HomeMy WebLinkAboutSDP 16-04; CARLSBAD OAKS NORTH LOT 17; NOISE STUDY; 2016-05-01HELIX
Environmental Planning
Carlsbad Oaks North Lot 17 Project
Acoustical Site Assessment Report
May 2016
Prepared for:
Moorpark Venture LP
1 000 Pioneer Way
El Cajon, CA 92020
Prepared by:
HELIX Environmental Planning, Inc.
7578 El Cajon Boulevard
La Mesa, CA 91942
ACOUSTICAL SITE ASSESSMENT REPORT
FOR THE
CARLSBAD OAKS NORTH LOT 17 PROJECT
Prepared for:
Moorpark Venture LP
1000 Pioneer Way
El Cajon, CA 92020
Prepared by:
HELIX Environmental Planning, Inc.
7578 El Cajon Boulevard
La Mesa, California 91942
May 2016
,....
TABLE OF CONTENTS
Section
EXECUTIVE SUMMARY ............................................................................................................ 1
1.0 INTRODUCTION ................................................................................................................... 1
1.1 Project Location and Description ................................................................................. 1
2.0 ENVIRONMENTAL SETTING ............................................. : ............................................... 1
2.1 Noise and Sound Level Descriptors and Terminology ................................................. 1
2.2 Noise and Vibration Sensitive Land Uses .................................................................... 2
2.3 Regulatory Framework ................................................................................................. 2
2.4 Existing Conditions ...................................................................................................... 4
2.4.1 Surrounding Land Uses ..................................................................................... 4
2.4.2 McClellan-Palomar Airport .............................................................................. 4
2.4.3 Ambient Noise Measurements .......................................................................... 4
3.0 METHODOLOGY AND SIGNIFICANCE CRITERIA ......................................................... 5
3.1 Methodology and Equipment ....................................................................................... 5
3 .2 Assumptions ................................................................................................................. 6
3.2.1 Construction ...................................................................................................... 6
3.2.2 Operation ........................................................................................................... 6
3.3 Significance Criteria ..................................................................................................... 8
4.0 IMPACTS .............................................................................................................................. 10
4.1 Issue 1: Excessive Noise Levels ................................................................................ 10
4.1.1 Impact Analysis .............................................................................................. 10
4.1.2 Mitigation Measures ....................................................................................... 11
4.1.3 Significance of Impacts After Mitigation ....................................................... 11
4.2 Issue 2: Permanent Increase in Ambient Noise ......................................................... 11
4.2.1 Impact Analysis .............................................................................................. 11
4.2.2 Mitigation Measures ....................................................................................... 12
4.2.3 Significance oflmpacts After Mitigation ....................................................... 12
4.3 Issue 3: Temporary Increase in Ambient Noise ........................................................ 12
4.3.1 Impact Analysis .............................................................................................. 12
4.3.2 Mitigation Measure ......................................................................................... 13
4.3.3 Significance oflmpacts After Mitigation ....................................................... 14
4.4 Issue 4: Excessive Ground-Borne Vibration ............................................................. 14
4.4.1 Impact Analysis .............................................................................................. 14
4.4.2 Mitigation Measures ....................................................................................... 15
4.4.3 Significance of Impacts After Mitigation ....................................................... 15
4.5 Issue 5: Airport Noise ................................................................................................ 15
4.5.1 Impact Analysis .............................................................................................. 15
4.5.2 Mitigation Measures ....................................................................................... 15
4.5.3 Significance oflmpacts After Mitigation ....................................................... 15
0
TABLE OF CONTENTS (cont.)
Section Page
5.0 LIST OF PREPARERS .......................................................................................................... 16
6.0 REFERENCES ...................................................................................................................... 17
LIST OF APPENDICES
A Carrier 30RB70 Condenser
B Existing and Future Traffic Noise Levels
C Construction Noise Modeling Outputs
LIST OF FIGURES
No. Title Follows Page
1 Regional Location Map ........................................................................................................ 2
2 Project Vicinity Map (Aerial Photograph) ........................................................................... 2
3 Site Plan ............................................................................................................................... 2
4 Ambient Noise Measurement Location .............................................................................. .4
LIST OFT ABLES
No. Title
1 Performance Standards for Non-Transportation Sources .................................................... 3
2 Noise Measurement Conditions and Results ...................................................................... 5
3 Carrier 30RB70 Condenser Noise ....................................................................................... 6
4 Project Traffic Generation by Land Use .............................................................................. 7
5 Daily Site Access Distribution ............................................................................................. 7
6 Estimated Roadway Noise Levels ..................................................................................... 12
7 Construction Equipment Noise Levels .............................................................................. 13
II
ADT
AIA
ALUCP
ANSI
County
City
CNEL
dB
dBA
FTA
HVAC
Hz
kHz
mph
mPa
NSLU
PPV
Project
RCNM
TNM
U.S.DOT
ACRONYMS
Average Daily Trips (roadway traffic)
Airport Influence Area (AIA)
Airport Land Use Compatibility Plan
American National Standards Institute
County of San Diego
City of Carlsbad
Community Noise Equivalent Level
decibel
A-weighted decibels
Federal Transit Administration
heating, ventilating, and air conditioning
Hertz
kilohertz
Day-Night level
equivalent sound level
miles per hour
micro-pascal
noise-sensitive land uses
peak particle velocity
Carlsbad Oaks North Lot 17
Roadway Construction Noise Model
sound pressure level
sound power level
Traffic Noise Model
U.S. Department of Transportation
iii
EXECUTIVE SUMMARY
This report presents an assessment of potential acoustical impacts associated with the Carlsbad
Oaks North Lot 17 Project (Project).
The proposed Project proposes an industrial building consisting with combined industrial, office,
manufacturing, and warehouse uses on approximately 8 acres within the City of Carlsbad (City).
Potential sources of noise during construction and operation of the Project include heavy
construction equipment, facility-related operational noise, truck traffic, and heating, ventilation,
and air conditioning (HVAC) units.
Facility operational noise sources such as truck travel, backup alarms, and brake release air
pressure would not exceed the City's exterior noise thresholds for the surrounding residences.
HVAC noise from the building's rooftop condensers would also be below allowable exterior
noise thresholds.
Additional traffic from the Project would not substantially increase noise levels on surrounding
roadways, and therefore would not cause significant impacts to off-site noise-sensitive land uses.
Noise caused by construction of the Project would result in temporary increases in ambient noise
levels in the vicinity. Although the City's Municipal Code does not place a limit on construction
noise levels, implementation of Mitigation Measure Noi-1 would include measures to minimize
construction noise to nearby residences, consistent with the guidelines in the Carlsbad Oaks
North Specific Plan.
The Project would not expose people working in the Project area to excessive aircraft noise from
the nearby McClellan-Palomar Airport.
The proposed Project would not violate any established noise thresholds for the City of Carlsbad.
Although the City of Vista's regulations do not apply to the Project, it should be noted that the
proposed Project would not exceed the City of Vista's noise limits for the residential uses
directly east of the Project site.
HELIX Enwonmen~Plann/ngl-------------------------------Acoustica/ Site Assessment Report for the Carlsbad Oaks North Lot 17 Project I HAC..()3/ May 2016 ES-1
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1.0 INTRODUCTION
This report includes an assessment of potential noise and vibration impacts associated with the
Carlsbad Oaks North Lot 17 (Project) proposed by Moorpark Venture LP (Project Applicant).
1.1 PROJECT LOCATION AND DESCRIPTION
The Project site is located on Lot 17 of Whiptail Loop in Carlsbad, California (see Figure 1,
Regional Location Map, and Figure 2, Project Vicinity Map [Aerial Photograph]). The Project
site is currently vacant and is 8.03 acres in area. The Project proposes the construction of a
126,171 square feet I-story (with mezzanine building) with combined office, manufacturing, and
warehouse/shipping/trucking distribution uses. The Project includes a 114,378 square feet
building footprint, 150 newly planted trees, and 136,267 square feet of paving to include
211 parking spaces (see Figure 3, Site Plan). The type of development is industrial. The City of
Carlsbad zoning and General Plan designation for the site and general area is Planned Industrial
(Pl).
2.0 ENVIRONMENTAL SETTING
2.1 NOISE AND SOUND LEVEL DESCRIPTORS AND TERMINOLOGY
All noise level or sound level values presented herein are expressed in terms of decibels (dB),
with A-weighting (dBA) to approximate the hearing sensitivity of humans. Time-averaged noise
levels are expressed by the symbol LEQ, with a specified duration. The Community Noise
Equivalent Level (CNEL) is a 24-hour average, where noise levels during the evening hours of
7:00 p.m. to 10:00 p.m. have an added 5 dB weighting, and sound levels during the nighttime
hours of 10:00 p.m. to 7:00 a.m. have an added 10 dB weighting. This is similar to the
Day-Night sound level (LoN), which is a 24-hour average with an added 10 dB weighting on the
same nighttime hours but no added weighting on the evening hours. Sound levels expressed in
CNEL are always based on dBA. These metrics are used to express noise levels for both
measurement and municipal regulations, as well as for land use guidelines and enforcement of
noise ordinances.
Sound can be described as the mechanical energy of a vibrating object transmitted by pressure
_ waves through a liquid or gaseous medium (e.g., air) to a hearing organ, such as a human ear.
Noise is defined as loud, unexpected, or annoying sound.
In the science of acoustics, the fundamental model consists of a sound ( or noise) source, a
receiver, and the propagation path between the two. The loudness of the noise source and
obstructions or atmospheric factors affecting the propagation path to the receiver determine the
sound level and characteristics of the noise perceived by the receiver. The field of acoustics deals
primarily with the propagation and control of sound.
Continuous sound can be described by frequency (pitch) and amplitude (loudness). A low-
frequency sound is perceived as low in pitch. Frequency is expressed in terms of cycles per
second, or Hertz (Hz) ( e.g., a frequency of 250 cycles per second is referred to as 250 Hz). High
HELIX EnvilDMNlnfalPIBnnhlO------------------------------
Acoustica/ Site Assessment Report for the Carlsbad Oaks North Lot 17 Project I HAC-03 I May 2016
frequencies are sometimes more conveniently expressed in kilohertz (kHz), or thousands of
Hertz. The audible frequency range for humans is generally between 20 Hz and 20,000 Hz.
The amplitude of pressure waves generated by a sound source determines the loudness of that
source. A logarithmic scale is used to describe sound pressure level (SPL) in terms of decibels
( dB). The threshold of hearing for the human ear is about O dB, which corresponds to
20 micro-Pascals (mPa).
Because decibels are logarithmic units, SPL cannot be added or subtracted through ordinary
arithmetic. Under the decibel scale, a doubling of sound energy corresponds to a 3-dB increase.
In other words, when two identical sources are each producing sound of the same loudness, the
resulting sound level at a given distance would be 3 dB higher than one source under the
same conditions.
2.2 NOISE AND VIBRATION SENSITIVE LAND USES
Noise-sensitive land uses (NSLU) are land uses that may be subject to stress and/or interference
from excessive noise, such as residential dwellings, transient lodging, dormitories, hospitals,
educational facilities, and libraries. Industrial and commercial land uses are generally not
considered sensitive to noise. NSLUs are located in the vicinity of the Project site. Off-site
NSLUs include existing single-family residential development located directly east of the Project
site.
Land uses in which ground-borne vibration could potentially interfere with operations or
equipment, such as research, manufacturing, hospitals, and university research operations
(Federal Transit Administration [FTA] 2006) are considered "vibration-sensitive." The degree of
sensitivity depends on the specific equipment that would be affected by the ground-borne
vibration. Excessive levels of ground-borne vibration of either a regular or an intermittent nature
can result in annoyance to residential uses. No vibration-sensitive land uses are located on or
within 200 feet of the Project site.
2.3 REGULATORY FRAMEWORK
City of Carlsbad Noise Guidelines Manual
According to the City Noise Guidelines Manual (City of Carlsbad 1995), Planned Industrial uses
are normally acceptable with exterior noise levels up to 65 dBA Community Noise Equivalent
Level (CNEL) and conditionally acceptable with exterior noise between 65 and 75 CNEL.
Interior noise levels of Planned Industrial buildings are not to exceed 65 dBA LEQ•
City of Carlsbad General Plan Noise Element
The City's General Plan Noise Element (City of Carlsbad 2015) establishes noise standards for
land use and allowable noise exposure. Table 1, Performance Standards for Non-Transportation
Sources provides standards for noise from non-transportation noise sources such as industrial
facilities and equipment yards. These standards apply to the noise sources as measured at the
edge of the property line.
HELIX ~mll!IMll~l'lmnr,-------------------------------Acoustica/ Site Assessment Report for the Carlsbad Oaks North Lot 17 Project I HAC-03/ May 2016 2
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Project Vicinity (Aerial Photograph)
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Table 1
PERFORMANCE STANDARDS FOR NON-TRANSPORTATION SOURCES
(AS MEASURED AT PROPERTY LINE OF SOURCE/SENSITIVE USE)
Noise Level Descriptor Daytime Nighttime
(7 a.m. to 10 p.m.) (10 p.m. to 7 a.m.)
Hourly LEQ, dB 55 45
Maximum Level, dB 75 65
Note: Each of the noise levels specified above shall be lowered by 5 dB for simple tone noises, noises consisting primarily
of speech or music, or for recurring impulsive noises.
Source: City of Carlsbad General Plan Noise Element
The General Plan's Noise Element provides updated noise/land use compatibility standards. For
industrial uses, exterior noise limits are considered acceptable up to 75 dBA CNEL, with a
transition of 70 dBA to 80 dBA CNEL being conditionally acceptable.
The Noise Element also sets acceptable limits of noise for exterior and interior environments
from transportation sources. Outdoor activity area limits for industrial uses are 70 dBA CNEL,
and interior space limits are 65 dBA CNEL. The Project site and off-site areas are within
approximately two miles of McClellan-Palomar Airport, and are within its Airport Influence
Area (AIA). An exterior noise exposure level of 65 dBA CNEL is allowable for residential uses
within the McClellan-Palomar Airport Area of Influence.
Carlsbad Oaks North Specific Plan
The Carlsbad Oaks North Specific Plan provides guidelines for the design, development, and
operation of light industrial facilities within the Carlsbad Oaks North Business Park (City of
Carlsbad 2002). The Carlsbad Oaks North Specific Plan specifies that Planned Industrial (P-M)
zoned uses on Lot 17 shall not produce noise in excess of 60 LoN as measured at the property
line and 55 LoN for repetitive noises between the hours of 6:00 p.m. to 7:00 a.m. The EIR for the
Carlsbad Oaks North Specific Plan (SCH# 2000051057; Carlsbad Oaks North Business Park -
EIR 98-08/GP A 97-05/ZC 97-05/SP 211/CT 97-13/HDP 97-10/SUP 97-07) was certified in
2004 and includes measures to ensure compatibility between the industrial uses and adjacent
residential uses (City of Carlsbad 2004). EIR Mitigation Measure LUI, which requires a
minimum 75 to 150-foot building setback (including ancillary structures, loading zones, trash
enclosures, refuse collection areas) between Lots 8, 13, and 17 and the eastern boundary. EIR
Mitigation measure LU2 requires compliance with the performance standards (including the
noise level limits) established in the Specific Plan.
HELIX Envitonmellta/Pfanni~-------------------------------
Acoustica/ Site Assessment Report for the Carlsbad Oaks North Lot 17 Project I HAC-03 I May 2016 3
City of Carlsbad Municipal Code, Chapter 8.48, Noise
Section 8.48.010 -Construction operation limitations:
It shall be unlawful to operate equipment or perform any construction in the erection, demolition,
alteration, or repair of any building or structure or the grading or excavation of land during the
following hours, except as hereinafter provided:
a. After 6 p.m. on any day, and before 7 a.m., Monday through Friday, and before 8
a.m. on Saturday;
b. All day on Sunday; and
c. On any federal holiday.
City of Vista Noise Ordinance (Municipal Code, Chapter 8.32, Noise Control)
The residential uses adjacent to the Project site's eastern boundary are located in the City of
Vista. Although the City of Vista's regulations do not apply to the Project, they are provided
here for informational purposes.
Sections 8.32.010 through 8.32.060 of the City of Vista Municipal Code pertain to Vista's
noise requirements and enforcement of violations. The Project's neighboring residential land
uses in the City of Vista are located in the Vista Business Park Specific Plan area, which has an
exterior noise limit of 70 dBA (one-hour average) during daytime and nighttime hours (City of
Vista 2014).
2.4 EXISTING CONDITIONS
2.4.1 Surrounding Land Uses
The area surrounding the Project site consists primarily of vacant land, open space, and
residential uses. Many of the surrounding parcels are undeveloped. Single-family residential
homes are located immediately east of the Project site, in the City of Vista. Open space is
located directly north, and undeveloped parcels are located directly south and west of the Project
site. A pharmaceutical company (Ionis Pharmaceuticals) is located southwest of the Project,
across Whiptail Loop.
The Project is accessed by Whiptail Loop East, which forms the southwestern boundary of the
Project site. Whiptail Loop connects with Faraday Road, approximately 0.3 miles to the south.
2.4.2 McClellan-Palomar Airport
The Project site is located within the Airport Influence Area (AIA) for McLellan-Palomar
Airport. The site not located within the 60-65 dBA CNEL noise contour, as shown in the Airport
Land Use Compatibility Plan (ALUCP) (December 2011).
2.4.3 Ambient Noise Measurements
A 15-minute noise measurement was conducted during the site visit on Friday, March 4, 2016.
No traffic counts were made, as traffic volumes were too low to provide a basis of noise model
HELIX Environmenlal/>lanning,-------------------------------
ACOUStica/ Site Assessment Report for the Carlsbad Oaks North Lot 17 Project I HAC-03 I May 2016 4
Ambient Noise Measurement Location
CARLSBAD OAKS NORTH LOT 17 PROJECT
HELIX /A 0:::::======:::::15
~ee1 Figure 4
Environmental Planning---------------------------------------------------
accuracy correlation. Measurement conditions and results are described in Table 2, Noise
Measurement Conditions and Results, and the measurement location is noted on Figure 4,
Ambient Noise Measurement Location, as Ml.
Table 2
NOISE MEASUREMENT CONDITIONS AND RESULTS
Date March 4, 2016
Conditions Light Clouds, negligible wind conditions, temperature
of aooroximately 70°F, with 40% humidity
Time 10:45 a.m. -11 :00 a.m.
Location Bv site entrance driveway
Measured Noise Level 45.4 dBA LEO
3.0 METHODOLOGY AND SIGNIFICANCE CRITERIA
3.1 METHODOLOGY AND EQUIPMENT
Off-site traffic volumes for existing and future conditions were obtained from the San Diego
Association of Governments (SANDAG) Transportation Forecast Information Center (TFIC).
Estimated Project traffic generation was provided by the Project Applicant and based on the
SANDAG (Not So) Brief Guide of Vehicular Traffic Generation Rates (SANDAG 2002). The
guide provides the overall site traffic generation and but does not provide a vehicle type
(automobiles versus trucks) composition. The estimate of heavy duty truck trips was based on
model defaults used by the CalEEMod air quality model from the Project greenhouse gas
emission report (HELIX 2016). The model assumes that approximately 8 percent of total Project
trips are generated by heavy duty trucks based on the average fleet mix for San Diego County.
All vehicle trips were assumed to be conducted during daytime hours (no nighttime operations).
The following equipment was used to measure existing noise levels at the Project site:
• Larson Davis System LD 831 Sound Level Meter
• Larson Davis Model CA250 Calibrator
• Windscreen and tripod for the sound level meter
• Digital camera
The sound level meter was field-calibrated immediately prior to the noise measurements to
ensure accuracy. All measurements were made with a meter that conforms to the American
National Standards Institute (ANSI) specifications for sound level meters (ANSI SI.4-1983
R2001). All instruments were maintained with National Bureau of Standards traceable
calibration per the manufacturers' standards.
Modeling of the outdoor noise environment for this report was accomplished using the Traffic
Noise Model (TNM) software version 2.5. The TNM was released in February 2004 by the U.S.
HELIX fnllirOMlelllall'lllnnJng, ______________________________ _
Acoustical Site Assessment Report for the Carlsbad Oaks North Lot 17 Project I HAC-03 I May 2016 5
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Department of Transportation (U.S. DOT), and calculates the daytime average hourly LEQ from
three-dimensional model inputs and traffic data.
The one-hour LEQ noise level is calculated utilizing peak-hour traffic; peak-hour traffic volumes
can be estimated based on the assumption that 15 percent of the average daily traffic would occur
during a peak hour. The model-calculated one-hour LEQ noise output is the equivalent to the
CNEL (Caltrans Technical Noise Supplement, November 2009).
Project construction noise was analyzed using the Roadway Construction Noise Model (RCNM;
U.S. DOT 2008), which utilizes estimates of sound levels from typical construction equipment.
3.2 ASSUMPTIONS
3.2.1 Construction
Construction would require heavy equipment during grading utility installations, building
construction and paving. Construction equipment utilized on-site would include but not be
limited to: dozers, excavators, graders, a crane, loaders, backhoes, and cement pumping
boom trucks.
The Project is not expected to involve blasting. The most likely source of vibration during the
Project construction would be a vibratory roller, which may be used to achieve soil compaction
as part of the foundation construction and for driveway construction.
3.2.2 Operation
Air Conditioners
Specific planning data for the future HV AC systems is not available at this stage of Project
design. The building would most likely use rooftop-mounted packaged air conditioning and
heating units. The unit used in this analysis is a Carrier 30RB70 condenser (see Appendix A,
Carrier 30RB70 Condenser). Planning is based on an assumed use of one ton of A/C for every
325 to 350 square feet of interior space. Under this assumption, approximately 23 units would
be required. The typical sound power level for a unit of this type is provided below in Table 3,
Carrier 30RB70 Condenser Noise.
Table 3
CARRIER 30RB70 CONDENSER NOISE
Noise Levels in Decibels1 (dB) Measured at Octave Frequencies
63Hz 12SHz 2S0Hz
62 78
1 Sound Power Levels (Swd
KHz = kilohertz
HELIX
83
SO0Hz
89
.
1KHz 2KHz ,4KHz 8KH.t
.'
92 87 84 74
Oyerall Noise
· Level in
A-weighted Scale
(dBA>1
95
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...
Transportation Sources
Project traffic will include vehicle traffic for several separate facilities functions. Project-
generated traffic by anticipated land use type is provided in Table 4, Project Traffic Generation
by Land Use. As mentioned earlier under Section 3 .1, approximately 8 percent of total trips ( 60
trips) were assumed to be generated by heavy duty trucks, and 696 trips were assumed to be
generated by light duty vehicles (primarily automobiles) and medium duty trucks.
Table 4
PROJECT TRAFFIC GENERATION BY LAND USE
Office Manufacturin2 Warehouse Total
Area (SF) 17,750 18,000 90,421 126,171
Trip Rate 7 10 5 ( per 1,000 SF)
Peak Hour 16-17% 14-15% 13-15% 12%LDV/MDT
15%HDT
Avera1?:e Daily Trips (ADT) 124 180 452 756
SF = square feet; LDV = light duty vehicle; MDT= medmm duty trucks; HOT= heavy duty trucks.
Sources: Estimated land use areas provided by Project Applicant. Overall peak hour and trip generation ranges are
based on the SANDAG (Not So) Brief Guide of Vehicular Traffic Generation Rates (SANDAG 2002).
Although it was assumed that Project operation would be limited to daytime hours, specific
hourly site access times and vehicles counts are not available. Table 5, Daily Site Access
Distribution, presents an estimate of the hourly distribution of site access. The worst case hours
(assumed) is used as a basis of planning impacts.
As shown in Table 4, SANDAG provides estimates of peak hour traffic based on land use type,
· but as noted earlier, does not provide a vehicle mix composition. Based on the assumption of 8
percent heavy duty trucks (60 daily trucks), the SANDAG peak hour estimates for overall traffic,
combined with a typical daily profile distribution, daily site access distribution estimates were
developed as shown in Table 5. A maximum of 9 heavy duty trucks being loaded/unloaded on
the site was used as a reasonable assumption for what the site can accommodate during a peak
hour.
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Acoustical Site Assessment Report for the Carlsbad Oaks North Lot 17 Project I HAC-03 I May 2016 7
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Table 5
DAILY SITE ACCESS DISTRIBUTION
Li2ht!Medium Duty Vehicles Heavy Duty Trucks
Hour Percent Count : Percent Count
7:00AM 12.00% 84 15.00% 9
8:00AM 10.00% 70 12.00% 7
9:00AM 8.00% 56 6.00% 4
10:00AM 5.00% 35 4.00% 2
11:00AM 6.00% 42 4.00% 2
12:00 PM 10.00% 70 5.00% 3
1:00PM 8.00% 56 5.00% 3
2:00PM 6.00% 42 4.00% 2
3:00 PM 6.00% 42 4.00% 2
4:00 PM 10.00% 70 12.00% 7
5:00 PM 12.00% 84 15.00% 9
6:00PM 4.00% 28 8.00% 5
7:00 PM 3.00% 21 6.00% 4
Note: Totals may differ slightly from listed assumptions due to rounding.
Upon entering the site, trucks would tum right and travel counter-clockwise around the building
to the loading docks. The trucks are assumed to travel at approximately 5-10 mph. Typical noise
sources associated with a loading dock include trucks and truck backup alarms. All truck loading
operations would be indoors with the trailer backed up against the door opening. Therefore, no
exterior noise impacts are analyzed for indoor forklifts and their associated backup alarms.
A heavy truck backup alarm typically generates noise of 97 dBA at 4 feet at a single frequency
of 1 kHz. The setting of the parking brake initiates a release of air pressure from the brake
spring loading system resulting in a sharp air pressure blast. This release typically creates a
noise level of about 95 dBA at five feet from the truck for approximately 0.5 seconds. The
typical backup path on the site is estimated at approximately 95 feet with a typical speed of
approximately 2 mph. The backup alarm would last approximately 33 seconds plus 10 seconds
pre and post backing up for a 43-second average time per truck.
3.3 SIGNIFICANCE CRITERIA
Based on Appendix G of the CEQA Guidelines, implementation of the Project would result in a
significant adverse impact if it would:
Threshold 1: Expose persons to or generate noise levels in excess of standards established in
the Carlsbad General Plan or noise ordinance, or applicable standards of other
agencies.
Based on the City Noise Element, exterior noise generated by the Project would be significant if
facility-related (non-transportation) noise would exceed the following noise levels: hourly
average (LEQ) of 55 dBA during daytime hours (7:00 a.m. and 10:00 p.m.) and 45 dBA LEQ
during nighttime hours (10:00 p.m. and 7:00 a.m.). Maximum exterior noise levels shall not
HELIX Envllnnmen~Plamingl-------------------------------Acoustical Site Assessment Report for the Carlsbad Oaks North Lot 17 Project I HAC-03 I May 2016 8
exceed 75 dBA daytime hours or 65 dBA during nighttime hours. For backup alarms from
heavy trucks, each of the noise levels specified above is lowered by 5 dBA. In addition, based
on the conditions in the Carlsbad Oaks North Specific Plan, uses on Lot 17 shall not produce
noise in excess of 60 LnN as measured at the property line and 55 LnN if the noise is repetitive
between the hours of 6:00 p.m. and 7:00 a.m.
Threshold 2: Result in a substantial permanent increase in ambient noise levels in the project
vicinity above levels existing without the project.
A substantial permanent increase would occur if implementation of the proposed Project results
in an ambient exterior transportation-related noise level that meets or exceeds the noise
compatibility standards established in the City of Carlsbad General Plan. This includes 65 dBA
CNEL for commercial buildings and single-family residences within the McLellan-Palomar
Airport AIA. For roadways that already meet or exceed the noise compatibility standards, a
significant impact would occur if the proposed Project results in a 3 dBA CNEL or greater
increase in traffic noise on the roadway segment. For standards associated with the Carlsbad
Oaks North Specific Plan, refer to Threshold 1.
Threshold 3: Result in a substantial temporary or periodic increase in ambient noise levels in
the project vicinity above levels existing without the project.
Construction activity would be considered significant if it violates the limits established in the
City of Carlsbad Noise Ordinance or Noise Guidelines Manual. The ordinance prohibits
construction and building work between the hours of 6:00 p.m. and 7:00 a.m. Monday through
Friday, before 8:00 a.m. on Saturday, all day Sunday, and any federal holiday.
Threshold 4: Expose persons to or generation of excessive ground-borne vibration or
ground-borne noise levels.
Excessive ground-borne vibration is defined as equal to or in excess of 0.2 in/sec peak particle
velocity (PPV). Construction activities within 200 feet and pile driving within 600 feet of a
vibration sensitive use would be potentially disruptive to vibration-sensitive operations
(Caltrans 2002).
Threshold 5: For a project located within an airport land use plan or, where such a plan has
not been adopted, within two miles of a public use airport or private airstrip,
expose people residing or working in the project area to excessive noise.
Implementation of the Project would have a significant adverse impact if it results in the
exposure of persons to or generation of noise levels in excess of standards established in the
McClellan-Palomar Airport Land Use Compatibility Plan. This includes exterior noise exposure
limits of 65 dBA CNEL for commercial and industrial offices.
HELIX EnvlroM1lillflll'lsnnlllO-------------------------------
Acoustica/ Site Assessment Report for the Carlsbad Oaks North Lot 17 Project I HAC-031 May 2016 9
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4.0 IMPACTS
4.1 ISSUE 1: EXCESSIVE NOISE LEVELS
Would the project expose persons to or generate noise levels in excess of standards established
in the City of Carlsbad General Plan or noise ordinance, or applicable standards of other
agencies?
4.1.1 Impact Analysis
4.1.1.1 Facility Use Noise
The Project includes office, manufacturing, and warehouse/shipping/trucking distribution uses.
Facility-related noise includes truck travel, backup alarms, and brake release air pressure. The
23 loading docks are located in a stepwise fashion along the northeastern edge of the proposed
building, as shown in Figure 3. The number of truck parking spaces per loading dock ranges
from 3-6 spaces. Off-site residential development is located directly east of the site. The eastern
property line is approximately 125 feet from the proposed driveway centerline of the eastern-
most loading dock, which includes three truck loading spaces. Modeling did not include walls
along the perimeter of the Project site that may be required as part of compliance with the
Specific Plan.
The analysis estimates the highest noise levels from heavy duty trucks that would occur during
the peak hours between 7:00-8:00 a.m. and 5:00-6:00 p.m. During the peak hour, 9 heavy duty
trucks would be arriving and departing distributed throughout the loading docks on the site,
generating noise from backup alarms and brake air pressure releases. During peak hours,
estimated exterior noise levels would be approximately 60 dBA LEQ in the eastern-most loading
dock area. The eastern property line is 125 feet from the closest loading dock and noise levels
would attenuate to 34 dBA LEQ at the site boundary.
The Project site is approximately 30 feet higher in elevation in relation to the residences to the
east. Shielding provided by the change in topography Project site's higher elevation would
further attenuate facility use noise from 34 dBA LEQ to less than 15 dBA LEQ at the nearest off-
site residence to the east.
The noise level limit at the property boundary for non-transportation noise sources is 55 dBA
LEQ, and lowered to 50 dBA LEQ for simple tones such as backup alarms. The limits within the
Carlsbad Oaks North Specific Plan (and EIR) for Lot 17 are 60 LoN as measured at the property
line and 55 LoN if the noise is repetitive between the hours of 6:00 p.m. and 7:00 a.m. A one-
hour LEQ measurement can be used to calculate LoN, which is the average equivalent sound level
over a 24-hour period, with a penalty added for noise during nighttime hours. A 34 dBA LEQ
caused by facility noise at the eastern property line would not exceed the 60 LoN limit as
specified in the Specific Plan. Potential noise impacts from on-site trucking operations would be
less than significant.
For informational purposes, it should be noted that this level also does not exceed the City of
Vista exterior noise limit for the adjacent residential use (70 dBA LE0).
HELIX ~wonmen~JllanninO-------------------------------Acoustical Site Assessment Report for the Carlsbad Oaks North Lot 17 Project I HAC-03/ May 2016 10
4.1.1.2 Stationary Noise (Building HVAC Units)
The eastern-most on-site rooftop HV AC would be approximately 310 feet to the nearest property
line. For this analysis, it was assumed that a three-foot parapet wall would encircle the proposed
building at the edge of the roofline, which is a standard construction practice for projects of this
type. At this distance, 23 of these units operating on a rooftop would generate noise levels of
approximately 8 dBA LEQ at the closest property line, which would not be audible above ambient
exterior noise levels. Because HV AC units cycle continuously, the more conservative exterior
noise level limit during nighttime ( 45 dBA LEQ) was used to analyze impacts. HV AC units on
the Project site would not exceed these exterior noise thresholds, and potential noise impacts
from HV AC equipment would be less than significant.
For informational purposes, it should be noted that this level also does not exceed the City of
Vista exterior noise limit for the adjacent residential use (70 dBA LEQ)-
4.1.2 Mitigation Measures
Because impacts related to Issue 1 would be less than significant, no mitigation is required.
4.1.3 Significance of Impacts After Mitigation
Impacts would be less than significant without mitigation.
4.2 ISSUE 2: PERMANENT INCREASE IN AMBIENT NOISE
Would the project result in a substantial permanent increase in ambient noise levels in the
project vicinity above levels existing without the project?
4.2.1 Impact Analysis
4.2.1.1 Off-site Transportation Noise
The proposed Project would generate approximately 756 average daily trips (ADT). For this
analysis, it is assumed that 92 percent of trips would be from automobiles and medium duty
trucks, and approximately 8 percent would be from heavy duty trucks. Using these percentages,
approximately 60 trips would consist of heavy duty trucks. The facility would be in operation
for a 10-hour day, with approximately 84 automobile and 9 heavy duty truck trips during the
peak hour.
Table 6, Estimated Roadway Noise Levels, shows the traffic noise levels along street segments
adjacent to NSLUs (such as residences) and likely to be used by Project traffic. Project traffic
accessing Interstate 5 would travel west along Palomar Airport Road via Faraday Avenue, El
Fuerte Street, and El Camino Real. These routes would travel through existing industrial areas.
Project traffic accessing Interstate 15 would travel east via Faraday Avenue and South Melrose
Drive nearby existing residential developments. For the purposes of this analysis, a conservative
estimate of 50 percent of Project traffic traveling east is assumed.
HELIX ~vilrlllmflnlllJPlaming-------------------------------Acoustical Site Assessment Report for/he Carlsbad Oaks North Lot 17 Project I HAC-031 May 2016 11
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TNM software was used to calculate the noise contour distances for Existing and Existing +
Project conditions. The off-site roadway modeling represents a conservative analysis that does
not take into account topography or attenuation provided by existing structures. As noted in
Section 3.3, a significant direct impact would occur if existing conditions approach or exceed
City standards and the Project more than doubles (increases by more than 3 dBA CNEL) the
existing noise level. Although existing exterior noise levels exceed Carlsbad standards for
residential uses (65 dBA CNEL), the Project would only increase traffic noise levels either not at
all or by a negligible amount (0.1 dBA). Therefore, exterior off-site direct transportation noise
impacts would be less than significant. Additional analysis for the 70, 65, and 60 dBA CNEL
distances are provided in Appendix B, Existing and Future Traffic Noise Levels.
Table 6
ESTIMATED ROADWAY NOISE LEVELS
/. CNELat 50feet
',
Change Roadway/Segnumt Existing+ Direct Existing Project fr~m: Impact2
Existing1
Faradav Avenue
West of South Melrose Drive 71.5 71.6 +0.1 No
South Melrose Drive
North of Faraday Avenue 75.5 75.5 0.0 No
Ex1stmg traffic volumes obtamed from SANDAG Transportat10n Forecast Information Center, Senes 13, Forecast Year 2012
Project traffic volumes obtained from SANDAG's (Not So) Brief Guide of Vehicular Traffic Generation Rates (2002)
1 Difference between Existing and Existing + Project
2 A direct impact to off-site uses would occur if the Project more than doubles (increases by more than 3 CNEL) the existing noise level
in areas that exceed City standards ( 65 CNEL for residential uses).
4.2.2 Mitigation Measures
Because impacts related to Issue 2 would be less than significant, no mitigation is required.
4.2.3 Significance of Impacts After Mitigation
Impacts would be less than significant without mitigation.
4.3 ISSUE 3: TEMPORARY INCREASE IN AMBIENT NOISE
Would the project result in a substantial temporary or periodic increase in ambient noise levels
in the project vicinity above levels existing without the project?
4.3.1 Impact Analysis
Construction of the Project would generate elevated noise levels that may disrupt nearby noise
sensitive receptors. The magnitude of the impact would depend on the type of construction
activity, equipment, duration of each construction phase, distance between the noise source and
receiver, and any intervening structures.
HELIX Enl'inlllmenllll/Jlanning--------------------------------
Acoustica/ Site Assessment Report for the Carlsbad Oaks North Lot 17 Project I HAC-03 I May 2016 12
Construction equipment would not all operate at the same time or location. No blasting would
be necessary for Project construction. For the purposes of this analysis, the two loudest pieces of
equipment (an excavator and dump truck) were assumed to be operating at the same time in a
given hour. The use of an excavator on building footings would be approximately 100 feet from
the nearest residence (located to the east of the Project site in the City of Vista). Table 7,
Construction Equipment Noise Levels, provides the 100-foot distance noise level of the
equipment used in this analysis. The construction noise model assumes that pieces of
construction equipment are only operating for a percentage of a given hour; these percentage
assumptions are incorporated into the noise level calculations provided in Table 7. Refer to
Appendix C, Construction Noise Modeling Outputs for full construction noise modeling outputs.
Table 7
CONSTRUCTION EQUIPMENT NOISE LEVELS
Unit Percent dBA LEo (1-bour) LMAX
Operatin2 Time c@.100 feet (@ 100 feet
Excavator 40 70.7 74.7
Dump Truck 40 66.5 70.4
Source: RCNM
The maximum estimated noise level would be 74. 7 dBA at a distance of 100 feet. Construction
noise would be above the hourly LEQ for non-transportation sources and below the maximum
daytime noise limit of 75 dBA at the property line as outlined in the Carlsbad General Plan (refer
to Table 1 ). Although noise from the construction of the Project would increase noise levels in
the vicinity of the Project above ambient levels for short periods of time, the City of Carlsbad
Municipal Code only restricts the hours of operation of construction equipment to the times that
are least disturbing to residents. The Municipal Code does not provide noise level limits for
construction activities. Construction activities would occur during the hours of 7:00 a.m. and
6:00 p.m. from Monday through Friday, and 8:00 a.m. and 6:00 p.m. on Saturday, within the
limits set by the City Municipal Code Section 8.48.
The Carlsbad Oaks Specific Plan includes measures for grading and materials processing during
construction to minimize noise to the extent feasible. Therefore, although the Municipal Code
does not specify a noise level limit for construction noise, reduction measures are required for
the Project to be consistent with the Specific Plan.
4.3.2 Mitigation Measure
Noi-1 Construction Noise Reduction Measures. During Project construction, the following
measures will be implemented to minimize noise to surrounding neighborhoods:
• Hours of grading and general construction shall be limited to the time period
specified in the City Municipal Code 8.48.010 (7:00 a.m. and 6:00 p.m. from
Monday through Friday, and 8:00 a.m. and 6:00 p.m. on Saturday). No grading or
construction, except in the event of an emergency, shall occur on Sundays and
designated holidays.
HELIX EnvilOnllMlllall'lallni111J-------------------------------
Acoustical Site Assessment Report for the Carlsbad Oaks Norlh Lot 17 Project I HAC-03 I May 2016 13
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• If grading activities occur within 150 feet of existing residential uses, those
grading activities shall be limited to an 8-hour period within the allowable
timeframe listed above.
• Grading and construction equipment shall be properly maintained and fitted with
standard mufflers.
• Staging areas for construction equipment shall be located as far as practicable
from adjacent residences.
• Verification shall be provided to the satisfaction of the Planning Department
Director prior to the commencement of grading.
• Hours of operation of materials operation centers (if required) shall be a minimum
of 850 feet from the northern and eastern property boundaries.
4.3.3 Significance of Impacts After Mitigation
Impacts would be less than significant implementation of the above measure.
4.4 ISSUE 4: EXCESSIVE GROUND-BORNE VIBRATION
Would the project expose persons to or generation of excessive ground-borne vibration or
ground-borne noise levels?
4.4.1 Impact Analysis
The main concern associated with ground-home vibration from this type of Project is annoyance;
however, vibration-sensitive instruments and operations, such as those found in hospitals and
laboratories, can be disrupted at much lower levels than would typically affect other uses. In
extreme cases, the vibration can cause damage to buildings, particularly those that are old or
otherwise fragile. The primary source of ground-home vibration occurring as part of the
proposed Project would be construction activity.
No pile driving or blasting is anticipated to be necessary as part of Project construction; the
loudest source of potential vibration from Project construction would be the potential use of
vibratory rollers, which may be used to achieve soil compaction as part of the foundation
construction and roadway paving.
No vibration-sensitive land uses are located within 200 feet of Project site. Residential land uses
are located directly east of the proposed Project. Excessive levels of ground-home vibration of
either a regular or an intermittent nature can result in annoyance to residential uses. An on-site
source of vibration during Project construction would be a vibratory roller (primarily used to
achieve soil compaction as part of the foundation and paving construction). A vibratory roller
creates approximately 0.210 in/sec PPV at a distance of 25 feet. Vibratory rollers are expected to
be used approximately 100 feet from the nearest occupied residence and would move throughout
the site. At this distance, temporary impacts associated with the vibratory roller ( and other
potential equipment) would be less than significant.
HELIX ~Vil'OnmenWl'lanningl-------------------------------
Acoustica/ Site Assessment Report for the Carlsbad Oaks North Lot 17 Project I HAC-03 I May 2016 14
4.4.2 Mitigation Measures
Because impacts related to Issue 4 would be less than significant, no mitigation is required.
4.4.3 Significance of Impacts After Mitigation
Impacts would be less than significant without mitigation.
4.5 ISSUE 5: AIRPORT NOISE
For a project located within an airport land use plan or, where such a plan has not been
adopted, within two miles of a public use airport or private airstrip, would the project expose
people residing or working in the project area to excessive noise?
4.5.1 Impact Analysis
The Project site is located near McLellan-Palomar Airport, approximately 1.6 miles to the
southwest. The McLellan-Palomar ALUCP sets exterior noise exposure limits for new
commercial and industrial uses within the Airport Impact Area (AIA) at 65 dBA CNEL.
According to the Airport's ALUCP, the Project site is located outside of the 60-65 dBA CNEL
contour. The Project would not expose people working in the Project area to excessive aircraft
noise. Impacts would be less than significant.
4.5.2 Mitigation Measures
Because impacts related to Issue 5 would be less than significant, no mitigation is required.
4.5.3 Significance of Impacts After Mitigation
Impacts would be less than significant without mitigation.
HELIX fllVfnlMlllll~l'lann~-------------------------------
Acoustical Site Assessment Report for the Carlsbad Oaks North Lot 17 Project I HAC-03 I May 2016 15
Jason Runyan
Charles Terry
Joanne M. Dramko, AICP
HELIX
0
5.0 LIST OF PREPARERS
Environmental Planner
Senior Acoustic Specialist
Senior Scientist, Quality Assurance Reviewer
Envir0nmllnlllll'l8nmnf1-------------------------------Acoustical Site Assessment Report for the Carlsbad Oaks North Lot 17 Project I HAC-03 I May 2016 16
6.0 REFERENCES
California Noise Insulation Standards, effective 11/01/02. Based on 1997 Uniform Building
Code, California Code of Regulations, Title 24. 2001.
California Department of Transportation
Technical Noise Supplement (TENs) Caltrans, 2009.
Transportation Related Earth borne Vibrations (TA V-02-01-R9201 ), February 2002.
City of Carlsbad
Noise Guidelines Manual, 1995
Carlsbad Oaks North Business Park Specific Plan, 2002.
Carlsbad Oaks North Business Park Specific Plan Environmental Impact Report. (EIR
98-08). April 2004
General Plan. Noise Element, 2015.
Municipal Code Ordinance No. 8.48 (Noise Ordinance), 2013.
City of Vista
City of Vista General Plan, Noise Element, 2012
City of Vista Municipal Code, Section 8.32, Noise Control. April 2014
County of San Diego
County of San Diego Noise Ordinance Sec. 36.404, 2015
Federal Highway Administration (FHW A)
FHWA Traffic Noise Model, Version 2.5. February. FHWA-PD-96-010. Washington
D.C. 2004.
Federal Transit Administration (FTA)
Transit Noise and Vibration Impact Assessment, May 2006.
McClellan-Palomar Airport Land Use Compatibility Plan (ALUCP), December 2011.
HELIX Environmental Planning
Greenhouse Gas Emissions Technical Report for the Carlsbad Oaks North Lot 17 Project,
March 2016.
SANDAG
Transportation Forecast Information Center. Available at: http://tfic.sandag.org/
(Not So) Brief Guide of Vehicular Traffic Generation Rates for the San Diego Region,
April 2002
U.S. Department of Transportation, Roadway Construction Noise Model, 2008.
Federal Transit Administration, "Transit Noise and Vibration Impact Assessment,"
May 2006.
HELIX Envttonnlellt8ll'lanmt111------------------------------
Acoustical Site Assessment Report for the Carlsbad Oaks North Lot 17 Project I HAC-03 I May 2016 17
Appendix A
CARRIER30RB70CONDENSER
Acoustic Summary For 30RB70
Project: A TT Lakeside Turpin
Prepared Bv: Mike Kolaric
Unit Parameters
Tag Name:
Model Number: ...... .
Condenser Type:
Compressor Type: .......... .
.......... 30RB70
................. 30RB070
. ........... Air Cooled
.................... Scroll
Chiller Nameplate Voltage: . ......................... 460-3-60 V-Ph-Hz
Quantity: ........................... . ..... 1
Manufacturing Source:.
Refrigerant:.. ...
Shipping Weight
Operating Weight
. ........ Charlotte, NC USA
Unit Length: ...
Unit Width:
Unit Height.. ...
Accessories and Installed Options
Freeze Protection
Suction Line Insulation
Suction Service Valves
Non-Fused Disconnect
Energy Management Module
Micro Channel
Acoustic Information (Full Load)
. ........ R410A
. ................ 3738 lb
.... 3978 lb
.... 95 in
................. 89 in
................. 90 in
Octave Band Center Frequency, Hz
Sound pressure at specified distance in a free field, dB
A-Weiohted Sound Pressure Level, dBA
Sound Power at Chiller Acoustic Center, dB
A-Weighted Sound Power, dBA
Notes
1 -Chiller Height Above Ground = 0.0 ft
2 -Horizontal Distance From Chiller to Receiver= 50.0 ft
3 -Receiver Height Above Ground = 0.0 ft
Estimated Sound Power levels -dB re: 1 picowatt
Estimated Sound Pressure levels -dB re: 20 micropascal
1 -Chiller Height Above Ground
2 -Horizontal Distance From Chiller to Receiver
3 -Receiver Height Above Ground
31
53
13
85
45
Ultra Low Sound Option
Low Ambient Head Pressure Control
Minimum Load Control
Single Point
BACnet Translator Control
Coil Trim Panels
63 125 250 500
56 62 60 60
30 46 51 56
88 94 92 92
62 78 83 89
1k
59
59
92
92
2k
54
55
86
87
Estimated sound levels given above are assumed to originate at the acoustic center of the chiller.
4k
51
52
83
84
10/18/2013
10:38AM
Bk Total
43 67
42 63
75 99
74 95
Sound pressure level data used to develop this program was determined in accordance with AHRI Standard 575 for water chillers in a
free field and ANSI/AHRI Standard 370 for air cooled chillers.
Calculation methods used in this program are patterned after the ASH RAE Guide; other ASHRAE Publications and the AHRI
Acoustical Standards. While a very significant effort has been made to insure the technical accuracy of this program, it is assumed
that the user is knowledgeable in the art of system sound estimation and is aware of the tolerances involved in real world acoustical
estimation. This program makes certain assumptions as to the dominant sound sources and sound paths which may not always be
appropriate to the real system being estimated. Because of this, no assurances can be offered that this software will always generate
an accurate sound prediction from user supplied input data. If in doubt about the estimation of expected sound levels in a space, an
Acoustical Engineer or a person with sound prediction expertise should be consulted.
Packaged Chiller Builder NACO 3.42 Page 9 of 11
Appendix B
EXISTING AND FUTURE TRAFFIC
NOISE LEVELS
Appendix B
EXISTING AND FUTURE TRAFFIC NOISE LEVELS
Existing Conditions (2012) Existing + Project
CNEL 70 65 60 CNEL @ Change at 70 65 60
@ 50 ft. CNEL CNEL CNEL 50 ft. 50 ft. CNEL CNEL CNEL
Roadway/Segment (dBA) (ft.) (ft.) (ft.) (dBA) (dBA) (ft.) (ft.) (ft.) .... "-A~: f i: "f'.i ·'f,;.~f';'") ,:· "', /. ,.,. '" ~} r :":/;':;,;:" "" ,.
W of Melrose 71.5 66 165 370 71.7 0.2 70 170 380
s Melrose Drive '·'
N of Faraday 75.5 137 310 625 75.6 0.1 137 315 630
4. • ,
Appendix C
CONSTRUCTION NOISE MODELING
OUTPUTS
Report date: 3/1/2016
Case Description:
Description
Description
Excavator
Dump Truck
Equipment
Excavator
Dump Truck
Land Use
1 Residential
Total
Roadway Construction Noise Model (RCNM),Version 1.1
----Receptor #1 ----
Baselines (dBA)
Daytime
40
Evening Night
40 40
Equipment
Spec Actual
Impact Lmax Lmax
Device Usage(%) (dBA) (dBA)
No 40 80.7
No 40 76.5
Results
Receptor Estimated
Distance Shielding
(feet) (dBA)
100 0
100 0
Calculated (dBA) Noise Limits (dBA)
Day Evening
*Lmax Leq Lmax Leq Lmax Leq
74.7 70.7 N/A N/A N/A N/A
70.4 66.5 N/A N/A N/A N/A
74.7 72.1 N/A N/A N/A N/A
*Calculated Lmax is the Loudest value.
Night
Lmax
N/A
N/A
N/A
Noise Limit Exceedance (dBA)
Day Evening Night
Leq Lmax Leq Lmax Leq Lmax Leq
N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A