN.
Truck and Loading Dock Noise
During loading and unloading activities, noise would be generated by the trucks’ diesel engines, exhaust
systems, and brakes during low gear shifting’ braking activities; backing up toward the docks; dropping
down the dock ramps; and maneuvering away from the docks. Truck loading/unloading activities would
4 Elliott H. Berger, Rick Neitzel, and Cynthia A. Kladden, Noise Navigator Sound Level Database with Over 1700 Measurement
Values, 2015.
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occur on the western facade of Building A, and on the northern façades of Buildings B and C. The nearest
residences are located approximately 360 feet to the south of the dock-high doors at Building B. Truck
and loading dock noise is typically 64.4 dBA at 50 feet.5 Truck loading/unloading operations at the Project
site were modeled as area sources in SoundPLAN as follows: one area source was modeled on the western
façade of Building A; two area sources were modeled at Building B (one on the northern façade at the
northwestern corner, and one on the northern façade at the northeastern corner of the building); and
one area source was modeled on the northern façade at the northwestern corner of Building C.
It is noted the loading dock doors would be surrounded with protective aprons, gaskets, or similar
improvements that, when a trailer is docked, would serve as a noise barrier between the interior
warehouse activities and the exterior loading area. This would attenuate noise emanating from interior
activities, and as such, noise form interior loading and associated activities would not be perceptible at
the nearest sensitive receptors. In addition, the intervening warehouse buildings and retaining walls on
the Project site would act as a buffer and reduce truck loading/unloading noise levels at the nearest
sensitive receptors (residential uses) to the south of the Project site.
Parking Noise
The Project would provide approximately 24 truck docks and 297 vehicle parking spaces (see Section 1.2,
Project Description). Parking stalls would be located on the eastern, southern, and western sides of the
proposed warehouse buildings near the site perimeter. Traffic associated with parking lots is typically not
of sufficient volume to exceed community noise standards, which are usually based on a time-averaged
scale such as the CNEL scale. The maximum sound levels generated by a car door slamming, engine
starting up, and car pass-bys range from 53 to 61 dBA6 and may be an annoyance to adjacent noise-
sensitive receptors. However, parking noise events would be instantaneous and short-term in duration.
Additionally, parking noise also occurs at the adjacent properties to the east and west under existing
conditions. Parking, driveway, and noise from on-site vehicle circulation would be consistent with existing
noise in the vicinity and would be partially masked by background traffic noise from motor vehicles
traveling along Heritage Road to the south of the Project site. Noise from on-site parking lot movements
were modeled as roadway sources in SoundPLAN and were assumed to occur throughout the Project site.
Combined On-Site Noise Levels
Exterior noise levels associated with mechanical equipment, truck and loading dock operations, and
parking areas were modeled with the SoundPLAN software. SoundPLAN allows computer simulations of
noise situations, and creates noise contour maps using reference noise levels, topography, point and area
noise sources, mobile noise sources, and intervening structures. Inputs to the SoundPLAN model included
ground topography and ground type, existing and proposed intervening structures, noise source locations
and heights, receiver locations, and sound power level data. The SoundPLAN run for Project operations
conservatively assumes the simultaneous operation of all on-site noise sources.
Utilizing the reference noise level data described above, SoundPLAN was used to calculate noise levels at
the nearest sensitive receptors surrounding the Project site. It should be noted that predicted noise levels
are conservative estimates since it was assumed that all equipment and operational activity at the Project
site would occur in a constant, simultaneous manner during the daytime and nighttime hours. In reality,
5 Loading dock reference noise level measurements conducted by Kimley-Horn on December 18, 2018.
6 Kariel, H. G., Noise in Rural Recreational Environments, Canadian Acoustics 19(5), 3-10, 1991.
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it is anticipated that these noise sources would occur intermittently throughout the day and night (except
for rooftop HVAC which could operate in a steady-state manner). The modeled noise levels also account
for noise attenuation from the existing perimeter wall at the residential neighborhood to the south of the
Project site along Heritage Road. The modeled noise levels for the Project are provided in Table 9:
Modeled Project Noise Levels, Exhibit 5: Project Noise Contours.
Table 9: Project Operational Noise Levels
Receptor No. Land Use Modeled Noise Level (dBA Leq1-hr)
1st Floor 2nd Floor
1 Residential 39.2 39.6
2 Residential 39.5 39.9
3 Residential 39.6 39.9
4 Residential 42.5 42.9
5 Residential 43.3 43.8
6 Residential 43.8 44.5
7 Residential 45.3 46.2
8 Residential 46.8 47.8
9 Residential 48.6 49.6
10 Residential 48.4 49.1
11 Residential 48.0 48.8
12 Residential 48.5 49.3
13 Residential 49.6 49.9
14 Residential 47.1 47.3
15 Residential 45.5 45.8
16 Residential 44.3 44.5
17 Residential 44.0 44.3
18 Residential 41.1 41.5
19 Residential 40.6 41.3
20 Residential 41.1 41.3
Source: SoundPLAN Essential version 5.0. See Appendix A for noise modeling data and results.
As shown in Table 9, Project-generated noise levels at the nearest residential uses would range from 39.2
dBA to 49.6 dBA at first floor receptors, and 39.6 dBA to 49.9 dBA at second floor receptors. Table 10:
Composite Project Operational Noise shows Project noise levels from all sources combined with existing
ambient levels. According to the California Department of Transportation (Caltrans) Technical Noise
Supplement to the Traffic Noise Analysis Protocol (2013), a noise level increase of 3 dBA is generally
regarded as barely perceivable. As such, for the purposes of this analysis, a 3 dBA Leq increase in
operational noise levels over existing ambient noise levels at a noise-sensitive use is considered a
significant impact. It is noted that the measured ambient levels (see Table 6) currently exceed the City’s
daytime and nighttime noise standards for residential uses established in CVMC § 19.68.030(A)(4). Thus,
the measured ambient level was used as the noise standard to evaluate Project noise impacts in
compliance with CVMC § 19.68.030(B)(4). As shown in Table 9 and Table 10, Project-generated noise
levels would not exceed the measured ambient daytime and/or nighttime noise levels at the nearest
residential uses to the south of the Project site. In addition, Table 10 shows that the maximum increase
in ambient noise levels from the Project would be 1.0 dBA during the daytime and 2.6 dBA during the
nighttime at the nearest residential uses and would not result in a perceptible 3 dBA noise increase.
Therefore, the Project’s operational noise levels would not result in a significant increase over existing
ambient noise levels at the nearest noise-sensitive uses. Impacts would be less than significant in this
regard.
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Exhibit 5: Project Noise Contours
Source: SoundPLAN version 5.0
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Table 10: Composite Project Operational Noise
Receptor
No. Land Use
Daytime Nighttime
Ambient
Noise Level
(dBA Leq) 1,2
Composite
Project
Operations
Ambient
+ Project
(dBA Leq)
Increase
Over
Ambient
(dBA Leq) 3
Significant?
Ambient
Noise Level
(dBA Leq) 1,2
Composite
Project
Operations
Ambient
+ Project
(dBA Leq)
Increase
Over
Ambient
(dBA Leq) 3
Significant?
1 Residential 55.9 39.6 56.0 0.1 No 50.7 39.6 51.0 0.3 No
2 Residential 55.9 39.9 56.0 0.1 No 50.7 39.9 51.0 0.3 No
3 Residential 55.9 39.9 56.0 0.1 No 50.7 39.9 51.0 0.3 No
4 Residential 55.9 42.9 56.1 0.2 No 50.7 42.9 51.3 0.7 No
5 Residential 55.9 43.8 56.2 0.3 No 50.7 43.8 51.4 0.8 No
6 Residential 55.9 44.5 56.2 0.3 No 50.7 44.5 51.5 0.9 No
7 Residential 55.9 46.2 56.3 0.4 No 50.7 46.2 51.8 1.3 No
8 Residential 55.9 47.8 56.5 0.6 No 50.7 47.8 52.2 1.8 No
9 Residential 55.9 49.6 56.8 0.9 No 50.7 49.6 52.8 2.5 No
10 Residential 55.9 49.1 56.7 0.8 No 50.7 49.1 52.7 2.3 No
11 Residential 55.9 48.8 56.7 0.8 No 50.7 48.8 52.6 2.2 No
12 Residential 55.9 49.3 56.8 0.9 No 50.7 49.3 52.8 2.4 No
13 Residential 55.9 49.9 56.9 1.0 No 50.7 49.9 53.1 2.6 No
14 Residential 55.9 47.3 56.5 0.6 No 50.7 47.3 52.3 1.6 No
15 Residential 55.9 45.8 56.3 0.4 No 50.7 45.8 51.9 1.2 No
16 Residential 55.9 44.5 56.2 0.3 No 50.7 44.5 51.6 0.9 No
17 Residential 55.9 44.3 56.2 0.3 No 50.7 44.3 51.6 0.9 No
18 Residential 55.9 41.5 56.1 0.2 No 50.7 41.5 51.2 0.5 No
19 Residential 55.9 41.3 56.0 0.1 No 50.7 41.3 51.2 0.5 No
20 Residential 55.9 41.3 56.0 0.1 No 50.7 41.3 51.2 0.5 No
Notes:
1. See Table 6 for ambient noise level data.
2. The measured ambient noise level exceeds the noise standards for residential uses established in CVMC § 19.68.030(A)(4). Therefore, the measured ambient noise levels obtained by Kimley-Horn on August 17-18,
2021 are the base noise level used to analyze impacts from the Project in accordance with CVMC § 19.68.030(B)(4).
3. An increase of 3 dBA is barely perceptible. Therefore, an increase of 3 dBA or more is considered significant.
Source: SoundPLAN version 5.0. See Appendix A for noise modeling data and results.
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Off-Site Traffic Noise
Implementation of the Project would generate increased traffic volumes along nearby roadway segments.
According to the trip generation data for the Project, the proposed Project would generate 1,669 total
daily trips7 which would result in noise increases on Project area roadways. In general, a traffic noise
increase of less than 3 dBA is barely perceptible to people, while a 5-dBA increase is readily noticeable.8
Generally, traffic volumes on Project area roadways would have to approximately double for the resulting
traffic noise levels to increase by 3 dBA. Therefore, permanent increases in ambient noise levels of less
than 3 dBA are considered to be less than significant.
Traffic noise levels for roadways primarily affected by the Project were calculated using the FHWA’s
Highway Noise Prediction Model (FHWA-RD-77-108). Traffic noise modeling was conducted for conditions
with and without the Project, based on the trip generation data for the Project.9 As indicated in Table 11:
Project Traffic Noise Levels, Existing Plus Project traffic-generated noise levels on Heritage Road (the
nearest roadway to the Project site) would be approximately 70.1 dBA CNEL at 100 feet from the
centerline, and the Project would result in a maximum increase of 0.5 dBA CNEL compared to existing
conditions. Thus, noise impacts from off-site traffic would be less than significant.
Table 11: Project Traffic Noise Levels
Roadway Segment
Existing Existing
Plus Project
Project
Change from
Existing
Conditions
Significant
Impact? ADT1 dBA
CNEL2 ADT dBA
CNEL1
Heritage Road
East Palomar Street to Olympic Parkway 12,400 69.6 14,069 70.1 0.5 No
ADT = average daily trips; dBA = A-weighted decibels; CNEL= Community Equivalent Noise Level
1. Based on traffic data provided by the San Diego Association of Governments, 2015.
2. Traffic noise levels are at 100 feet from the roadway centerline.
Source: Refer to Appendix A for traffic noise modeling results.
Mitigation Measures: No mitigation is required.
Level of Significance: Less than significant impact.
Threshold 6.2 Would the Project generate excessive groundborne vibration or groundborne noise
levels?
Increases in groundborne vibration levels attributable to the proposed Project would be primarily
associated with short-term construction-related activities. The FTA has published standard vibration
velocities for construction equipment operations in the FTA Transit Noise and Vibration Manual (2018).
The types of construction vibration impacts include human annoyance and building damage. Building
damage can be cosmetic or structural. Ordinary buildings that are not particularly fragile would not
experience cosmetic damage (e.g., plaster cracks) at distances beyond 30 feet. This distance can vary
substantially depending on soil composition and underground geological layer between vibration source
7 Kimley-Horn and Associates, Project Information for Transportation Studies, Rockefeller - Escaya Industrial Park, 2021.
8 Federal Highway Administration, Highway Traffic Noise Analysis and Abatement Policy and Guidance, Noise Fundamentals,
https://www.fhwa.dot.gov/environMent/noise/regulations_and_guidance/polguide/polguide02.cfm, accessed August 12, 2021.
9 Kimley-Horn and Associates, Project Information for Transportation Studies, Rockefeller - Escaya Industrial Park, 2021.
City of Chula Vista Rockefeller Heritage Industrial Center
Acoustical Assessment
October 2021
Page | 27
and receiver. In addition, not all buildings respond similarly to vibration generated by construction
equipment. For example, for a building that is constructed with reinforced concrete with no plaster, the
FTA guidelines show that a vibration level of up to 0.20 in/sec PPV is considered safe and would not result
in any vibration damage. Human annoyance is evaluated in VdB (the vibration velocity level in decibel
scale) and occurs when construction vibration rises significantly above the threshold of human perception
for extended periods of time. The FTA Transit Noise and Vibration Manual identifies 80 VdB as the
approximate threshold for annoyance.
Table 12: Typical Construction Equipment Vibration Levels, lists vibration levels at 25 feet and 155 feet for
typical construction equipment. Groundborne vibration generated by construction equipment spreads
through the ground and diminishes in magnitude with increases in distance. The nearest sensitive
receptors are the residential uses located approximately 155 feet to the south of the Project site. As
shown in Table 12, construction vibration levels would reach approximately 0.0058 in/sec PPV and 63 VdB
at 155 feet (i.e., the distance to the nearest sensitive receptor) which is below the FTA’s thresholds of 0.20
in/sec PPV and 80 VdB for building damage and human annoyance, respectively. It is also acknowledged
that construction activities would occur throughout the Project site and would not be concentrated at the
point closest to the nearest residential structure(s). Therefore, vibration impacts associated with the
Project construction would be less than significant.
Table 12: Typical Construction Equipment Vibration Levels
Equipment
Peak Particle
Velocity at
25 Feet (in/sec)
Peak Particle
Velocity at
155 Feet (in/sec)1
Approximate VdB
at 25 Feet
Approximate VdB
at 155 Feet2
Large Bulldozer 0.089 0.0058 87 63
Loaded Trucks 0.076 0.0049 86 62
Jackhammer 0.035 0.0023 79 55
Small Bulldozer/Tractors 0.003 0.0002 58 34
Notes:
1. Calculated using the following formula: PPVequip = PPVref x (25/D)1.5, where: PPVequip = the peak particle velocity in in/sec of
the equipment adjusted for the distance; PPVref = the reference vibration level in in/sec from Table 7-4 of the Federal
Transit Administration, Transit Noise and Vibration Impact Assessment Manual, 2018; D = the distance from the equipment
to the receiver.
2. Calculated using the following formula: Lv(D) = Lv(25 feet) - (30 x log10(D/25 feet)) per the FTA Transit Noise and Vibration
Impact Assessment Manual (2018).
Source: Federal Transit Administration, Transit Noise and Vibration Impact Assessment Manual, 2018.
Once operational, the Project would not be a significant source of groundborne vibration. Groundborne
vibration surrounding the Project currently result from heavy-duty vehicular travel (e.g., refuse trucks,
heavy duty trucks, delivery trucks, and transit buses) on the nearby local roadways. Operations of the
proposed Project would include truck deliveries. Due to the rapid drop-off rate of ground-borne vibration
and the short duration of the associated events, vehicular traffic-induced ground-borne vibration is rarely
perceptible beyond the roadway right-of-way, and rarely results in vibration levels that cause damage to
buildings in the vicinity. According to the FTA Transit Noise and Vibration Manual, trucks rarely create
vibration levels that exceed 70 VdB (equivalent to 0.012 inches per second PPV) when they are on
roadways. Therefore, trucks operating at the Project site or along surrounding roadways would not exceed
FTA thresholds for building damage or annoyance. Impacts would be less than significant in this regard.
Mitigation Measures: No mitigation is required.
Level of Significance: Less than significant impact.
City of Chula Vista Rockefeller Heritage Industrial Center
Acoustical Assessment
October 2021
Page | 28
Threshold 6.3 For a project located within the vicinity of a private airstrip or an airport land use plan
or, where such a plan has not been adopted, within two miles of a public airport or
public use airport, would the Project expose people residing or working in the Project
area to excessive noise levels?
The nearest airport to the Project site is the Brown Field Municipal Airport located approximately three
miles to the southeast. Thus, the Project is not within two miles of a public airport or within an airport
land use plan. Additionally, there are no private airstrips located within the Project vicinity. Therefore, the
Project would not expose people residing or working in the Project area to excessive airport- or airstrip-
related noise levels and no mitigation is required.
Mitigation Measures: No mitigation is required.
Level of Significance: Less than significant impact.
City of Chula Vista Rockefeller Heritage Industrial Center
Acoustical Assessment
October 2021
Page | 29
7 REFERENCES
1. California Department of Transportation, Technical Noise Supplement to the Traffic Noise Analysis
Protocol, September 2013.
2. Source: California Department of Transportation, Transportation and Construction Vibration
Guidance Manual, 2013.
3. City of Chula Vista, City of Chula Vista General Plan, 2005.
4. City of Chula Vista, Chula Vista Municipal Code, current through Ordinance 3506, passed July 13, 2021.
5. Elliott H. Berger, Rick Neitzel, and Cynthia A. Kladden, Noise Navigator Sound Level Database with
Over 1700 Measurement Values, 2015.
6. Federal Highway Administration, Highway Traffic Noise Analysis and Abatement Policy and
Guidance, Noise Fundamentals,
https://www.fhwa.dot.gov/environMent/noise/regulations_and_guidance/polguide/polguide02.cf
m, accessed August 12, 2021.
7. Federal Highway Administration, Roadway Construction Noise Model, 2006.
8. Federal Interagency Committee on Noise, Federal Agency Review of Selected Airport Noise Analysis
Issues, August 1992.
9. Federal Transit Administration, Transit Noise and Vibration Impact Assessment Manual, September
2018.
10. Kariel, H. G., Noise in Rural Recreational Environments, Canadian Acoustics 19(5), 3-10, 1991.
11. Kimley-Horn and Associates, Project Information for Transportation Studies, Rockefeller - Escaya
Industrial Park, 2021.
12. San Diego Association of Governments, City of Chula Vista Average Traffic Volumes,
https://www.sandag.org/resources/demographics_and_other_data/transportation/adtv/chulavista
_adt.pdf
Appendix A
NOISE DATA
FHWA Highway Noise Prediction Model (FHWA-RD-77-108) with California Vehicle Noise (CALVENO) Emission Levels
Project Name: Escaya Industrial Park
Project Number: 195034005
Scenario:Existing
Ldn/CNEL:CNEL
Assumed 24-Hour Traffic Distribution: Day Evening Night
Total ADT Volumes 77.70% 12.70% 9.60%
Medium-Duty Trucks 87.43% 5.05% 7.52%
Heavy-Duty Trucks 89.10% 2.84% 8.06%
Vehicle Mix Distance from Centerline of Roadway
Median ADT Speed Alpha Medium Heavy CNEL at Distance to Contour
# Roadway Segment Lanes Width Volume (mph) Factor Trucks Trucks 100 Feet 70 CNEL 65 CNEL 60 CNEL 55 CNEL
1 Heritage Road (E) Palomar St to Olympic Pkwy 6 15 12400 45 0 4.6% 12.3% 69.6 90 285 902 2,853
Page 1
FHWA Highway Noise Prediction Model (FHWA-RD-77-108) with California Vehicle Noise (CALVENO) Emission Levels
Project Name: Escaya Industrial Park
Project Number: 195034005
Scenario:Existing Plus Project
Ldn/CNEL:CNEL
Assumed 24-Hour Traffic Distribution: Day Evening Night
Total ADT Volumes 77.70% 12.70% 9.60%
Medium-Duty Trucks 87.43% 5.05% 7.52%
Heavy-Duty Trucks 89.10% 2.84% 8.06%
Vehicle Mix Distance from Centerline of Roadway
Median ADT Speed Alpha Medium Heavy CNEL at Distance to Contour
# Roadway Segment Lanes Width Volume (mph) Factor Trucks Trucks 100 Feet 70 CNEL 65 CNEL 60 CNEL 55 CNEL
1 Heritage Road (E) Palomar St to Olympic Pkwy 6 15 14,069 45 0 4.6% 12.3% 70.1 102 324 1,024 3,237
Page 1
Noise Measurement Field Data
Project: Job Number:195034005
Site No.: Date:8/17/2021
Analyst: Time:8:59am-9:09am
Location:
Noise Sources:
Results (dBA):
Leq: Lmin: Lmax: Peak:
56.9 49.5 71.8 101.1
Sound Level Meter:LD SoundExpert LxT Temp. (degrees F):75
Calibrator:CAL200 Wind (mph):sw 5 mph
Response Time:Slow Sky:Clear
Weighting:A Bar. Pressure:29.89 in
Microphone Height:5 feet Humidity:68%
Photo:
Equipment Weather
Chula Vista - Escaya Industrial
ST-1
Kiana Graham and Melissa Thayer
880 Energy Way, Chula Vista CA 91911
Car junk yard, passing car traffic, people shouting
Measurement Report
Report Summary
Meter's File Name ART.006.s Computer's File Name LxTse_0005586-20210817 085938-ART.006.ldbin
Meter LxT SE 0005586
Firmware 2.404
User Location
Job Description
Note
Start Time 2021-08-17 08:59:38 Duration 0:10:11.7
End Time 2021-08-17 09:12:07 Run Time 0:10:07.8 Pause Time 0:00:03.9
Results
Overall Metrics
LAeq 56.9 dB
LAE 84.7 dB SEA --- dB
EA 32.9 µPa²h
LApeak 101.1 dB 2021-08-17 08:59:46
LASmax 71.8 dB 2021-08-17 08:59:46
LASmin 49.5 dB 2021-08-17 09:07:42
LAeq 56.9 dB
LCeq 67.4 dB LCeq - LA eq 10.6 dB
LAIeq 61.5 dB LAIeq - LA eq 4.6 dB
Exceedances Count Duration
LAS > 85.0 dB 0 0:00:00.0
LAS > 115.0 dB 0 0:00:00.0
LApeak > 135.0 dB 0 0:00:00.0
LApeak > 137.0 dB 0 0:00:00.0
LApeak > 140.0 dB 0 0:00:00.0
Community Noise LDN LDay LNight
56.9 dB 56.9 dB 0.0 dB
LDEN LDay LEve LNight
56.9 dB 56.9 dB --- dB --- dB
Any Data A C Z
Level Time Stamp Level Time Stamp Level Time Stamp
Leq 56.9 dB 67.4 dB --- dB
Ls(max)71.8 dB 2021-08-17 08:59:46 --- dB --- dB
LS(min)49.5 dB 2021-08-17 09:07:42 --- dB --- dB
LPeak(max)101.1 dB 2021-08-17 08:59:46 --- dB --- dB
Overloads Count Duration OBA Count OBA Duration
0 0:00:00.0 0 0:00:00.0
Statistics
LAS 5.0 61.3 dB
LAS 10.0 60.2 dB
LAS 33.3 55.8 dB
LAS 50.0 54.8 dB
LAS 66.6 53.5 dB
LAS 90.0 51.4 dB
Noise Measurement Field Data
Project: Job Number:195034005
Site No.: Date:8/17/2021
Analyst: Time:9:13am-9:23am
Location:
Noise Sources:
Results (dBA):
Leq: Lmin: Lmax: Peak:
63.6 44.3 77.5 92.0
Sound Level Meter:LD SoundExpert LxT Temp. (degrees F):75
Calibrator:CAL200 Wind (mph):sw 5 mph
Response Time:Slow Sky:Clear
Weighting:A Bar. Pressure:29.89 in
Microphone Height:5 feet Humidity:68%
Photo:
Equipment Weather
Chula Vista - Escaya Industrial
ST-2
Kiana Graham and Melissa Thayer
Corner of Heritage Rd and Santa Maya
Cars passing by on Heritage Rd., sprinklers, pedestrians
Measurement Report
Report Summary
Meter's File Name ART.007.s Computer's File Name LxTse_0005586-20210817 091302-ART.007.ldbin
Meter LxT SE 0005586
Firmware 2.404
User Location
Job Description
Note
Start Time 2021-08-17 09:13:02 Duration 0:10:03.4
End Time 2021-08-17 09:31:08 Run Time 0:10:03.4 Pause Time 0:00:00.0
Results
Overall Metrics
LAeq 63.6 dB
LAE 91.4 dB SEA --- dB
EA 152.2 µPa²h
LApeak 92.0 dB 2021-08-17 09:29:56
LASmax 77.5 dB 2021-08-17 09:21:08
LASmin 44.3 dB 2021-08-17 09:25:19
LAeq 63.6 dB
LCeq 70.7 dB LCeq - LA eq 7.1 dB
LAIeq 65.5 dB LAIeq - LA eq 1.9 dB
Exceedances Count Duration
LAS > 85.0 dB 0 0:00:00.0
LAS > 115.0 dB 0 0:00:00.0
LApeak > 135.0 dB 0 0:00:00.0
LApeak > 137.0 dB 0 0:00:00.0
LApeak > 140.0 dB 0 0:00:00.0
Community Noise LDN LDay LNight
63.6 dB 63.6 dB 0.0 dB
LDEN LDay LEve LNight
63.6 dB 63.6 dB --- dB --- dB
Any Data A C Z
Level Time Stamp Level Time Stamp Level Time Stamp
Leq 63.6 dB 70.7 dB --- dB
Ls(max)77.5 dB 2021-08-17 09:21:08 --- dB --- dB
LS(min)44.3 dB 2021-08-17 09:25:19 --- dB --- dB
LPeak(max)92.0 dB 2021-08-17 09:29:56 --- dB --- dB
Overloads Count Duration OBA Count OBA Duration
0 0:00:00.0 0 0:00:00.0
Statistics
LAS 5.0 69.8 dB
LAS 10.0 67.4 dB
LAS 33.3 60.6 dB
LAS 50.0 57.2 dB
LAS 66.6 54.3 dB
LAS 90.0 49.7 dB
Noise Measurement Field Data
Project: Job Number:195034005
Site No.: Date:8/17/2021
Analyst: Time:9:51am-10:01am
Location:
Noise Sources:
Results (dBA):
Leq: Lmin: Lmax: Peak:
64.5 51.3 71.5 84.0
Sound Level Meter:LD SoundExpert LxT Temp. (degrees F):75
Calibrator:CAL200 Wind (mph):sw 5 mph
Response Time:Slow Sky:Clear
Weighting:A Bar. Pressure:29.89 in
Microphone Height:5 feet Humidity:68%
Photo:
Equipment Weather
Chula Vista - Escaya Industrial
ST-3
Kiana Graham and Melissa Thayer
Corner of Paseo Lugo and Camino Marcela
residential traffic, leaf blower/ landscaping, cars, pedestrians
Measurement Report
Report Summary
Meter's File Name ART.009.s Computer's File Name LxTse_0005586-20210817 095128-ART.009.ldbin
Meter LxT SE 0005586
Firmware 2.404
User Location
Job Description
Note
Start Time 2021-08-17 09:51:28 Duration 0:10:00.0
End Time 2021-08-17 10:01:28 Run Time 0:10:00.0 Pause Time 0:00:00.0
Results
Overall Metrics
LAeq 64.5 dB
LAE 92.3 dB SEA --- dB
EA 188.1 µPa²h
LApeak 84.0 dB 2021-08-17 09:54:23
LASmax 71.5 dB 2021-08-17 09:53:39
LASmin 51.3 dB 2021-08-17 09:58:46
LAeq 64.5 dB
LCeq 71.4 dB LCeq - LA eq 6.9 dB
LAIeq 65.4 dB LAIeq - LA eq 0.9 dB
Exceedances Count Duration
LAS > 85.0 dB 0 0:00:00.0
LAS > 115.0 dB 0 0:00:00.0
LApeak > 135.0 dB 0 0:00:00.0
LApeak > 137.0 dB 0 0:00:00.0
LApeak > 140.0 dB 0 0:00:00.0
Community Noise LDN LDay LNight
64.5 dB 64.5 dB 0.0 dB
LDEN LDay LEve LNight
64.5 dB 64.5 dB --- dB --- dB
Any Data A C Z
Level Time Stamp Level Time Stamp Level Time Stamp
Leq 64.5 dB 71.4 dB --- dB
Ls(max)71.5 dB 2021-08-17 09:53:39 --- dB --- dB
LS(min)51.3 dB 2021-08-17 09:58:46 --- dB --- dB
LPeak(max)84.0 dB 2021-08-17 09:54:23 --- dB --- dB
Overloads Count Duration OBA Count OBA Duration
0 0:00:00.0 0 0:00:00.0
Statistics
LAS 5.0 69.1 dB
LAS 10.0 68.5 dB
LAS 33.3 65.0 dB
LAS 50.0 62.9 dB
LAS 66.6 58.6 dB
LAS 90.0 55.1 dB
Noise Measurement Field Data
Project: Job Number:195034005
Site No.: Date:8/17/2021
Analyst: Time:9:37am-9:47am
Location:
Noise Sources:
Results (dBA):
Leq: Lmin: Lmax: Peak:
49.6 41.0 60.2 78.1
Sound Level Meter:LD SoundExpert LxT Temp. (degrees F):75
Calibrator:CAL200 Wind (mph):sw 5 mph
Response Time:Slow Sky:Clear
Weighting:A Bar. Pressure:29.89 in
Microphone Height:5 feet Humidity:68%
Photo:
Equipment Weather - 8/17/21
Chula Vista - Escaya Industrial
ST-4
Kiana Graham and Melissa Thayer
Along Caminito Aldea and Avenida Senecio next to Escaya Park
pedestrians, slow moving cars
Measurement Report
Report Summary
Meter's File Name ART.008.s Computer's File Name LxTse_0005586-20210817 093745-ART.008.ldbin
Meter LxT SE 0005586
Firmware 2.404
User Location
Job Description
Note
Start Time 2021-08-17 09:37:45 Duration 0:10:00.0
End Time 2021-08-17 09:47:45 Run Time 0:10:00.0 Pause Time 0:00:00.0
Results
Overall Metrics
LAeq 49.6 dB
LAE 77.4 dB SEA --- dB
EA 6.1 µPa²h
LApeak 78.1 dB 2021-08-17 09:47:42
LASmax 60.2 dB 2021-08-17 09:42:42
LASmin 41.0 dB 2021-08-17 09:38:12
LAeq 49.6 dB
LCeq 65.5 dB LCeq - LA eq 15.9 dB
LAIeq 54.0 dB LAIeq - LA eq 4.4 dB
Exceedances Count Duration
LAS > 85.0 dB 0 0:00:00.0
LAS > 115.0 dB 0 0:00:00.0
LApeak > 135.0 dB 0 0:00:00.0
LApeak > 137.0 dB 0 0:00:00.0
LApeak > 140.0 dB 0 0:00:00.0
Community Noise LDN LDay LNight
49.6 dB 49.6 dB 0.0 dB
LDEN LDay LEve LNight
49.6 dB 49.6 dB --- dB --- dB
Any Data A C Z
Level Time Stamp Level Time Stamp Level Time Stamp
Leq 49.6 dB 65.5 dB --- dB
Ls(max)60.2 dB 2021-08-17 09:42:42 --- dB --- dB
LS(min)41.0 dB 2021-08-17 09:38:12 --- dB --- dB
LPeak(max)78.1 dB 2021-08-17 09:47:42 --- dB --- dB
Overloads Count Duration OBA Count OBA Duration
0 0:00:00.0 0 0:00:00.0
Statistics
LAS 5.0 53.4 dB
LAS 10.0 52.5 dB
LAS 33.3 49.8 dB
LAS 50.0 48.0 dB
LAS 66.6 46.7 dB
LAS 90.0 45.1 dB
Noise Measurement Field Data
Project: Job Number:195034005
Site No.: Date:8/17/2021-8/18/2021
Analyst: Time:10:20am
Location:
Noise Sources:
Comments:
Results (dBA):
Leq: Lmin: Lmax: Peak:
54.5 29.4 84.2 99.5
Sound Level Meter:LD SoundExpert LxT Temp. (degrees F):75
Calibrator:CAL200 Wind (mph):sw 5 mph
Response Time:Slow Sky:Clear
Weighting:A Bar. Pressure:29.89 in
Microphone Height:5 feet Humidity:68%
Photo:
Equipment Weather - 8/17/21
Chula Vista - Escaya Industrial
LT-1
Kiana Graham and Melissa Thayer
Culdesac of Paseo Lugo
Cars passing by on Herritage Rd., Residential noises (people, cars, garbage truck)
24-hour measurement
Measurement Report
Report Summary
Meter's File Name LB.002.s Computer's File Name LxTse_0005586-20210817 101902-LB.002.ldbin
Meter LxT SE 0005586
Firmware 2.404
User Location
Job Description
Note
Start Time 2021-08-17 10:19:02 Duration 24:00:02.9
End Time 2021-08-18 10:19:05 Run Time 24:00:02.9 Pause Time 0:00:00.0
Results
Overall Metrics
LAeq 54.5 dB
LAE 103.8 dB SEA --- dB
EA 2.7 mPa²h
LApeak 99.5 dB 2021-08-17 18:41:49
LASmax 84.2 dB 2021-08-18 06:55:07
LASmin 29.4 dB 2021-08-18 03:37:00
LAeq 54.5 dB
LCeq 67.3 dB LCeq - LA eq 12.8 dB
LAIeq 56.6 dB LAIeq - LA eq 2.2 dB
Exceedances Count Duration
LAS > 85.0 dB 0 0:00:00.0
LAS > 115.0 dB 0 0:00:00.0
LApeak > 135.0 dB 0 0:00:00.0
LApeak > 137.0 dB 0 0:00:00.0
LApeak > 140.0 dB 0 0:00:00.0
Community Noise LDN LDay LNight
58.3 dB 55.7 dB 0.0 dB
LDEN LDay LEve LNight
58.6 dB 56.3 dB 52.2 dB 50.7 dB
Any Data A C Z
Level Time Stamp Level Time Stamp Level Time Stamp
Leq 54.5 dB 67.3 dB --- dB
Ls(max)84.2 dB 2021-08-18 06:55:07 --- dB --- dB
LS(min)29.4 dB 2021-08-18 03:37:00 --- dB --- dB
LPeak(max)99.5 dB 2021-08-17 18:41:49 --- dB --- dB
Overloads Count Duration OBA Count OBA Duration
0 0:00:00.0 0 0:00:00.0
Statistics
LAS 5.0 59.3 dB
LAS 10.0 57.1 dB
LAS 33.3 51.7 dB
LAS 50.0 48.7 dB
LAS 66.6 44.5 dB
LAS 90.0 36.1 dB
Roadway Construction Noise Model (RCNM),Version 1.1
Report date: 08/27/2021
Case Description: Site Preparation
**** Receptor #1 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Commercial - E Commercial 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Dozer No 40 81.7 50.0 0.0
Concrete Saw No 20 89.6 50.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Dozer 81.7 77.7 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Concrete Saw 89.6 82.6 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 89.6 83.8 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #2 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
SF Residential - S Residential 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Dozer No 40 81.7 155.0 0.0
Concrete Saw No 20 89.6 155.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Dozer 71.8 67.9 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Concrete Saw 79.8 72.8 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 79.8 74.0 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #3 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Industrial - W Industrial 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Dozer No 40 81.7 30.0 0.0
Concrete Saw No 20 89.6 30.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Dozer 86.1 82.1 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Concrete Saw 94.0 87.0 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 94.0 88.2 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #4 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Commercial 0.0 0.0 0.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Dozer No 40 81.7 225.0 0.0
Concrete Saw No 20 89.6 225.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Dozer 68.6 64.6 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Concrete Saw 76.5 69.5 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 76.5 70.7 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #5 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Industrial - SW Industrial 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Dozer No 40 81.7 310.0 0.0
Concrete Saw No 20 89.6 310.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Dozer 65.8 61.8 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Concrete Saw 73.7 66.7 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 73.7 68.0 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Roadway Construction Noise Model (RCNM),Version 1.1
Report date: 08/27/2021
Case Description: Grading
**** Receptor #1 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Commercial - E Residential 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Dozer No 40 81.7 50.0 0.0
Grader No 40 85.0 50.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Dozer 81.7 77.7 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Grader 85.0 81.0 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 85.0 82.7 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #2 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
SF Residential - S Residential 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Dozer No 40 81.7 155.0 0.0
Grader No 40 85.0 155.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Dozer 71.8 67.9 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Grader 75.2 71.2 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 75.2 72.9 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #3 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Industrial - W Industrial 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Dozer No 40 81.7 30.0 0.0
Grader No 40 85.0 30.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Dozer 86.1 82.1 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Grader 89.4 85.5 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 89.4 87.1 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #4 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Commercial 0.0 0.0 0.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Dozer No 40 81.7 225.0 0.0
Grader No 40 85.0 225.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Dozer 68.6 64.6 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Grader 71.9 68.0 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 71.9 69.6 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #5 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Industrial - SW Industrial 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Dozer No 40 81.7 310.0 0.0
Grader No 40 85.0 310.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Dozer 65.8 61.8 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Grader 69.2 65.2 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 69.2 66.8 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Roadway Construction Noise Model (RCNM),Version 1.1
Report date: 08/27/2021
Case Description: Building Construction
**** Receptor #1 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Commerical - E Commercial 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Crane No 16 80.6 55.0 0.0
Tractor No 40 84.0 55.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Crane 79.7 71.8 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Tractor 83.2 79.2 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 83.2 79.9 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #2 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
SF Residential - S Residential 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Crane No 16 80.6 155.0 0.0
Tractor No 40 84.0 155.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Crane 70.7 62.8 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Tractor 74.2 70.2 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 74.2 70.9 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #3 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Industrial - W Industrial 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Crane No 16 80.6 30.0 0.0
Tractor No 40 84.0 30.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Crane 85.0 77.0 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Tractor 88.4 84.5 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 88.4 85.2 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #4 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Commercial 0.0 0.0 0.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Crane No 16 80.6 225.0 0.0
Tractor No 40 84.0 225.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Crane 67.5 59.5 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Tractor 70.9 67.0 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 70.9 67.7 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #5 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Industrial - SW Industrial 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Crane No 16 80.6 310.0 0.0
Tractor No 40 84.0 310.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Crane 64.7 56.7 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Tractor 68.2 64.2 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 68.2 64.9 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Roadway Construction Noise Model (RCNM),Version 1.1
Report date: 08/27/2021
Case Description: Paving
**** Receptor #1 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Commercial - E Commercial 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Paver No 50 77.2 50.0 0.0
Roller No 20 80.0 50.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Paver 77.2 74.2 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Roller 80.0 73.0 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 80.0 76.7 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #2 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
SF Residential - S Residential 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Paver No 50 77.2 155.0 0.0
Roller No 20 80.0 155.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Paver 67.4 64.4 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Roller 70.2 63.2 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 70.2 66.8 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #3 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Industrial - W Industrial 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Paver No 50 77.2 30.0 0.0
Roller No 20 80.0 30.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Paver 81.7 78.6 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Roller 84.4 77.4 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 84.4 81.1 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Roadway Construction Noise Model (RCNM),Version 1.1
Report date: 08/27/2021
Case Description: Architectural Coating
**** Receptor #1 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Commercial - E Commercial 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Compressor (air) No 40 77.7 50.0 0.0
Compressor (air) No 40 77.7 50.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Compressor (air) 77.7 73.7 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Compressor (air) 77.7 73.7 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 77.7 76.7 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #2 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
SF Residential - S Residential 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Compressor (air) No 40 77.7 155.0 0.0
Compressor (air) No 40 77.7 155.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Compressor (air) 67.8 63.9 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Compressor (air) 67.8 63.9 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 67.8 66.9 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #3 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Industrial - W Industrial 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Compressor (air) No 40 77.7 30.0 0.0
Compressor (air) No 40 77.7 30.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Compressor (air) 82.1 78.1 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Compressor (air) 82.1 78.1 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 82.1 81.1 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #4 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Commercial 0.0 0.0 0.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Compressor (air) No 40 77.7 225.0 0.0
Compressor (air) No 40 77.7 225.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Compressor (air) 64.6 60.6 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Compressor (air) 64.6 60.6 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 64.6 63.6 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
**** Receptor #5 ****
Baselines (dBA)
Description Land Use Daytime Evening Night
----------- -------- ------- ------- -----
Industrial - SW Industrial 1.0 1.0 1.0
Equipment
---------
Spec Actual Receptor Estimated
Impact Usage Lmax Lmax Distance Shielding
Description Device (%) (dBA) (dBA) (feet) (dBA)
----------- ------ ----- ----- ----- -------- ---------
Compressor (air) No 40 77.7 310.0 0.0
Compressor (air) No 40 77.7 310.0 0.0
Results
-------
Noise Limits (dBA)
Noise Limit Exceedance (dBA)
----------------------------------------------
----------------------------------------------
Calculated (dBA) Day Evening
Night Day Evening Night
---------------- -------------- -------------
-------------- -------------- -------------- --------------
Equipment Lmax Leq Lmax Leq Lmax Leq Lmax
Leq Lmax Leq Lmax Leq Lmax Leq
---------------------- ------ ------ ------ ------ ------ ------ ------
------ ------ ------ ------ ------ ------ ------
Compressor (air) 61.8 57.8 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Compressor (air) 61.8 57.8 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Total 61.8 60.9 N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
Traffic values ControlConstr.Affect.Gradient
Station ADT Vehicles type Vehicle name day night Speed deviceSpeedveh.Road surface Min / Max
km Veh/24h Veh/h Veh/h km/h km/h %%
Driveway 1 Traffic direction: In entry direction
0+000 1776 Total
Automobiles
Medium trucks
Heavy trucks
Buses
Motorcycles
Auxiliary vehicle
-
-
-
-
-
-
-
74
62
5
7
-
-
-
74
62
5
7
-
-
-
-
24
24
24
-
-
-
none --Average (of DGAC and PCC)-4.6 / 0.0
Driveway 2 Traffic direction: In entry direction
0+000 888 Total
Automobiles
Medium trucks
Heavy trucks
Buses
Motorcycles
Auxiliary vehicle
-
-
-
-
-
-
-
37
31
2
4
-
-
-
37
31
2
4
-
-
-
-
24
24
24
-
-
-
none --Average (of DGAC and PCC)0.0 / 1.8
Bldg 1-1 Traffic direction: In entry direction
0+000 840 Total
Automobiles
Medium trucks
Heavy trucks
Buses
Motorcycles
Auxiliary vehicle
-
-
-
-
-
-
-
35
25
4
6
-
-
-
35
25
4
6
-
-
-
-
24
24
24
-
-
-
none --Average (of DGAC and PCC)0.0
Bldg 1-2 Traffic direction: In entry direction
0+000 600 Total
Automobiles
Medium trucks
Heavy trucks
Buses
Motorcycles
Auxiliary vehicle
-
-
-
-
-
-
-
25
25
-
-
-
-
-
25
25
-
-
-
-
-
-
24
24
24
-
-
-
none --Average (of DGAC and PCC)0.0
0+162 375 Total
Automobiles
Medium trucks
Heavy trucks
Buses
Motorcycles
Auxiliary vehicle
-
-
-
-
-
-
-
25
25
-
-
-
-
-
-
-
-
-
-
-
-
-
24
24
24
-
-
-
none --Average (of DGAC and PCC)0.0
Bldg 1-3 Traffic direction: In entry direction
0+000 600 Total
Automobiles
Medium trucks
Heavy trucks
Buses
Motorcycles
Auxiliary vehicle
-
-
-
-
-
-
-
25
25
-
-
-
-
-
25
25
-
-
-
-
-
-
24
24
24
-
-
-
none --Average (of DGAC and PCC)-1.3 / 2.7
Bldg 2-1 Traffic direction: In entry direction
0+000 360 Total
Automobiles
Medium trucks
Heavy trucks
Buses
Motorcycles
Auxiliary vehicle
-
-
-
-
-
-
-
15
13
1
1
-
-
-
15
13
1
1
-
-
-
-
24
24
24
-
-
-
none --Average (of DGAC and PCC)3.3
Noise emissions of road traffic
Kimely Horn 1100 W. Town and Country Road, Suite 700 Orange, CA 92868 USA
Traffic values ControlConstr.Affect.Gradient
Station ADT Vehicles type Vehicle name day night Speed deviceSpeedveh.Road surface Min / Max
km Veh/24h Veh/h Veh/h km/h km/h %%
Bldg 2-2 Traffic direction: In entry direction
0+000 48 Total
Automobiles
Medium trucks
Heavy trucks
Buses
Motorcycles
Auxiliary vehicle
-
-
-
-
-
-
-
2
-
1
1
-
-
-
2
-
1
1
-
-
-
-
-
24
24
-
-
-
none --Average (of DGAC and PCC)1.8
Bldg 2-3 Traffic direction: In entry direction
0+000 312 Total
Automobiles
Medium trucks
Heavy trucks
Buses
Motorcycles
Auxiliary vehicle
-
-
-
-
-
-
-
13
13
-
-
-
-
-
13
13
-
-
-
-
-
-
24
-
-
-
-
-
none --Average (of DGAC and PCC)-2.1 / 0.4
Bldg 2-4 Traffic direction: In entry direction
0+000 312 Total
Automobiles
Medium trucks
Heavy trucks
Buses
Motorcycles
Auxiliary vehicle
-
-
-
-
-
-
-
13
13
-
-
-
-
-
13
13
-
-
-
-
-
-
24
-
-
-
-
-
none --Average (of DGAC and PCC)1.8
Bldg 3-1 Traffic direction: In entry direction
0+064 72 Total
Automobiles
Medium trucks
Heavy trucks
Buses
Motorcycles
Auxiliary vehicle
-
-
-
-
-
-
-
3
-
1
2
-
-
-
3
-
1
2
-
-
-
-
-
24
24
-
-
-
none --Average (of DGAC and PCC)1.6 / 3.6
Bldg 3-2 Traffic direction: In entry direction
0+064 456 Total
Automobiles
Medium trucks
Heavy trucks
Buses
Motorcycles
Auxiliary vehicle
-
-
-
-
-
-
-
19
19
-
-
-
-
-
19
19
-
-
-
-
-
-
24
-
-
-
-
-
none --Average (of DGAC and PCC)0.0 / 4.4
Noise emissions of road traffic
Kimely Horn 1100 W. Town and Country Road, Suite 700 Orange, CA 92868 USA
Frequency spectrum [dB(A)]Corrections
Source name Reference Level 500 Cwall CI CT
dB(A)Hz dB dB dB
Truck Loading - Bldg 1 Lw/unit Day 95.8 95.8 ---
Night 95.8 95.8 ---
Truck Loading - Bldg 2 - W Lw/unit Day 95.8 95.8 ---
Night 95.8 95.8 ---
Truck Loading - Bldg 2 - E Lw/unit Day 95.8 95.8 ---
Night 95.8 95.8 ---
Truck Loading - Bldg 3 Lw/unit Day 95.8 95.8 ---
Night 95.8 95.8 ---
HVAC - 1 Lw/unit Day 91.7 91.7 ---
Night 91.7 91.7 ---
HVAC - 2 Lw/unit Day 91.7 91.7 ---
Night 91.7 91.7 ---
HVAC - 3 Lw/unit Day 91.7 91.7 ---
Night 91.7 91.7 ---
HVAC - 4 Lw/unit Day 91.7 91.7 ---
Night 91.7 91.7 ---
HVAC - 5 Lw/unit Day 91.7 91.7 ---
Night 91.7 91.7 ---
HVAC - 6 Lw/unit Day 91.7 91.7 ---
Night 91.7 91.7 ---
HVAC - 7 Lw/unit Day 91.7 91.7 ---
Night 91.7 91.7 ---
HVAC - 8 Lw/unit Day 91.7 91.7 ---
Night 91.7 91.7 ---
HVAC - 9 Lw/unit Day 91.7 91.7 ---
Night 91.7 91.7 ---
HVAC - 10 Lw/unit Day 91.7 91.7 ---
Night 91.7 91.7 ---
HVAC - 11 Lw/unit Day 91.7 91.7 ---
Night 91.7 91.7 ---
HVAC - 12 Lw/unit Day 91.7 91.7 ---
Night 91.7 91.7 ---
HVAC - 13 Lw/unit Day 91.7 91.7 ---
Night 91.7 91.7 ---
HVAC - 14 Lw/unit Day 91.7 91.7 ---
Night 91.7 91.7 ---
HVAC - 15 Lw/unit Day 91.7 91.7 ---
Night 91.7 91.7 ---
HVAC - 16 Lw/unit Day 91.7 91.7 ---
Night 91.7 91.7 ---
HVAC - 17 Lw/unit Day 91.7 91.7 ---
Night 91.7 91.7 ---
Noise emissions of industry sources
Kimely Horn 1100 W. Town and Country Road, Suite 700 Orange, CA 92868 USA
X Y Day Night
1.Fl 39.2 39.2
2.Fl 39.6 39.6
1.Fl 39.5 39.5
2.Fl 39.9 39.9
1.Fl 39.6 39.6
2.Fl 39.9 39.9
1.Fl 42.5 42.5
2.Fl 42.9 42.9
1.Fl 43.3 43.3
2.Fl 43.8 43.8
1.Fl 43.8 43.8
2.Fl 44.5 44.5
1.Fl 45.3 45.3
2.Fl 46.2 46.2
1.Fl 46.8 46.8
2.Fl 47.8 47.8
1.Fl 48.6 48.6
2.Fl 49.6 49.6
1.Fl 48.4 48.4
2.Fl 49.1 49.1
1.Fl 48.0 48.0
2.Fl 48.8 48.8
1.Fl 48.5 48.5
2.Fl 49.3 49.3
1.Fl 49.6 49.6
2.Fl 49.9 49.9
1.Fl 47.1 47.1
2.Fl 47.3 47.3
1.Fl 45.5 45.5
2.Fl 45.8 45.8
1.Fl 44.3 44.3
2.Fl 44.5 44.5
1.Fl 44.0 44.0
2.Fl 44.3 44.3
1.Fl 41.1 41.1
2.Fl 41.5 41.5
1.Fl 40.6 40.6
2.Fl 41.3 41.3
1.Fl 41.1 41.1
2.Fl 41.3 41.3
3606429.17499486.97
3606394.69499498.66
Receiver Results
3606545.05499480.03
3606508.16499475.74
3606461.84499476.68
3606638.88499508.45
3606607.36499495.85
3606575.9499488.06
3606715.99499567.73
3606692499550.74
3606663.69499523.79
3606804.67499700.25
3606754.75499632.87
3606735.9499589.32
3606886.26499808.26
3606862.7499774.89
3606836.2499737.87
6
5
4
3
3606948.14499906.86
3606930.13499879.72
3606909.84499848.02
12
11
10
9
8
7
2
1
20
19
18
17
16
15
14
13
Coordinates
Receiver No.
in meter dB(A)
Level w/o NP
Floor