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HomeMy WebLinkAboutRP 15-17; JEFFERSON LUXURY APARTMENTS; INTERIOR NOISE ASSESSMENT; 2015-08-06r~ .,._ I dn ~nsul#ing, lne. 4:z4:ZB C.hisolm Trail Murrieta C.A 1:z,;r,:z phone 7t,o-411-1:z,;1 www.ldnt;onsulfing.nef fa1< 7f,o-f,B1-4141 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 [ill] ~ 1 8/6/2015 Ldn &ontluhlng, Int:.. 4M:ZfJ C.hiso/m Tr.Ji/, Murrief3 C.A '/V.i(,:Z phone 7(,o-471-1:Z~ F3Y. 1<,o-<,fJ'l-4'141 Figure 1: Proj ect Site Location ~e, R'e "'~ [fill #i~~ Q ? ~e, q\<:<e ~ Project '3;. Ill Location ,, t.,, -,e ~ ·11" ~ i ~<..' "~ ~ ~ %-.. <?, ,_-,.e ~e ~ <J!'(\", ,i-ef' ~ 1>-"'e "f, l'-"e ~~ e,\ Y'e; 2 Magnolia Ave· ~11'1 ,;,.o\ I'~<,, t, ~-~6 ~ ~ 'J. q, 0;. 1>,.'1e. 1597-02 3039 Jefferson Street Noise Report Dr. Bruce Baker P.O. Box 669 Poway, CA 92074 8/6/2015 Ldn&ontlullln!J, lne.. 4P#:t9 C.hiso/m Trail Murrieta C.A '!:t,l,:t phone 1<,o-4n-,:z~ Fa'J< 1f,o-f,S'f-4'!41 Figure 2: Proposed Project Site Plan nIIIIlJv1 l.!I[LJ N.U!!r B 3 1597-02 3039 Jefferson Street Noise Report Dr. Bruce Baker P.O. Box 669 Poway, CA 92074 ACOUSTICAL FUNDAMENTALS Ldn &ontlulllng, lne.. 4~;ig C.hiso/m irail Murrieta C.A '/;i?t,;i phone 7(,o-411-,;i~ Fa)( 7t,o-f,fJ'l-4'/41 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 r- 1.. Ldn &onllultlng, lne.. 4P#~IJ C.hiNJlm Tra,1, Murrieta C.A 'I~~ phone 1<,0-411-1~~ faJ< 1<,o-f,IJ'l-4'/41 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.~ Far. 7<,o-f,tJ'/-4'/41 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 /I""' \ , Ldn&onllulling,lne.. 4:z-4:tfJ C.hisolm frail Murrieta C.A '/:t?l,:t phone 71,o-411-1:z71 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.