Loading...
HomeMy WebLinkAboutCT 2019-0006; 2690 ROOSEVELT; INTERIOR NOISE ANALYSIS; 2020-01-22·1';:.::.:J;.~;.l,, ~. I ~ ~~k"r~::.. . •ti ·:J! ~,· I ' INTERIOR NOISE ANALYSIS 2690 ROOSEVELT CARLSBAD, CA January 22, 2020 DRAFT Prepared for: Roosevelt Carlsbad, L.P. 1555 Camino Del Mar, Suite 307 Del Mar, CA 92014 Prepared by: dBF Associates, Inc. dBF Associates, Inc. 3129 Tiger Run Court, Suite 202 Carlsbad, CA 920 I 0 619-609-0712 © dBF Associates, Inc. 2020 ~City of c~frfsbacf MAR O 2. 2020 Planning Division .... ",:, :~ ,J.-. • 1.0 Introduction and Summary ............................................................................................. 1 1.1 Mitigation ............................................................................................................................ 1 1.2 Noise Background ............................................................................................................... 3 2.0 Applicable Noise Standards ........................................................................................... 6 2.1 City of Carlsbad ................................................................................................................... 6 2.2 State of California ............................................................................................................... 6 3.0 Existing Noise Environment ..................................................................... .' ..................... 7 3.1 Roadway Traffic .................................................................................................................. 7 3.2 Sound Level Measurements ................................................................................................ 7 4.0 Future Noise Environment ............................................................................................ 10 5.0 Noise Reduction Calculations ...................................................................................... 12 6.0 Findings and Mitigation ................................................................................................ 13 7.0 References ..................................................................................................................... 15 8.0 List of Preparers ............................................................................................................ 16 Tables Table 1. Sound Levels of Typical Noise Sources and Noise Environments ................................................ .4 Table 2. Sound Level Measurement (dBA) ................................................................................................... 8 Table 3. Acoustical Treatments ................................................................................................................... 13 Table 4. Sound Transmission Loss Values (dB) at Octave Band Center Frequency (Hz) .......................... 14 Figures Figure 1. Vicinity Map .................................................................................................................................. 2 Figure 2. Sound Level Measurement Location ............................................................................................. 9 Figure 3. Future Exterior Noise Levels (CNEL) ......................................................................................... 11 Appendices Appendix A. Roadway Noise Calculations Appendix B. Interior Noise Estimate Procedure Appendix C. Interior Noise Calculations dBF Associotes. Inc. 1.0 INTRODUCTION AND SUMMARY This report estimates the interior noise environment within residential habitable rooms of the proposed 2690 Roosevelt project. The project site is located along the northeast side of Roosevelt Street, between Laguna Drive and Beech A venue, in the City of Carlsbad, CA (Figure I). The project would entail the construction of ten dwelling units in three three-story buildings. The primary noise source in the project vicinity is vehicular traffic on local roadways. Future exterior roadway noise levels at the proposed buildings would range from below 60 dBA CNEL at the east-facing facades to approximately 65 dBA CNEL at the west-facing fa9ades. Acoustical calculations estimate that noise levels within residential units would be 45 dBA CNEL or below, and would comply with the City of Carlsbad General Plan and CBC Section 1207.4 interior noise level requirements, with the windows closed and with implementation of the noise control measures discussed below. 1.1 MITIGATION • Exterior window and door assemblies would be required to meet minimum sound transmission class (STC) ratings as detailed in Table 3 and Table 4 of this report. • Pursuant to California Building Code (CBC) requirements, mechanical ventilation would be required to provide for a closed-window/door condition in habitable rooms. The following details the methodology and findings of the analysis. dBF A%ociotes, !nc. 1 ► 2690 Roosevelt Street Noise Analysis Pacific Ocean dBF " V-,019'. FIGURE 1 Vicinity Map ... "' ,}-.. • - 1.2 NOISE BACKGROUND Noise is generally defined as loud, unpleasant, unexpected, or undesired sound that is typically associated with human activity and that interferes with or disrupts normal activities. The human environment is characterized by a certain consistent noise level that varies by location and is termed ambient noise. Although exposure to high noise levels has been demonstrated to cause hearing loss, the principal human response to environmental noise is annoyance. The response of individuals to similar noise events is diverse and influenced by the type of noise, perceived importance of the noise and its appropriateness in the setting, time of day and type of activity during which the noise occurs, and sensitivity of the individual. Sound is a physical phenomenon consisting of minute vibrations that travel through a medium, such as air, and are sensed by the human ear. Sound is generally characterized by several variables, including frequency and intensity. Frequency describes the sound's pitch and is measured in cycles per second, or hertz (Hz), whereas intensity describes the sound's loudness and is measured in decibels ( dB). Decibels are measured using a logarithmic scale. A sound level of 0 dB is approximately the threshold of human hearing and is barely audible under extremely quiet listening conditions. Normal speech has a sound level of approximately 60 dB. Sound levels above about 120 dB begin to be felt inside the human ear as discomfort and eventually as pain at still higher levels. The minimum change in the sound level of individual events that an average human ear can detect is about 3 dB. The average person perceives a change in sound level of about 10 dB as a doubling (or halving) of the sound's loudness; this relation holds true for sounds of any loudness. Sound levels of typical noise sources and environments are provided in Table 1. Because of the logarithmic nature of the decibel unit, sound levels cannot be added or subtracted directly and are somewhat cumbersome to handle mathematically. A simple rule is useful, however, in dealing with sound levels. If a sound's intensity is doubled, the sound level increases by 3 dB, regardless of the initial sound level. Thus, for example, 60 dB + 60 dB = 63 dB, and 80 dB + 80 dB = 83 dB. The normal human ear can detect sounds that range in frequency from about 20 Hz to 20,000 Hz. However, all sounds in this wide range of frequencies are not heard equally well by the human ear, which is most sensitive to frequencies in the range of 1,000 Hz to 4,000 Hz. This frequency dependence can be taken into account by applying a correction to each frequency range to approximate the human ear's sensitivity within each range. This is called A-weighting and is commonly used in measurements of community environmental noise. The A-weighted sound pressure level (abbreviated as dBA) is the sound level with the "A-weighting" frequency correction. In practice, the level of a noise source is conveniently measured using a sound level meter that includes a filter corresponding to the dBA curve. dBF Associates. Inc 3 I· .. Table 1. Sound Levels of Typical Noise Sources and Noise Environments Human Judgment Noise Source Noise Environment A-Weighted of Noise Loudness (at Given Distance) Sound Level (Relative to Reference Loudness of 70 Decibels*) Military Jet Takeoff Carrier Flight Deck 140 Decibels 128 times as loud with Afterburner (50 ft) Civil Defense Siren (100 ft) 130 64 times as loud Commercial Jet Take-off (200 ft) 120 32 times as loud Threshold of Pain Pile Driver (50 ft) Rock Music Concert 110 16 times as loud Inside Subway Station (New York) Ambulance Siren (100 ft) 8 times as loud Newspaper Press (5 ft) 100 Very Loud Gas Lawn Mower (3 ft) Food Blender (3 ft) Boiler Room Propeller Plane Flyover (1,000 ft) Printing Press Plant 90 4 times as loud Diesel Truck (150 ft) Garbage Disposal (3 ft) Noisy Urban Daytime 80 2 times as loud Passenger Car, 65 mph (25 ft) Reference Loudness Living Room Stereo (15 ft) Commercial Areas 70 Moderately Loud Vacuum Cleaner (10 ft) Normal Speech (5 ft) Data Processing Center 60 1/2 as loud Air Conditioning Unit (100 ft) Department Store Light Traffic (100 ft) Large Business Office 50 1/4 as loud Quiet Urban Daytime Bird Calls (distant) Quiet Urban Nighttime 40 1/8 as loud Quiet Soft Whisper (5 ft) Library and Bedroom at Night 30 1/16 as loud Quiet Rural Nighttime Broadcast and Recording Studio 20 1/32 as loud Just Audible 0 1/64 as loud Threshold of Hearing Source: Compiled by dBF Associates, Inc. dBF Associates, lnc. 4 .. -,. t The Community Noise Equivalent Level (CNEL) is an adjusted average A-weighted sound level for a 24-hour day. It is calculated by adding a 5-dB adjustment to sound levels during evening ' hours (7:00 p.m. to 10:00 p.m.) and a 10-dB adjustment to sound levels during nighttime hours (10:00 p.m. to 7:00 a.m.). These adjustments compensate for the increased sensitivity to noise during the typically quieter evening and nighttime hours. CNEL is used by the State of California and City of Los Angeles to evaluate land-use compatibility with regard to noise. Sound Transmission Class (STC) is a single-number rating of the effectiveness of a material or construction assembly to impede the transmission of airborne sound . dBF Associates. Inc. 5 .. r 2.0 APPLICABLE NOISE STANDARDS 2.1 CITY OF CARLSBAD 2.1.1 General Plan The City of Carlsbad General Plan Section 5: Noise provides noise standards. Within interior spaces of residential land uses, the allowable noise exposure is 45 dBA CNEL [City of Carlsbad 2015]. 2.2 STATE OF CALIFORNIA California Building Code (CBC), Chapter 12: Interior Environment, Section 1207: Sound Transmission regulates noise levels in buildings with multiple habitable units [State of California 2015]. Relevant portions are reproduced below. 1207.4 Allowable interior noise levels. Interior noise levels attributable to exterior sources shall not exceed 45 dB in any habitable room. The noise metric shall be either the day-night average sound level (Ldn) or the community noise equivalent level (CNEL), consistent with the noise element of the local general plan. dBF Associates, Inc. 6 -1-1 3.0 EXISTING NOISE ENVIRONMENT The project site is located along the northeast side of Roosevelt Street, between Laguna Drive and Beech A venue. The project site is currently developed with a residence and a small temporary structure. The surrounding properties are developed with residential uses. The primary noise source currently affecting the project site is vehicular traffic on Roosevelt Street. 3.1 ROADWAY TRAFFIC Roosevelt Street is a two-way undivided roadway with one northwest-bound lane and one southeast-bound lane, with parallel on-street parking along both sides. Roosevelt Street is adjacent to the project site on the southwest, with a posted speed limit of 25 miles per hour (mph). Roosevelt Street has an existing (year 2013) average daily traffic (ADT) volume of 6,500 vehicles between Laguna Drive and Grand Avenue [SANDAG 2019a]. Roosevelt Street has an approximately flat grade. 3.2 SOUND LEVEL MEASUREMENTS One short-term (IO-minute) sound level measurement was conducted on Monday, July 1 to quantify the existing onsite acoustical environment. The measurement was conducted approximately 230 feet northwest of the project site to minimize contamination from construction of the Beachwalk at Roosevelt development occurring across the street from the project site. A RION Model NL-31 American National Standards Institute (ANSI) Type 2 Integrating Sound Level Meter was used as the data-collection device. The meter was mounted to a tripod roughly five feet above ground to simulate the average height of the human ear. The sound level meter was calibrated before and after the measurement period. The measurement results are summarized in Table 2 and correspond to the location depicted on Figure 2. A review of the table shows that the measured sound level was approximately 60 dBA Leq along Roosevelt Street. The primary noise source during the measurement was roadway traffic on Roosevelt Street. Construction noise -saws, yelling, backup beepers, forklift, hammering, & pneumatic equipment -was periodically audible. One distant aircraft was audible. One occurrence of a train horn & crossing bells was audible. The construction noise, aircraft, and train did not meaningfully contribute to the noise level. dBF Associates, Inc, 7 Table 2. Sound Level Measurement (dBA) Measurement Location Date/Time Leq Lmin Lmax L10 L50 L90 Traffic ML 1: Roosevelt Street, 07/01/2019 59.7 42.9 69.7 64.4 55.6 48.6 NWB: 17 cars ~42' northeast of centerline 10:05-10:15 a.m. SEB: 18 cars ., dBF Associates, Inc. 8 FIGURE 2 Sound Level Measurement Location ,. 4.0 FUTURE NOISE ENVIRONMENT The future noise environment would primarily be a result ofvehicular traffic on Roosevelt Street. The Federal Highway Administration (FHWA) Traffic Noise Model (TNM) version 2.5 was used to calculate traffic noise levels. The modeling effort included the roadway alignments, estimated average vehicle speeds, peak-hour traffic volume, estimated vehicle mix, project grading, and locations of existing buildings and the project building. The peak-hour traffic volume was assumed to be 10% of the ADT. Agencies such as the U.S. Department of Housing and Urban Development (HUD) consider the peak-hour Leq to be reasonably equivalent to the CNEL for vehicular traffic. The model was calibrated using actual traffic counts and sound level measurements; modeled sound levels were within 2 dB A of measured sound levels. Future vehicular traffic calculations are summarized in Appendix A. A default ground type of "pavement" was used in the model. The future (year 2050) ADT volume on Roosevelt Street between Laguna Drive and Grand Avenue is projected to be approximately 7,000 vehicles [SANDAG 20196]. The speed limit on Roosevelt Street is expected to remain at 25 mph in the future. The traffic mix observed during the project site visit was 100% cars. However, the City of Carlsbad Noise Guidelines Manual [City of Carlsbad 1995] indicates that a traffic mix of 97.89% automobiles, 1.83% medium trucks, and 0.28% heavy trucks should be used for non-truck routes. Future exterior roadway noise levels at the proposed project buildings would range from below 60 dBA CNEL at the east-facing fa9ades to approximately 65 dBA CNEL at the west-facing fa9ades, as shown on Figure 3. Rail operations are not expected to meaningfully contribute to the noise environment at the project site. dBF Associates. Inc. 2690 Roosevelt Street Noise Analysis -Q) e ci5 -1 rJ) 8 0:: FIGURE 3 Future Exterior Noise Levels (dBA CNEL) 5.0 NOISE REDUCTION CALCULATIONS Acoustical calculations were performed to estimate the interior noise levels within habitable rooms where the future exterior noise level at the building fa9ade is expected to exceed 60 dBA CNEL. The interior noise level depends on the exterior noise level, the sound-absorption characteristics of the room, the surface area of each building element (wall, window, door, etc.), and the exterior-to-interior sound transmission loss qualities of each construction material. Information about the surface areas and materials were obtained from the architectural drawings [Starck Architecture+ Planning 2020]. The exterior noise levels, calculated in dBA CNEL, are converted to six octave-band sound pressure levels consistent with standard traffic noise characteristics. The exterior noise levels were calculated for free-field conditions with no building fa9ade reflections; therefore, a +3 dBA building fa9ade reflection correction was added to the calculated exterior noise levels used in the interior analysis. The interior noise level predictions have been made in accordance with generally accepted acoustical methods and assume good construction techniques. However, construction practices may degrade the calculated acoustical performance of walls and/or window assemblies; therefore, another + 3 dBA quality correction was added to the calculated exterior noise levels used in the interior analysis. All exterior ducts and vents were assumed to be acoustically treated. The interior noise calculations were conducted using the formula shown in Appendix A. Table 3 shows the necessary STC rating of each building element in each unit. The octave-band sound transmission loss values of the building elements used in the analysis are shown in Table 4. The results of the interior calculations shown are in Appendix B. dBF A~sociates. Inc. 12 .... 6.0 FINDINGS AND MITIGATION Acoustical calculations show that the estimated interior noise levels in habitable rooms would exceed 45 dBA CNEL with the windows open (Appendix B). Mechanical ventilation would be required for all habitable rooms to provide for a closed window condition pursuant to CBC requirements. Acoustical calculations estimate that installation of the acoustical treatments listed in Table 3, with the octave-band transmission losses listed in Table 4, would result in an interior noise environment of 45 dBA CNEL or below in habitable rooms. Table 3. Acoustical Treatments Unit & Room (where applicable) Required Acoustical Treatments Unit C1-1: Living Room I Entry/ Kitchen Window assemblies must meet or exceed a minimum STC of 30, and exterior glass door assemblies must meet or exceed a minimum STC of 31. All other units Window assemblies must meet or exceed a minimum STC of 27, and exterior glass door assemblies must meet or exceed a minimum STC of 26 . dBF Associates, Inc. 13 Table 4. Sound Transmission Loss Values (dB) at Octave Band Center Frequency (Hz) Building Element 125 250 500 1000 2000 4000 Exterior Wall: ¼" stucco, ¾" Type X gypsum board, 2x6 studs with cavity insulation, 39 44 47 46 53 61 2 layers of¾" Type X gypsum board NBS W-50-71 STC =49 Window, ½2" -1/15" -½2" Premier Series 550 21 22 23 27 31 31 #85-174 STC = 27 Window, ¼" -½" -¼" Philips Series 830 Vinyl Sliding 20 19 27 35 34 30 WEAL TL95-252 STC = 30 French Wood Door NBS W-94-71 21 24 26 27 24 28 STC = 26 Glass Outswing Door, ¼" -¾" -¼" VPI Quality Windows Vinyl 21 19 29 39 43 39 WEAL TL 12-509 STC = 31 dBF Associates, Inc. 14 7.0 REFERENCES American Society for Testing and Materials. 1990. Annual Book of ASTM Standards: Volume 04.06, Thermal Insulation; Environmental Acoustics. City of Carlsbad. 1995. Noise Guidelines Manual. September. 2015. General Plan. September. Harris, Cyril M. 1998. Handbook of Acoustical Measurements and Noise Control, Third Edition. Acoustical Society of America. Woodbury, NY. San Diego Association of Governments (SANDAG). 2019a. Average Traffic Volumes-City of Carlsbad. 2019b. Traffic Forecast Information Center, Forecast Series 12, Forecast Year 2050. • Starck Architecture+ Planning. 2020. 2690 Roosevelt. January 14. State of California. 2015. 2013 Title 24, Part 2, Vol. 1, California Building Code. Supplement. -. July 1. dBF Associates. Inc. 15 8.0 LIST OF PREPARERS Steven Fiedl. r, Principal dBF Associates, inc. 16 APPENDICES .. .. APPENDIX A ROADWAY NOISE CALCULATIONS INPUT: ROADWAYS dBF Associates, Inc. SPF INPUT: ROADWAYS PROJECT/CONTRACT: RUN: ,Roadway IName I iSEB ! I NWB .. , 2690 Roosevelt Measured i Points !Width Name I I 1ft I 12.0i point1 I I point2 I I 12.0j point3 I I point4 No. 1 2 3 4 21 July 2019 TNM2.5 Coordinates (pavement) I X y Iz i ft ft 1ft -500.0 -6.01 500.0 -6.0j 500.0 6.0j -500.0 6.01 C:\Dropbox (dBF Associates)\dBFA Team\_TNM\2690 Roosevelt\Measured 2690 Roosevelt Average pavement type shall be used unless a State highway agency substantiates the use of a different type with the approval of FHWA Flow Control Segment Control Speed Percent Pvmt On Device Constraint Vehicles Type Struct? Affected mph % 0.00 I Average 0.00 I 0.00 Average 0.00 • INPUT: TRAFFIC FOR LAeq1h Volumes 2690 Roosevelt I dBF Associates, Inc. 21 July 2019 SPF TNM 2.5 INPUT: TRAFFIC FOR LAeq1 h Volumes PROJECT/CONTRACT: 2690 Roosevelt RUN: Measured 1Roadway i Points Name j Name No. Segment Autos MTrucks HTrucks iBuses Motorcycles I V Is V s V s IV s V s veh/hr 1mph veh/hr mph veh/hr mph Jveh/hr mph veh/hr mph SEB I I point1 1 1081 35j 0 0 0 O! 0 01 0 0 I II point2 2 I ! I NWB Ii point3 3 102: 35 0 0 0 QI I 0 of 0 0 l II point4 4 I I I .. C:\Dropbox (dBF Associates)\dBFA Team\_TNM\2690 Roosevelt\Measured • INPUT: RECEIVERS 2690 Roosevelt I dBF Associates, Inc. 21 July 2019 SPF TNM2.5 INPUT: RECEIVERS PROJECT/CONTRACT: 2690 Roosevelt RUN: Measured Receiver I Name No. 0#DUs Coordinates (ground) Height Input Sound Levels and Criteria Active X y z above Existing Impact Criteria NR in Ground LAeq1h LAeq1h ISub'I Goal Cale. ft ft ft ft dBA dBA ldB ldB Receiver1 11 1 0.0 42.0 O.OOi 4.92 59.70 66! 10.0 8.0 y C:\Dropbox (dBF Associates)\dBFATeam\_TNM\2690 Roosevelt\Measured • RESULTS: SOUND LEVELS 2690 Roosevelt I dBF Associates, Inc. 21 July 2019 SPF TNM2.5 ' Calculated with TNM 2.5 I I RESULTS: SOUND LEVELS PROJECT/CONTRACT: 2690 Roosevelt RUN: Measured BARRIER DESIGN: INPUT HEIGHTS Average pavement type shall be used unless a State highway agency substantiates the use ATMOSPHERICS: 68 deg F, 50% RH of a different type with approval of FHWA. Receiver Name No. #DUs I Existing No Barrier With Barrier ILAeq1h iLAeq1h I Increase over existing Type Calculated I Noise Reduction I I j Calculated Crlt'n I Calculated Crlt'n Impact LAeq1h I Calculated Goal I C~lculated I i I Sub'I Inc ,mmus I I I ! !Goal I I ldBA dBA dBA ldB !dB dBA ldB dB !dB 4 Receiver1 1 1 59.71 57.8 661 -1.9 10 ---57.81 0.0 81 -8.0 iDwelllng Units i # DUs I Noise Reduction I I I Min j Avg I::x I I I dB I ! 1dB tAII Selected I 1 0.0 0.0 0.01 All Impacted 0 0.0 0.0 0.01 All that meet NR Goal I 0 0.0 0.0 0.01 I C:\Dropbox (dBF Assoclates)\dBFA Team\_ TNM\2690 Roosevelt\Measured INPUT: TRAFFIC FOR LAeq1h Volumes dBF Associates, Inc. SPF INPUT: TRAFFIC FOR LAeq1 h Volumes I PROJECT/CONTRACT: IRUN: Roadway Name SEB f NWB - 2690 Roosevelt Future I Points Name No. I ' ii point1 I! point2 11 point3 point4 1 2 3 4 21 July 2019 TNM2.5 Segment Autos IMTrucks V Js IV veh/hr !mph :veh/hr 342! 35' 7 I ' I i 342[ 351 7 I I C:\DROPBOX (DBF ASSOCIATES)\DBFA TEAM\_TNM\2690 ROOSEVELT\Future 2690 Roosevelt HTrucks Buses I Motorcycles s V s V 1s IV s mph veh/hr mph veh/hr !mph jveh/hr mph 35 1 351 oj 01 0 0 I I I I 35 1 35j Di 01 0 0 I I I I INPUT: RECEIVERS ldBF Associates, Inc. 'SPF INPUT: RECEIVERS PROJECT/CONTRACT: RUN: Receiver Name i Receiver1 2690 Roosevelt Future No. #DUs Coordinates (ground) X y ft ft 1 1 0.0 55.0 C:\DROPBOX (DBF ASSOCIATES)\DBFA TEAM\_TNM\2690 ROOSEVELl\Future z ft 21 July 2019 TNM25 2690 Roosevelt !Height Input Sound Levels and Criteria !above Existing Impact Criteria NR !Ground I LAeq1h LAeq1h ISub'I Goal [ft dBA dBA [dB /dB 0.00[ 4.92 0.00 66[ 10.0i Active in Cale. I I I 8.0 y • RESULTS: SOUND LEVELS 2690 Roosevelt I dBF Associates, Inc. 21 July 2019 SPF TNM2.5 Calculated with TNM 2.5 ! I RESULTS: SOUND LEVELS PROJECT/CONTRACT: 2690 Roosevelt RUN: Future BARRIER DESIGN: INPUT HEIGHTS Average pavement type shall be used unless a State highway agency substantiates the use ATMOSPHERICS: 68 deg F, 50% RH of a different type with approval of FHWA. Receiver Name No. #DUs !Existing jNo Barrier I With Barrier ILAeq1h [LAeq1h Increase over existing Type \Calculated Noise Reduction I ! /Calculated Crlt'n Calculated ICrlt'n Impact ILAeq1h Calculated Goal I Calculated I I I jsub'I Inc lmlnus i ' i I I i !Goal i I I idBA ldBA dBA dB !dB ldBA dB dB jdB ~Receiver1 1 11 O.Oj 62.4 66 62.41 10 --I 62.4 0.0 Bl -8.0 i Dwelling Units # DUs I Noise Reduction I j Min I Avg Max I I !dB I dB dB iAll Selected I 1i 0.01 0.0 0.0 I All Impacted 01 0.01 0.0 0.0 All that meet NR Goal 01 0.0[ 0.0 0.0 C:\DROPBOX (DBF ASSOCIATES)\DBFA TEAM\_TNM\2690 ROOSEVELT\Future • ., . APPENDIX B INTERIOR NOISE ESTIMATE PROCEDURE • . Interior Noise Estimate Procedure The interior noise level due to exterior noise sources is estimated for each building element at six octave bands from 125 Hz to 4,000 Hz using the equation below. The total interior A-weighted noise level is then estimated by the logarithmical summation of the A-weighted interior noise levels attributable to each building element. This process is in accordance with American Society of Testing and Materials (ASTM) standard E966-04. LINT = average ( equivalent) interior A-weighted sound pressure level ( dB), LEXT = average (equivalent) exterior A-weighted sound pressure level (dB), TL = transmission loss of the building element (dB), s = size of the building element (ft2), A = total room absorption (Sabins), CA "Incident Angle Correction" ( dB), CF = "Building Facade Reflection Correction" (dB), and CQ = "Quality Correction" ( dB). APPENDIX B INTERIOR NOISE ESTIMATE PROCEDURE B-1 APPENDIX C INTERIOR NOISE CALCULATIONS .. • • . c' INTERIOR NOISE ANALYSIS Project Name: 2690 Roosevelt Noise Source: Traffic Noise (NBS 1978) Building Fa,;:ade Reflection Correction: ~ dBA Quality Correction: ~ dBA Octave Band Center Frequency: 125 Reference Exterior A-Weighted Sound Level Spectrum: 86.0 Average Room Sound Absorption: 321 Interior A-Weighted Sound Level Spectrum: 35 Exterior A-Weighted Sound Level Building Element 65 Wall. STC 46, Stucco 65 Window, STC 27, 3/32"-5/16"-3/32" + 65 Window, STC 27, 3/32"-5/16"-3/32" + 65 French Wood Door, STC 26, 3/32" 62 Wall. STC 46, Stucco 62 Window, STC 27, 3/32"-5/16"-3/32" + 62 Window, STC 27, 3/32"-5/16"-3/32" + 62 Window, STC 27, 3/32"-5/16"-3/32" + 62 Wall, STC 46, Stucco Room Name: A2-1 Living/ Entry/ Kitchen Total Interior A-Weighted Sound Level: 42 dBA CNEL (closed windows) 60 dBA CNEL o en windows 250 500 1000 2000 4000 Hertz 90.7 93.5 95.8 92.7 87.0 dB (re: total of 100) 321 321 321 321 321 Sabins 35 36 35 31 23 (closed windows condition) Interior A-Weighted Incident Sound Level Angle Area Closed Open (%) Correction 252 31 31 16. 32 51 50 36 36 56 50 24 34 54 50 162 26 26 ~ 30 50 50 30 33 52 50 ~ 30 50 50 144 26 26 1/22/20 ,' • • a INTERIOR NOISE ANALYSIS Project Name: 2690 Roosevelt Noise Source: Traffic Noise /NBS 1978) Building Fac;:ade Reflection Correction: ;! dBA Quality Correction: ;! dBA Octave Band Center Frequency: 125 Reference Exterior A-Weighted Sound Level Spectrum: 86.0 Average Room Sound Absorption: 162 Interior A-Weighted Sound Level Spectrum: 29 Exterior A-Weighted Sound Level Building Element 62 Wall. STC 46. Stucco 62 Sliding Glass Door, STC 26, 3/16" Room Name: A2-1 Master Bedroom Total Interior A-Weighted Sound Level: 38 dBA CNEL (closed windows) 58 dBA CNEL o en windows 250 500 1000 2000 4000 Hertz 90.7 93.5 95.8 92.7 87.0 dB (re: total of 100) 162 162 162 162 162 Sabins 32 31 32 32 26 (closed windows condition) Interior A-Weighted Incident Sound Level Angle Area Closed Open (%) Correction 108 27 27 64 38 58 50 1/22/20 " • .. • INTERIOR NOISE ANALYSIS Project Name: 2690 Roosevelt Room Name: A2-1 Bedroom Noise Source: Traffic Noise (NBS 1978) Building Fac;ade Reflection Correction: ~ dBA Total Interior A-Weighted Sound Level: 38 dBA CNEL (closed windows) 56 dBA CNEL o en windows Quality Correction: ~ dBA Octave Band Center Frequency: 125 Reference Exterior A-Weighted Sound Level Spectrum: 86.0 Average Room Sound Absorption: 109 Interior A-Weighted Sound Level Spectrum: 31 Exterior A-Weighted Sound Level Building Element Wall. STC 46. Stucco Window. STC 27. 3/32"-5/16"-3/32" + 250 500 90.7 93.5 109 109 31 33 Area 99 30 1000 2000 4000 Hertz 95.8 92.7 87.0 dB (re: total of 100) 109 109 109 Sabins 31 24 18 (closed windows condition) Interior A-Weighted Incident Sound Level Angle Closed Open (%) Correction 29 29 37 56 50 1/22/20 • • • • INTERIOR NOISE ANALYSIS Project Name: 2690 Roosevelt Noise Source: Traffic Noise (NBS 1978) Building Fa<;ade Reflection Correction: J. dBA Quality Correction: J. dBA Octave Band Center Frequency: 125 Reference Exterior A-Weighted Sound Level Spectrum: 86.0 Average Room Sound Absorption: 246 Interior A-Weighted Sound Level Spectrum: 37 Exterior A-Weighted Sound Level Building Element 65 Wall. STC 46. Stucco 65 Window. STC 30. 1/8"-1/2"-1/8" + 65 Sliding Glass Door. STC 31. 3/16"-5/8"-3/16" 65 Window. STC 30. 1/8"-1/2"-1/8" + 62 Wall. STC 46. Stucco 62 Window. STC 30. 1/8"-1/2"-1/8" + 62 Window, STC 30. 1/8"-1/2"-1/8" + 62 Window. STC 30. 1/8"-1/2"-1/8" + 62 Wall. STC 46. Stucco Room Name: C1-1 Living/ Entry/ Kitchen Total Interior A-Weighted Sound Level: 43 dBA CNEL (closed windows) 62 dBA CNEL o en windows 250 500 1000 2000 4000 Hertz 90.7 93.5 95.8 92.7 87.0 dB (re: total of 100) 246 246 246 246 246 Sabins 40 35 30 28 25 (closed windows condition) Interior A-Weighted Incident Sound Level Angle Area Closed Open (%) Correction 252 32 32 12. 32 52 50 24 34 55 50 60 39 59 50 135 26 27 1.§. 31 51 50 ~ 33 53 50 1.§. 31 51 50 99 25 25 1/22/20 • • • ~ • • INTERIOR NOISE ANALYSIS Project Name: 2690 Roosevelt Noise Source: Traffic Noise /NBS 1978) Building Fa9ade Reflection Correction: ]. dBA Quality Correction: ]. dBA Octave Band Center Frequency: 125 Reference Exterior A-Weighted Sound Level Spectrum: 86.0 Average Room Sound Absorption: 473 Interior A-Weighted Sound Level Spectrum: 34 Exterior A-Weighted Sound Level Building Element 65 Wall. STC 46. Stucco 65 Sliding Glass Door. STC 26. 3/16" §§. Window. STC 27. 3/32"-5/16"-3/32" + 62 Wall. STC 46. Stucco 62 Window. STC 27. 3/32"-5/16"-3/32" + 62 Wall. STC 46. Stucco 62 Window. STC 27. 3/32"-5/16"-3/32" + 62 Window. STC 27. 3/32"-5/16"-3/32" + Room Name: A5-2 Living / Dining Total Interior A-Weighted Sound Level: 42 dBA CNEL (closed windows) 61 dBA CNEL o en windows 250 500 1000 2000 4000 Hertz 90.7 93.5 95.8 92.7 87.0 dB (re: total of 100) 473 473 473 473 473 Sabins 36 36 36 34 28 (closed windows condition) Interior A-Weighted Incident Sound Level Angle Area Closed Open (%) Correction 252 29 29 128 39 59 50 _g 30 49 50 162 24 25 48 33 52 50 225 26 26 42 32 52 50 42 32 52 50 1/22/20 I r I • ~ - • INTERIOR NOISE ANALYSIS Project Name: 2690 Roosevelt Noise Source: Traffic Noise /NBS 1978) Building Fac,:ade Reflection Correction: J dBA Quality Correction: J dBA Octave Band Center Frequency: 125 Reference Exterior A-Weighted Sound Level Spectrum: 86.0 Average Room Sound Absorption: 643 Interior A-Weighted Sound Level Spectrum: 33 Exterior A-Weighted Sound Level Building Element 65 Wall. STC 46, Stucco 65 Sliding Glass Door, STC 26, 3/16" 65 Window, STC 27, 3/32"-5/16"-3/32" + 62 Wall. STC 46, Stucco 62 Window, STC 27, 3/32"-5/16"-3/32" + 62 Window, STC 27, 3/32"-5/16"-3/32" + g Wall, STC 46, Stucco 62 Window, STC 27, 3/32"-5/16"-3/32" + 62 Wall. STC 46, Stucco Room Name: A8-3 Living / Dining I Kitchen Total Interior A-Weighted Sound Level: 41 dBA CNEL (closed windows) 60 dBA CNEL o en windows 250 500 1000 2000 4000 Hertz 90.7 93.5 95.8 92.7 87.0 dB (re: total of 100) 643 643 643 643 643 Sabins 34 35 35 32 27 (closed windows condition) Interior A-Weighted Incident Sound Level Angle Area Closed Open (%) Correction 252 28 28 128 38 58 , 50 12.. 29 48 50 306 26 26 48 32 51 50 fil. 32 51 50 351 26 27 42 31 50 50 42 17 18 1/22/20