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HomeMy WebLinkAboutAMEND 2017-0016; TOWN HOUSE; INTERIOR NOISE EVALUATION; 2017-09-1242428 Chlsolm Trail, Murrieta, CA 92562 phone 760-473-1253 www.ldnconsulting.net fax760-689-4943 September 12, 2017 Mark Benjamin Archipelago Development 2685 State Street Carlsbad, CA 92008 Sul^ect: Town House Interior Noise Evaluation In Carlsbad CA The film of Ldn Consulbng, Inc. is pleased to submit the following intenor noise impact analysis for the proposed Town House residenbal development in the Oty of Carlsbad. The purpose of the survey is to determine the esbmated extenor and intenor noise levels within the outdoor areas of the project site and within the residenbal structures and recommend mibgabon measures for compliance with the California Code of Regulabons Titie 24 and the City of Carlsbad guidelines and requirements for noise. PROJECT LOCATION/DESCRIPTTON The proposed site is located on approximately 0.22 acres and consists of three (3) mulb-family residenbal condominium units and five (5) office units in a three-story building. The proposed project IS located at 2677 State Street, west of Interstate 5 in the City of Carlsbad, CA. The pnmary noise source that affects the site is the San Diego Northern Railway (SDNR) located approximately 205 feet west of the site and traffic along State Street as can be seen in Figure 1. The project site configurabon is provided in Rgure 2 below ACOUSTICAL FUNDAMENTALS Noise IS defined as unwanted or annoying sound which interferes with or disrupts normal actMbes. Exposure to high noise levels has been demonstrated to cause heanng 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 9/12/2017 1 1709-04 Town House Noise Report Mark Benjamin Archipelago Development 2685 State Street Carlsbad, CA 92008 42428 Chisolm Trait, Murrieta, CA 92562 ptJone 760-473-1253 Fax 760-689-4943 Figure 1: Project Site Location X •>\ r • ^. K w '\t ti' > '•j X -f 'r«-:«i. A v\x- V \^v ^ > IIP^ i •^v IL\ .y^.' V ■'"• ?•', ■ -• y F. 9/12/2017 1709-04 Town House Noise Report Mark Benjamin Archipelago Development 2685 State Street Carlsbad, CA 92008 42428 Chisolm Trail, Mumeta, CA 92562 phone 760-473-1253 Fax760-689-4943 Figure 2: Proposed Project Site Plan <$) -m JW TMH m^Oi] A/> I 21 9/12/2017 1709-04 Town House Noise Report Mark Benjamin Archipelago Development 2685 State Street Carisbad, CA 92008 42428 Chlsolm Trail, Mumeta, CA 92562 phone 760-473-1253 Fax760-689-4943 Sound IS measured on a loganthmic scale consisting of sound pressure levels known as a deabel (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 frequenaes The A-weighted sound level adequately descnbes 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 deabels to sound levels at nighttime hours between 10 p.m. and 7 am. These additions are made to account for the inaeased 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 intenor partitions, ceilings/floors, doors, windows and extenor wall configurations (see ASTM International Qassification 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 appropnate TL Curve to detennine 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 frequenaes because the STC value is derived from a curve-fit from the tested 1/3 octave band frequenaes. 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. 9/12/2017 1709-04 Town House Noise Report Mark Benjamin Archipelago Development 2685 State Street Carisbad, CA 92008 42428 Chisolm Trail, Mumeta, CA 92562 phone 760-473-1253 Fax760-689-4943 INTERIOR NOISE STANDARDS California's Title 24 Noise Standards The California Commission on Housing and Community Development adopted noise insulaton standards for multi-family residential buildings (Title 24, Part 2, California Code of Regulations or CCR). CCR Title 24 establishes standards, based on the U.S. Department of Housing and Urban Development (HUD) requirements, for intenor room noise (attnbutable to outside noise sources). The regulabons also specify that acoustical studies must be prepared whenever a multi-family residenbal or motel/hotel building or structure is proposed to be located near an existing or adopted freeway route, expressway, parkway, major street, thoroughfare, rail line, rapid transit line, or industrial noise source, and where such noise sources create an extenor CNEL (or Ldn) of 60 dBA or greater. Such acoustical analysis must demonstrate that the residence has been designed to limit intruding noise to an intenor CNEL (or Ldn) of at least 45 dBA. City of Carlsbad Noise Standards The City of Carlsbad's General Plan Noise Element requires that all extenor sensitive areas shall limit noise exposure. For noise sensibve residenbal land uses, the Qty has adopted a policy which has established a "normally acceptable" exterior noise level goal of 60 dBA CNEL for the outdoor areas and an interior noise level of less than 45 dBA CNEL. However, the City has also established a "condibonally acceptable" policy goal of up to 65 dBA CNEL for residential land uses. For residential properbes idenbfied as requiring a noise study, a study shall be prepared by an acousbcal professional. This study shall document the projected maximum exterior noise level and mibgate the projected exterior noise level to a maximum allowable noise level Intenor noise levels should be mitigated to a maximum of 45 dBA CNEL in all habitual rooms when the extenor 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 venblabon shall be provided per City requirements 9/12/2017 1709-04 Town House Noise Report Mark Benjamin Archipelago Development 2685 State Street Carlsbad, CA 92008 42428 Chisolm Trail, Murrteta, CA 92562 phone 760-473-1253 Fax760-689-4943 ANALYSIS PROCEDURES Exterior Noise Leveis Rail Activities Noise measurements were taken at the site using a Larson-Davis Model LxT Type 1 precision sound level meter. The noise level meter was programmed in "slow" mode and set to record noise levels in "A" weighted form. The sound level meter and microphone were mounted on a tnpod, five feet above the ground and equipped with a windscreen dunng all measurements. The sound level meter was calibrated before and after the monitonng using a Larson-Davis calibrator. Model CAL 200. The site was monitored in 1-minute intervals or increments so the tram activities could be easily identfied The noise measurement was conducted along the western portion of the site facing the rail alignment dunng a tram pass-by event to determine the noise levels from the tram activity The result of the noise level measurement is presented m Table 1. Table 1: Measured Train Noise Levels Noise Levels (dBA) Description Lmax Lmin LID L50 East of Rail nght-of-way January 27, 2017 Due to the proximity of the noise measurement to the railroad the overall sound level was found to be 72 9 dBA CNEL for a single event lasbng less than 2-mmutes. Based on existing tram schedules, the peak hourly traffic volume is expected to be four (4) trams per hour. The stabstical indicators LIO, L50, and L90, are also given Based on the L90 data, 90% of the bme the noise level is below 47 dBA due to very low traffic volumes adjacent to and around the site. The San Diego Northern Railway (SDNR) segment adjacent to the project site is utilized for both commuter trams (Coaster and Surflmer) and a few freight trams. As can be seen from the Lmax data, the tram horn at a nearby grade crossing was 87.8 dBA. The noise levels at the site are relatively low but the tram noise elevates the overall noise levels above 60 dBA CNEL. 9/12/2017 1709-04 Town House Noise Report Mark Benjamin ««« Chisolm Trail, Mumeta, CA 925622685 State Street 760-473-1253 Carlsbad, CA 92008 Fax760-689-4943 Hourly noise levels at the proposed building fagade would be further reduced due to distance, duty-cycle, and exisbng and proposed site features. The noise reduction due to distance and a duty-cycle of 8 minutes in an hour is and 8.8 dBA CNEL The worst-case daily tram activity is as follows: 50 commuter tram and freight trams (Source: NTCD, AMTRAK and SANDAG, 2014). By the year 2030, rail operations are assumed to increase to a total of 98 trams per day due to overall growth, the addition of Metrolmk Commuter Service and planned infrastructure upgrades. This would result m a noise level increase of 2.9 dBA CNEL, raising the noise levels to approximately 65 dBA CNEL. Based upon these findings and the instantaneous peaks from the tram operations, intenor noise levels need to be reduced to meet the CCR Title 24 and Qty of Carlsbad requirements. Traffic on State Street The pnmary source of traffic noise impacts to the project site will be from adjacent State Street. The projected roadway noise levels fixim vehicular traffic were calculated using the methods m the Highway Noise Model 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 penods used m the calculation of CNEL. Weighting these equivalent noise levels and summing them gives the CNEL for the traffic projections. Future year 2035 traffic along State Street is predicted to be at most 6,700 average daily trips (ADT) The speed limit along State Street is 30 MPH Based on the extenor noise model, the worst-case cumulative noise level was found to be 64.5 dBA CNEL at the site. Based upon these findings, if balconies are required for pnvate outdoor usable space, the balconies would require bamers to reduce extenor noise to below the City of Carlsbad exterior noise level standards. "liTicifofe7~if~balconies are requiredThat race the roadway or Tair"aligrfrh^t7the~5a[o3hre"s^ should of solid construction measuring a mmimum of^ 3^/2 feet in height to reduce nois^ levels-at-the-private-uses ~The solid^raihng is anticipated to achieve a 5 d^abe! reduction, based on elevation offeets_andj:e.duce thfiLOoiseJeyejs at tiie balconies 9/12/2017 7 1709-04 Town House Noise Report Mark Benjamin ««» «'««>" "»«2685 state Street pitoo. 7to-4T3-l2S3 Carlsbad, CA 92008 Fax760-689-4943 Interior Noise Levels TTie methodology used to determine the resultant interior noise levels is based upon the extenor noise level minus the sound transmission loss as idenbfied in the Amencan Soaety of Testing and Matenals (ASTM) guidelines: E413 &E90. 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 Hertz - 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 each of the building components that will reduce the interior noise levels. Building components typically include the windows, extenor doors, and extenor walls. The total noise reduction is dependent upon the transmission loss of each building component, their subsequent surface area, quality of the building/construction matenals, a building fagade and angle correction The intenor noise level is also dependent on the acoustical energy absorbed within the room based upon the Noise Reduction Coefflaents (NRC) NRC is a scalar representation of the amount of sound energy absorbed upon stnking a particular surface and the anthmetic value average of sound absorption coefRaents indicating a matenal's ability to absorb sound The absorption coefficients for individual surface areas such as carpet, drywall and furnishings are used to calculate the intenor room effects. The calculated building noise reduction includes both the room absorption charactenstics and the transmission loss from the extenor wall assembly. The interior noise reduction calculations were performed using Ldn's interior noise model The model converts the extenor 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 AVRP Skyport Studios received September 2017 The following construction details were utilized for each of the building assemblies to determine the noise reduction charactenstics: Exterior walls and roof assemblies must have a Sound Transmission Qass (STC) rating of 46 or better. Extenor walls with this rating consist of 2"k4" studs or larger, spaced 16" o.c. with R-13 insulation minimum and an extenor surface of 7/8" cement plaster (stucco). Intenor wall and ceiling surfaces shall be at least 1/2" thick gypsum or plaster. Roof assemblies should have a minimum of W sheathing, R-30 insulation and sealed to prevent noise leaks. Glass assemblies should be dual-glazed and acoustical sealant applied around the exterior edges. The window assemblies are generally the weakest noise reducing component but are the most convenient 9/12/2017 8 1709-04 Town House Noise Report Mark Benjamin "-"^r CA 92X22685 State Street 760-473-1253 Carlsbad, CA 92008 Fax760-689-4943 and cost effective elements to change if additional attenuation is needed The STC ratings for the glass assemblies was calculated in the intenor noise model and provided in the findings below. Bathrooms, kitchens, closets and comdors are not required to meet the 45 dBA CNEL standard and therefore were not modeled. The sensitive rooms were considered to have ble or hardwood floonng to be conservative. These rooms were modeled to determine the intenor noise reductons. If the modeled intenor noise levels were found to be higher than 45 dBA CNEL in the habitual areas with the minimum assembly requirements descnbed above addibonal modeling was performed to determine the minimum STC rating for the glass assemblies to further reduce interior noise levels below the acceptable intenor threshold of 45 dBA CNEL. TRF'M§riorTioi^=tevels-were-determiriecM:9~be^5-dBA~CNEL Therefore^-if-balconies-ar^ TeqLnfe9~thatrfacerth"e road^v or rail aliqnmehtTyie'balconies'should be of^solidtOTisfruction Tfieasunno alhThrrhum of 3"V2 feet in heidh'tToTedUCe noise' levels aT th^privaT^jses^The solid railing is anticipated to achieve a 5 decibel r^'urtion based on elevation off^ts and reduce the noise levels at the balconies. Basic calculations show that a windows open condition will only reduce the intenor noise levels 12-15 dBA CNEL and not provide adequate intenor noise mitigation ^To-meet-the-45-dBA CNE|- mtE?15rTRoise-standard;::a]Ti52erall_rniDimurru intehor-noise-level- reductidn_of_206033EEjs? U]e^ed_for_t^ pFOposed-proj^ CLtieretore,,a~cId^d'Widow condition is_r^uiredJto jeduce intgnir;TOi^le^^o"cdmply_v^fircCFnitl^2T Carlsbad.requ|rements The windo^ ct^^condition-requires that meOjanical ventilation is install^-to move air-within~the~strQctcire andLcbhtfol tehTpeTatlFes—Therrrechahic^ must meet-the junsdictional cequirem_ents CfoCQiese dwelling units? '" ' The hourly building fagade noise level of 65 dBA CNEL was utilized for all proposed sensitive rooms to determine the minimum STC ratings of the assemblies It should be noted though, maximum sound levels due to rail operations could reach instantaneous peaks above 85 dBA due to signaling and warning devices. Although these peak noise levels may only occur for a few seconds, operation of such devices dunng nighttime hours could result in a nuisance to sensitive receptors The necessary Sound Transmission Class and transmission losses for all glass assemblies are provided in Table 2 To^eet-The^^lniBnJhi'Teqnirerrrentsr^ll-glass'assgfntilie^facirig'drhaving/ 9/12/2017 9 1709-04 Town House Noise Report Mark Benjamin Archipelago Development 2685 State Street Carisbad, CA 92008 42428 Chisolm Trail, Mumeta, CA 92562 phone 760-473-1253 Fax760-689-4943 a:d^^^ne_olgJtOO^^~rallroad'trat:ks2sh^ould"b^g~daal=paned and acoustical-sealant-applied §rounidJhe_exterLor._ed^jTaving_an_SrC-ISjiating.JJie- modeled results with an anticipated mferioErioise-level ot45-dBA CNELorJess^re prjDvidecLas3r\J\ttachment\.o this report. Table 2: Minimum Sound Transmission Class Ratings Octave Band Transmission Loss (Hz)SIC Rating^Assembly 1000 2000 4000 Windows Fixed Windows G ass Doors ' STC Ratings used m Mode! A]thouQhrSTC"2&^gd^hddw^d^jass^assemblies are needed to meet the_45. dBA CNEL^ ^ndard^^ue~to the rail operations, it is recommended that intenor noise reduction methods (i.e., dual-paned glass treatments) for the window and glass assemblies installed having line of sight to the rail alignment be increased to a minimum sound transmission classificaton (STC) rating of 31. This would assist in remediating instantaneous noise levels from the tram acbvibes. If you have any questions, please do not hesitate to contact me directly at (760) 473-1253. Sincerely, Ldn Consuiting, Inc Jeremy Louden, Principal Attachments:Intenor Noise Model Calculations 9/12/2017 10 1709-04 Town House Notse Report INTERIOR NOISE CALCULATIONS Project Name Town House Ldn Consulting, Inc Building (s)All Floor Level 1 Date 9/8/17 Arch Plan Ail Room Type Residential Lobby Project # 17-09 Exterior Noise Leveis dBA CNEL* Frequency (Hz.) 125 250 500 1000 2000 4000 [Extend Noise.Level (Traffic SpectrunH)51 0 55 7 58 5 60 8 57 7 52 0 Transmission Loss (TL) Exterior Assembly Source Area STC Transmission Loss (dB) Frequency (Hz.) 125 250 500 1000 2000 4000 Stucco NBS W-50-71 180 46 27 42 44 46 49 54 Windows Milgard 0 28 19 20 22 32 37 38 Fixed Window Milgard 120 28 21 15 25 35 41 28 Glass Doors Milgard 60 28 19 17 26 33 39 29 Extenor Door NBS Monograph 77 0 26 16 14 23 30 36 26 Room Absorption (RA) Interior Characteristics Source NRC Absorption Coefficients Frequency (Hz.) 125 250 500 1000 2000 4OO0 Carpet Army TM 5-805-4 0 28 0 15 0 17 0 12 0 32 0 52 0 30 Fumishings ArmyTM 5-805^0 45 0 32 0 29 0 42 0 58 0 60 048 Drywall Netwell 0 07 009 0 08 0 05 0 03 006 009 Overall Absorption Factor (Fumished Room)08 0 56 0 54 0 59 0 93 1 18 0 87 Noise Reduction Noise Reduction from Absorption based upon Floor Area Noise Level Increase for Defects and Exposed Surface Area 125 250 500 1000 2000 4000 -25 4 17 9 -25 4 17 9 -25 4 17 9 -25 4 17 9 -25 4 17 9 -25 4 17 9 Overall Reduction from Tranmission Loss + Room Absorption - Surface Exposure Building Fagade Noise Level (dBA CNEL) 20 9 65 0 Resultant Interior Noise Level (clBA CNEL)44 • Corrections for Fafade Level was accounted for in ttie modeling INTERIOR NOISE CALCULATIONS Project Name Building (s) Roor Level Arch Plan Room Type Town House All 1 All Lobby Ldn Consulbng, Inc Date 9/8/17 Project # 17-09 Exterior Noise Leveis Transmission Loss (TL) Frequency (Hz.) dBA CNEL*125 250 500 1000 2000 4000 S StoTOr>lbise"Level^( i-rBthffijpecDiirnJ*" T'tf - °;■ ■ 6F(3~|51 0 55 7 58 5 608 57 7 52 0 Transmission Loss (dB) Exterior frequency (Hz) Assembly Source Area STC 125 250 500 1000 2000 4000 Stucco NBS W-50-71 390 46 27 42 44 46 49 54 Windows Milgard 0 28 19 20 22 32 37 38 Fixed Window Milgard 56 28 21 15 25 35 41 28 Glass Doors Milgard 50 28 19 17 26 33 39 29 Extenor Door NBS Monograph 77 0 26 16 14 23 30 36 26 Room Absorption (RA) Absorption Coefficient Interior Frequency (Hz) Characteristics Source NRG 125 250 500 1000 2000 4000 Carpet ArmyTM 5-805^0 28 0 15 0 17 0 12 0 32 0 52 0 30 Furnishings ArmyTM 5-805-4 0 45 0 32 0 29 0 42 0 58 0 60 048 Drywall Netwell 0 07 0 09 008 0 05 0 03 006 009 Overall Absorpbon Factor (Furnished Room)08 0 56 0 54 0 59 0 93 1 18 0 87 Noise Reduction Noise Reducbon from Absorpbon based upon Roor Area Noise Level Increase for Defects and Exposed Surface Area 125 250 500 lOOO 2000 4000 -24 9 17 8 -24 9 17 8 -24 9 17 8 -24 9 17 8 -24 9 17 8 -24 9 17 8 Overall Reducbon from Tranmission Loss + Room Absorpbon - Surface Exposure Building Fagade Noise Level (dBA CNEL) 22 0 65 0 Resultant Interior Noise Level (clBA CNEL)43 ' Corrections for Facade Level was accounted for in the modeling INTERIOR NOISE CALCULATIONS Project Name Town House Ldn Consulting, Inc Building (s)All Roor Level 1 Date 9/8/17 Arch Plan All Room Type Conference Room Project # 17-09 Exterior Noise Leveis Extenor Noise Level (Traffic Spectrum) dBA CNEL* Frequency (Hz,) 125 250 500 1000 2000 4000 65 0 51 0 55 7 58 5 608 577 52 0 Transmission Loss (TL) Exterior Assembly Source Area STC Transmission Loss (dB) Frequency (Hz.) 125 250 500 1000 2000 4000 Stucco NBS W-50-71 280 46 27 42 44 46 49 54 Windows Milgard 151 28 19 20 22 32 37 38 Fixed Window Milgard 0 28 21 15 25 35 41 28 Glass Doors Milgard 0 28 19 17 26 33 39 29 Extenor Door NBS Monograph 77 0 26 16 14 23 30 36 26 Room Absorption (RA) Interior Characteristics Source NRC Absorption Coefficients Frequency (Hz) 125 250 500 1000 2000 4000 Carpet ArmyTM 5-805-^0 28 0 15 0 17 0 12 0 32 0 52 030 Furnishings Army TM 5-80S4 0 45 0 32 0 29 0 42 0 58 0 60 048 Drywall Netwell 0 07 009 008 0 05 0 03 006 009 loverall Absorption Factor (Furnished Room)08 0 56 0 54 0 59 0 93 1 18 0 87 Noise Reduction NcMse Reduction from Absorption based upon Floor Area NcHse Level Increase for Defects and Exposed Surf^ Area 125 250 500 1000 2000 4OO0 -24 0 16 7 -24 0 16 7 -24 0 16 7 -24 0 16 7 -24 0 16 7 -24 0 16 7 Overall Reduction from Tranmission Loss + Room Absorption - Surface Exposure Building Fagade Noise Level (dBA CNEL) 20 8 65 0 Resultant Interior Noise Level (dBA CNEL)44 ' Corrections for Fagade Level was accounted for in the modeling INTERIOR NOISE CALCULATIONS Project Name Building (s) Floor Level Art±i Plan Room Type Town House All 4 PHI Living Ldn Consulting, Inc Date 9/8/17 Project # 17-09 Exterior Noise Levels Extenor Noise Level (Traffic Spectrum) dBA CNEL* Frequency (Hsc.) 125 250 500 lOOO 2000 4OO0 65 0 51 0 55 7 58 5 608 577 52 0 Transmission Loss (TL) Exterior Assembly Source Area SIC Transmission Loss (dB) Frequency (Hz.) 125 250 500 1000 2000 4O00 Stucco NBS W-50-71 708 46 27 42 44 46 49 54 Windows Milgard 39 28 19 20 22 32 37 38 Fixed Window r^ilgard 74 28 21 15 25 35 41 28 Glass Dcxms Milgard 227 28 19 17 26 33 39 29 Extenor Dcxir NBS Monograph 77 0 26 16 14 23 30 36 26 Room Absorption (RA) Interior Characteristics Source NRC Absorption Coefficients Frequency (Hz.) 125 250 500 1000 20O0 4OO0 Carpet Army TM 5-805-4 0 28 0 15 0 17 012 0 32 0 52 030 Furnishings Army TM 5-805^0 45 0 32 0 29 0 42 0 58 0 60 048 Drywall Netwell 0 07 0 09 008 0 05 0 03 006 009 [overall Absorption Factor (Furnished Room)08 0 56 0 54 0 59 0 93 1 18 0 87 Noise Reduction Noise Reduction from Absorption based upon Roor Area Noise Level Increase for Defects and Expcjsed Surface Area 125 250 500 1000 2000 4000 -28 2 19 4 -28 2 19 4 -28 2 19 4 -28 2 19 4 -28 2 19 4 -28 2 19 4 Overall Reduction from Tranmission Loss + Room Absorption - Surface Exposure Building Fagade Noise Level (dBA CNEL) 20 5 65 0 Resultant Interior Noise Level (dBA CNEL)44 • Corrections for Fagade Level was accounted for in the modeling INTERIOR NOISE CALCULATIONS Project Name Building (s) Floor Level Arch Plan Room Type Town House All 4 PHI Master Bedroom Ldn Consulting, Inc Date 9/8/17 Project # 17-09 Exterior Noise Levels Extenor Noise Level (Traffic Spectrum) dBA CNEL* Frequency (Hz.) 125 250 500 1000 20O0 4O00 65 0 51 0 55 7 585 60 8 SJl 52 0 Transmission Loss (TL) Exterior Assembly Source Area STC Transmission Loss (dB) Frequency (Hz.) 125 250 500 1000 2000 4000 Stucco NBS W-50-71 360 46 27 42 44 46 49 54 Windows Milgard 25 28 19 20 22 32 37 38 Fixed Window Milgard 10 28 21 15 25 35 41 28 Glass Doors Milgard 24 28 19 17 26 33 39 29 Extenor Door NBS Monograph 77 0 26 16 14 23 30 36 26 Room Absorption (RA) Interior Characteristics Source NRC Absorption Confidents Frequertcy (Hz.) 125 250 500 1000 2000 4OO0 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 60 048 Drywall Netwell 0 07 009 0 08 0 05 0 03 006 009 jOverall Absorption Factor (Furnished Room)08 0 56 0 54 0 59 0 93 1 18 0 87 Noise Reduction Noise Reduchon from Absorpbon based upon Roor Area Noise Level Increase for Defects and Exposed Surface Area 125 250 500 1000 2000 4O00 -23 2 18 0 -23 2 18 0 -23 2 18 0 -23 2 18 0 -23 2 18 0 -23 2 18 0 Overall Reduchon from Tranmission Loss + Room Absorpbon - Surface Exposure Building Fagade Noise Level (dBA CNEL) 25 4 65 0 Resultant Interior Noise Level (dBA CNEL)40 * Corrections for Facade Level was accounted for In the modeling INTERIOR NOISE CALCULATIONS Project Name Building (s) Floor Level Arcfi Plan Room Type Town House All 4 PH2 Lmng Ldn Consulting, Inc Date 9/8/17 Project # 17-09 Exterior Noise Leveis Exterior Noise Level (Traffic Spectrum) dBA CNEL* Frequency (Hz.) 125 250 500 1000 2000 4OO0 65 0 51 0 55 7 585 60 8 57 7 52 0 Transmission Loss (TL) Exterior Assembly Source Area STC Transmission Loss (dB) Frequency (Hz.) 125 250 500 1000 2000 4000 Stucco NBS W-50-71 996 46 27 42 44 46 49 54 Windows Milgard 140 28 19 20 22 32 37 38 Fixed Window Milgard 154 28 21 15 25 35 41 28 Glass Doors Milgard 375 28 19 17 26 33 39 29 Extenor Door NBS Monograph 77 0 26 16 14 23 30 36 26 Room Absorption (RA) Interior Characteristics Source NRC Absorption Coefficients Frequency (Hz.) 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 5-805-1 0 45 0 32 0 29 0 42 0 58 060 0 48 Drywall Netwell 0 07 009 008 0 05 0 03 0 06 0 09 loverall Absorpton Factor (Furnished Room)08 0 56 0 54 0 59 0 93 118 0 87 Noise Reduction Noise Reduction from Absorpton based upon Roor Area Noise Level Increase for Defects and Exposed Surface Area 125 250 500 1000 2000 4O00 -28 7 20 0 -28 7 20 0 -28 7 20 0 -28 7 20 0 -28 7 20 0 -28 7 20 0 Overall Reduction from Tranmission Loss + Room Absorpton - Surface Exposure Building Fagade Noise Level (dBA CNEL) 21 1 65 0 Resultant Interior Noise Level (dBA CNEL)44 * Corrections for Fatade Level was accounted for in the modeling INTERIOR NOISE CALCULATIONS Project Name Building (s) Roor Level Arch Plan Room Type Town House All 4 PH2 Bedroom Ldn Consulting, Inc Date 9/8/17 Project # 17-09 Exterior Noise Leveis Frequertcy (Hz.) \ dBA CNEL*125 250 500 1000 2000 4000 lExtenor Noise Level (Traffic Spectrum)65 0 51 0 55 7 58 5 60 8 577 52 0 Transmission Loss (TL) Transmission Loss (dB) Exterior Frequency (Hz.) Assembly Source Area STC 125 250 500 1000 2000 4O00 Stucco NBS W-50-71 168 46 27 42 44 46 49 54 Windows Milgard 30 28 19 20 22 32 37 38 Fixed Window Milgard 0 28 21 15 25 35 41 28 Glass Doors Milgard 0 28 19 17 26 33 39 29 Extenor Door NBS Monograph 77 0 26 16 14 23 30 36 26 Room Absorption (RA) Interior Characteristics Source NRG Absorption Coeffidents Frequertcy (Hz.) 125 250 500 lOOO 2000 4O00 Carpet Furnishings Drywall Army TM 5-805-4 ArmyTM 5-805-4 Netwell 0 28 0 45 0 07 0 15 0 32 0 09 0 17 0 29 0 08 0 12 0 42 0 05 0 32 0 58 0 03 0 52 0 60 0 06 030 048 009 Overall Absorpton Factor (Furnished Room) Noise Reduction 08 0 56 054 0 59 0 93 1 18 0 87 Noise Reduction from Absorption based upon Roor Ai^ea Noise Level Increase for Defects and Exposed Surface Area 125 250 500 1000 2000 4000 -22 0 15 7 -22 0 15 7 -22 0 15 7 -22 0 15 7 -22 0 15 7 -22 0 15 7 Overall Reducbon from Tranmission Loss + Room Absorpbon - Surface Exposure Building Fagade Noise Level (dBA CNEL) 25 2 65 0 Resultant Interior Noise Level (dBA CNEL)40 * Corrections for Fagade Level was accounted for In the modeling