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Home My WebLink AboutGPA 09-07; Palomar Commons; General Plan Amendment (GPA) (18) 446 Crestcourt Lane, Fallbrook CA 92028 phone 760-473-1253 www.ldnconsulting.net fax 760-689-4943 8/28/2012 1278-02 Palomar Commons Lowes Noise Report 1 August 28, 2012 Mr. Raab Rydeen Terramar Engineering 2888 Loker Ave east, Suite 303 Carlsbad, 92010 Subject: Lowes at Palomar Commons Development Interior Noise Assessment - Carlsbad CA The firm of Ldn Consulting is pleased to submit the following interior noise impact analysis for the proposed Lowes at Palomar Commons commercial development in the City of Carlsbad. The purpose of the survey is to determine the estimated interior noise levels within the commercial structure and recommend mitigation measures for compliance with the City of Carlsbad guidelines requirements for interior noise and with the Airport Land Use Commission conditions of approval. PROJECT LOCATION/DESCRIPTION The site is located along Palomar Airport Road west of the intersection of El Camino Real in Carlsbad, CA. The primary noise source that affects the site is from vehicular traffic from Palomar Airport Road located north of the building and aircraft activities from nearby McClellan-Palomar Airport. The project vicinity can be seen in Figure 1. The proposed project is an approximate 122,000 square-foot building and 31,000 square-foot garden center within the Palomar Commons Development. The overall Palomar Commons site plan and enlarged proposed Lowes commercial development layout are provided in Figure 2 below showing the proposed building configuration. Mr. Raab Rydeen Terramar Engineering 2888 Loker Ave east, Suite 303 Carlsbad, 92010 446 Crestcourt Lane, Fallbrook CA 92028 phone 760-473-1253 Fax 760-689-4943 8/28/2012 1278-02 Palomar Commons Lowes Noise Report 2 Figure 1: Project Site Location Project Location Mr. Raab Rydeen Terramar Engineering 2888 Loker Ave east, Suite 303 Carlsbad, 92010 446 Crestcourt Lane, Fallbrook CA 92028 phone 760-473-1253 Fax 760-689-4943 8/28/2012 1278-02 Palomar Commons Lowes Noise Report 3 Figure 2: Proposed Site Plan and Project Layout Mr. Raab Rydeen Terramar Engineering 2888 Loker Ave east, Suite 303 Carlsbad, 92010 446 Crestcourt Lane, Fallbrook CA 92028 phone 760-473-1253 Fax 760-689-4943 8/28/2012 1278-02 Palomar Commons Lowes Noise Report 4 ACOUSTICAL FUNDAMENTALS 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 base 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 Mr. Raab Rydeen Terramar Engineering 2888 Loker Ave east, Suite 303 Carlsbad, 92010 446 Crestcourt Lane, Fallbrook CA 92028 phone 760-473-1253 Fax 760-689-4943 8/28/2012 1278-02 Palomar Commons Lowes Noise Report 5 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. INTERIOR NOISE STANDARDS City of Carlsbad Noise Standards All commercial structures are to be sound-attenuated against the combined impact of all present and projected noise from exterior noise sources to meet the interior noise criteria up to 55 dB CNEL as shown in Table IV-1 of the City’s Noise Guidelines Manual. Evidence prepared under the supervision of a certified acoustical consultant that these standards will be satisfied in a manner consistent with applicable zoning and building regulations and shall be submitted in the form of a Noise Report. This material shall describe, in detail, the exterior noise environment, and the acoustical design features required to achieve interior noise standards. Conditions of Approval - Resolution NO. 2010-0038 ALUC The Board of the San Diego County Regional Airport Authority, acting in its capacity as the Airport Land Use Commission (ALUC) for San Diego County, was requested by the City of Carlsbad to determine the consistency of a proposed development project: General Plan Amendment and Zone Reclassification to Construct a Community Shopping Center at 6111 El Camino Real at Palomar Airport Road, City of Carlsbad, which is located within the Airport Influence Area (AIA) for the McClellan-Palomar Airport - Airport Land Use Compatibility Plan (ALUCP), adopted on January 25, 2010, and amended on March 4, 2010. Mr. Raab Rydeen Terramar Engineering 2888 Loker Ave east, Suite 303 Carlsbad, 92010 446 Crestcourt Lane, Fallbrook CA 92028 phone 760-473-1253 Fax 760-689-4943 8/28/2012 1278-02 Palomar Commons Lowes Noise Report 6 RESOLUTION NO. 2010-0038 ALUC states, the gas station/convenience market and car wash, bank, retail sales, and eating/drinking establishment buildings of the proposed project would be located within the 65-70 and 70-75 dB CNEL noise contours. The ALUCP identifies that more than 75 percent of the home improvement store (Lowes) would be located within the 60-65 dB CNEL noise contours as compatible with airport uses, provided that the buildings are sound attenuated to 50 dB CNEL interior noise level. Therefore, the commercial buildings of the Project must be sound attenuated to the 50 dB CNEL interior noise level as a condition of project approval. ANALYSIS PROCEDURES Exterior Noise Levels Airport Traffic Related Noise To determine the airport related noise environment and impact potentials the McClellan-Palomar Airport Land Use Compatibility Plan (ALUCP) was compared to the project site location. According to the ALUCP, 75% of the Lowes project site is inside the 60 dBA CNEL and 65 dBA CNEL noise contours from the airport (Source: Page 3-5 Exhibit III-1 of the McClellan-Palomar Airport Land Use Compatibility Plan, March 4, 2010). For the purposes of this analysis the worst case 65 dBA CNEL noise level was utilized. Roadway Traffic Related Noise To determine the future noise environment from vehicular traffic along Palomar Airport Road the Caltrans Sound32 noise model was utilized. The critical model input parameters, which determine the projected vehicular traffic noise levels, include vehicle travel speeds, the percentages of automobiles, medium trucks and heavy trucks in the roadway volume, the site conditions (hard or soft) and the peak hour traffic volume. The peak hour traffic volumes range between 6-12% of the average daily traffic (ADT) and 10% is generally acceptable for noise modeling purposes. The required coordinate Mr. Raab Rydeen Terramar Engineering 2888 Loker Ave east, Suite 303 Carlsbad, 92010 446 Crestcourt Lane, Fallbrook CA 92028 phone 760-473-1253 Fax 760-689-4943 8/28/2012 1278-02 Palomar Commons Lowes Noise Report 7 information necessary for the Sound32 traffic noise prediction model input was taken from the preliminary site plans provided by Terramar Engineering (2012). The preliminary site plans were used to identify roadways and the relationship between the noise source(s) and the receptor areas. To evaluate the future potential noise levels at the proposed development’s building facades; modeled observers were located at the facades adjacent to the roadways. Table 2 presents the roadway parameters used in the analysis including the average daily traffic volumes, vehicle speeds and the hourly traffic flow distribution (vehicle mix) for the future buildout conditions. The vehicle mix provides the hourly distribution percentages of automobile, medium trucks and heavy trucks for input into the Sound32 Model. The Buildout conditions include the future year 2030 traffic volume forecasts provided SANDAG Series 11 Traffic Prediction Model and the peak hour traffic volumes and vehicle speeds. Table 2: Future Roadway Traffic Parameters Roadway Average Daily Traffic (ADT) 1 Peak Hour Volume 2 Modeled Speeds (MPH) 1 Vehicle Mix % 3 Auto Medium Trucks Heavy Trucks Palomar Airport Road 35,000 3,500 55 96 2 2 El Camino Real 34,000 3,400 55 96 2 2 1 Source: SANDAG 2030 Traffic Prediction Model 2 10% of the ADT 3 Typical Vehicle Mixed observed in City of Carlsbad The future exterior noise levels from Palomar Airport Road and El Camino Real are provided in Table 3. As can be seen in Table 3, the future exterior noise levels from vehicular traffic along Palomar Airport Road and El Camino Real are anticipated to be 69.3 dBA CNEL and 69.4 dBA CNEL at the nearest/adjacent building façades due to the distance from the roadways, respectively. Sound levels are logarithmic and so Mr. Raab Rydeen Terramar Engineering 2888 Loker Ave east, Suite 303 Carlsbad, 92010 446 Crestcourt Lane, Fallbrook CA 92028 phone 760-473-1253 Fax 760-689-4943 8/28/2012 1278-02 Palomar Commons Lowes Noise Report 8 cannot be manipulated without being converted back to a linear scale. You must first antilog each number, add or subtract and then log them again in the following way: ܮ=10∗ܮ݋݃ ∑10ಽ೔ భబ௡௜ ݋ݎ ܮ = 10 ∗ ܮ݋݃ [10 లవ.య భబ + 10లవ.ర భబ ] = 72.4 dBA CNEL Adding the two noise sources yields a cumulative future noise level of 72.41 dBA CNEL. Table 3: Future Roadway Traffic Noise Levels Receptor Description Building Façade Noise Level (dBA CNEL) North Building Façade (276 feet) 69.3 Eastern Building Façade (263 feet) 69.4 Combined Roadway Noise 72.4 * Noise model does not account for topography or any shielding. Cumulative Future Noise Level Based on the exterior noise model for the roadways the worst-case combined exterior noise level at the building façade of the site is 72.4 dBA CNEL. The airport related activities at the site was found to be between the 60 dBA CNEL and 65 dBA CNEL contours. To be conservative a sound level of 65 dBA CNEL was utilized from the aircraft activities. The combination of the roadway and aircraft activities was combined to determine the overall cumulative noise levels at the building facades. Utilizing the same methodology to combine the noise levels results is a worst case building façade noise level of 73.1 dBA CNEL. In order to reduce the noise levels from roughly 73 dBA CNEL to the commercial 50 dBA CNEL interior standard, a 23 dBA CNEL reduction is required. New construction with the windows closed will generally produce a noise reduction ranging from 25 dBA to 30 dBA. Interior noise modeling was conducted to determine the noise reductions and building materials needed to reduce the interior noise to the acceptable level of 50 dBA CNEL. Mr. Raab Rydeen Terramar Engineering 2888 Loker Ave east, Suite 303 Carlsbad, 92010 446 Crestcourt Lane, Fallbrook CA 92028 phone 760-473-1253 Fax 760-689-4943 8/28/2012 1278-02 Palomar Commons Lowes Noise Report 9 Interior Noise Levels 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 15 dBA with a windows open conditions and 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 Hertz - 4000 Hertz. Acoustical modeling of the proposed project 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, exterior doors, roof assembly 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, building façade 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 SSOE, Inc. July 2012. The following construction details were utilized for each of the building assemblies to determine the noise reduction characteristics: Mr. Raab Rydeen Terramar Engineering 2888 Loker Ave east, Suite 303 Carlsbad, 92010 446 Crestcourt Lane, Fallbrook CA 92028 phone 760-473-1253 Fax 760-689-4943 8/28/2012 1278-02 Palomar Commons Lowes Noise Report 10 Exterior walls consist of 8 inch concrete tilt up having a Sound Transmission Class (STC) rating of 56 or better. The roof assembly is a minimum of 1½ inch rigid installation/sheathing over 22 gauge metal with sky lighting having a minimum STC rating of 30 or better. Glass assemblies should have a minimum STC rating of 26 for both the windows and glass doors and have acoustical sealant applied around the exterior edges. The glass assemblies are generally the weakest noise reducing component but are the most convenient and cost effective elements to change if additional attenuation is needed. The STC ratings for the described assemblies were calculated in the interior noise model and provided in the findings below. The proposed building has limited amounts of glass and is mostly comprised of concrete tilt up walls and the fixed roof assembly. Bathrooms, kitchens, or storage areas are not required to meet the 50 dBA CNEL standard and therefore were not modeled. All common use, office and training or break room areas where lower noise levels are essential for conversation were modeled to determine the interior noise reductions. If the modeled interior noise levels were found to be higher than 50 dBA CNEL with the minimum assembly requirements described above, additional modeling was performed to determine the minimum STC rating for the assemblies to further reduce interior noise levels below the acceptable interior threshold of 50 dBA CNEL. FINDINGS The exterior noise levels were determined to be 73.1 dBA CNEL with the combination of vehicle and aircraft activities. Basic calculations show that a windows open condition will only reduce the interior noise levels 15-20 dBA CNEL and not provide adequate interior noise mitigation. To meet the 50 dBA CNEL interior noise standard, an overall minimum interior noise level reduction of roughly 23 dBA CNEL is needed for the proposed project. Therefore a closed window condition is required to reduce interior noise levels to comply with the City of Carlsbad and project conditional of approval 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. Mr. Raab Rydeen Terramar Engineering 2888 Loker Ave east, Suite 303 Carlsbad, 92010 446 Crestcourt Lane, Fallbrook CA 92028 phone 760-473-1253 Fax 760-689-4943 8/28/2012 1278-02 Palomar Commons Lowes Noise Report 11 The interior noise levels were calculated based on the assemblies identified above and the modeled results for the offices, training room, break room and common use areas are provided in Table 4. The modeled results with the anticipated interior noise level of 50 dBA CNEL or less are provided as Attachment A to this report. Table 4: Interior Noise Level Findings Use Type Modeled Interior Noise Level Results (dBA CNEL) Complies with the 50 dBA CNEL Interior Noise Level Standard Common Use – Product Floor 48.5 Yes Reception - Entry 48.7 Yes Office (Manager) 48.4 Yes Office (Assistant Manager) 48.5 Yes Office (LP) 48.4 Yes Break Room 48.4 Yes Training Room 48.4 Yes No impacts are anticipated with the incorporation of the identified building assemblies as can been seen in Table 4. If you have any questions, please do not hesitate to contact me directly at (760) 473-1253 or jlouden@ldnconsulting.net. Sincerely, Ldn Consulting, Inc. Jeremy Louden Principal Attachments: Interior Noise Model Calculations Project Name: Lowes Carlsbad Ldn Consulting Building or Unit(s) 1 Floor Level 1 Date: 8/27/12 Arch Plan: 1 Room Type: Entire Building Project # 12-78 Exterior Noise Levels dBA CNEL 125 250 500 1000 2000 4000 Exterior Noise Level (Traffic Spectrum)73.1 59.1 63.8 66.6 68.9 65.8 60.1 Correction for Angle and Façade 3 62.1 66.8 69.6 71.9 68.8 63.1 Adjusted Building Façade Levels 76.1 62.1 66.8 69.6 71.9 68.8 63.1 Transmission Loss (TL) Exterior Assembly Source Area STC 125 250 500 1000 2000 4000 Stucco NBS W-50-71 49740 56 35 46 54 62 68 73 Windows Milgard 0 26 21 17 25 32 37 38 Fixed Window Milgard 400 26 17 16 22 31 35 27 Glass Doors Milgard 0 26 21 24 27 27 24 28 Exterior Door NBS Monograph 77 0 26 21 24 27 27 24 28 Roof CA ONC 122000 30 19 22 26 34 37 34 Room Absorption (RA) Interior 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 -49.9 -49.9 -49.9 -49.9 -49.9 -49.9 Noise Level Increase for Defects and Exposed Surface Area 18.6 18.6 18.6 18.6 18.6 18.6 Overall Reduction from Transmission Loss + Room Absorption - Surface Exposure 24.6 Building Façade Noise Level (dBA CNEL)73.1 Resultant Interior Noise Level (dBA CNEL)48 INTERIOR NOISE CALCULATIONS Transmission Loss (dB) Frequency (Hz.) Absorption Coefficients Frequency (Hz.) Frequency (Hz.) Project Name: Lowes Carlsbad Ldn Consulting Building or Unit(s) 1 Floor Level 1 Date: 8/27/12 Arch Plan: 1 Room Type: Receptor - Entry Project # 12-78 Exterior Noise Levels dBA CNEL 125 250 500 1000 2000 4000 Exterior Noise Level (Traffic Spectrum)73.1 59.1 63.8 66.6 68.9 65.8 60.1 Correction for Angle and Façade 3.0 62.1 66.8 69.6 71.9 68.8 63.1 Adjusted Building Façade Levels 76.1 62.1 66.8 69.6 71.9 68.8 63.1 Transmission Loss (TL) Exterior Assembly Source Area STC 125 250 500 1000 2000 4000 Stucco NBS W-50-71 17190 56 35 46 54 62 68 73 Windows Milgard 0 26 21 17 25 32 37 38 Fixed Window Milgard 800 26 17 16 22 31 35 27 Glass Doors Milgard 0 26 21 24 27 27 24 28 Exterior Door NBS Monograph 77 160 26 21 24 27 27 24 28 Roof CA ONC 51570 30 19 22 26 34 37 34 Room Absorption (RA) Interior 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 -46.2 -46.2 -46.2 -46.2 -46.2 -46.2 Noise Level Increase for Defects and Exposed Surface Area 19.7 19.7 19.7 19.7 19.7 19.7 Overall Reduction from Transmission Loss + Room Absorption - Surface Exposure 24.4 Building Façade Noise Level (dBA CNEL)73.1 Resultant Interior Noise Level (dBA CNEL)49 Frequency (Hz.) INTERIOR NOISE CALCULATIONS Frequency (Hz.) Transmission Loss (dB) Frequency (Hz.) Absorption Coefficients Project Name: Lowes Carlsbad Ldn Consulting Building or Unit(s) 1 Floor Level 1 Date: 8/27/12 Arch Plan: 1 Room Type: Office 1 Project # 12-78 Exterior Noise Levels dBA CNEL 125 250 500 1000 2000 4000 Exterior Noise Level (Traffic Spectrum)73.1 59.1 63.8 66.6 68.9 65.8 60.1 Correction for Angle and Façade 3.0 62.1 66.8 69.6 71.9 68.8 63.1 Adjusted Building Façade Levels 76.1 62.1 66.8 69.6 71.9 68.8 63.1 Transmission Loss (TL) Exterior Assembly Source Area STC 125 250 500 1000 2000 4000 Stucco NBS W-50-71 0 56 35 46 54 62 68 73 Windows Milgard 0 26 21 17 25 32 37 38 Fixed Window Milgard 0 26 17 16 22 31 35 27 Glass Doors Milgard 0 26 21 24 27 27 24 28 Exterior Door NBS Monograph 77 0 26 21 24 27 27 24 28 Roof CA ONC 120 30 19 22 26 34 37 34 Room Absorption (RA) Interior 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 -19.8 -19.8 -19.8 -19.8 -19.8 -19.8 Noise Level Increase for Defects and Exposed Surface Area 20.8 20.8 20.8 20.8 20.8 20.8 Overall Reduction from Transmission Loss + Room Absorption - Surface Exposure 24.7 Building Façade Noise Level (dBA CNEL)73.1 Resultant Interior Noise Level (dBA CNEL)48 Absorption Coefficients Frequency (Hz.) INTERIOR NOISE CALCULATIONS Frequency (Hz.) Transmission Loss (dB) Frequency (Hz.) Project Name: Lowes Carlsbad Ldn Consulting Building or Unit(s) 1 Floor Level 1 Date: 8/27/12 Arch Plan: 1 Room Type: Office 2 Project # 12-78 Exterior Noise Levels dBA CNEL 125 250 500 1000 2000 4000 Exterior Noise Level (Traffic Spectrum)73.1 59.1 63.8 66.6 68.9 65.8 60.1 Correction for Angle and Façade 3.0 62.1 66.8 69.6 71.9 68.8 63.1 Adjusted Building Façade Levels 76.1 62.1 66.8 69.6 71.9 68.8 63.1 Transmission Loss (TL) Exterior Assembly Source Area STC 125 250 500 1000 2000 4000 Stucco NBS W-50-71 300 56 35 46 54 62 68 73 Windows Milgard 0 26 21 17 25 32 37 38 Fixed Window Milgard 0 26 17 16 22 31 35 27 Glass Doors Milgard 0 26 21 24 27 27 24 28 Exterior Door NBS Monograph 77 0 26 21 24 27 27 24 28 Roof CA ONC 130 30 19 22 26 34 37 34 Room Absorption (RA) Interior 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 -20.2 -20.2 -20.2 -20.2 -20.2 -20.2 Noise Level Increase for Defects and Exposed Surface Area 13.9 13.9 13.9 13.9 13.9 13.9 Overall Reduction from Transmission Loss + Room Absorption - Surface Exposure 24.6 Building Façade Noise Level (dBA CNEL)73.1 Resultant Interior Noise Level (dBA CNEL)48 Frequency (Hz.) Absorption Coefficients Frequency (Hz.) INTERIOR NOISE CALCULATIONS Frequency (Hz.) Transmission Loss (dB) Project Name: Lowes Carlsbad Ldn Consulting Building or Unit(s) 1 Floor Level 1 Date: 8/27/12 Arch Plan: 1 Room Type: Office 3 Project # 12-78 Exterior Noise Levels dBA CNEL 125 250 500 1000 2000 4000 Exterior Noise Level (Traffic Spectrum)73.1 59.1 63.8 66.6 68.9 65.8 60.1 Correction for Angle and Façade 3.0 62.1 66.8 69.6 71.9 68.8 63.1 Adjusted Building Façade Levels 76.1 62.1 66.8 69.6 71.9 68.8 63.1 Transmission Loss (TL) Exterior Assembly Source Area STC 125 250 500 1000 2000 4000 Stucco NBS W-50-71 0 56 35 46 54 62 68 73 Windows Milgard 0 26 21 17 25 32 37 38 Fixed Window Milgard 0 26 17 16 22 31 35 27 Glass Doors Milgard 0 26 21 24 27 27 24 28 Exterior Door NBS Monograph 77 0 26 21 24 27 27 24 28 Roof CA ONC 100 30 19 22 26 34 37 34 Room Absorption (RA) Interior 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 -19.0 -19.0 -19.0 -19.0 -19.0 -19.0 Noise Level Increase for Defects and Exposed Surface Area 20.0 20.0 20.0 20.0 20.0 20.0 Overall Reduction from Transmission Loss + Room Absorption - Surface Exposure 24.7 Building Façade Noise Level (dBA CNEL)73.1 Resultant Interior Noise Level (dBA CNEL)48 Transmission Loss (dB) Frequency (Hz.) Absorption Coefficients Frequency (Hz.) INTERIOR NOISE CALCULATIONS Frequency (Hz.) Project Name: Lowes Carlsbad Ldn Consulting, Inc. Building or Unit(s) All Floor Level 1 Date: 8/27/12 Arch Plan: 1 Room Type: Breakroom Project # 12-78 Exterior Noise Levels dBA CNEL 125 250 500 1000 2000 4000 Exterior Noise Level (Traffic Spectrum)73.1 59.1 63.8 66.6 68.9 65.8 60.1 Correction for Angle and Façade 3.0 62.1 66.8 69.6 71.9 68.8 63.1 Adjusted Building Façade Levels 76.1 62.1 66.8 69.6 71.9 68.8 63.1 Transmission Loss (TL) Exterior Assembly Source Area STC 125 250 500 1000 2000 4000 Stucco NBS W-50-71 600 56 35 46 54 62 68 73 Windows Milgard 0 26 21 17 25 32 37 38 Fixed Window Milgard 0 26 17 16 22 31 35 27 Glass Doors Milgard 0 26 21 24 27 27 24 28 Exterior Door NBS Monograph 77 0 26 21 24 27 27 24 28 Roof CA ONC 500 30 19 22 26 34 37 34 Room Absorption (RA) Interior 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 -26.0 -26.0 -26.0 -26.0 -26.0 -26.0 Noise Level Increase for Defects and Exposed Surface Area 14.4 14.4 14.4 14.4 14.4 14.4 Overall Reduction from Transmission Loss + Room Absorption - Surface Exposure 24.7 Building Façade Noise Level (dBA CNEL)73.1 Resultant Interior Noise Level (dBA CNEL)48 Frequency (Hz.) Transmission Loss (dB) Frequency (Hz.) Absorption Coefficients Frequency (Hz.) INTERIOR NOISE CALCULATIONS Project Name: Lowes Carlsbad Ldn Consulting, Inc. Building or Unit(s) All Floor Level 1 Date: 8/27/12 Arch Plan: 1 Room Type: Training Room Project # 12-78 Exterior Noise Levels dBA CNEL 125 250 500 1000 2000 4000 Exterior Noise Level (Traffic Spectrum)73.1 59.1 63.8 66.6 68.9 65.8 60.1 Correction for Angle and Façade 3.0 62.1 66.8 69.6 71.9 68.8 63.1 Adjusted Building Façade Levels 76.1 62.1 66.8 69.6 71.9 68.8 63.1 Transmission Loss (TL) Exterior Assembly Source Area STC 125 250 500 1000 2000 4000 Stucco NBS W-50-71 600 56 35 46 54 62 68 73 Windows Milgard 0 26 21 17 25 32 37 38 Fixed Window Milgard 0 26 17 16 22 31 35 27 Glass Doors Milgard 0 26 21 24 27 27 24 28 Exterior Door NBS Monograph 77 0 26 21 24 27 27 24 28 Roof CA ONC 400 30 19 22 26 34 37 34 Room Absorption (RA) Interior 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 -25.1 -25.1 -25.1 -25.1 -25.1 -25.1 Noise Level Increase for Defects and Exposed Surface Area 14.4 14.4 14.4 14.4 14.4 14.4 Overall Reduction from Transmission Loss + Room Absorption - Surface Exposure 24.7 Building Façade Noise Level (dBA CNEL)73.1 Resultant Interior Noise Level (dBA CNEL)48 Frequency (Hz.) INTERIOR NOISE CALCULATIONS Frequency (Hz.) Transmission Loss (dB) Frequency (Hz.) Absorption Coefficients