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Home My WebLink AboutCT 13-04; GOLDEN SURF; ACOUSTICAL ANALYSIS REPORT; 2014-07-21ABC ACOUSTICS, INC. Since 1985 www.abcacoustics.com p. (858) 550-9055 F. (858) 550-9005 ACOUSTICAL ANALYSIS REPORT CARLSBAD PM 6136 City of Carlsbad, California PREPARED FOR: Farzan Dehmoubed 6798 Paseo del Norte Carlsbad, CA 92011 ABC Report No: 2314 July 21, 2014 TABLE OF CONTENTS SEaiON TITLE PAGE 1.0 INTRODUCTION 1 2.0 PROJEa DESCRIPTION 3 3.0 APPLICABLE STANDARDS 5 3.1 Exterior Noise Standards 5 3.2 Exterior-to-lnterior Noise standards 5 4.0 NOISE IMPACT ASSESSMENT 7 5.0 CONDITIONS OF DEVELOPMENT & MITIGATION 8 5.1 Exterior Noise Attenuation 8 5.2 Interior Noise attenuation 8 6.0 REFERENCES CITED 9 7.0 CERTIFICATION 10 UST OF FIGURES FIGURE TITLE PAGE 1 VICINITY MAP 2 2 SITE PLAN 4 LIST OF TABLES TABLE TITLE PAGE 1 CITY OF CARLSBAD LAND USE-NOISE COMPATIBILITY GUIDELINES 6 ATTACHMENTS ATTACHMENT "A" - NOISE CALCULATION DATA Carlsbad PM 6136 1.0 INTRODUaiON: The proposed Carlsbad PM 6136 project consists of five (5) new single-family homes located within the City of Carlsbad, California. The project site is located along Camino de las Ondas (Figure 1). As presented in Figure 1, the project site is located at close proximity of Camino Del Norte. The City of Carlsbad has requested an Acoustical Analysis Report to ensure compliance of the project with exterior and interior noise impacts with applicable noise standard. This report addresses the exterior & interior noise levels impacting Carlsbad PM 6136. This report is based on design information provided by Farzan Dehmoubed. It also makes use ofthe results of sound measurements conducted at the project site and noise calculations based on available traffic data. The following sections of this report include a description of the project site, a discussion of the applicable standards, results of acoustical analysis and acoustical treatment recommendations, if any, to improve interior acoustics of the project to 45 dB-A LDN or lower, as required by the City of Carlsbad. ABC Acoustics, Inc. Report 2256 Page 1 Carlsbad PM6136 VICINITY MAP CITY OF OCEANSIDE HIGHWAYj^^ NOT TO SCALE CITY OF VISTA CITY OF SAN MARCOS PACIFIC OCEAN FIGURE 1: VICINITY MAP N ABC Acoustic Inc (ABC) Report: 2314 Carlsbad PM6136 2.0 PROJECT DESCRIPTION: The proposed Carlsbad PM 6136 project consists of five (5) new single-family homes located within the City of Carlsbad, California. The project site is located along Camino de las Ondas (Figure 1). The site is currently vacant and being graded. A Site Plan for the project is included in Figure 2. As presented in Figure 2, only one of the five units would abut Camino de las Ondas. The remaining 4 would have increased setbacks and pads that are at a lower elevation than the abutting street pavement. Noise sources of potential significance are due to vehicular traffic along Camino de las Ondas and Paseo del Norte. Camino de las Ondas is a 2-lane local collector street while Paseo del Norte is a 4-lane major roadway. The unit closest to Camino de las Ondas would receive the highest noise impacts because of proximily to both roadways. This unit is approximately 150 feet from the centerline of Paseo del Norte. ABC Acoustic Inc (ABC) Report: 2314 Carlsbad PM6136 FIGURE 2: SITE PLAN N ABC Acoustic Inc (ABC) Report: 2314 Carisbad PM6\36 3.0 APPUCABLE STANDARDS: 3.1 Exterior Noise Standards: The City of Carlsbad has established a set of community noise standards which identify compatible outdoor and indoor noise levels for various types of land uses (Table 1). As presented in Table 1, the maximum compatible exterior noise level for residential land uses is 60 dSA Ldn. If the exterior noise level exceeds the maximum compatible levels, measures should be examined to reduce such impacts to below a level of significance at the project site. 3.2 Exterior-to-lnterior Noise Standards: If exterior noise levels cannot be reduced to acceptable levels by practical means, specific design and construction techniques must be incorporated to reduce the interior noise levels. The maximum Interior noise limit for residential land uses within the City of Carlsbad is 45 dS-A Ldn. Units of noise are expressed as decibels (dB) and the "A"-weighted noise scale is used because it closely approximates the perception of loudness by humans. Ldn (Day-Night Community Noise Level) is the energy-averaged time-weighted annual noise level over a 24 hour period. Time-weighting technique applies a penalty to the actual hourly noise levels during certain periods of evening and/or nighttime hours. Ldn applies a 10 dB-A penalty to the nighttime hours of 10 pm to the following 7 am. This penalty was selected to reflect people's sensitivity to noise as a function of activity. Community Noise Equivalent Level (CNEL) is similar to Ldn except it has an additional 5 dB penalty applied to the evening hours of 7 pm to 10 pm. Ldn and CNEL are often used interchangeably. ABC Acoustic Inc (ABC) Report: 2314 Carlsbad PM6136 TABLE 1: CITY OF CARLSBAD LAND USE COMPATIBILITY GUIDELINES FOR COMMUNITY NOISE ENVIRONMENT ABC Acoustic Inc (ABC) Report: 2314 Carlsbad PM6136 4.0 NOISE IMPAa ASSESSMENT: The cumulative hourly noise levels at the project site were measured during peak hours of afternoon traffic on Thursday June 26, 2014. The existmg cumulative hourly average noise levels (Leqh) on the project site were measured to be 59 dB-A at 40 feet from the centerline of Camino de las Ondas. Noise levels were substantially lower towards interior of the site, primarily because of line-of-sight obstruction. Existing noise levels within interior ofthe site (i.e., at 4 remaining homes) range between 52 and 55 dB-A Leqh. For comparative purposes, noise levels at the project site were also calculated using the existing and future (year 2035) traffic data provided by Sandag. Data utilized and results of calculations are presented in Attachment "A". As presented in Tables A-1 of Attachment "A", calculated resulta are in general agreement with the measured levels. As indicated in Section 3.1 ofthis report, the City of Carlsbad requires all new residential structures to be located within an exterior noise environment of 60 dB-A Ldn or lower. Therefore, the exterior noise levels impacting the project site are in compliance with the applicable limit. ABC Acoustic Inc (ABC) Report: 2314 Carlsbad PM6136 5.0 CONDITIONS OF DEVELOPMENT AND MITIGATION: 5.1 Exterior Noise Attenuation: Exterior noise levels impacting the project site are within the allowable limit of 60 dBA Ldn. Since exterior noise impacts are in compliance, no exterior noise abatement measures are recommended. 5.2 Interior Noise Attenuation: California light-frame residential structure provides for 15 dB exterior-to- interior noise reduction with windows open. Therefore, since exterior noise impacts at the project site do not exceed 60 dBA Ldn, interior noise impacts would not exceed 45 dBA Ldn. Hence, no interior noise abatement measures are recommended. ABC Acoustic Inc (ABC) Report: 2314 Carlsbad PM6136 7.0 REFERNCES CITED: California, State of; Uniform Building Codes 2005 Section 1203 of the California Building Codes (CBC). Carlsbad, City of 2011 Draft General Plan, Noise Element Skeels Design 2010 Site Plan for Carlsbad PM 6136 Five New Homes Addition; U.S. Department of Health, Education, and Welfare 1975 Compendium of Materials for Noise Control. U.S. Department of Transportation, Federal Highway Administration 1978 Highway Traffic Noise Prediction Model (FHWA-RD-77-108). ABC Acoustic Inc (ABC) Report: 2314 Carlsbad PM6136 8.0 CERTIFICATION: The findings and recommendations presented in this acoustical analysis report are based on available information at the time of analysis. They represent a true and factual analysis of the potential acoustical issues associated with the subject Carlsbad PM 6136 project. There are many factors involved in actual acoustical performance of a structure, and since ABC Acoustics, Inc. has no control over the construction, workmanship and building materials performance, ABC Acoustics, Inc. is specifically not liable for final results of any recommendations or implementation of such recommendations unless if ABC Acoustics, Inc. is retained to review all submittals, participate in material selection, conduct inspection(s) during construction of the project, and perform confirmation testing. This report was prepared by Sharo T. Sanavi. ABC Acoustics Inc (ABC) (^/u//m ^^(^(Mum- Sharo T. Sanavi Principal sharo@abcacoustics.com ABC Acoustic Inc (ABC) Report: 2314 10 Carlsbad PM6136 ATTACHMENT "A" NOISE CALCULATION DATA ABC Acoustic Inc (ABC) Report: 2314 11 TABLE A-1 CARLSBAD PM 6136 ACOUSTICAL ANALYSIS (ABC PROJ.# 2314) PRESENT UNATTENUATED NOISE LEVELS OF PASEO DEL NORTE ALL LANES COMBINED SOURCE OF DATA: SANDAG INPUT DATA: AVERAGE DAILY TRAFFIC PERCENT MEDIUM TRUCK PERCENT HEAVY TRUCK AUTO SPEED (MILES PER HOUR) MEDIUM TRUCK SPEED (MILES PER HOUR) HEAVY TRUCK SPEED (MILES PER HOUR) GRADE (PERCENT) MEDIAN (FEET) NUMBER OF LANES LEFT ANGLE/RIGHT SITE PARAMETER - ANGLE Soft Site/Hard Site 7,500.00 1.00 0.10 45.00 40.00 35.00 2.00 0.00 4 -45/ 45 0.5/0.0 BARRIER CALCULATION DATA: BARRIER TO Source/Receiver (Feet) ELEVATIONS (MSL) - Road/Barrier-Top/Receiver BARRIER HEIGHT (Feet) N/A N/A N/A CALCULATION RESULTS AUTOS MEDIUM TRUCKS HEAVY TRUCKS VEHICLE PER HOUR - DAY VEHICLE PER HOUR - NIGHT EQUIVALENT DISTANCE (METERS) 430. 107. 45. 22 14 39 4.35 1.08 45.39 0.44 0.11 45.39 REFERENCE NOISE LEVELS 69. 34 76.31 80.05 FLOW ADJUSTMENT - DAY FLOW ADJUSTMENT - NIGHT -5. -11. 50 54 -24.94 -30.99 -34.31 -40.33 DISTANCE ADJUSTMENT (Soft Site) DISTANCE ADJUSTMENT (Hard Site) -7. -4. 21 81 -7.21 -4.81 -7.21 -4.81 FINITE ROADWAY ADJUSTMENT (Soft FINITE ROADWAY ADJUSTMENT (Hard Site) Site) -3. -3. 00 01 -3.00 -3.01 -3.00 -3.01 GRADE ADJUSTMENT BARRIER ATTENUATION 0. 0. 00 00 0.00 0.00 0.00 0.00 PRESENT UNATTENUATED NOISE LEVEL DUE TO TRAFFIC ON ALL LANES COMBINED AT 150 FEET FROM THE CENTERLINE OF THE ROADWAY IS: 55.9 dB-A Ldn for Soft Site 58.2 dB-A Ldn for Hard Site ::: CALVENO MODEL (FHWA/CA/TL-84/13) Ver. 4.2 ::: DEVELOPED AND STRICTLY UTILIZED BY ABC ACOUSTICS TABLE A-2 CARLSBAD PM 6136 ACOUSTICAL ANALYSIS (ABC PROJ.# 2314) FUTURE UNATTENUATED NOISE LEVELS OF PASEO DEL NORTE ALL LANES COMBINED SOURCE OF DATA: SANDAG INPUT DATA: AVERAGE DAILY TRAFFIC PERCENT MEDIUM TRUCK PERCENT HEAVY TRUCK AUTO SPEED (MILES PER HOUR) MEDIUM TRUCK SPEED (MILES PER HOUR) HEAVY TRUCK SPEED (MILES PER HOUR) GRADE (PERCENT) MEDIAN (FEET) NUMBER OF LANES LEFT ANGLE/RIGHT ANGLE SITE PARAMETER - Soft Site/Hard Site BARRIER CALCULATION DATA: BARRIER TO Source/Receiver (Feet) ELEVATIONS (MSL) - Road/Barrier-Top/Receiver BARRIER HEIGHT (Feet) 8,100.00 1.00 0.10 45.00 40.00 35.00 2.00 0.00 4 -45/ 45 0.5/0.0 N/A N/A N/A CALCULATION RESULTS: AUTOS MEDIUM TRUCKS HEAVY TRUCKS VEHICLE PER HOUR - DAY 464. 63 4 .70 0. 47 VEHICLE PER HOUR - NIGHT 115. 71 1 . 17 0. 12 EQUIVALENT DISTANCE (METERS) 45. 39 45 .39 45. 39 REFERENCE NOISE LEVELS 69. 34 76 .31 80. 05 FLOW ADJUSTMENT - DAY -5. 17 -24 .61 -34. 03 FLOW ADJUSTMENT - NIGHT -11. 21 -30 .65 -39. 96 DISTANCE ADJUSTMENT (Soft Site) -7. 21 -7 .21 -7. 21 DISTANCE ADJUSTMENT (Hard Site) -4. 81 -4 .81 -4. 81 FINITE ROADWAY ADJUSTMENT (Soft Site) -3. 00 -3 .00 -3. 00 FINITE ROADWAY ADJUSTMENT (Hard Site) -3. 01 -3 .01 -3. 01 GRADE ADJUSTMENT 0. 00 0 .00 0. 00 BARRIER ATTENUATION 0. 00 0 .00 0. 00 FUTURE UNATTENUATED NOISE LEVEL DUE TO TRAFFIC ON ALL LANES COMBINED AT 150 FEET FROM THE CENTERLINE OF THE ROADWAY IS: 56.2 dB-A Ldn for Soft Site 58.6 dB-A Ldn for Hard Site ::: CALVENO MODEL (FHWA/CA/TL-84/13) Ver. 4.2 :: DEVELOPED AND STRICTLY UTILIZED BY ABC ACOUSTICS