HomeMy WebLinkAboutCUP 12-13; SDG&E STEEL POLE; NOISE IMPACT ANALYSIS; 2013-04-25NOISE IMPACT ANALYSIS
Sprint "SDG&E Steel Pole #2718327"
Site Number: SD34XC861 D
1926 Swallow Lane
Carlsbad, California 92009
Prepared For
DePratti, Inc.
Attention: Tim Henion
13948 Calle Bueno Ganar
Jamul, California 91935
Phone: 503-519-8591
Prepared By
Eilar Associates, Inc.
Acoustical & Environmental Consulting
321 Willowspring Drive North
Encinitas, California 92024
www .eilarassociates.com
Phone: 760-738-5570
Fax: 760-738-5227
Job #B30406N1
April 25, 2013
TABLE OF CONTENTS
Page
1.0 EXECUTIVE SUMMARY 1
2.0 INTRODUCTION 1
2.1 Project Location
2.2 Project Description
2.3 Applicable Noise Regulations
3.0 ENVIRONMENTAL SETTING 2
3.1 Existing Noise Environment
3.2 Future Noise Environment
4.0 METHODOLOGY AND EQUIPMENT 3
4.1 Methodology
4.2 Measurement Equipment
5.0 NOISE IMPACTS 4
6.0 CONCLUSION 5
7.0 CERTIFICATION 5
8.0 REFERENCES 6
FIGURES
1. Vicinity Map
2. Assessor's Parcel Map
3. Satellite Aerial Photograph
4. Topographic Map
5. Satellite Aerial Photograph Showing Equipment Noise Contours and Receiver Locations
APPENDICES
A. Project Plans, Dated January 24, 2013
B. Pertinent Sections of the City of Carlsbad Noise Guidelines Manual
C. Manufacturer Data Sheets
D. Cadna Analysis Data and Results
1.0 EXECUTIVE SUMMARY
The proposed project, the Sprint wireless telecommunications facility to be known as "SDG&E Steel
Pole #2718327" (Site Number SD34XC861 D), consists of the installation of a new equipment lease
area to contain wireless equipment cabinets and associated antennas. The project site is located at
1926 Swallow Lane in the City of Carlsbad, California.
The purpose of this report is to assess noise impacts from the proposed equipment at the Sprint
facility, and to determine if mitigation is necessary and feasible to reduce project related noise
impacts to less than significant. Noise limits specified within the City of Carlsbad Noise Guidelines
Manual must be met at neighboring property lines.
Calculations show that, as designed, exterior noise levels from the proposed Sprint equipment will
comply with the applicable noise limits defined by the City of Carlsbad at all surrounding property
lines and sensitive receivers. Additionally, interior noise levels are not expected to be compromised
by Sprint equipment on site. No mitigation is deemed necessary for attenuating exterior or interior
noise levels on site.
2.0 INTRODUCTION
This acoustical analysis report is submitted to satisfy the noise requirements of the City of Carlsbad.
Its purpose is to assess noise impacts from on-site project related mechanical noise sources, and to
determine if mitigation is necessary to reduce the noise impacts to less than significant levels.
All noise level or sound level values presented herein are expressed in terms of decibels (dB), with
A-weighting, abbreviated "dBA," to approximate the hearing sensitivity of humans. Time-averaged
noise levels are expressed by the symbol "LEa" unless a different time period is specified, "LEa" is
implied to mean a period of one hour. Some of the data may also be presented as octave-band-
filtered and/or A-octave-band-filtered data, which are a series of sound spectra centered about each
stated frequency, with half of the bandwidth above and half of the bandwidth below each stated
frequency. This data is typically used for machinery noise analysis and barrier calculations.
Sound pressure is the actual noise experienced by a human or registered by a sound level
instrument. When sound pressure is used to describe a noise source, the distance from the noise
source must be specified in order to provide complete information. Sound power, on the other hand,
is a specialized analytical method to provide information without the distance requirement, but it
may be used to calculate the sound pressure at any desired distance.
2.1 Project Location
The subject property is located at 1926 Swallow Lane in the City of Carlsbad, California. The
Assessor's Parcel Number (APN) for the site is 215-052-13. The owner of the property is the West
Bluff Condominium Association. An existing condominium complex currently occupies the site.
For a graphical representation of the site, please refer to the Vicinity Map, Assessor's Parcel Map,
Satellite Aerial Photograph, and Topographic Map provided as Figures 1 through 4, respectively.
Eilar Associates, Inc. Job #B30406N1 April 25, 2013 Page1
2.2 Project Description
The proposed project includes the installation and operation of new equipment cabinets and
associated antennas. All equipment will be mounted on a concrete slab within a seven-foot high
CMU wall enclosure at grade. The wireless equipment cabinets are the focus of this analysis, as
they are the only noise-generating equipment to be located on site. No other wireless carrier
equipment is currently located on site.
For additional project details and equipment positioning, please refer to the project plans, dated
January 24, 2013, provided in Appendix A.
2.3 Applicable Noise Standards
The noise regulations applicable to this project are limited, and are contained within the City of
Carlsbad Noise Guidelines Manual, and the Noise Element to the General Plan, which states that
noise levels outside the Palomar Airport noise impact area shall be controlled to 60 CNEL at
residential property lines, and 45 CNEL at the interior of residences. Another relevant document is
the City of Carlsbad Council Policy Statement on Wireless Communications Facilities, dated
September 21, 2001. According to these regulations, the noise limits for a single-family residential
zone are 60 CNEL and 45 CNEL for exterior and interior noise levels, respectively. Although noise
levels in the guidelines manual are set using the CNEL metric, which is typically reserved for
describing transportation noise, the noise limits will be applied as hourly decibel limits, which is a
more appropriate metric for describing mechanical noise. The proposed project site is zoned for
residential use, as are neighboring properties to the north and east. Neighboring property to the
south and west is generally open space, with some residential property beyond this area. Property
line noise limits of 60 dBA were used for this analysis for all surrounding property lines and
sensitive receivers.
Pertinent sections of the City of Carlsbad noise regulations provided as Appendix B.
3.0 ENVIRONMENTAL SETTING
3.1 Existing Noise Environment
3.1.1 Ambient Noise
An on-site inspection was conducted at 2:20 p.m. on Monday, April 22, 2013. The weather
conditions were as follows: winds at 5-7 mph, partly cloudy skies, low humidity, and temperatures
in the mid 60's. An ambient noise measurement was taken at the location of the proposed Sprint
equipment, for a duration of ten minutes. The microphone position was approximately five feet
above the existing grade. The measured noise level can be seen in Table 1. The current noise
environment primarily consists of traffic noise, with some noise from high voltage power lines
overhead and aircraft overflight.
Eilar Associates, Inc. Job #B30406N1 April 25, 2013 Page2
Table 1. On-Site Noise Measurement Conditions and Resulta
Date Monday,Apnl22,2013
Time 2:20 p.m. -2:30 p.m.
Conditions Partly cloudy skies, winds at 5-7 mph,
temperature in the mid 60's with low humidity
Measured Noise Level 50.6 dBA LEa
3.1.2 Existing Equipment Noise
There is no existing Sprint equipment on site, nor is there any other existing carrier equipment on
site. Proposed Sprint equipment is the focus of this analysis.
3.2 Future Noise Environment
The future noise environment in the vicinity of the project site will be primarily a result of the same
noise sources, as well as the noise generated by the proposed equipment at the Sprint facility.
The proposed project includes the installation of two Modcell cabinets and two EZBF battery
cabinets, model 60ECv2. The maximum noise level created by one Modcell unit is measured to be
approximately 65 dBA at five feet from the back of the cabinet. According to Alcatel Lucent, there
are no noise-generating components in the EZBF cabinet, and therefore, this equipment has not
been incorporated into calculations. Manufacturer data sheets can be found in Appendix C. In
order to incorporate the measurement of Modcell cabinet noise into the Cadna analysis, octave
band data from a previous measurement of a typical wireless equipment cabinet was adjusted to
approximate the sound spectrum. The resultant octave band data is shown in Table 2.
Table 2. Predicted Octave Band Sound Pressure Levels for On-Site Equipment at 5 Feet
Octave Band Frequency Sound Pressure Level (dB)
Location dBA lea
63 125 250 500 1K 2K 4K 8K
Modcell 4.0 78.0 68.9 60.6 60.6 59.5 55.8 57.1 48.2 65.0
No other proposed equipment is anticipated to generate a significant amount of noise on site.
4.0 METHODOLOGY AND EQUIPMENT
4.1 Methodology
Modeling of the outdoor noise environment is accomplished using Cadna Version 3.7, which is a
model-based computer program developed by OataKustik for predicting noise impacts in a wide
variety of conditions. Cadna (Computer Aided Noise Abatement) assists in the calculation,
presentation, assessment, and mitigation of noise exposure. It allows for the input of project
Eilar Associates, Inc. Job #B30406N1 April 25, 2013 Page3
information such as noise source data, barriers, structures, and topography to create a detailed
model and uses the most up-to-date calculation standards to predict outdoor noise impacts.
4.2 Measurement Equipment
Some or all of the following equipment was used at the site to measure existing ambient noise
levels:
• Larson Davis Model 720 Type 2 Sound Level Meter, Serial# 0312
• Larson Davis Model CA 150 Type 2 Calibrator, Serial # 0339
• Distance measurement wheel, digital camera
The sound level meter was field-calibrated immediately prior to the noise measurement and
checked afterwards, to ensure accuracy. All sound level measurements conducted and presented
in this report, in accordance with the regulations, were made with sound level meters that conform
to the American National Standards Institute specifications for sound level meters (ANSI S1.4-1983,
R2001 ). All instruments are maintained with National Bureau of Standards traceable calibration, per
the manufacturers' standards.
5.0 NOISE IMPACTS
Noise levels of the proposed wireless equipment were calculated using Cadna at the neighboring
residential property to the north and at the nearest on-site condominium building to the east of the
equipment area. Any other potentially noise-sensitive receivers are located at a greater distance
from proposed equipment, and therefore, the calculated receivers represent the worst-case noise
exposure, and all other property lines will be exposed to lesser noise levels due to distance
attenuation and intervening structures. Receivers were calculated at a height of five feet above
grade. Noise levels were calculated without considering the shielding provided by the proposed
seven-foot high wall around the Sprint equipment, which will provide additional sound attenuation at
surrounding ground-level receivers, but will provide little to no attenuation at second story receivers.
Results of the analysis are shown in Table 3 below. Noise contours and receiver locations are
shown in Figure 5. Additional information can be found in Appendix D.
Table 3. Calculated Wireless Facility Noise Impact Levels
Receiver Approximate Noise Limit Equipment Noise Level Receiver Location Distance to Number Equipment (ft) (dBA) (dBA)
R1 North Property Line 240 60 32.3
R2 On-Site Building 75 60 43.4
As shown above, even without the proposed seven-foot high enclosure wall in place, equipment
noise levels are expected to comply with the noise limit of 60 dBA at the nearest noise-sensitive
properties. Noise levels at these receivers are considered to be conservatively high for ground-
level receivers, as the proposed seven-foot high enclosure wall will provide additional noise
Eilar Associates, Inc. Job #B30406N1 April 25, 2013 Page4
attenuation in these locations. Noise levels shown for R2 above are expected to be representative
of noise levels at second story receivers at the adjacent condominium building, and still do not
exceed the 60 dBA threshold. Any other noise-sensitive receivers are located at a greater distance
from proposed equipment and will be exposed to lesser noise levels due to distance attenuation
and shielding provided by intervening structures. For this reason, no mitigation is deemed
necessary for attenuating exterior noise levels.
Noise impacts within on-site condominiums would also be insignificant as a result of wireless
equipment operation. Contemporary exterior building construction is expected to achieve at least
15 decibels of exterior-to-interior noise attenuation with windows opened. Therefore, in order to
meet the 45 dBA interior noise limit, noise levels at the building facade must not exceed 60 dBA.
As shown above, noise levels at the residential building facade were calculated to be 43.4 dBA
without attenuation achieved by the surrounding wall that would be experienced at first floor
receivers. As this value is less than the 60 dBA threshold, it can be concluded that interior noise
levels of the first and second story on-site condominiums will not exceed 45 dBA as a result of
wireless equipment on site. No mitigation is deemed necessary to attenuate on-site interior noise
impacts.
6.0 CONCLUSION
Calculations show that, as designed, exterior noise levels from the proposed Sprint equipment are
expected to meet the applicable noise limits defined by the City of Carlsbad at all surrounding
noise-sensitive receivers. Additionally, interior noise levels are not expected to be compromised by
Sprint equipment on site. No mitigation is deemed necessary for attenuating exterior or interior
noise levels on site.
This analysis is based upon a current worst-case scenario of anticipated, typical equipment for this
type of wireless facility. Substitution of equipment with higher noise emission levels may invalidate
the recommendations of this study. These conclusions and recommendations are based on the
best and most current project-related information available at the time this study was prepared.
7.0 CERTIFICATION
This report is based on the related project information received and measured noise levels, and
represents a true and factual analysis of the acoustical impact issues associated with the proposed
Sprint site to be known as "SDG&E Steel Pole 2718327," located at 1926 Swallow Lane in the City
of Carlsbad, California. This report was prepared by Amy Hool and Douglas Eilar.
Principal/Senior Acoustical Consultant
Ellar Associates, Inc. Job #B30406N1 April 25, 2013 Pages
8.0 REFERENCES
1. Beranek, Leo L., Acoustical Measurements, Published for the Acoustical Society of America
by the American Institute of Physics, Revised Edition, 1988.
2. City of Carlsbad Noise Guidelines Manual.
3. Harris, Cyril M., Handbook of Acoustical Measurements and Noise Control, Acoustical
Society of America, 3rd Edition, 1998.
4. Harris, Cyril M., Ph.D., Noise Control in Buildings, Original Edition, 1994.
5. Hirschom, Martin, Noise Control Reference Handbook, Revised Edition, 1989.
6. Irvine, Leland K. and Richards, Roy L., Acoustics and Noise Control Handbook for
Architects and Builders, Original Edition, 1998.
7. Knudsen, Vern 0. and Harris, Cyril M., Acoustical Designing In Architecture, American
Institute of Physics for the Acoustical Society of America, 2nd Edition, 1978.
8. Raichel, Daniel R., The Science and Applications of Acoustics, American Institute of Physics
Press for the Acoustical Society of America, 1st Edition, 2000.
Eilar Associates, Inc. Job #B30406N1 April 25, 2013 Page6
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Eilar Associates, Inc.
321 Willowspring Drive North
Encinitas, California 92024
760-738-5570
Project
Assessor's Parcel Map
Job # 830406N 1
Zoning & Property
Information
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Current Zoning 120111
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Eilar Associates, Inc.
321 Willowspring Drive North
Encinitas, California 92024
760-738-5570
Satellite Aerial Photograph
Job# B30406N1 Figure 3
Image courtesy of the U, S, Geological Survey
Eilar Associates, Inc.
321 Willowspring Drive North
Encinitas, California 92024
760-738-5570
Topographic Map
Job# B30406N1
Image courtesy of the U.S. Geological Survey
Figure 4
Ellar Aaaoclatea, Inc.
321 Wlllo-prlng Drive North
Encinitas, California 92024
780-738-5570
Satellite Aerial Photograph Showing Equipment Noise Contours and Receiver Locations
Job# B30406N1
-> 45.0dBA -> 50.0dBA -> 55.0dBA -> 60.0dBA -> 65.0dBA '
CTI > 70.0dBA -> 75.0dBA ~ -> 80.0dBA -> 85.0 dBA '
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Receiver Equipment Nol11
Number Level fdBAI
R-1 32.3
R-2 43.4
Figure 5
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APPENDIX A
Project Plans, Dated January 24, 2013
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APPENDIX B
Pertinent Sections of the City of Carlsbad Noise Guidelines Manual
gTY OF CARLSBAD
SUMMARY
Noise Guidelines Manual
The following Is a summary of the most frequently requested City noise policies. Information
contained in this summary is described in more detail In the body of the Noise Guidelines
Manual.
ees1dent1a1 Exterior Nola Standard
It Is the policy of the City that 80 decibel dB(A) CNEL Is the e>eter1or noise lewl to which
residential unls rrust be mitigated, except that for areas impacted by McClellan Palomar Airport
shall be mJtfgated to 65 decibel dB(A) CNEL
B•sldentlal lntertor Nol• Standard
Interior noise levels for all residential units shall be mitigated to 45 dB(A) CNEL when openings
to the exterior of the residence are dosed. If openings are required to be closed to meat the
Interior noise standard then mechanical ventilation shall be provided.
Ibreahold for Requiring Nots, Bepgrta on Realdentlal Prolfct
A noise report ahall be required for all residential projects wlhln the followlng noise l9ferral zones
(refer to the Carlsbad Future 201 O Noise Contour Map Figure-I or see the 1000' scale map 1
provided at the back of this document):
a. Resldentlal projects requiring a dlscratlonary permit containing five or more dwellng unls
or any rrultlple family dwelling units located wlhin or 500-feet beyond the 80 dB(A) CNEL
noise contour line of the Noise Contour Map approved as part of the Carlsbad General
Plan.
b. Within the McClellan-Palomar Airport 60 dB(A) CNEL Noise contour Une as shown on the
1996 Noise Contour Map of the McClellan-Palomar Airport Comprehensive Land Use Plan
(Q.UP) see Figure-U.
11000• scale map will be included in final document only.
Summary i
APPENDIX C
Manufacturer Data Sheets
Lucent Technologies
Bell Labs Innovations 0
Memo
Subject:Modcell 4.0/4.0B Outdoor Macrocell:
Distance Based Noise Attenuation
date: 4/28/06
from: Loren Holihan
CDMA Product Management
WH3A-331
Voice: 973 386-4783
holihan@lucent.com
The following memo is intended to provide information pertaining to distance
based noise attenuation for the Modcell 4.0/4.0B Outdoor Macrocell.
General notes:
1. Conservative calculation: Drop 3dBA each time the distance doubles.
2. At some point (distance) away from the noise source the attenuation goes up
to 6 dBA. However, for the table below the 3dBA attenuation was used to
provide conservative data.
3. Currently the point at which the attenuation goes up to 6 dBA is unknown
due to the need for testing to verify. But at 30 to 40 feet the noise level
would not be materially different from the numbers presented below.
Attenuation Table
CABINET MEASURED Calculated Calculated Calculated
AXIS NOISE (dBA) Noise (dBA) Noise (dBA) Noise (dBA)
at a distance at a at a at a
of 5 ft distance of distance of distance of
10 ft 20 ft 40 ft
FRONT 61 58 55 52
RIGHT 61 58 55 52
BACK 65 62 59 56
LEFT 60 57 54 51
Intermediate distance calculations:
At a distance of 30 ft, front= 53 dBA, right= 53 dBA, back= 57 dBA and left
= 52 dBA.
At a distance of 50 ft, front= 50 dBA, right= 50 dBA, back= 54 dBA and left
= 49 dBA.
If additional information is needed please contact:
Loren Holihan
Modce/1 4.08 NP/
Mobility Product Management
(973) 386-4783 Phone
(973) 386-6427 Fax
(973) 713-6843 Cell
-Product overview for 9928 Distributed Base Station 60ECv2 battery cabinet overview
Outdoor cabinet
60ECv2 battery cabinet overview
60ECv2 description
1n1s topic prov1oes a oescnpuon or me bUtCvL oanery caomet.
The optional 60ECv2 battery cabinet provides battery backup for the 9928 Distributed
Base Station Outdoor Cabinet. The 60ECv2 battery cabinet can contain up to (20)
12IR-145 batteries. Up to two 60ECv2 battery cabinets can be installed to the right of the
'J'JL~ v1stnouteo tlase ~tat1on Uutooor caomet.
Hole for
Padlock
(Top View)
0
0
9928 Dist BTS Outdoor
401-703-732
Issue 6 October 2012
Front
View
0
0
Rear
View
25 mm' (# 2 AWG ) Ground/Earth Lug
to Ground/Earth Bar (2 Places)
Alcatel-Lucent -Proprietary
Use pursuant to applicable agreements
2-17
-Product overview for 9928 Distributed Base Station 60ECv2 battery cabinet overview
Outdoor cabinet
60ECv2 battery cabinet dimensions
The following diagram shows the weight and dimensions for the 60ECv2 battery cabinet.
2-18
762~
_L'30·1
(--------
152 4 cm
(60")
•
•
•
•
I. 78 7 cm I
i+"-(31") --+l
• Cabinet shipping weight:
193 kg (425 lbs)
• Fully equipped cabinet
with 12IR145 batteries.
Weight: 1,093 kg (2,405 lbs)
Alcatel-Lucent -Proprietary
Use pursuant to applicable agreements
9928 Dist BTS Outdoor
401-703-732
Issue 6 October 2012
APPENDIX D
Cadna Analysis Data and Results
EILAR ASSOCIATES, INC.
Acoustical and Environmental Consulting
Cedna NCQe Model -Sound Lewla
Name ID TVDe Oktave dB} Source
we1a11tl 83 I 125 I HO I 500 I 1000 2000 I 4000 I 8000 I A I Un
Modcell L 1 Lw (cl I 92.6 I 83.5 I 75.2 I 75.2 I 74.1 70.4 I 71.7 I 62.8 I 79.6 I 93.4 Mfr/Meas
Page 1 of 3
EILAR ASSOCIATES, INC.
Acoustical and Environmental Consulting
Cadna Nohle Model • Point Sourca
Name ID Result.PWL Lw/U Helaht CoordlnatN
Dav Type Value X y z
ldBA) (m) fml (ml fml
Modcell Cabinet S 1 79.6 Lw L_1 1.52 94.42 72.47 1.52
Modcell Cabinet S 2 79.6 Lw L 1 1.52 96.08 71.80 1.52
Page 2 of 3
EILAR ASSOCIATES, INC.
Acoustical and Environmental Consulting
Cadna NolN Model • NolN Levels at Receive,..
Name ID Level Lr Height Coordinates
Day X y z
(dBA\ (m) (m) (m) (m)
North R_1 32.3 1.52 94.35 146.10 1.52
On-Site Residence R_2 43.4 1.52 117.58 65.56 1.52
Page 3 of 3
I •
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Proprietary Information
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LOOKING SOUTH AT TOWER
Looking East At Tower
Proprietary lnfonnation
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Proprietary Information
LOOKING SOUTH FROM TOWER
Looking East from Tower
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Proprietary Information
LOOKING NORTH FROM TOWER
Looking West from Tower