Environmental Noise Study for the Proposed Westlake Village

Transcription

WIELAND ACOUSTICS, INC.
1371 Warner Avenue, Suite A
Tustin, CA 92780
Tel: 949.474.1222
www.wielandacoustics.com
Environmental Noise Study for the Proposed
Westlake Village Community Park/Triunfo YMCA
in the City of Westlake Village
Project File 09.031.01
September 18, 2012
Prepared for:
Willdan
13191 Crossroads Parkway North, Suite 405
Industry, CA 91746
Prepared by:
Jonathan Higginson, Senior Consultant
WILLDAN
Project File 09.031.01 – FINAL
Table of Contents
1
INTRODUCTION/PROJECT DESCRIPTION ...............................................................................1
2
FUNDAMENTALS OF SOUND ................................................................................................4
3
NOISE DESCRIPTORS ............................................................................................................4
3.1
3.2
3.3
3.4
4
DECIBELS.................................................................................................................................. 4
A-WEIGHTING .......................................................................................................................... 5
EQUIVALENT SOUND LEVEL (LEQ) .................................................................................................. 5
DAY-NIGHT SOUND LEVEL (LDN) ................................................................................................... 5
NOISE CRITERIA ...................................................................................................................7
4.1
4.2
4.3
CITY OF WESTLAKE VILLAGE MUNICIPAL CODE ............................................................................... 7
CITY OF WESTLAKE VILLAGE GENERAL PLAN................................................................................... 7
CALIFORNIA GREEN BUILDING STANDARDS CODE (CALGREEN) ......................................................... 8
5
THRESHOLDS OF SIGNIFICANCE ............................................................................................9
6
EXISTING NOISE ENVIRONMENT ......................................................................................... 10
6.1
6.2
7
NOISE MEASUREMENTS ............................................................................................................ 11
TRAFFIC ................................................................................................................................. 13
FUTURE CONDITIONS WITH PROJECT ................................................................................. 14
7.1
PROJECT CONSTRUCTION .......................................................................................................... 14
7.2
PROJECT OPERATION................................................................................................................ 18
7.2.1
Traffic ......................................................................................................................... 19
7.2.2
Park Activities ............................................................................................................. 21
8
SUMMARY OF IMPACTS ..................................................................................................... 24
9
MITIGATION MEASURES .................................................................................................... 24
10
REFERENCES ...................................................................................................................... 25
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List of Tables
Table 4-1.
Table 4-2.
Table 6-1.
Table 6-2.
Table 7-1.
Table 7-2.
Table 7-3.
Table 7-4.
Table 8-1.
General Plan Exterior Noise Standards................................................................................. 7
General Plan Construction Noise Standards......................................................................... 8
Summary of Noise Measurements ..................................................................................... 13
Existing Traffic Noise Levels ................................................................................................ 14
Analysis of Estimated Equipment Sound Power Levels During Each Construction Phase . 16
Near-Term With Project vs. Existing Traffic Noise Levels ................................................... 19
Future With Project vs. Future Without Project Traffic Noise Levels................................. 20
Summary of Estimated Noise Levels Due to Project Operations ....................................... 22
Summary of Impacts ........................................................................................................... 24
List of Figures
Figure 1-1.
Figure 1-2.
Figure 3-1.
Figure 3-2.
Figure 6-1.
Figure 7-1.
Figure 7-2.
Location of Project Site ....................................................................................................... 1
Project Site Plan................................................................................................................... 3
Common Noise Sources and A-Weighted Noise Levels ...................................................... 6
Common Ldn Noise Exposure Levels at Various Locations................................................... 6
Noise Measurement Locations.......................................................................................... 12
Estimated Worst Case Construction Noise Levels ............................................................. 17
Estimated Worst Case Park Activity Noise Levels ............................................................. 23
List of Appendices
Appendix I.
Appendix II.
Noise Measurements
Traffic Noise Analysis
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1 Introduction/Project Description
The purpose of this study is to identify and assess the potential noise impacts associated with the
construction and operation of the Westlake Village Community Park/Triunfo YMCA (Project) in the
City of Westlake Village. Refer to Figure 1-1 for the location of the Project site. Figure 1-2 provides
the proposed site plan.
Figure 1-1. Location of Project Site
The Project will be located on an approximately 18 acre site and will feature a YMCA building and a
park. The YMCA building will contain a natatorium with two pools, a gymnasium, a fitness center,
multipurpose rooms, activity rooms, locker rooms and restrooms, childcare facilities, a learning
center, a cafeteria and other auxiliary spaces (reception, offices, storage rooms, mechanical
equipment room, etc.). Surrounding the building will be a park that includes:
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Multi-use sports fields. Three lighted soccer fields on the east end and three lighted
softball/baseball fields (including a specialized need field) on the west end. The softball/baseball
fields will also incorporate soccer overlays.
A skateboard park.
Batting cages.
Two restroom/concession facilities.
Outdoor basketball (basketball standards in the parking lot).
Portable volleyball nets to be temporarily placed in the instructional court.
One-mile pedestrian running/walking trail around the entire site with exercise stations located
next to the trail.
Children’s play area with tot lot.
Picnic tables and barbeques, gazebos and arbors, a group picnic shelter, open grass areas, a
garden, park benches, site landscaping, sidewalks/pedestrian walkways, and security lighting.
Parking lots, including a park and ride lot.
The Park hours of operation will be 6:00 a.m. to 10:00 p.m. from October through May and 6:00
a.m. to 10:30 p.m. from June through September. The sports field lights will be turned off by 9:00
p.m. except for emergency situations. The YMCA will be open from 5:30 a.m. to 10:00 p.m. Monday
through Friday, and 7:00 a.m. to 9:00 p.m. Saturday and Sunday.
Infrastructure improvements including rough grading and installation of utilities and irrigation
systems have already been completed at the site. The rough grading included the construction of an
earthen berm at the east end of the Project site (next to the soccer fields) that will act as a barrier to
noise propagating to the east. The construction activities associated with this completed work are
not addressed or analyzed in this study. However, there are a number of construction phases that
are still to be completed. These future phases, which are analyzed in this study, include:
Excess dirt removal;
Precise grading;
Building construction;
Architectural coating; and,
Asphalt paving.
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Figure 1-2. Project Site Plan
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2 Fundamentals of Sound
Sound may be thought of as mechanical energy of a vibrating object transmitted by pressure waves
through a medium to the human ear. The medium of main concern for environmental noise is air.
Noise is most simply defined as unwanted sound.
In its most basic form a sound can be described by its frequency and its amplitude. As a sound wave
propagates past a point in the air it causes the air to alternate from a state of compression to a state
of rarefaction. The number of times per second that the wave passes from a state of maximum
compression through a state of rarefaction and back to a state of maximum compression is the
frequency. The amplitude describes the maximum pressure disturbance caused by the wave; that is,
the difference between the “resting” pressure in the air when no sound is present and the pressure
during the state of maximum compression or rarefaction caused by the sound wave.
Frequency is expressed in cycles per second, or Hertz (Hz). One Hertz equals one cycle per second.
High frequencies are sometimes more conveniently expressed in units of kilohertz (kHz) or
thousands of Hertz. The extreme range of frequencies that can be heard by the healthiest human
ear spans from 16 to 20 Hz on the low end to about 20,000 Hz on the high end. Frequencies are
heard as the pitch or tone of sound. High frequencies produce high-pitched sounds; low frequencies
produce low-pitched sounds. Very-low frequency airborne sound of sufficient amplitude may be felt
before it can be heard, and can be confused with ground-borne vibration.
For any given frequency, an increase in amplitude correlates to an increase in loudness and a
decrease in amplitude correlates to a decrease in loudness. The measurement and description of
amplitude is discussed further in Section 3.
3 Noise Descriptors
The following sections describe the noise descriptors that will be used throughout this study:
3.1 Decibels
The magnitude of a sound is typically described in terms of sound pressure level (SPL) which refers
to the root-mean-square (RMS) pressure of a sound wave and can be measured in units called
microPascals (µPa). However, expressing sound pressure levels in terms of µPa would be very
cumbersome since it would require a very wide range of numbers. For this reason, sound pressure
levels are stated in terms of decibels, abbreviated dB. The decibel is a logarithmic unit that describes
the ratio of the actual sound pressure to a reference pressure (20 µPa is the standard reference
pressure level for acoustical measurements in air). Specifically, a sound pressure level, in decibels, is
calculated as follows:
 X 
SPL = 20 log10 
 ,
 20 µPa 
where X is the actual sound pressure and 20 µPa is the reference pressure.
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Since decibels are logarithmic units, sound pressure levels cannot be added or subtracted by
ordinary arithmetic means. For example, if one automobile produces a sound pressure level of 70 dB
when it passes an observer, two cars passing simultaneously would not produce 140 dB. In fact, they
would combine to produce 73 dB.
3.2 A-Weighting
While sound pressure level defines the amplitude of a sound, this alone is not a reliable indicator of
loudness. Human perception of loudness depends on the characteristics of the human ear. In
particular, the frequency or pitch of a sound has a substantial effect on how humans will respond.
Human hearing is limited not only to the range of audible frequencies, but also in the way it
perceives sound pressure levels within that range. In general, the healthy human ear is most
sensitive to sounds between 1,000 Hz and 5,000 Hz, and perceives both higher and lower frequency
sounds of the same magnitude as being less loud. In order to better relate noise to the frequency
response of the human ear, a frequency-dependent rating scale, known as the A-Scale, is used to
adjust (or “weight”) the sound level measured by a sound level meter. The resulting sound pressure
level is expressed in A-weighted decibels or dBA. When people make relative judgments of the
loudness or annoyance of most ordinary everyday sounds, their judgments correlate well with the Aweighted sound levels of those sounds. A range of noise levels associated with common indoor and
outdoor activities is shown in Figure 3-1.
3.3 Equivalent Sound Level (Leq)
Many noise sources produce levels that fluctuate over time; examples include mechanical
equipment that cycles on and off, or construction work which can vary sporadically. The equivalent
sound level (Leq) describes the average acoustic energy content of noise for an identified period of
time, commonly 1 hour. Thus, the Leq of a time-varying noise and that of a steady noise are the same
if they deliver the same acoustical energy over the duration of the exposure. For many noise
sources, the Leq will vary depending on the time of day – a prime example is traffic noise which rises
and falls depending on the amount of traffic on a given street or freeway.
3.4 Day-Night Sound Level (Ldn)
It is recognized that a given level of noise may be more or less tolerable depending on the duration
of the exposure experienced by an individual, as well as the time of day during which the noise
occurs. The day-night sound level (Ldn) is a measure of the cumulative 24-hour noise exposure that
considers not only the variation of the A-weighted noise level but also the duration and the time of
day of the disturbance. The Ldn is derived from the twenty-four A-weighted 1-hour Leq’s that occur in
a day, with “penalties” applied to the Leq’s occurring during the nighttime hours (10 p.m. to 7 a.m.)
to account for increased noise sensitivity during these hours. Specifically, the Ldn is calculated by
adding 10 dBA to each of the nighttime Leq’s, and then taking the average value for all 24 hours. It is
noted that various federal, state, and local agencies have adopted Ldn as the measure of community
noise, including the United States Environmental Protection Agency (EPA). Figure 3-2 indicates the
typical outdoor Ldn at various locations for typical noise sources.
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90 dB
Threshold of pain
120 dB(A)
Disco
110 dB(A)
Next to freeway
Los Angeles, 3/4 mi. from LAX
Textile mill
Printing plant
80 dB
100 dB(A)
Downtown Los Angeles
Jackhammer at 50'
Power lawn mower at 5'
90 dB(A)
Heavy truck at 50'
Concrete mixer at 50'
70 dB
80 dB(A)
Housing on major street
10 dB change generally
perceived as twice or half as loud
Inside car at 40 mph
Common standard for noise exposure level
in exterior residential areas
70 dB(A)
Car, 60 mph at 100'
Los Angeles, 8 mi. from LAX
Old suburban residential area
Vacuum cleaner at 10'
60 dB
Conversational speech
60 dB(A)
5 dB change generally
perceived as quite noticeable
50 dB(A)
3 dB change is generally barely
perceptible
40 dB(A)
1 dB change is generally not
noticeable
Large transformer at 50'
Urban residence
Small town residence
Small town cul-de-sac
50 dB
Soft whisper at 6'
Common standard for noise exposure level
in interior residential areas
30 dB(A)
North rim of Grand Canyon
Farm
40 dB
20 dB(A)
10 dB(A)
30 dB
Figure 3-1. Common Noise Sources
and A-Weighted Noise Levels
Threshold of hearing
0 dB(A)
Figure 3-2. Common Ldn Noise
Exposure Levels at Various Locations
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4 Noise Criteria
4.1 City of Westlake Village Municipal Code
Chapter 4.4 of the municipal code provides the Noise Control Ordinance of the City of Westlake
Village. Regarding noise impacts on residential properties, Section 4.4.035 states that:
“…no person shall create or allow the creation of noise, sound or vibration on any
residential property or any property which abuts residential property, which causes the
noise level to exceed five (5) dBA above the local ambient noise level as measured at any
property line.”
For all other (i.e., non-residential) properties, Section 4.4.035 states that:
“…no person shall create or allow the creation of noise, sound or vibration on any
property, which causes the noise level to exceed eight (8) dBA above the local ambient
noise level as measured at any property line.”
Regarding noise generated by construction noise, Section 4.4.040 of the municipal code states that
all such construction activities are prohibited before 7:00 a.m. and after 7:00 p.m. Monday through
Friday, before 8:00 a.m. and after 5:00 p.m. Saturday, and at any time on Sunday or holidays, unless
express written permission has been granted by the City Manager to perform such work during
these hours.
4.2 City of Westlake Village General Plan
Chapter IV (Hazards), Section C of the City of Westlake Village General Plan provides the City’s Noise
Element, which includes a number of noise standards that are relevant to the Project. The exterior
noise standards that would apply to Project operation are provided in Table 4-1:
Table 4-1. General Plan Exterior Noise Standards
Land Use of Receptor Property
Designated noise-sensitive area
Residential
Commercial
Industrial
Time Interval
Exterior Noise Level That
May Not Be Exceeded
Anytime
45 dBA
10:00 p.m. to 7:00 a.m.
45 dBA
7:00 a.m. to 10:00 p.m.
50 dBA
10:00 p.m. to 7:00 a.m.
55 dBA
7:00 a.m. to 10:00 p.m.
60 dBA
Anytime
70 dBA
The primary off-site noise source that will affect the Project site in the future will be traffic on the
adjacent street. Figure 37 of the General Plan – Land Use Compatibility for Community Noise
Environments – provides a matrix that describes the compatibility of various land uses with different
levels of community noise exposure. The figure indicates that playgrounds and neighborhood parks
are normally acceptable in locations where the noise exposure is up to at least 67.5 dB Ldn, where
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normally acceptable is defined to mean that the “specified land use is satisfactory, based upon the
assumption that any buildings involved are of normal conventional construction without any special
noise insulation requirements”.
Regarding construction noise, the Noise Element prohibits the operation of “any tools or equipment
used in construction, drilling, repair, alteration or demolition work between the weekday hours of
7:00 p.m. and 7:00 a.m., or anytime on Sundays or holidays”. In addition, the noise element specifies
maximum noise level limits for construction equipment, as summarized in Table 4-2:
Table 4-2. General Plan Construction Noise Standards
Land Use of Receptor Property/Maximum Permissible Noise Level
Type of
Construction
“Mobile
a
Equipment”
“Stationary
b
Equipment”
Single-Family
Residential
Multi-Family
Residential
Semi-Residential/
Commercial
Commercial
Daily, except Sundays and
legal holidays, 7 AM to 7 PM
75 dBA
80 dBA
85 dBA
85 dBA
Daily, 7 PM to 7 AM, and all
day Sunday and legal holidays
60 dBA
64 dBA
70 dBA
85 dBA
Daily, except Sundays and
legal holidays, 7 AM to 7 PM
60 dBA
65 dBA
70 dBA
70 dBA
Daily, 7 PM to 7 AM, and all
day Sunday and legal holidays
50 dBA
55 dBA
60 dBA
60 dBA
Time Interval
Notes:
a. “Mobile Equipment” = intermittent operation for less than ten (10) days.
b. “Stationary Equipment” = repetitively scheduled operation for ten (10) days or more.
The proposed Project construction will take longer than ten days. Therefore, the “stationary
equipment” standards of Table 4-2 would apply.
Policy 3.1 of the Noise Element provides quantitative requirements related to overall (ambient)
noise, such as traffic noise, that could be relevant in assessing the Project’s noise impacts:
Policy 3.1 “Require noise-sensitive land uses (i.e., residents, hospitals, schools, etc.) in areas
exposed to existing or projected noise levels exceeding an Ldn of 60 dBA exterior, to incorporate
effective mitigation measures to reduce interior noise to no more than 45 dBA [Ldn]”.
4.3 California Green Building Standards Code (CALGreen)
Section 5.507 of the 2010 California Green Building Standards Code (CALGreen) identifies mandatory
interior noise standards for non-residential construction, which apply to buildings that are exposed
to a 1-hour Leq of 65 dBA or more during any hour of operation.
Two alternative methods for demonstrating compliance with the standards are provided in the
CALGreen Code. These are: (1) the prescriptive method, and (2) the performance method. The
prescriptive method requires that exterior wall and roof-ceiling assemblies making up the building
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envelope exposed to the noise source shall have a composite STC1 rating of at least 45 (or OITC2 35),
with exterior windows having a minimum STC of 40 (or OITC 30). The performance method requires
that an acoustical analysis be prepared demonstrating that the walls and roof-ceiling assemblies
exposed to the noise source making up the building envelope shall be constructed to provide an
interior noise environment attributable to exterior sources that does not exceed a 1-hour Leq of 50
dBA in occupied areas during any hour of operation.
To control noise transmission within the interior of non-residential buildings, Section 5.507.4.3 of
the CALGreen Code requires that “wall and floor-ceiling assemblies separating tenant spaces and
tenant spaces and public places shall have an STC of at least 40.” However, it is our understanding
that the YMCA will be the only tenant in the Project building and that, therefore, this standard does
not apply to the Project.
5 Thresholds of Significance
Based on the noise criteria discussed above, and the CEQA guidelines, a significant impact will be
assessed if any of the following conditions occur:
Exposure of persons to, or generation of, noise levels in excess of standards established in the
General Plan or Noise Ordinance of the City of Westlake Village, or applicable standards of other
agencies. This impact will occur if:
Project construction occurs before 7:00 a.m. or after 7:00 p.m., Monday through Friday,
before 8:00 a.m. or after 5:00 p.m. Saturday, or at any time on Sundays or federal holidays;
or,
Project construction noise (1-hour Leq) exceeds the applicable “stationary equipment” noise
standards of the Noise Element of the City of Westlake Village’s General Plan (refer to Table
4-2) at any of the surrounding properties; or,
Project operational noise increases the total noise level (1-hour Leq) by more than 5 dBA at
any residential property, or by more than 8 dBA at any other property; or,
Project operational noise (1-hour Leq) exceeds the applicable exterior noise standards of the
Noise Element of the City of Westlake Village’s General Plan (refer to Table 4-1) at any of the
surrounding properties; or,
Project-generated traffic causes the interior noise exposure within any residence, hospital,
school, or similar noise-sensitive land use to increase from a level of 45 dB Ldn or less to a
level greater than 45 dB Ldn; or,
1
Sound Transmission Class (STC) is a single number rating used to compare the sound insulation properties of walls, floors,
ceilings, windows, or doors. This rating is designed to correlate with subjective impressions of the ability of building
elements to reduce the overall loudness of speech, radio, television, and similar noise sources in offices and buildings.
2
Outdoor-Indoor Transmission Class (OITC) is a single number rating used to compare the sound insulation properties of
walls, floors, ceilings, windows, or doors. This rating is designed to compare the relative performance of building
elements with respect to their ability to reduce noise from transportation noise sources such as aircraft, freeway traffic,
and trains.
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The noise exposure at exterior areas of the Project intended for human use exceeds 67.5 dB
Ldn; or,
The exterior of the YMCA building is exposed to a 1-hour Leq of 65 dBA or more and the
interior 1-hour Leq exceeds 50 dBA during any hour of operation.
Exposure of persons to, or generation of, excessive ground-borne vibration or ground-borne
noise levels. Analysis of ground-borne vibration from Project construction is beyond the scope
of work for this study. Project operation does not include any significant sources of groundborne vibration and, as such, no ground-borne vibration impacts are anticipated during Project
operation. Therefore, this threshold is not analyzed any further in the remainder of this report.
A substantial temporary or periodic increase in ambient noise levels in the Project vicinity above
levels existing without the Project. This impact will occur if Project construction activities
increase the noise level (1-hour Leq) by 10 dBA or more to a noise level that exceeds the
applicable “stationary equipment” noise standards of the Noise Element of the City of Westlake
Village’s General Plan (refer to Table 4-2) at any of the surrounding properties.
A substantial permanent increase in ambient noise levels in the Project vicinity above levels
existing without the Project. This impact will occur if:
Project traffic increases the Ldn at any off-site noise-sensitive receptor by 5 dB or more; or
Project operational noise increases the total noise level (1-hour Leq) by more than 5 dBA at
any residential property, or by more than 8 dBA at any other property.
The Project would expose people residing or working in the Project area to excessive noise
levels as a result of activities at an airport or private airstrip. The nearest airports are Camarillo
Airport to the west and Van Nuys Airport to the east. Both of these airports are more than 15
miles from the Project site. At this distance, the Project vicinity is not exposed to significant
levels of aircraft noise. Therefore, this threshold is not analyzed any further in the remainder of
this report.
6 Existing Noise Environment
The study area is defined as the proposed Project site and adjacent properties plus the land uses
adjacent to all of the arterial segments considered in the traffic study [1] for the Project. The land
uses in the immediate vicinity of the Project site consist of single-family homes to the east,
commercial and light industrial properties to the south (across Thousand Oaks Boulevard), and
condominiums to the west. To the north, the Project site is bounded by vacant land that is not
considered to be noise-sensitive. The streets throughout the remainder of the study area are
bounded by a variety of land uses including residential, commercial and industrial properties. The
primary existing source of noise in the study area is traffic on the surrounding streets, as well as on
Highway 101.
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6.1 Noise Measurements
In order to document the existing noise environment, measurements were obtained at nine
locations throughout the study area. (Refer to Figure 6-1.) At four locations (Measurements #1
through #4) neighboring the Project site, the noise measurements were obtained continuously over
an approximately 3-day period between Friday, September 11 and Monday, September 14, 2009. At
the remaining five locations (Measurements #5 through #9) the ambient noise measurements were
obtained for a period of at least 20 minutes and extraneous noise sources (such as sirens) were
excluded from the measurements by placing the sound level meter on “standby” until the noise
event was concluded. Each measurement was obtained with the measurement microphone at a
height of five feet above the ground. The results of the noise measurements, provided in Appendix I,
are summarized in Table 6-1.The locations are identified as follows:
#1 - At the patio/yard of 134 Via Colinas. This location was a condominium west of the Project site.
#2 - At the west fence line of 5867 Cardoza Drive. This location was a single-family home east of
the Project site. The property slopes up from the house toward the Project site to the west and
the sound level meter was located adjacent to the west fence line where the elevation was
highest.
#3 - In the rear yard of 5823 Cardoza Drive. This location was a single-family home east of the
Project site. This property slopes up toward the Project site to the west. The sound level meter
was located at the bottom of the slope at the same elevation as the house itself.
#4 - On the elevated slope of 5823 Cardoza Drive. This location was at the same single-family home
as Measurement #3. The sound level meter was located up the slope toward the west fence
line of the property, closer to the Project site than Measurement #3.
#5 - In the front yard of 5893 Logwood Road. This location was a single-family home adjacent to
the east side of Lindero Canyon Road, north of Thousand Oaks Boulevard.
#6 - Adjacent to homes on Vercelly Court. This location was adjacent to the south side of Thousand
Oaks Boulevard, east of Lindero Canyon Road. Access could not be gained to the residential
properties because they were located in a gated community. Therefore, the measurement was
obtained on the adjacent sidewalk of Portola Court.
#7 - In the back yard of 4201 Abbington Court. This location was a single-family home adjacent to
the north side of Lindero Canyon Road, south of Agoura Road.
#8 - In the back yard of 4531 Sevenoaks Court. This location was a single-family home adjacent to
the south side of Agoura Road, west of Lindero Canyon Road.
#9 - Adjacent to 49 Via Colinas. This location was a condominium adjacent to the north side of
Thousand Oaks Boulevard, west of the Project site.
The instrumentation used to obtain the noise measurements consisted of integrating sound level
meters (Models 820 and 712) and an acoustical calibrator (Model CAL200) manufactured by Larson
Davis Laboratories. The accuracy of the calibrator is maintained through a program established by
the manufacturer, and is traceable to the National Bureau of Standards. All instrumentation meets
the requirements of the American National Standards Institute (ANSI) S1.4.
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2
1
3&4
5
9
6
8
7
Figure 6-1. Noise Measurement Locations
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Table 6-1. Summary of Noise Measurements
Measurement #
Location Description
Measurement Period
Measured 1-Hour Leq, dBA
1
134 Via Colinas
Approx. 72 hours
Daytime: 44.1 – 54.3
a
Nighttime : 47.0 – 50.1
2
5867 Cardoza Drive
Approx. 72 hours
Daytime: 41.7 – 54.0
a
Nighttime : 41.2 – 54.0
3
5823 Cardoza Drive; at house
elevation
Approx. 72 hours
Daytime: 37.4 – 50.8
a
Nighttime : 37.9 – 45.8
4
5823 Cardoza Drive; up slope
Approx. 72 hours
Daytime: 41.4 – 55.7
a
Nighttime : 39.3 – 49.2
5
5893 Logwood Road
12:17 PM to 12:37 PM
56.8
6
Adjacent to homes on Vercelly
Court
12:50 PM to 1:10 PM
64.1
7
of 4201 Abbington Court
2:45 PM to 3:05 PM
59.0
8
4531 Sevenoaks Court
2:05 PM to 2:30 PM
57.7
9
49 Via Colinas
1:15 PM to 1:35 PM
59.5
Notes:
a. Nighttime noise levels only include the hours between 10:00 p.m. and 7:00 a.m. during which the YMCA
and/or park are scheduled to be open.
6.2 Traffic
Using average daily traffic volume (ADT) data provided by Willdan [1], an analysis of existing traffic
noise was conducted using a model based on the lookup tables developed by the Federal Highway
Administration for their Traffic Noise Model (TNM) [2, 3]. The model was used to estimate existing
traffic noise levels adjacent to the arterials based on traffic volumes, speeds, truck mix, site
conditions, and distance from the roadway to the receptor. The results of the modeling effort,
provided in Appendix II, are summarized in Table 9-2. Referring to the table, the results are
presented in terms of the unmitigated Ldn at a distance of 50 feet from the centerline of the street.
Where properties are more than 50 feet from the centerline of the street and/or they are shielded
by noise barriers such as property line walls, the actual noise levels will be lower than those
reported in Table 6-2.
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Table 6-2. Existing Traffic Noise Levels
Street / Segment
Lindero Canyon Road
North of Thousand Oaks Boulevard
Thousand Oaks Boulevard to Russell Ranch Road
Russell Ranch Road to Via Colinas
Via Colinas to US-101 NB Ramps
US 101 NB Ramps to US 101 SB Ramps
US 101 SB Ramps to Agoura Road
South of Agoura Road
Thousand Oaks Boulevard
Westlake Boulevard to Via Colinas
Via Colinas to Project Exit Driveway
Project Exit Driveway to Project Entry Driveway
Project Entry Driveway to Lindero Canyon Road
East of Lindero Canyon Road
Via Colinas
Thousand Oaks Boulevard to Via Rocas
Via Rocas to Lindero Canyon Road
Agoura Road
West of Lindero Canyon Road
US 101 Freeway
North of Lindero Canyon Road
South of Lindero Canyon Road
Ldn Due to Traffic at 50 Feet
from Centerline of Street, dBA
72.0
70.8
71.7
73.2
72.5
72.0
68.0
69.5
68.5
68.5
68.5
68.8
63.8
66.2
67.9
66.6
84.5
84.4
7 Future Conditions with Project
7.1 Project Construction
It is assumed that all Project construction activities will take place within the City-approved hours of
7:00 a.m. to 7:00 p.m., Monday through Friday and 8:00 a.m. to 5:00 p.m. on Saturday. Based on
information provided by Sespe Consulting [4], the construction can be divided into five main phases
(excluding rough grading which has already been completed), as described below:
Phase I. Excess dirt removal. This phase will remove excess dirt that is left over from rough grading.
The work will utilize two scrapers, an excavator, a water truck, and ten dump trucks and is
expected to take three weeks. Based on comments received from the City of Westlake
Village, it is assumed that all excess dirt removal will occur on the rough-graded pad where
the YMCA building and park will be constructed.
Phase II. Precise grading. This phase will entail setting final grade and elevations for the YMCA
building, play fields and parking lot which will also provide for site drainage. The work will
utilize a scraper, a grader, three tractors/backhoes, and one water truck.
Phase III. Building Construction. This phase will construct the YMCA building structure; it is assumed
that smaller auxiliary building (restroom, concessions, etc.) will also be constructed at this
14
September 18, 2012
WILLDAN
time. The work will utilize a crane, an excavator, a forklift, a grader, a trencher, a welder,
and miscellaneous other industrial equipment.
Phase IV. Architectural coating. This phase will finish the exterior of the YMCA building and will
utilize three compressors.
Phase V. Asphalt paving. This phase will pave the exterior asphalt areas, primarily consisting of the
parking lots. The work will utilize an asphalt truck, a paver, and two rollers.
It is understood that, because rough grading has already been completed at the Project site and
construction of the access driveways has already been approved by the City, all the remaining work
to be analyzed as part of this study will take place within the area of the pad on which the YMCA
building and park will be located. In order to estimate which construction phase(s) will generate the
highest noise levels, an analysis was conducted to estimate the total noise levels generated by all
the construction equipment operating during each phase. Table 7-1 provides a summary of this
analysis. (Noise levels are calculated at a reference distance of 50 feet.)
Referring to Table 7-1, the highest noise levels are associated with Phase I (excess dirt removal).
Therefore, Phase I noise levels were chosen as a worst case example for further analysis using
SoundPLAN noise modeling software. This software takes a number of significant variables into
account, including: source sound power levels, the distances from sources to receivers, the heights
of sources and receivers, ground effects, barrier effects provided by topography or man-made
structures, and reflections of noise off hard surfaces.
Construction noise levels at any given receiver will generally be highest when the construction
activity is occurring closest to that receiver. Therefore, SoundPLAN was used to calculate the noise
levels with construction activity occurring at three different locations: at the west end of the park (in
the vicinity of the baseball fields), in the center of the park (in the vicinity of the YMCA building), and
at the west end of the park (in the vicinity of the soccer fields). A noise contour map was then
generated to identify the worst case noise levels that will occur at the surrounding land uses during
the construction process. This noise contour map is presented in Figure 7-1.
15
September 18, 2012
WILLDAN
Table 7-1. Analysis of Estimated Equipment Sound Power Levels During Each Construction
Phase
Construction Phase
/ Equipment Item
Maximum Equipment Noise
a
Level @ 50’, per unit
Usage
a,b
Factor
Number
of Units
Estimated Average Noise
c
Level at 50’, 1-Hour Leq
Phase I - Excess Dirt Removal
Dozer
85 dBA
0.4
2
84 dBA
Loader
85 dBA
0.4
1
81 dBA
Skiploader
85 dBA
0.4
1
81 dBA
Water Truck
88 dBA
0.4
1
84 dBA
Dump Truck
84 dBA
0.4
4
86 dBA
91 dBA
Combined:
Phase II - Precise Grading
Scraper
89 dBA
0.4
1
Grader
85 dBA
0.4
1
85 dBA
81 dBA
Water Truck
88 dBA
0.4
1
84 dBA
Tractor/Backhoe
84 dBA
0.4
3
85 dBA
90 dBA
Combined:
Phase III – Building Construction
Crane
88 dBA
0.16
1
80 dBA
Excavator
85 dBA
0.4
1
81 dBA
Forklift
75 dBA
0.4
1
71 dBA
Grader
85 dBA
0.4
1
81 dBA
Trencher
82 dBA
0.5
1
79 dBA
Welder
74 dBA
0.4
1
70 dBA
Pneumatic Tool
85 dBA
0.5
1
82 dBA
86 dBA
Combined:
Phase IV - Architectural Coating
Compressor
81 dBA
0.4
3
82 dBA
82 dBA
Combined:
Phase V - Asphalt Paving
Paver
89 dBA
0.5
1
86 dBA
Roller
74 dBA
0.2
2
70 dBA
Asphalt Truck
84 dBA
0.4
1
80 dBA
Combined:
87 dBA
Notes:
a. Maximum noise levels and usage factors obtained or estimated from References 5, 6 and 7.
b. Usage Factor is the percentage of time equipment is operating in noisiest mode while in use.
c. Average noise level =
Maximum Equipment Noise Level + 10×log(usage factor) + 10×log(number of units)
16
September 18, 2012
Figure 7-1. Estimated
Worst Case Construction
Noise Levels
1-hour Leq, dBA
75.0
70.0
65.0
60.0
55.0
50.0
45.0
40.0
>
<=
80.0
80.0
75.0
70.0
65.0
60.0
55.0
50.0
45.0
40.0
Signs and symbols
Elevation line
Construction areas
0
250
500
750
feet
Calculation Date: September 14, 2012
WILLDAN
Referring to Figure 7-1, the estimated worst-case construction noise level at the condominiums to
the west of the Project site is up to 55 dBA. This is less than the applicable “stationary equipment”
noise standard of 65 dBA for multi-family residences; therefore, the impact is less than significant at
this location with regard to this standard. Referring to Appendix I, the measured ambient 1-hour Leq
within the condominium community was as low as 44.1 dBA during the hours in which construction
might occur. Therefore the estimated construction noise level of 55 dBA will increase the overall
noise level by marginally more than 10 dBA; however, because the resulting noise level is below the
applicable standard of 65 dBA, the impact is less than significant.
The estimated worst-case construction noise level at the homes to the east of the Project site is up
to 52 dBA. This is less than the applicable “stationary equipment” noise standard of 60 dBA for
single-family residences; therefore, the impact is less than significant at this location with regard to
this standard. Referring to Appendix I, the measured ambient 1-hour Leq within the single-family
community was as low as 43.5 dBA during the hours in which construction might occur. Therefore,
the estimated construction noise level of 52 dBA will increase the overall noise level by less than 10
dBA and the impact is less than significant.
The estimated worst-case construction noise level at the businesses to the south of the Project site
is up to 69 dBA. This is less than the applicable “stationary equipment” noise standard of 70 dBA for
commercial properties; therefore, the impact is less than significant at this location with regard to
this standard. Based on the existing traffic noise levels summarized in Table 6-2, the average
daytime traffic noise level is estimated to be approximately 68 dBA at the businesses (the average
daytime 1-hour Leq is calculated to be 0.7 dBA lower than the corresponding Ldn). Therefore, the
estimated construction noise level of 69 dBA will increase the overall noise level by less than 10 dBA
and the impact is less than significant. Because the analysis is based on noise levels from Phase I
construction, it is noted that noise levels will be lower during other phases of construction. Referring
to Table 7-1 the noise levels will be approximately 1 dBA lower during Phase II, 5 dBA lower during
Phase III, 9 dBA lower during Phase IV, and 4 dBA lower during Phase V.
7.2 Project Operation
Based on information provided by the Project design team, all mechanical equipment for the Project
will be located inside a mechanical room at the YMCA building. The noise reduction provided by the
mechanical room, and by the distance and topography between the YMCA building and the
surrounding properties, is anticipated to mitigate any potential noise impacts from the mechanical
equipment. Therefore, Project mechanical equipment is not analyzed any further in the remainder
of this report.
The two main types of noise sources associated with the Project are traffic and activities at the
YMCA/Park site. These are discussed in the following sections.
18
September 18, 2012
WILLDAN
7.2.1 Traffic
Using traffic data provided by Willdan [1], an analysis of future traffic noise was conducted using the
same techniques described previously in Section 6.2. Three different cases were considered:
1. Near-term-with-Project (based on existing + Project traffic data).
2. Future-without-Project (based on existing + other projects traffic data).
3. Future-with-Project (based on existing + other projects + Project traffic data).
In order to assess potential impacts, the near-term-with-Project case is compared to the existing
case and the future-with-Project case is compared to the future-without-Project case. The results of
the modeling effort, provided in Appendix II, are summarized in Tables 7-2 (for near-term and
existing cases) and 7-3 (for future cases).
Table 7-2. Near-Term With Project vs. Existing Traffic Noise Levels
Ldn Due to Traffic at 50 Feet from
Centerline of Street, dBA
Street / Segment
Lindero Canyon Road
Via Colinas
Agoura Road
US 101 Freeway
Existing
Near-Term With
Project
Estimated
Traffic Noise
Increase, dB Ldn
72.0
70.8
71.7
73.2
72.5
72.0
68.0
72.2
71.0
71.8
73.4
72.6
72.1
68.1
0.2
0.2
0.2
0.2
0.1
0.1
0.1
69.5
68.5
68.5
68.5
68.8
69.7
69.5
68.9
69.3
69.0
0.1
1.0
0.5
0.8
0.2
63.8
66.2
64.1
66.4
0.3
0.2
67.9
66.6
67.9
66.7
0.1
0.0
84.5
84.4
84.5
84.5
0.0
0.0
19
September 18, 2012
WILLDAN
Table 7-3. Future With Project vs. Future Without Project Traffic Noise Levels
Ldn Due to Traffic at 50 Feet from
Centerline of Street, dB
Street / Segment
Lindero Canyon Road
Via Colinas
Agoura Road
US 101 Freeway
Future Without
Project
Future With
Project
Estimated
Traffic Noise
Increase, dB Ldn
72.3
71.3
71.7
74.1
73.2
72.4
68.5
72.4
71.5
71.8
74.2
73.3
72.5
68.6
0.2
0.2
0.2
0.1
0.1
0.1
0.1
69.7
68.6
68.6
68.6
69.3
69.8
69.6
69.1
69.5
69.4
0.1
1.0
0.4
0.8
0.2
64.2
66.4
64.4
66.6
0.3
0.2
68.3
67.1
68.4
67.1
0.1
0.0
84.6
84.5
84.6
84.5
0.0
0.0
Typical residential construction, with windows closed, provides about 20 dB of exterior to interior
noise reduction. Therefore, the interior traffic noise threshold of 45 dB Ldn corresponds to an
exterior level of 65 dB Ldn. Referring to Tables 7-2 and 7-3, there are no locations at which Project
traffic increases the exterior noise level from below 65 dB Ldn to above 65 dB Ldn; therefore, there
are no impacts with respect to this threshold. The maximum estimated traffic noise increase due to
the Project is 1 dB Ldn; this is less than the threshold of 5 dB Ldn established for the Project and
therefore, is less than significant.
The closest exterior areas of the Project intended for human use (the park and circumferential trail)
will be approximately 250 feet from the nearest street (Thousand Oaks Boulevard). Referring to
Appendix II, the estimated noise exposure at this distance will be approximately 65 dB Ldn, which is
less than the applicable threshold of 67.5 dB Ldn. Therefore, there is no impact with respect to this
threshold.
The YMCA building will be approximately 400 feet from Thousand Oaks Boulevard. Referring to
Appendix II, the estimated noise exposure at this location will be less than 65 dB Ldn. The average
daytime 1-hour Leq due to traffic is calculated to be 0.7 dBA lower than the corresponding Ldn;
therefore, the estimated 1-hour Leq at the YMCA building will be less than 65 dBA. This is below the
threshold at which CALGreen’s prescriptive or performance standards apply; therefore, there is no
impact with respect to this threshold.
20
September 18, 2012
WILLDAN
7.2.2 Park Activities
The activities occurring at the Project site once it is operational will vary depending on many factors,
such as: time of day, day of the week, time of the year, weather conditions, etc. The noise levels will
fluctuate along with these variables. In order to make a useful assessment of operational noise
levels possible, it was decided to model a worst-case scenario that incorporates a combination of
the major noise generating activities that will occur at the site during the year. In order to provide a
conservative assessment, this scenario included activities that might rarely occur simultaneously
during actual operations at the Project.
The scenario was analyzed using SoundPLAN noise modeling software. This software takes a number
of significant variables into account, including source sound power levels, the distances from
sources to receivers, the heights of sources and receivers, ground effects, barrier effects provided by
topography, walls or buildings, and reflections of noise off hard surfaces.
The following list describes the noise sources that were included in the noise model for the worst
case operational scenario:
1. Simultaneous soccer games at three fields at the east end of the park. City of Westlake Village
staff estimated that, at peak times, there would be up to 360 people attending soccer games
(including players, coaches, officials, and spectators). Noise levels generated by each member of
the crowd, as well as each player on the field, were estimated based on noise measurements of
competitive adult and little league soccer games that were obtained as part of a previous noise
study in Costa Mesa, California.
2. Simultaneous baseball games at three fields at the west end of the park. Official estimates of
crowd sizes at the baseball fields were not available. Therefore, an estimated total of 313
people (including players, coaches, officials, and spectators) was used in the model. This number
was estimated by assuming that the number of spectators attending to support each baseball
player would be the same as that the number of spectators attending to support each soccer
player. Noise levels generated by each member of the crowd, as well as each player on the field,
where assumed to be the same as for soccer games.
3. Parking lots. Based on the parking analysis for the Project [8], there will be up to 307 vehicles
entering the parking lots and 249 vehicles exiting the parking lots during the busiest hour. All of
these vehicle movements were included in the noise model using SoundPLAN’s integrated
parking lot noise calculation capabilities. Traffic on the driveways leading to and from the
parking lots was also included.
4. Skatepark. Noise from the skatepark was estimated based on measurements obtained at an
existing skatepark in the City of Brea, California, as part of a previous noise study. The size of the
existing skatepark was approximately 10,000 square feet and up to 17 people were observed
within the skatepark during the measurements.
5. Tot lot. Noise from the tot lot was estimated based on measurements obtained at an existing tot
lot in the City of Orange, California, as part of a previous noise study. Up to 35 children were
observed at the existing tot lot during the measurements.
21
September 18, 2012
WILLDAN
Using the assumptions above, the noise model incorporates all of the worst-case (busiest and
noisiest) activities that are expected to take place at the Project site, including those that will occur
closest to the neighboring homes to the east and west. Other activities at the park, such as batting
cages, outdoor basketball games, volleyball games, and general park use (people talking at picnic
tables and barbeques, gazebos and arbors, open grass areas, etc.) are expected to generate much
lower noise levels at the surrounding properties because they are quieter at the source (due to less
participants and smaller crowds) and are located towards the center of the Project site, away from
the neighboring homes.
The results of the noise modeling are provided as a noise contour map in Figure 7-2 and are
summarized in Table 7-4, below. Table 7-4 also summarizes the existing noise levels and the
estimated noise increases due to the Project.
Table 7-4. Summary of Estimated Noise Levels Due to Project Operations
Noise Level Due to
Project Operations
Ambient Noise
Level
42 dBA
41.0 dBA
Single-family homes
east of Project site
38 dBA
37.4 dBA
Businesses south of
Project site
50 dBA
60 dBA
Location
Condominiums west
of Project site
b
Total Combined Noise
Level (Project + Ambient)
Noise Increase
Due to Project
a
44.5 dBA
3.5 dBA
a
40.7 dBA
3.3 dBA
60.4 dBA
0.4 dBA
Notes:
All noise levels are estimated 1-hour Leq’s
a. To provide a conservative analysis, the lowest ambient noise levels measured during the proposed hours of park
operation are used.
b. To provide a conservative analysis, the estimated nighttime traffic noise level is used (this coincides with late
evening use of the park). The average nighttime traffic noise level is estimated to be 8.6 dBA lower than the
corresponding existing traffic Ldn in Table 6-2.
Referring to Table 7-4, the Project operational noise levels will be less than the City’s applicable
daytime and nighttime noise standards of 50 dBA and 45 dBA, respectively, at the neighboring
residential properties (single-family homes to the east and condominiums to the west). The Project
operational noise levels will be less than the City’s applicable daytime and nighttime noise standards
of 60 dBA and 55 dBA, respectively, at the commercial properties to the south. In addition, Project
operations will increase noise levels by less than 5 dBA at the residential properties and by less than
8 dBA at the commercial properties. Therefore, Project operational impacts are less than significant
with respect to the thresholds established in this study.
22
September 18, 2012
Figure 7-2. Estimated
Worst Case Park Activity
Noise Levels
1-hour Leq, dB(A)
75.0
70.0
65.0
60.0
55.0
50.0
45.0
40.0
>
<=
80.0
80.0
75.0
70.0
65.0
60.0
55.0
50.0
45.0
40.0
Signs and symbols
Elevation line
Noise sources
YMCA building
0
250
500
750
feet
Calculation Date: August 14, 2012
WILLDAN
8 Summary of Impacts
Using the criteria established in this study, along with the noise analyses of Section 7, Table 8-1
provides a summary of the noise impacts caused by the proposed Project.
Table 8-1. Summary of Impacts
Construction/
Operation
Phase or Scenario
Assessment of Noise Impact
Construction
All Phases
Less than significant impact
Operation
Project traffic
Park Activity
9 Mitigation Measures
The analysis of Project operational noise levels in this study was based on several assumptions.
Therefore, these assumptions are reiterated in this section as noise mitigation measures (Items #1
through #3) that must be included in the Project’s design and operation. Additional measures (Items
#4 through #9) are recommended in order to minimize noise from construction activities:
1. No bullhorns shall be used at the park.
2. Any public address (PA) system or other loudspeaker system to be used at the park shall be
designed and set up to ensure that it does not exceed the applicable City noise standards at the
surrounding properties. Appropriate measures may include, but are not limited to: proper
placement and direction of loudspeakers, placing limits on the gain (volume) of the system,
restricting system use to specific times of the day or week, etc. If the system cannot be designed
or set up to achieve compliance with City standards, it shall not be used.
3. No park activities shall take place on the berms or hills east of the soccer fields or west of the
baseball fields. All park activities shall take place below the elevation of the berms/hills so that
they are shielded from the neighboring residential properties. Crowds for sporting events shall
not be permitted to utilize the berms/hills.
4. Construction activities shall be limited to between 7:00 a.m. and 7:00 p.m. Monday through
Friday, and between 8:00 a.m. and 5:00 p.m. on Saturday; no construction activities shall occur
at any time on Sunday or Federal holidays. Personnel shall not be permitted on the job site, and
material or equipment deliveries and collections shall not be permitted outside of these hours.
5. To the extent practicable, the quietest available type of construction equipment shall be used.
Newer equipment is generally quieter than older equipment. The use of electric powered
equipment is typically quieter than diesel, and hydraulic powered equipment is quieter than
pneumatic power. If compressors powered by diesel or gasoline engines are to be used, they
shall be contained or have baffles to help abate noise levels.
6. All construction equipment shall be equipped with properly operating and maintained muffling
devices.
24
September 18, 2012
WILLDAN
7. Construction equipment shall be operated only when necessary, and shall be switched off when
not in use.
8. Whenever possible, stationary noise sources (such as compressors) shall be positioned as far
away as possible from noise-sensitive areas and/or in locations where they are shielded by other
objects that will act as noise barriers (such as buildings, stockpiled construction materials, etc.).
9. To the extent practicable, construction equipment shall be stored on the Project site while in
use. This will eliminate noise associated with repeated transportation of the equipment to and
from the site.
10 References
1. Daily Traffic Volumes_8-29-12_Final.xlsx. Willdan Engineering. August 29, 2012.
2. FHWA Traffic Noise Model, Version 2.5 Look-Up Table, User’s Guide. U.S. Department of
Transportation, Federal Highway Administration. Final Report, December 2004.
3. Traffic Noise Model (FHWA TNM) LookUp Program, Software Version 2.1 (Data Generated by
TNM Version 2.5). U.S. Department of Transportation, Federal Highway Administration.
February 22, 2007.
4. Triunfo YMCA InfoRequest_v2_jb additions.docx – Memorandum regarding Information Request,
Dole Family Park and YMCA. Sespe Consulting, Inc. July 18, 2012.
5. Transportation- and Construction-Induced Vibration Guidance Manual. Jones & Stokes (J&S 02039). Contract No. 43A0049 for California Department of Transportation, Noise, Vibration, and
Hazardous Waste Management Office, Sacramento, CA. June 2004.
6. FHWA Roadway Construction Noise Model (RCNM), Version 1.0. Federal Highway
Administration. February 2, 2006.
7. Noise from Construction Equipment and Operations, Building Equipment, and Home Appliances.
Bolt Beranek and Newman/U.S. Environmental Protection Agency. December 31, 1971.
8. City of Westlake Village YMCA/Community Park SEIR Peak Hour Trip Generation Estimates,
Scenario C (Weekday Practice). Provided by Willdan Engineering. December 6, 2010.
9. Cross Sections @20sc 11X17 8-09-12.pdf – building floor plans and cross section. Provided by
Willdan Engineering on August 10, 2012.
10. 7-18-12 SITE PLAN ACS 200sc 11X17 w Fire Lane Access.pdf. Provided by Willdan Engineering.
July 18, 2012.
11. Westlake Village Community Park 2-25-10 Grading Plan.dxf. Provided by Willdan Engineering on
July 18, 2012.
12. v-TOPO.dwg – topographical plan for Project site and surrounding area. MIG, Inc. September
16, 2009.
13. c-BNDY.dxf, c-ROAD-SITE.dxf, c-SITE-WITH IMAGE.dxf, x-BNDY.dxf, and x-UTIL.dxf – Project site
and plans. Provided by Willdan Engineering on August 9, 2012.
25
September 18, 2012
APPENDIX I
Noise Measurements
Table I-1. Noise Survey (page 1 of 2)
Project:
Westlake Village Community Park/Triunfo YMCA, 09.031.01
Position:
#1 - At the patio/yard of 134 Via Colinas
Date & Time:
Noted
Noise Source:
Ambient
Distance:
Varies
SLM Height:
5'
LD 712 S/N:
0556
LD CAL200, Calibrator S/N:
Date
Measurement
Period
Average Noise Level (Leq), dBA
Fri 9/11/2009
16:00 - 17:00
N/A
Fri 9/11/2009
17:00 - 18:00
47.9
Fri 9/11/2009
18:00 - 19:00
47.2
Fri 9/11/2009
19:00 - 20:00
53.6
Fri 9/11/2009
20:00 - 21:00
46.2
Fri 9/11/2009
21:00 - 22:00
46.2
Fri 9/11/2009
22:00 - 23:00
48.1
Fri 9/11/2009
23:00 - 00:00
48.1
Sat 9/12/2009
00:00 - 01:00
47.3
Sat 9/12/2009
01:00 - 02:00
48.0
Sat 9/12/2009
02:00 - 03:00
48.6
Sat 9/12/2009
03:00 - 04:00
47.1
Sat 9/12/2009
04:00 - 05:00
48.8
Sat 9/12/2009
05:00 - 06:00
48.3
Sat 9/12/2009
06:00 - 07:00
48.6
Sat 9/12/2009
07:00 - 08:00
49.6
Sat 9/12/2009
08:00 - 09:00
50.8
Sat 9/12/2009
09:00 - 10:00
48.7
Sat 9/12/2009
10:00 - 11:00
47.8
Sat 9/12/2009
11:00 - 12:00
49.3
Sat 9/12/2009
12:00 - 13:00
47.3
Sat 9/12/2009
13:00 - 14:00
46.8
Sat 9/12/2009
14:00 - 15:00
46.1
Sat 9/12/2009
15:00 - 16:00
44.1
Sat 9/12/2009
16:00 - 17:00
47.4
Sat 9/12/2009
17:00 - 18:00
46.4
Sat 9/12/2009
18:00 - 19:00
45.8
Sat 9/12/2009
19:00 - 20:00
47.1
Sat 9/12/2009
20:00 - 21:00
47.9
Sat 9/12/2009
21:00 - 22:00
47.4
Sat 9/12/2009
22:00 - 23:00
47.5
Sat 9/12/2009
23:00 - 00:00
48.6
Sun 9/13/2009
00:00 - 01:00
48.4
2916
Table I-1. Noise Survey, Continued (page 2 of 2)
Date
Measurement
Period
Sun 9/13/2009
01:00 - 02:00
47.7
Sun 9/13/2009
02:00 - 03:00
47.3
Sun 9/13/2009
03:00 - 04:00
47.6
Sun 9/13/2009
04:00 - 05:00
47.6
Sun 9/13/2009
05:00 - 06:00
47.7
Sun 9/13/2009
06:00 - 07:00
47.0
Sun 9/13/2009
07:00 - 08:00
47.4
Sun 9/13/2009
08:00 - 09:00
47.4
Sun 9/13/2009
09:00 - 10:00
48.1
Sun 9/13/2009
10:00 - 11:00
48.7
Sun 9/13/2009
11:00 - 12:00
48.7
Sun 9/13/2009
12:00 - 13:00
47.9
Sun 9/13/2009
13:00 - 14:00
45.4
Sun 9/13/2009
14:00 - 15:00
46.5
Sun 9/13/2009
15:00 - 16:00
46.2
Sun 9/13/2009
16:00 - 17:00
54.3
Sun 9/13/2009
17:00 - 18:00
53.0
Sun 9/13/2009
18:00 - 19:00
48.8
Sun 9/13/2009
19:00 - 20:00
48.0
Sun 9/13/2009
20:00 - 21:00
46.8
Sun 9/13/2009
21:00 - 22:00
48.4
Sun 9/13/2009
22:00 - 23:00
48.8
Sun 9/13/2009
23:00 - 00:00
48.1
Mon 9/14/2009
00:00 - 01:00
47.6
Mon 9/14/2009
01:00 - 02:00
48.0
Mon 9/14/2009
02:00 - 03:00
47.9
Mon 9/14/2009
03:00 - 04:00
47.5
Mon 9/14/2009
04:00 - 05:00
47.3
Mon 9/14/2009
05:00 - 06:00
50.1
Mon 9/14/2009
06:00 - 07:00
49.0
Mon 9/14/2009
07:00 - 08:00
47.1
Mon 9/14/2009
08:00 - 09:00
47.4
Mon 9/14/2009
09:00 - 10:00
49.1
Mon 9/14/2009
10:00 - 11:00
51.4
Mon 9/14/2009
11:00 - 12:00
46.4
Mon 9/14/2009
12:00 - 13:00
48.7
Mon 9/14/2009
13:00 - 14:00
47.2
Mon 9/14/2009
14:00 - 15:00
45.9
Mon 9/14/2009
15:00 - 16:00
46.3
Project:
Position:
#2 - At the west fence line of 5867 Cardoza Drive
Date & Time:
Noted
Noise Source:
Ambient
Distance:
Varies
SLM Height:
5'
LD 820 S/N:
0996
Date
Measurement
Period
Fri 9/11/2009
16:00 - 17:00
45.7
Fri 9/11/2009
17:00 - 18:00
45.1
Fri 9/11/2009
18:00 - 19:00
43.6
Fri 9/11/2009
19:00 - 20:00
46.6
Fri 9/11/2009
20:00 - 21:00
44.2
Fri 9/11/2009
21:00 - 22:00
44.6
Fri 9/11/2009
22:00 - 23:00
44.7
Fri 9/11/2009
23:00 - 00:00
43.7
Sat 9/12/2009
00:00 - 01:00
43.2
Sat 9/12/2009
01:00 - 02:00
42.4
Sat 9/12/2009
02:00 - 03:00
42.4
Sat 9/12/2009
03:00 - 04:00
44.1
Sat 9/12/2009
04:00 - 05:00
41.8
Sat 9/12/2009
05:00 - 06:00
46.6
Sat 9/12/2009
06:00 - 07:00
48.6
Sat 9/12/2009
07:00 - 08:00
50.7
Sat 9/12/2009
08:00 - 09:00
47.2
Sat 9/12/2009
09:00 - 10:00
47.7
Sat 9/12/2009
10:00 - 11:00
46.1
Sat 9/12/2009
11:00 - 12:00
47.9
Sat 9/12/2009
12:00 - 13:00
47.4
Sat 9/12/2009
13:00 - 14:00
45.8
Sat 9/12/2009
14:00 - 15:00
45.1
Sat 9/12/2009
15:00 - 16:00
44.5
Sat 9/12/2009
16:00 - 17:00
44.6
Sat 9/12/2009
17:00 - 18:00
42.0
Sat 9/12/2009
18:00 - 19:00
43.5
Sat 9/12/2009
19:00 - 20:00
45.1
Sat 9/12/2009
20:00 - 21:00
44.8
Sat 9/12/2009
21:00 - 22:00
43.8
Sat 9/12/2009
22:00 - 23:00
41.2
Sat 9/12/2009
23:00 - 00:00
39.6
Sun 9/13/2009
00:00 - 01:00
38.4
2916
Date
Measurement
Period
Sun 9/13/2009
01:00 - 02:00
41.7
Sun 9/13/2009
02:00 - 03:00
46.2
Sun 9/13/2009
03:00 - 04:00
51.4
Sun 9/13/2009
04:00 - 05:00
53.4
Sun 9/13/2009
05:00 - 06:00
54.0
Sun 9/13/2009
06:00 - 07:00
53.3
Sun 9/13/2009
07:00 - 08:00
53.0
Sun 9/13/2009
08:00 - 09:00
52.9
Sun 9/13/2009
09:00 - 10:00
50.7
Sun 9/13/2009
10:00 - 11:00
48.0
Sun 9/13/2009
11:00 - 12:00
46.4
Sun 9/13/2009
12:00 - 13:00
47.9
Sun 9/13/2009
13:00 - 14:00
46.9
Sun 9/13/2009
14:00 - 15:00
46.5
Sun 9/13/2009
15:00 - 16:00
46.0
Sun 9/13/2009
16:00 - 17:00
54.0
Sun 9/13/2009
17:00 - 18:00
44.9
Sun 9/13/2009
18:00 - 19:00
41.7
Sun 9/13/2009
19:00 - 20:00
42.9
Sun 9/13/2009
20:00 - 21:00
42.8
Sun 9/13/2009
21:00 - 22:00
45.6
Sun 9/13/2009
22:00 - 23:00
47.7
Sun 9/13/2009
23:00 - 00:00
47.0
Mon 9/14/2009
00:00 - 01:00
46.4
Mon 9/14/2009
01:00 - 02:00
46.9
Mon 9/14/2009
02:00 - 03:00
46.0
Mon 9/14/2009
03:00 - 04:00
45.6
Mon 9/14/2009
04:00 - 05:00
48.0
Mon 9/14/2009
05:00 - 06:00
49.5
Mon 9/14/2009
06:00 - 07:00
51.4
Mon 9/14/2009
07:00 - 08:00
50.2
Mon 9/14/2009
08:00 - 09:00
49.3
Mon 9/14/2009
09:00 - 10:00
47.4
Mon 9/14/2009
10:00 - 11:00
46.3
Mon 9/14/2009
11:00 - 12:00
45.6
Mon 9/14/2009
12:00 - 13:00
44.9
Mon 9/14/2009
13:00 - 14:00
45.6
Mon 9/14/2009
14:00 - 15:00
43.5
Mon 9/14/2009
15:00 - 16:00
N/A
Project:
Position:
#3 - In the rear yard of 5823 Cardoza Drive
Date & Time:
Noted
Noise Source:
Ambient
Distance:
Varies
SLM Height:
5'
LD 820 S/N:
1632
Date
Measurement
Period
Fri 9/11/2009
16:00 - 17:00
N/A
Fri 9/11/2009
17:00 - 18:00
43.1
Fri 9/11/2009
18:00 - 19:00
43.5
Fri 9/11/2009
19:00 - 20:00
44.7
Fri 9/11/2009
20:00 - 21:00
41.6
Fri 9/11/2009
21:00 - 22:00
40.1
Fri 9/11/2009
22:00 - 23:00
41.3
Fri 9/11/2009
23:00 - 00:00
39.1
Sat 9/12/2009
00:00 - 01:00
38.6
Sat 9/12/2009
01:00 - 02:00
38.6
Sat 9/12/2009
02:00 - 03:00
38.5
Sat 9/12/2009
03:00 - 04:00
41.6
Sat 9/12/2009
04:00 - 05:00
41.7
Sat 9/12/2009
05:00 - 06:00
45.3
Sat 9/12/2009
06:00 - 07:00
45.8
Sat 9/12/2009
07:00 - 08:00
46.3
Sat 9/12/2009
08:00 - 09:00
48.0
Sat 9/12/2009
09:00 - 10:00
50.8
Sat 9/12/2009
10:00 - 11:00
43.7
Sat 9/12/2009
11:00 - 12:00
47.6
Sat 9/12/2009
12:00 - 13:00
46.3
Sat 9/12/2009
13:00 - 14:00
44.9
Sat 9/12/2009
14:00 - 15:00
44.0
Sat 9/12/2009
15:00 - 16:00
43.4
Sat 9/12/2009
16:00 - 17:00
45.2
Sat 9/12/2009
17:00 - 18:00
41.6
Sat 9/12/2009
18:00 - 19:00
40.4
Sat 9/12/2009
19:00 - 20:00
39.8
Sat 9/12/2009
20:00 - 21:00
41.2
Sat 9/12/2009
21:00 - 22:00
39.6
Sat 9/12/2009
22:00 - 23:00
37.9
Sat 9/12/2009
23:00 - 00:00
37.6
Sun 9/13/2009
00:00 - 01:00
35.8
2916
Date
Measurement
Period
Sun 9/13/2009
01:00 - 02:00
36.3
Sun 9/13/2009
02:00 - 03:00
36.2
Sun 9/13/2009
03:00 - 04:00
36.0
Sun 9/13/2009
04:00 - 05:00
36.1
Sun 9/13/2009
05:00 - 06:00
37.4
Sun 9/13/2009
06:00 - 07:00
39.8
Sun 9/13/2009
07:00 - 08:00
41.7
Sun 9/13/2009
08:00 - 09:00
41.3
Sun 9/13/2009
09:00 - 10:00
43.6
Sun 9/13/2009
10:00 - 11:00
44.0
Sun 9/13/2009
11:00 - 12:00
44.7
Sun 9/13/2009
12:00 - 13:00
46.6
Sun 9/13/2009
13:00 - 14:00
44.3
Sun 9/13/2009
14:00 - 15:00
44.7
Sun 9/13/2009
15:00 - 16:00
42.9
Sun 9/13/2009
16:00 - 17:00
48.5
Sun 9/13/2009
17:00 - 18:00
41.0
Sun 9/13/2009
18:00 - 19:00
40.1
Sun 9/13/2009
19:00 - 20:00
42.8
Sun 9/13/2009
20:00 - 21:00
40.4
Sun 9/13/2009
21:00 - 22:00
37.4
Sun 9/13/2009
22:00 - 23:00
40.9
Sun 9/13/2009
23:00 - 00:00
36.3
Mon 9/14/2009
00:00 - 01:00
35.3
Mon 9/14/2009
01:00 - 02:00
34.9
Mon 9/14/2009
02:00 - 03:00
35.0
Mon 9/14/2009
03:00 - 04:00
35.2
Mon 9/14/2009
04:00 - 05:00
37.0
Mon 9/14/2009
05:00 - 06:00
43.8
Mon 9/14/2009
06:00 - 07:00
42.6
Mon 9/14/2009
07:00 - 08:00
43.8
Mon 9/14/2009
08:00 - 09:00
47.8
Mon 9/14/2009
09:00 - 10:00
43.6
Mon 9/14/2009
10:00 - 11:00
43.8
Mon 9/14/2009
11:00 - 12:00
40.6
Mon 9/14/2009
12:00 - 13:00
45.7
Mon 9/14/2009
13:00 - 14:00
43.8
Mon 9/14/2009
14:00 - 15:00
42.0
Mon 9/14/2009
15:00 - 16:00
N/A
Project:
Position:
#4 - On the elevated slope of 5823 Cardoza Drive
Date & Time:
Noted
Noise Source:
Ambient
Distance:
Varies
SLM Height:
5'
LD 712 S/N:
0555
Date
Measurement
Period
Fri 9/11/2009
16:00 - 17:00
47.0
Fri 9/11/2009
17:00 - 18:00
47.9
Fri 9/11/2009
18:00 - 19:00
47.3
Fri 9/11/2009
19:00 - 20:00
47.7
Fri 9/11/2009
20:00 - 21:00
44.9
Fri 9/11/2009
21:00 - 22:00
44.2
Fri 9/11/2009
22:00 - 23:00
44.9
Fri 9/11/2009
23:00 - 00:00
43.6
Sat 9/12/2009
00:00 - 01:00
43.1
Sat 9/12/2009
01:00 - 02:00
43.0
Sat 9/12/2009
02:00 - 03:00
42.5
Sat 9/12/2009
03:00 - 04:00
44.3
Sat 9/12/2009
04:00 - 05:00
42.8
Sat 9/12/2009
05:00 - 06:00
47.4
Sat 9/12/2009
06:00 - 07:00
49.2
Sat 9/12/2009
07:00 - 08:00
50.9
Sat 9/12/2009
08:00 - 09:00
52.4
Sat 9/12/2009
09:00 - 10:00
55.7
Sat 9/12/2009
10:00 - 11:00
48.4
Sat 9/12/2009
11:00 - 12:00
50.5
Sat 9/12/2009
12:00 - 13:00
48.4
Sat 9/12/2009
13:00 - 14:00
49.2
Sat 9/12/2009
14:00 - 15:00
47.8
Sat 9/12/2009
15:00 - 16:00
46.9
Sat 9/12/2009
16:00 - 17:00
47.5
Sat 9/12/2009
17:00 - 18:00
45.8
Sat 9/12/2009
18:00 - 19:00
45.7
Sat 9/12/2009
19:00 - 20:00
44.8
Sat 9/12/2009
20:00 - 21:00
45.5
Sat 9/12/2009
21:00 - 22:00
44.9
Sat 9/12/2009
22:00 - 23:00
43.1
Sat 9/12/2009
23:00 - 00:00
42.1
Sun 9/13/2009
00:00 - 01:00
40.2
2916
Date
Measurement
Period
Sun 9/13/2009
01:00 - 02:00
40.9
Sun 9/13/2009
02:00 - 03:00
40.1
Sun 9/13/2009
03:00 - 04:00
39.0
Sun 9/13/2009
04:00 - 05:00
38.9
Sun 9/13/2009
05:00 - 06:00
39.3
Sun 9/13/2009
06:00 - 07:00
41.0
Sun 9/13/2009
07:00 - 08:00
45.1
Sun 9/13/2009
08:00 - 09:00
45.4
Sun 9/13/2009
09:00 - 10:00
46.0
Sun 9/13/2009
10:00 - 11:00
46.1
Sun 9/13/2009
11:00 - 12:00
46.4
Sun 9/13/2009
12:00 - 13:00
49.4
Sun 9/13/2009
13:00 - 14:00
49.0
Sun 9/13/2009
14:00 - 15:00
48.3
Sun 9/13/2009
15:00 - 16:00
46.6
Sun 9/13/2009
16:00 - 17:00
50.3
Sun 9/13/2009
17:00 - 18:00
45.9
Sun 9/13/2009
18:00 - 19:00
44.6
Sun 9/13/2009
19:00 - 20:00
45.8
Sun 9/13/2009
20:00 - 21:00
44.6
Sun 9/13/2009
21:00 - 22:00
41.4
Sun 9/13/2009
22:00 - 23:00
42.6
Sun 9/13/2009
23:00 - 00:00
37.9
Mon 9/14/2009
00:00 - 01:00
37.2
Mon 9/14/2009
01:00 - 02:00
36.3
Mon 9/14/2009
02:00 - 03:00
36.5
Mon 9/14/2009
03:00 - 04:00
37.2
Mon 9/14/2009
04:00 - 05:00
39.9
Mon 9/14/2009
05:00 - 06:00
45.7
Mon 9/14/2009
06:00 - 07:00
47.4
Mon 9/14/2009
07:00 - 08:00
48.9
Mon 9/14/2009
08:00 - 09:00
49.4
Mon 9/14/2009
09:00 - 10:00
45.9
Mon 9/14/2009
10:00 - 11:00
46.3
Mon 9/14/2009
11:00 - 12:00
45.0
Mon 9/14/2009
12:00 - 13:00
49.1
Mon 9/14/2009
13:00 - 14:00
50.0
Mon 9/14/2009
14:00 - 15:00
45.7
Mon 9/14/2009
15:00 - 16:00
N/A
Table I-5. Noise Survey
Project:
Measurement Period
Position:
09.031.01
12:17 PM
to
12:37 PM
to
to
#5 - In the front yard of 5893 Logwood Road
n*
Ln
Ln
Ln
2
63.6
8
61.2
25
58.2
50
54.4
90
44.8
99
38.9
Leq
56.8
Lmax
72.1
Lmin
38.5
Date:
July 25, 2012
Time:
Noted
Noise Source:
Traffic on Lindero Canyon Road
Distance:
Varies
SLM Height:
5'
LD 820 S/N:
1632
LD CAL200
Calibrator S/N:
2916
Operator:
David Limberg
90
80
Noise Level, dBA
70
60
50
40
30
20
10
0
0
20
40
60
80
100
Percent of Time Noise Level is Exceeded
* Leq is the average sound level during the measurement period.
Ln is the sound level exceeded n% of the time during the measurement period.
Lmax and Lmin are the maximum and minimum sound levels during the measurement period.
Project:
Measurement Period
Position:
09.031.01
12:50 PM
to
1:10 PM
to
to
#6 - Adjacent to homes on Vercelly Court (on
n*
Ln
Ln
Ln
2
72.6
8
67.3
25
63.1
50
59.9
90
56.1
99
52.6
Leq
64.1
Lmax
82.0
Lmin
50.2
sidewalk of Portola Court)
Date:
July 25, 2012
Time:
Noted
Noise Source:
Traffic on Thousand Oaks Boulevard &
Portola Court
Distance:
Varies
SLM Height:
5'
LD 820 S/N:
1632
LD CAL200
Calibrator S/N:
2916
Operator:
David Limberg
90
80
Noise Level, dBA
70
60
50
40
30
20
10
0
0
20
40
60
80
100
Project:
Measurement Period
Position:
09.031.01
2:45 PM
to
3:05 PM
to
to
#7 - In the back yard of 4201 Abbington Court
n*
Ln
Ln
Ln
2
66.7
8
64.7
25
59.6
50
53.8
90
44.1
99
41.2
Leq
59.0
Lmax
74.8
Lmin
40.8
Date:
July 25, 2012
Time:
Noted
Noise Source:
Traffic on Lindero Canyon Road
Distance:
Varies
SLM Height:
5'
LD 820 S/N:
1632
LD CAL200
Calibrator S/N:
2916
Operator:
David Limberg
90
80
Noise Level, dBA
70
60
50
40
30
20
10
0
0
20
40
60
80
100
Project:
Measurement Period
Position:
09.031.01
2:05 PM
to
2:30 PM
to
to
#8 - In the back yard of 4531 Sevenoaks Court
n*
Ln
Ln
Ln
2
64.2
8
61.8
25
58.8
50
55.6
90
51.8
99
49.9
Leq
57.7
Lmax
68.4
Lmin
49.3
Date:
July 25, 2012
Time:
Noted
Noise Source:
Traffic on Agoura Road
Distance:
Varies
SLM Height:
5'
LD 820 S/N:
1632
LD CAL200
Calibrator S/N:
2916
Operator:
David Limberg
90
80
Noise Level, dBA
70
60
50
40
30
20
10
0
0
20
40
60
80
100
Project:
Measurement Period
Position:
09.031.01
1:15 PM
to
1:35 PM
to
to
#9 - Adjacent to 49 Via Colinas
n*
Ln
Ln
Ln
2
65.3
8
61.8
25
59.7
50
56.6
90
50.3
99
46.2
Leq
59.5
Lmax
78.0
Lmin
44.5
Date:
July 25, 2012
Time:
Noted
Noise Source:
Traffic on Thousand Oaks Boulevard
Distance:
Varies
SLM Height:
5'
LD 820 S/N:
1632
LD CAL200
Calibrator S/N:
2916
Operator:
David Limberg
90
80
Noise Level, dBA
70
60
50
40
30
20
10
0
0
20
40
60
80
100
APPENDIX II
Traffic Noise Analysis
Table II-1. Distance to L dn Contour Lines, Existing
Avg.
Hard (H)
Barrier Details**
Dist.,
Ldn
Daily
or
(leave blank if none)
Sens.
at
Traffic
Traffic
Soft (S)
Height
Distance
Rec.
Sens.
Dist.*
Existing
Site?
(2-10m)
(10/30m)
to C/L
Rec.
Speed
Limit,
Arterial / Reach
mph
% Trucks
Med.
Hvy.
Distance to Ldn Contours
From Roadway Centerline, feet
60dB
65dB
70dB
75dB
80dB
LINDERO CANYON ROAD
North of Thousand Oaks Blvd
50
1.84%
0.74%
1
23,307
H
50'
72.0
583
229
76
--
--
Thousand Oaks to Russell Ranch Rd
45
1.84%
0.74%
1
24,050
H
50'
70.8
474
178
58
--
--
Russell Ranch Rd to Via Colinas
45
1.84%
0.74%
1
29,553
H
50'
71.7
556
215
70
--
--
45
1.84%
0.74%
1
42,250
H
50'
73.2
720
295
101
--
--
US 101 NB to SB Ramps
45
1.84%
0.74%
1
35,520
H
50'
72.5
636
254
85
--
--
US 101 SB Ramps to Agoura Rd
45
1.84%
0.74%
1
31,941
H
50'
72.0
586
229
76
--
--
South of Agoura Rd
45
1.84%
0.74%
1
12,713
H
50'
68.0
283
96
--
--
--
Westlake Blvd to Via Colinas
45
1.84%
0.74%
1
18,141
H
50'
69.5
378
135
45
--
--
Via Colinas to Project Exit Dwy
45
1.84%
0.74%
1
14,251
H
50'
68.5
311
108
33
--
--
Project Exit to Project Entry
45
1.84%
0.74%
1
14,251
H
50'
68.5
311
108
33
--
--
Project Entry to Lindero Canyon
45
1.84%
0.74%
1
14,251
H
50'
68.5
311
108
33
--
--
East of Lindero Canyon Rd
45
1.84%
0.74%
1
15,242
H
50'
68.8
329
115
37
--
--
Thousand Oaks Blvd to Via Rocas
40
1.84%
0.74%
1
6,876
H
50'
63.8
117
37
--
--
--
Via Rocas to Lindero Canyon Rd
40
1.84%
0.74%
1
11,943
H
50'
66.2
200
63
--
--
--
West of Lindero Canyon Rd
45
1.84%
0.74%
1
12,344
H
50'
67.9
276
93
--
--
--
45
1.84%
0.74%
1
9,308
H
50'
66.6
215
70
--
--
--
North of Lindero Canyon Rd
65
1.84%
0.74%
2
172,000
H
50'
84.5
>985
>985
857
366
133
South of Lindero Canyon Rd
65
1.84%
0.74%
2
169,000
H
50'
84.4
>985
>985
847
360
131
THOUSAND OAKS BOULEVARD
VIA COLINAS
AGOURA ROAD
US 101 Freeway
Table II-2. Distance to L dn Contour Lines, Near-Term-With-Project
Avg.
Hard (H)
Barrier Details**
Dist.,
Ldn
Daily
or
Sens.
at
Traffic
Traffic
Soft (S)
Height
Distance
Rec.
Sens.
Dist.*
Existing
Site?
(2-10m)
(10/30m)
to C/L
Rec.
Speed
Limit,
Arterial / Reach
mph
% Trucks
Med.
Hvy.
60dB
65dB
70dB
75dB
80dB
LINDERO CANYON ROAD
50
1.84%
0.74%
1
24,221
H
50'
72.2
601
237
79
--
--
45
1.84%
0.74%
1
25,183
H
50'
71.0
491
187
60
--
--
45
1.84%
0.74%
1
30,686
H
50'
71.8
571
222
73
--
--
45
1.84%
0.74%
1
43,828
H
50'
73.4
742
304
105
--
--
45
1.84%
0.74%
1
36,601
H
50'
72.6
650
261
88
--
--
45
1.84%
0.74%
1
32,526
H
50'
72.1
594
234
78
--
--
South of Agoura Rd
45
1.84%
0.74%
1
13,005
H
50'
68.1
289
98
--
--
--
45
1.84%
0.74%
1
18,703
H
50'
69.7
387
140
46
--
--
45
1.84%
0.74%
1
17,881
H
50'
69.5
374
133
44
--
--
45
1.84%
0.74%
1
15,844
H
50'
68.9
340
119
39
--
--
45
1.84%
0.74%
1
17,321
H
50'
69.3
365
129
43
--
--
45
1.84%
0.74%
1
15,863
H
50'
69.0
340
119
39
--
--
VIA COLINAS
40
1.84%
0.74%
1
7,321
H
50'
64.1
124
40
--
--
--
40
1.84%
0.74%
1
12,388
H
50'
66.4
207
65
--
--
--
45
1.84%
0.74%
1
12,563
H
50'
67.9
280
95
--
--
--
45
1.84%
0.74%
1
9,381
H
50'
66.7
216
70
--
--
--
65
1.84%
0.74%
2
172,465
H
50'
84.5
>985
>985
859
366
133
65
1.84%
0.74%
2
169,468
H
50'
84.5
>985
>985
849
361
131
AGOURA ROAD
US 101 Freeway
Table II-3. Distance to L dn Contour Lines, Future-Without-Project
Avg.
Hard (H)
Barrier Details**
Dist.,
Ldn
Daily
or
Sens.
at
Traffic
Traffic
Soft (S)
Height
Distance
Rec.
Sens.
Dist.*
Existing
Site?
(2-10m)
(10/30m)
to C/L
Rec.
Speed
Limit,
Arterial / Reach
mph
% Trucks
Med.
Hvy.
60dB
65dB
70dB
75dB
80dB
LINDERO CANYON ROAD
50
1.84%
0.74%
1
24,855
H
50'
72.3
613
242
82
--
--
45
1.84%
0.74%
1
27,252
H
50'
71.3
521
201
64
--
--
45
1.84%
0.74%
1
29,755
H
50'
71.7
559
217
70
--
--
45
1.84%
0.74%
1
51,886
H
50'
74.1
833
350
123
40
--
45
1.84%
0.74%
1
41,857
H
50'
73.2
716
293
99
--
--
45
1.84%
0.74%
1
34,979
H
50'
72.4
629
250
84
--
--
South of Agoura Rd
45
1.84%
0.74%
1
14,449
H
50'
68.5
315
109
34
--
--
45
1.84%
0.74%
1
18,743
H
50'
69.7
388
140
46
--
--
45
1.84%
0.74%
1
14,771
H
50'
68.6
321
112
35
--
--
45
1.84%
0.74%
1
14,771
H
50'
68.6
321
112
35
--
--
45
1.84%
0.74%
1
14,771
H
50'
68.6
321
112
35
--
--
45
1.84%
0.74%
1
17,116
H
50'
69.3
362
128
42
--
--
VIA COLINAS
40
1.84%
0.74%
1
7,448
H
50'
64.2
126
41
--
--
--
40
1.84%
0.74%
1
12,561
H
50'
66.4
209
66
--
--
--
45
1.84%
0.74%
1
13,670
H
50'
68.3
301
103
--
--
--
45
1.84%
0.74%
1
10,240
H
50'
67.1
233
78
--
--
--
65
1.84%
0.74%
2
175,860
H
50'
84.6
>985
>985
868
372
136
65
1.84%
0.74%
2
172,828
H
50'
84.5
>985
>985
860
367
134
AGOURA ROAD
US 101 Freeway
Table II-4. Distance to L dn Contour Lines, Future-With-Project
Avg.
Hard (H)
Barrier Details**
Dist.,
Ldn
Daily
or
Sens.
at
Traffic
Traffic
Soft (S)
Height
Distance
Rec.
Sens.
Dist.*
Existing
Site?
(2-10m)
(10/30m)
to C/L
Rec.
Speed
Limit,
Arterial / Reach
mph
% Trucks
Med.
Hvy.
60dB
65dB
70dB
75dB
80dB
LINDERO CANYON ROAD
50
1.84%
0.74%
1
25,769
H
50'
72.4
630
249
85
--
--
45
1.84%
0.74%
1
28,385
H
50'
71.5
538
208
66
--
--
45
1.84%
0.74%
1
30,888
H
50'
71.8
573
223
74
--
--
45
1.84%
0.74%
1
53,464
H
50'
74.2
852
358
127
42
--
45
1.84%
0.74%
1
42,938
H
50'
73.3
730
299
102
--
--
45
1.84%
0.74%
1
35,564
H
50'
72.5
637
254
86
--
--
South of Agoura Rd
45
1.84%
0.74%
1
14,741
H
50'
68.6
320
111
35
--
--
45
1.84%
0.74%
1
19,305
H
50'
69.8
397
144
48
--
--
45
1.84%
0.74%
1
18,401
H
50'
69.6
383
137
46
--
--
45
1.84%
0.74%
1
16,364
H
50'
69.1
349
123
40
--
--
45
1.84%
0.74%
1
17,841
H
50'
69.5
374
133
44
--
--
45
1.84%
0.74%
1
17,737
H
50'
69.4
372
132
44
--
--
VIA COLINAS
40
1.84%
0.74%
1
7,893
H
50'
64.4
134
44
--
--
--
40
1.84%
0.74%
1
13,006
H
50'
66.6
215
69
--
--
--
45
1.84%
0.74%
1
13,889
H
50'
68.4
305
105
--
--
--
45
1.84%
0.74%
1
10,313
H
50'
67.1
234
78
--
--
--
65
1.84%
0.74%
2
176,325
H
50'
84.6
>985
>985
869
373
136
65
1.84%
0.74%
2
173,296
H
50'
84.5
>985
>985
861
368
134
AGOURA ROAD
US 101 Freeway
* The following summarizes the traffic distributions used in the analysis:
Day
Evening
Night
Traffic Distribution No.
A
MT
HT
A
MT
HT
A
MT
HT
1
75.51%
1.56%
0.64%
12.57%
0.09%
0.02%
9.34%
0.19%
0.08%
2
65.83%
2.92%
2.10%
17.98%
0.20%
0.23%
9.49%
0.50%
0.75%
3
73.60%
0.90%
0.35%
13.60%
0.04%
0.04%
10.22%
0.90%
0.35%
4
69.50%
1.44%
2.40%
12.90%
0.06%
0.10%
9.60%
1.50%
2.50%
A = automobiles; MT = medium (2-axle) trucks; HT = heavy (3+ axle) trucks
The above values are adjusted as needed so that the overall medium truck and heavy truck percentages for a traffic distribution number agree with the values entered
into the "% Trucks" columns on the summary table.
** For street segments with barriers, noise levels and contour distances are only reported for locations 10m (approx. 30') or more beyond the noise barrier.

Environmental Noise Study for the Proposed Westlake Village

Transcription

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