HomeMy WebLinkAboutRP 15-17; JEFFERSON LUXURY APARTMENTS; INTERIOR NOISE ASSESSMENT; 2015-08-06r~ .,._
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August 6, 2015
Dr. Bruce Baker
P.O. Box 669
Poway, CA 92074
Subject: 3039 Jefferson Street Residential Development Interior Noise
Assessment -Carlsbad CA
Dear Mr. Baker:
The firm of Ldn Consulting, Inc. is pleased to submit the following noise impact
analysis for the proposed 3039 Jefferson Street Residential development in the City of
carlsbad. The purpose of the survey is to determine the estimated interior noise
levels within the residential structures and recommend mitigation measures for
compliance with the California Code of Regulations Title 24 and the City of Carlsbad
guidelines and requirements for interior noise.
PROJECT LOCATION/DESCRIPTION
The proposed site is located on approximately 0.32 acres and includes a multi-family
residential development consisting of 11 units. The project site is located along
Jefferson Street between Carlsbad Village Drive and Oak Avenue in the City of
Carlsbad. The project site address is 3039 Jefferson Street, Carlsbad, CA.
The primary noise source that affects the site is vehicular traffic from adjacent Jefferson
Street and background noise from carlsbad Village Drive located approximately 200 feet
to the north of the site. The project vicinity can be seen in Figure 1 and the project site
configuration is provided in Figure 2 below.
8/6/2015 1 1597-02 3039 Jefferson Street Noise Report
Dr. Bruce Baker
P.O. Box 669
Poway, CA 92074
Ca!lsbad Villa~ {:J
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8/6/2015
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Figure 1: Proj ect Site Location
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1597-02 3039 Jefferson Street Noise Report
Dr. Bruce Baker
P.O. Box 669
Poway, CA 92074
8/6/2015
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Figure 2: Proposed Project Site Plan
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3 1597-02 3039 Jefferson Street Noise Report
Dr. Bruce Baker
P.O. Box 669
Poway, CA 92074
ACOUSTICAL FUNDAMENTALS
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Noise is defined as unwanted or annoying sound which interferes with or disrupts
normal activities. Exposure to high noise levels has been demonstrated to cause
hearing loss. The individual human response to environmental noise is based on the
sensitivity of that individual, the type of noise that occurs and when the noise occurs.
Sound is measured on a logarithmic scale consisting of sound pressure levels known
as a decibel (dB). The sounds heard by humans typically do not consist of a single
frequency but of a broadband of frequencies having different sound pressure levels.
The method for evaluating all the frequencies of the sound is to apply an A-weighting
to reflect how the human ear responds to the different sound levels at different
frequencies. The A-weighted sound level adequately describes the instantaneous noise
whereas the equivalent sound level depicted as Leq represents a steady sound level
containing the same total acoustical energy as the actual fluctuating sound level over
a given time interval.
The Community Noise Equivalent Level (CNEL) is the 24 hour A-weighted average for
sound, with corrections for evening and nighttime hours. The corrections require an
addition of 5 decibels to sound levels in the evening hours between 7 p.m. and 10
p.m. and an addition of 10 decibels to sound levels at nighttime hours between 10
p.m. and 7 a.m. These additions are made to account for the increased sensitivity
during the evening and nighttime hours when sound appears louder. CNEL values do
not represent the actual sound level heard at any particular time, but rather
represents the total sound exposure.
Additionally, Sound Transmission Class (or STC) is an integer rating of how well
airborne sound is attenuated by a building partition. STC is widely used to rate interior
partitions, ceilings/floors, doors, windows and exterior wall configurations (see ASTM
International Classification E413 and E90). The STC number is derived from tested
sound attenuation values found at the 1/3 octave band frequencies. These
transmission-loss (TL) values are then plotted and compared to a standard reference
contour. Acoustical engineers fit these values to the appropriate TL Curve to
8/6/2015 4 1597-02 3039 Jefferson Street Noise Report
Dr. Bruce Baker
P.O. Box 669
Poway, CA 92074
Ldn&onlJultlng, lne..
4:J.4~6 C.hlsolm ira,1, Murrieta C.A 'I~~~
phone 71,o-411-1~5'1
Fay. 71,o-t,6'!-4'141
determine a single STC value found at 500 Hertz. STC is roughly the decibel reduction
in noise a partition can provide, abbreviated 'dB'.
If an 85 dB sound on one side of a wall is reduced to 50 dB on the other side, that
partition is said to have an STC of 35. This number does not apply across the range
of frequencies because the STC value is derived from a curve-fit from the tested 1/3
octave band frequencies. Any partition will have less TL at lower frequencies. For
example, a wall with an STC of 35 may provide over 40 dB of attenuation at 3000 Hz
but only 15 dB of attenuation at 125 Hz.
NOISE STANDARDS
The City of Carlsbad's Noise Guidelines Manual (1995) requires that all exterior
sensitive areas shall limit noise exposure. For noise sensitive residential land uses, the
City has adopted a policy which has established a "normally acceptable" exterior noise
level goal of 65 dBA CNEL for the outdoor areas and an interior noise level of less than
45 dBA CNEL. For residential properties identified as requiring a noise study, a study
shall be prepared by an acoustical professional. This study shall document the
projected maximum exterior noise level and mitigate the projected exterior noise level
to a maximum allowable noise level as identified in Noise Guideline Manual.
Interior noise levels should be mitigated to a maximum of 45 dBA CNEL in all habitual
rooms when the exterior of the residence are exposed to levels of 60 dBA CNEL or
more. If windows and doors are required to be closed to meet the interior noise
standard, then mechanical ventilation shall be provided per City requirements.
ANALYSIS PROCEDURES
Exterior Noise Levels
The primary source of noise impacts to the project site will be vehicular noise from
adjacent Jefferson Street and background noise from carlsbad Village Drive located
approximately 200 feet north of the project site. The projected roadway noise levels
from vehicular traffic were calculated using the methods in the Highway Noise Model
8/6/2015 5 1597-02 3039 Jefferson Street Noise Report
Dr. Bruce Baker
P.O. Box 669
Poway, CA 92074
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4P#~IJ C.hiNJlm Tra,1, Murrieta C.A 'I~~
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published by the Federal Highway Administration (FHWA Highway Traffic Noise
Prediction Model, FHWA-RD-77-108, December, 1978). The FHWA Model uses the traffic
volume, vehicle mix, speed, and roadway geometry to compute the equivalent noise
level. A spreadsheet calculation was used which computes equivalent noise levels for
each of the time periods used in the calculation of CNEL. Weighting these equivalent
noise levels and summing them gives the CNEL for the traffic projections.
Mobile noise levels radiant in an almost oblique fashion from the source and drop off
at a rate of 3 dBA for each doubling of distance under hard site conditions and at a
rate of 4.5 dBA for soft site conditions. Hard site conditions consist of concrete,
asphalt and hard pack dirt while soft site conditions exist in areas having slight grade
changes, landscaped areas and vegetation.
Hard site conditions, to determine the worst-case findings, were used to develop and
analyze the noise levels along the roadway segments. The future traffic noise model
utilizes a typical vehicle mix of 96% Autos, 2% Medium Trucks and 2% Heavy Trucks for
both roadways. The vehicle mix provides the hourly distribution percentages of
automobile, medium trucks and heavy trucks for input into the FHWA Model.
Jefferson Street and carlsbad Village Drive are expected to have 1,300 ADT and 19,700
ADT, respectively, according to the SANDAG Series 12 Traffic Prediction Model for the
year 2035. The speed limit along Jefferson Street is 35 MPH and 40 MPH for carlsbad
Village Drive. Based on the exterior noise model, the worst-case cumulative noise level
from all roadways was found to be 65.9 dBA CNEL at the site. The modeling results are
provided in Figure 4 on the following page. No noise barriers, existing structures or
topography that may affect noise levels were incorporated in the calculations. A worst-
case building fa~de noise level of 65.9 dBA CNEL was utilized for all units at all floors.
8/6/2015 6 1597-02 3039 Jefferson Street Noise Report
Dr. Bruce Baker
P.O. Box 669
Poway, CA 92074
Ldn&onllulling, lne..
4:1-4:Z.tJ t:;hiso/m frail Murrieta c;A '/:Z.,/,:Z.
phone 1<,0-411-,:z.~
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Figure 4: Future Cumulative Noise Levels
Project Name:
Project Number:
3039 Jefferson Street
15-97
Date:
Location:
3-Aug-15
cartsbad
Mix Ratio by Percent
Propagation Rule
Roadway
Jefferson Street
carlsbad Village Drive
Jefferson Street
carlsbad Village Drive
Cumulative Noise Level
Interior Noise Levels
Traffic Volumes, Mix and Speecls
Autos Med. Trucks Heavy Trucks
96.0 2.0 2.0
Hard
ADT Speed MPH CNEL @ 50 Feet 60 CNEL (Feet)
1,300 35 58.0 32
19,700 40 71.1 637
Noise Reduction due to Distance
Distance Reduction Resultant Level
28 2.52 60.5
230 -6.63 64.4
65.9 dBACNEL
The methodology used to determine the resultant interior noise levels is based upon
the exterior noise level minus the sound transmission loss as identified in the American
Society of Testing and Materials (ASTM) guidelines: E413 &E90. Standard building
construction will provide a noise reduction of approximately 12-15 dBA with a windows
open condition and a minimum 20 dBA noise reduction with the windows closed. The
exterior noise levels at the proposed structures calculated in terms of dBA are
converted to the six octave band sound pressure levels between: 125 -4000 Hertz.
Acoustical modeling of the proposed project dwelling units was performed in
accordance with the above guidelines and included combining the transmission loss for
8/6/2015 7 1597-02 3039 Jefferson Street Noise Report
Dr. Bruce Baker
P.O. Box 669
Poway, CA 92074
Ldn &onlluhtng, Int:..
4P#:tfJ C.hi6olm Trail, Murrieta C.A '/7-~7-
phone 1<,0-411-I:i~
fr,. 1(,o-{,fJ'f-4'141
each of the building components that will reduce the interior noise levels. Building
components typically include the windows, exterior doors, and exterior walls. The
total noise reduction is dependent upon the transmission loss of each building
component, their subsequent surface area, quality of the building/construction
materials, a building fac;ade and angle correction.
The interior noise level is also dependent on the acoustical energy absorbed within the
room based upon the Noise Reduction Coefficients (NRC). NRC is a scalar
representation of the amount of sound energy absorbed upon striking a particular
surface and the arithmetic value average of sound absorption coefficients indicating a
material's ability to absorb sound. The absorption coefficients for individual surface
areas such as carpet, drywall and furnishings are used to calculate the interior room
effects. The calculated building noise reduction includes both the room absorption
characteristics and the transmission loss from the exterior wall assembly.
The interior noise reduction calculations were performed using Ldn's interior noise
model. The model converts the exterior sound level to octave band frequencies and
accounts for the transmission loss, correction factors and room absorption. The floor
plans used for this analysis were provided by THT Design Consultant Group, Inc., 2015.
The following construction details were utilized for each of the building assemblies to
determine the noise reduction characteristics:
Exterior walls and roof assemblies must have a Sound Transmission Class (STC) rating
of 46 or better. Exterior walls with this rating consist of 2"x4" studs or larger, spaced
16" o.c. with R-13 insulation minimum and an exterior surface of 7/8" cement plaster
(stucco). Interior wall and ceiling surfaces shall be at least 1/2" thick gypsum or
plaster. Roof assemblies should have a minimum of 1/2" sheathing, R-19 insulation
and sealed to prevent noise leaks.
Exterior entry doors should be of solid core construction and glass assemblies should
be dual-glazed and acoustical sealant applied around the exterior edges. The window
and door assemblies are generally the weakest noise reducing component but are the
most convenient and cost effective elements to change if additional attenuation is
8/6/2015 8 1597-02 3039 Jefferson Street Noise Report
Dr. Bruce Baker
P.O. Box 669
Poway, CA 92074
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Ldn&onllulling,lne..
4:z-4:tfJ C.hisolm frail Murrieta C.A '/:t?l,:t
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Fa, 11,0-l,5'!-4'141
needed. The STC ratings for the glass assemblies and exterior entry doors were
calculated in the interior noise model and provided in the findings below.
Bathrooms, kitchens, closets and corridors are not required to meet the 45 dBA CNEL
standard and therefore were not modeled. All living areas where lower noise levels are
essential for conversation and sleep should have carpeting installed; this includes
bedrooms. The living and dining rooms were considered to have tile or hardwood
flooring and modeling to account for less noise absorption. These rooms and were
modeled to determine the interior noise reductions. If the modeled interior noise levels
were found to be higher than 45 dBA CNEL in the living areas with the minimum
assembly requirements described above additional modeling was performed to
determine the minimum STC rating for the glass assemblies to further reduce interior
noise levels below the acceptable interior threshold of 45 dBA CNEL.
FINDINGS
The exterior noise levels were determined to be as high as 66 dBA CNEL for all floor
levels. Basic calculations show that a windows open condition will typically reduce the
interior noise levels 12-15 dBA CNEL and not provide adequate interior noise mitigation.
To meet the 45 dBA CNEL interior noise standard, an overall minimum interior noise level
reduction of 21 dBA CNEL is needed for the proposed project. Therefore a closed
window condition is required to reduce interior noise levels to comply with CCR Title 24
and City of Carlsbad requirements. The windows closed condition requires that
mechanical ventilation is installed to move air within the structure and control
temperatures. The mechanical ventilation must meet the jurisdictional requirements for
these dwelling units.
The necessary Sound Transmission Class and transmission losses for all glass
assemblies are provided in Table 1. The modeled results with an anticipated interior
noise level of 45 dBA CNEL or less are provided as an Attachmentto this report.
8/6/2015 9 1597-02 3039 Jefferson Street Noise Report
Dr. Bruce Baker
P.O. Box 669
Poway, CA 92074
Ldn&ontJulllng, /ne.,
4Pl:t6 C.hi60/m Troil Murrief3 C.A '1:t¼:t
phone 1t,o-4n-,:z~
fry. 7(,0-t,6'1-4'141
Table 1: Sound Transmission Class Ratings
STC Octave Band Transmission Loss (Hz)1
Assembly Rating1
125 250 500 1000 2000 4000
Windows 26 21 20 23 25 29 32
Fixed Windows 26 17 16 22 31 35 27
Glass Doors 26 21 24 27 27 24 28
1 STC and Octave ratings used in Model
All glass assemblies should be dual-paned and acoustical sealant applied around the
exterior edges having an STC 26 rating. No impacts are anticipated with the
incorporation of the STC ratings provided in Table 1. If you have any questions, please
do not hesitate to contact me directly at (760) 473-1253 or by email at
jlouden@ldnconsulting.net.
Sincerely,
Ldn Consulting, Inc.
~
Jeremy Louden, Principal
Attachments: Interior Noise Model Results
8/6/2015 10 1597-02 3039 Jefferson Street Noise Report
INTERIOR NOISE CALCULATIONS
Project Name: 3039 Jefferson Street Ldn Consulting, Inc.
Building (s) All
Floor Level 2/3 Date: 8/3/15
Arch Plan: 1-10
Room Type: Living Project# 15-96
Exterior Noise Levels
Transmission Loss {dB}
Exterior Frequency {Hz.}
Assembly Source Area STC 125 250 500 1000 2000 4000
Stucco NBS W-50-71 585 46 27 42 44 46 49 54
Windows Milgard 164 26 21 20 23 25 29 32
Fixed Window Milgard 0 26 17 16 22 31 35 27
Glass Doors Milgard 19 26 21 24 27 27 24 28
Exterior Door NBS Monograph 77 0 26 16 14 23 30 36 26
Room Absorption (RA)
Absorption Coefficients
Interior Frequency {Hz.}
Characteristics Source NRC 125 250 500 1000 2000 4000
Carpet Army TM 5-805-4 0.28 0.15 0.17 0.12 0.32 0.52 0.30
Furnishings Army TM 5-805-4 0.45 0.32 0.29 0.42 0.58 0.60 0.48
Drywall Netwell 0.07 0.09 0.08 0.05 0.03 0.06 0.09
Overall Absorption Factor (Furnished Room) 0.8 0.56 0.54 0.59 0.93 1.18 0.87
Noise Reduction
125 250 500 1000 2000 4000
Noise Reduction from Absorption based upon Floor Area -26.8 -26.8 -26.8 -26.8 -26.8 -26.8
Noise Level Increase for Defects and Exposed Surface Area 18.0 18.0 18.0 18.0 18.0 18.0
Overall Reduction from Tranmission Loss+ Room Absorption -Surface Exposure 25.5
Building Fa<;ade Noise Level (dBA CNEL) 65.9
INTERIOR NOISE CALCULATIONS
Project Name: 3039 Jefferson Street
Building (s) All
Floor Level 2/3
Arch Plan: 1-10
Room Type: Master Bedroom
Exterior Noise Levels
Exterior
Assembly Source Area
Stucco NBS W-50-71 117
Windows Milgard 0
Fixed Window Milgard 0
Glass Doors Milgard 45
Exterior Door NBS Monograph 77 0
Room Absorption (RA}
Interior
Characteristics Source
Carpet Army TM 5-805-4
Furnishings Army TM 5-805-4
Drywall Netwell
Overall Absorption Factor (Furnished Room)
Noise Reduction
Noise Reduction from Absorption based upon Floor Area
Noise Level Increase for Defects and Exposed Surface Area
STC
46
26
26
26
26
NRC
0.28
0.45
0.07
0.8
Overall Reduction from Tranmission Loss + Room Absorption -Surfa
Building Fac;ade Noise Level (dBA CNEL)
125
27
21
17
21
16
125
0.15
0.32
0.09
0.56
125
-22.2
15.7
ce Exposure
Ldn Consulting, Inc.
Date: 8/3/15
Project# 15-96
Transmission Loss (dB}
Frequency (Hz.}
250 500 1000 2000 4000
42 44 46 49 54
20 23 25 29 32
16 22 31 35 27
24 27 27 24 28
14 23 30 36 26
Absorption Coefficients
Frequency (Hz.}
250 500 1000 2000 4000
0.17 0.12 0.32 0.52 0.30
0.29 0.42 0.58 0.60 0.48
0.08 0.05 0.03 0.06 0.09
0.54 0.59 0.93 1.18 0.87
250 500 1000 2000 4000
-22.2 -22.2 -22.2 -22.2 -22.2
15.7 15.7 15.7 15.7 15.7
27.3
65.9
Resultant Interior Noise Level (dBA CNEL) 39
* Corrections for Fac;ade Level was accounted for in the modeling.
INTERIOR NOISE CALCULATIONS
Project Name:
Building (s)
Floor Level
Arch Plan:
Room Type:
3039 Jefferson Street
All
2/3
1-10
Bedroom 1
Exterior Noise Levels
Exterior
Assembly Source
Stucco NBS W-50-71
Windows Milgard
Fixed Window Milgard
Glass Doors Milgard
Exterior Door NBS Monograph 77
Room Absorption (RA)
Interior
Characteristics Source
Carpet Army TM 5-805-4
Furnishings Army TM 5-805-4
Drywall Netwell
Overall Absorption Factor (Furnished Room)
Noise Reduction
Area
234
20
0
0
0
Noise Reduction from Absorption based upon Floor Area
Noise Level Increase for Defects and Exposed Surface Area
STC
46
26
26
26
26
NRC
0.28
0.45
0.07
0.8
Overall Reduction from Tranmission Loss + Room Absorption -Surfa
Building Fac;ade Noise Level (dBA CNEL)
125 250
27 42
21 20
17 16
21 24
16 14
125 250
0.15 0.17
0.32 0.29
0.09 0.08
0.56 0.54
125 250
-20.6 -20.6
15.6 15.6
ce Exposure
Ldn Consulting, Inc.
Date: 8/3/15
Project # 15-96
Transmission Loss {dB)
Frequency {Hz.)
500 1000 2000 4000
44 46 49 54
23 25 29 32
22 31 35 27
27 27 24 28
23 30 36 26
Absorption Coefficients
Frequency {Hz.)
500 1000 2000 4000
0.12 0.32 0.52 0.30
0.42 0.58 0.60 0.48
0.05 0.03 0.06 0.09
0.59 0.93 1.18 0.87
500 1000 2000 4000
-20.6 -20.6 -20.6 -20.6
15.6 15.6 15.6 15.6
28.3
65.9
Resultant Interior Noise Level (dBA CNEL) 38
* Corrections for Fac;ade Level was accounted for in the modeling.
INTERIOR NOISE CALCULATIONS
Project Name:
Building (s)
Floor Level
Arch Plan:
Room Type:
3039 Jefferson Street
All
2/3
1-10
Bedroom 2
Exterior Noise Levels
Exterior
Assembly
Stucco
Windows
Fixed Window
Glass Doors
Exterior Door
Source
NBS W-50-71
Milgard
Milgard
Milgard
NBS Monograph 77
Room Absorption (RAJ
Interior
Characteristics Source
Carpet Army TM 5-805-4
Furnishings Army TM 5-805-4
Drywall Netwell
Overall Absorption Factor (Furnished Room)
Noise Reduction
Area
99
30
0
0
0
Noise Reduction from Absorption based upon Floor Area
Noise Level Increase for Defects and Exposed Surface Area
STC
46
26
26
26
26
NRC
0.28
0.45
0.07
0.8
Overall Reduction from Tranmission Loss + Room Absorption -Surfa
Building Fa<;ade Noise Level (dBA CNEL)
125 250
27 42
21 20
17 16
21 24
16 14
125 250
0.15 0.17
0.32 0.29
0.09 0.08
0.56 0.54
125 250
-20.7 -20.7
15.4 15.4
ce Exposure
Ldn Consulting, Inc.
Date: 8/3/15
Project # 15-96
Transmission Loss {dB)
Frequency {Hz.)
500 1000 2000 4000
44 46 49 54
23 25 29 32
22 31 35 27
27 27 24 28
23 30 36 26
Absorption Coefficients
Frequency {Hz.)
500 1000 2000 4000
0.12 0.32 0.52 0.30
0.42 0.58 0.60 0.48
0.05 0.03 0.06 0.09
0.59 0.93 1.18 0.87
500 1000 2000 4000
-20.7 -20.7 -20.7 -20.7
15.4 15.4 15.4 15.4
24.4
65.9
Resultant Interior Noise Level (dBA CNEL) 41
* Corrections for Fac;ade Level was accounted for in the modeling.
INTERIOR NOISE CALCULATIONS
Project Name: 3039 Jefferson Street
Building (s) All
Floor Level 4
Arch Plan: 9/10
Room Type: Living
Exterior Noise Levels
Exterior
Assembly
Stucco
Windows
Fixed Window
Glass Doors
Exterior Door
Source
NBS W-50-71
Milgard
Milgard
Milgard
NBS Monograph 77
Room Absorption (RAJ
Interior
Characteristics Source
Carpet Army TM 5-805-4
Furnishings Army TM 5-805-4
Drywall Netwell
Overall Absorption Factor (Furnished Room)
Noise Reduction
Area
486
130
0
25
0
Noise Reduction from Absorption based upon Floor Area
Noise Level Increase for Defects and Exposed Surface Area
STC
46
26
26
26
26
NRC
0.28
0.45
0.07
0.8
Overall Reduction from Tranmission Loss + Room Absorption -Surfa
Building Fac;ade Noise Level (dBA CNEL)
125 250
27 42
21 20
17 16
21 24
16 14
125 250
0.15 0.17
0.32 0.29
0.09 0.08
0.56 0.54
125 250
-26.1 -26.1
17.9 17.9
ce Exposure
Ldn Consulting, Inc.
Date: 8/3/15
Project# 15-96
Transmission Loss (dB)
Frequency (Hz.)
500 1000 2000 4000
44 46 49 54
23 25 29 32
22 31 35 27
27 27 24 28
23 30 36 26
Absorption Coefficients
Frequency (Hz.)
500 1000 2000 4000
0.12 0.32 0.52 0.30
0.42 0.58 0.60 0.48
0.05 0.03 0.06 0.09
0.59 0.93 1.18 0.87
500 1000 2000 4000
-26.1 -26.1 -26.1 -26.1
17.9 17.9 17.9 17.9
25.5
65.9
Resultant Interior Noise Level (dBA CNEL) 40
* Corrections for Fa<;ade Level was accounted for in the modeling.
r
INTERIOR NOISE CALCULATIONS
Project Name:
Building (s)
Floor Level
Arch Plan:
Room Type:
3039 Jefferson Street
All
4
11
Living
Exterior Noise Levels
Exterior
Assembly Source
Stucco NBS W-50-71
Windows Milgard
Fixed Window Milgard
Glass Doors Milgard
Exterior Door NBS Monograph 77
Room Absorption (RAJ
Interior
Characteristics Source
Carpet Army TM 5-805-4
Furnishings Army TM 5-805-4
Drywall Netwell
Overall Absorption Factor (Furnished Room)
Noise Reduction
Area
432
100
0
45
0
Noise Reduction from Absorption based upon Floor Area
Noise Level Increase for Defects and Exposed Surface Area
STC 125
46 27
26 21
26 17
26 21
26 16
NRC 125
0.28 0.15
0.45 0.32
0.07 0.09
0.8 0.56
125
-26.2
18.0
Overall Reduction from Tranmission Loss+ Room Absorption -Surfac e Exposure
Building Fa<;ade Noise Level (dBA CNEL)
Ldn Consulting, Inc.
Date: 8/3/15
Project # 15-96
Transmission Loss {dB}
Frequency {Hz.}
250 500 1000 2000 4000
42 44 46 49 54
20 23 25 29 32
16 22 31 35 27
24 27 27 24 28
14 23 30 36 26
Absorption Coefficients
Frequency {Hz.}
250 500 1000 2000 4000
0.17 0.12 0.32 0.52 0.30
0.29 0.42 0.58 0.60 0.48
0.08 0.05 0.03 0.06 0.09
0.54 0.59 0.93 1.18 0.87
250 500 1000 2000 4000
-26.2 -26.2 -26.2 -26.2 -26.2
18.0 18.0 18.0 18.0 18.0
25.9
65.9
Resultant Interior Noise Level (dBA CNEL) 40
* Corrections for Fac;ade Level was accounted for in the modeling.
INTERIOR NOISE CALCULATIONS
Project Name:
Building (s)
Floor Level
Arch Plan:
Room Type:
3039 Jefferson Street
All
4
11
Bedroom 1
Exterior Noise Levels
Exterior
Assembly
Stucco
Windows
Fixed Window
Glass Doors
Exterior Door
Source
NBS W-50-71
Milgard
Milgard
Milgard
NBS Monograph 77
Room Absorption (RAJ
Interior
Characteristics Source
Carpet Army TM 5-805-4
Furnishings Army TM 5-805-4
Drywall Netwell
Overall Absorption Factor (Furnished Room)
Noise Reduction
Area
315
20
0
0
0
Noise Reduction from Absorption based upon Floor Area
Noise Level Increase for Defects and Exposed Surface Area
STC
46
26
26
26
26
NRC
0.28
0.45
0.07
0.8
Overall Reduction from Tranmission Loss + Room Absorption -Surfa
Building Fac;ade Noise Level (dBA CNEL)
12S
27
21
17
21
16
125
0.15
0.32
0.09
0.56
125
-22.2
15.8
ce Exposure
Ldn Consulting, Inc.
Date: 8/3/15
Project # 15-96
Transmission Loss {dB}
Frequency {Hz.}
250 500 1000 2000 4000
42 44 46 49 54
20 23 25 29 32
16 22 31 35 27
24 27 27 24 28
14 23 30 36 26
Absorption Coefficients
Frequency {Hz.)
250 500 1000 2000 4000
0.17 0.12 0.32 0.52 0.30
0.29 0.42 0.58 0.60 0.48
0.08 0.05 0.03 0.06 0.09
0.54 0.59 0.93 1.18 0.87
250 500 1000 2000 4000
-22.2 -22.2 -22.2 -22.2 -22.2
15.8 15.8 15.8 15.8 15.8
29.6
65.9
Resultant Interior Noise Level (dBA CNEL) 36
* Corrections for Fa~ade Level was accounted for in the modeling.
INTERIOR NOISE CALCULATIONS
Project Name:
Building (s)
Floor Level
Arch Plan:
Room Type:
3039 Jefferson Street
All
4
11
Bedroom 2
Exterior Noise Levels
Exterior
Assembly Source
Stucco NBS W-50-71
Windows Milgard
Fixed Window Milgard
Glass Doors Milgard
Exterior Door NBS Monograph 77
Room Absorption (RAJ
Interior
Characteristics Source
Carpet Army TM 5-805-4
Furnishings Army TM 5-805-4
Drywall Netwell
Overall Absorption Factor (Furnished Room)
Noise Reduction
Area
108
20
0
0
0
Noise Reduction from Absorption based upon Floor Area
Noise Level Increase for Defects and Exposed Surface Area
STC 125
46 27
26 21
26 17
26 21
26 16
NRC 125
0.28 0.15
0.45 0.32
0.07 0.09
0.8 0.56
125
-20.7
15.2
Overall Reduction from Tranmission Loss + Room Absorption -Surfac e Exposure
Building Fac;ade Noise Level (dBA CNEL)
250
42
20
16
24
14
250
0.17
0.29
0.08
0.54
250
-20.7
15.2
Ldn Consulting, Inc.
Date: 8/3/15
Project # 15-96
Transmission Loss (dB}
Frequency (Hz.}
500 1000 2000 4000
44 46 49 54
23 25 29 32
22 31 35 27
27 27 24 28
23 30 36 26
Absorption Coefficients
Frequency (Hz.}
500 1000 2000 4000
0.12 0.32 0.52 0.30
0.42 0.58 0.60 0.48
0.05 0.03 0.06 0.09
0.59 0.93 1.18 0.87
500 1000 2000 4000
-20.7 -20.7 -20.7 -20.7
15.2 15.2 15.2 15.2
25.9
65.9
Resultant Interior Noise Level (dBA CNEL) 40
* Corrections for Fa~ade Level was accounted for in the modeling.