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<br />Eilar Associates, Inc.
<br />210 South Juniper Street, Suite 100 Vicinity Map Figure 1
<br />Escondido, California 92025 Job # S220404
<br />760-738-5570
<br />Orange County
<br />Assessor's
<br />Parcel Numbers:
<br />398-325-01
<br />398-330-01
<br />398-330-02
<br />398-330-03
<br />398-330-04
<br />398-330-05
<br />398-330-06
<br />398-330-07
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<br />398-330-09
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<br />Eilar Associates, Inc.
<br />210 South juniper Strut, SLdtC I00
<br />Escondido, California 920253
<br />760-738-5570
<br />5TH ST
<br />39832501
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<br />Eilar Associates, Inc.
<br />210 South Juniper Street, Suite 100
<br />Escondido, California 92025
<br />760-738-5570
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<br />Satellite Aerial Photograph
<br />Job # S220404
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<br />Figure 3
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<br />Eilar Associates, Inc.
<br />Acoustical and Environmental Consulting Services
<br />8.0 References
<br />City of Santa Ana Noise Element to the General Plan, April 2022.
<br />2019 California Building Code, Based on the International Building Code, Chapter 12, Section 1206 — Sound
<br />Transmission Control.
<br />California Green Building Code, Nonresidential Mandatory Measures.
<br />Traffic Census 2017-2018, City of Santa Ana Public Works Agency, Transportation and Traffic Division.
<br />Federal Highway Administration, Highway Traffic Noise: Analysis and Abatement Guide, December 2011.
<br />URS Corporation, Noise and Vibration Technical Report in support of the Santa Ana and Garden Grove Fixed
<br />Guideway Corridor Study, February 2012.
<br />Harris Miller Miller & Hanson, Inc., CREATE Freight Noise and Vibration Model, 2006.
<br />DataKustik, CadnaA (Computer Aided Noise Abatement), Version 2022.
<br />Federal Highway Administration, Traffic Noise Model Version 2.5.
<br />Wyle Laboratories, Development of Ground Transportation Systems Noise Contours for the San Diego
<br />Region, December 1973.
<br />Traffic Distribution Study, by Katz-Okitsu and Associates Traffic Engineers, 1986.
<br />U.S. Environmental Protection Agency Office of Noise Abatement and Control, Information on Levels of
<br />Environmental Noise Requisite to Protect Public Health and Welfare With an Adequate Margin of Safety,
<br />March 1974.
<br />Marshall Day Acoustics, INSUL Version 9.0, 2017.
<br />California Office of Noise Control, Catalog of STC and IIC Ratings for Wall and Floor/Ceiling Assemblies
<br />with TL and ISPL Data Plots,1981.
<br />Institute for Research in Construction, National Research Council of Canada, Gypsum Board Walls:
<br />Transmission Loss Data, March 1998.
<br />�koustical Analysis Report for 4th and Mortimer • Job # S220404 • July 18, 2022 Page 1''
<br />J.
<br />Eilar Assoc*at sF, iin,c.`�
<br />r cousticul a uu)III -ntal CO�Jdt(t11�tS
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<br />Eilar Associates, Inc.
<br />Acoustical and Environmental Consulting Services
<br />Limitations
<br />Actual achieved STC and IIC ratings are determined by the quality of construction and attention to details in
<br />the installation of assemblies. Please be advised that this endorsement is strictly contingent upon observance
<br />of proper installation procedures. It is imperative that attention be paid to details such as the proper installation
<br />of resilient channels and/or clips and the isolation of the floor/ceiling assembly from the wall (using a
<br />perimeter isolation strip) to prevent vibration through the structure. Additionally, all cracks or gaps must be
<br />sealed with an acoustical sealant,such as the OSI SC175 or Pecora sealants see Appendix G . With these
<br />( PP )
<br />conditions met and the recommendations listed above, the assemblies detailed above should meet minimum
<br />building code standards for controlling sound and impact transmission.
<br />The following additional considerations should also be taken into account:
<br />• The use of recessed lighting in this type of construction is strongly discouraged, as it compromises the
<br />STC and IIC of the floor/ceiling assembly; however, if recessed lighting must be used, a sealed and
<br />vibration -isolated box may be constructed around the light fixture using two layers of gypsum board
<br />to maintain the sound and impact ratings of the assembly as much as feasible.
<br />• Placing outlet boxes back-to-back in the same stud cavity should be avoided. A sound deadening fire -
<br />stop putty pad system should be installed around the back of all outlet boxes in the common wall to
<br />provide additional acoustical privacy. Pads are sized to fit a typical 1-1/2-inch-deep 4S box with no
<br />cutting or piercing required. The pads have tested and proven fire resistance and sound -deadening
<br />acoustical properties.
<br />• Regardless of the type of construction, all manufacturer instructions for the selected acoustical
<br />underlayment must be followed closely to ensure proper installation that will provide the desired
<br />acoustical performance.
<br />The above recommendations should be considered as much as possible in the construction of the common
<br />wall and floor/ceiling assemblies for this project.
<br />6.0 Conclusion
<br />The City of Santa Ana Noise Element to the General Plan states that exterior noise levels at common outdoor
<br />use areas of multi -family residential properties should not exceed 65 CNEL. Calculations show that, with a
<br />four -foot high sound barrier along the southern barrier of the Building B courtyard in place, exterior noise
<br />levels at the common outdoor use areas are expected to meet the exterior noise limit of 65 CNEL. Please refer
<br />to Figure 7 for a graphical representation of the required sound barrier location.
<br />The City of Santa Ana and the State of California require interior noise levels not exceeding 45 CNEL in
<br />habitable space. Calculations show that future noise levels on site are expected to exceed 60 CNEL at most
<br />building facades; therefore, interior noise levels may exceed 45 CNEL within units without appropriate design
<br />features in place. Calculations show that with typical exterior wall assemblies, exterior glazing with an STC
<br />rating of 28, and mechanical ventilation in all units, all interior residential space is expected to comply with City
<br />of Santa Ana and State of California noise requirements. Additionally, with proposed exterior wall construction
<br />and standard commercial glazing in place, exterior noise levels in non-residential spaces are expected to meet
<br />the noise limits of the City of San Diego Noise Element to the General Plan.
<br />Acoustical Analysis Report for 4th and Mortimer • Job # S220404 • July 18, 2022 Page 16
<br />Eilar Associates, Inc.
<br />Acoustical and Environmental Consulting Services
<br />Common wall and floor/ceiling assemblies recommended herein are expected to meet the minimum required
<br />ratings dictated by the State of California Building Code Section 1206 for Sound Transmission Class (STC) and
<br />Impact Insulation Class (IIC). These assemblies should be incorporated into project plans prior to building
<br />permit submittal.
<br />7.0 Certification
<br />All recommendations for noise control are based on the best information available at the time our consulting
<br />services are provided. However, as there are many factors involved in sound and impact transmission, and
<br />Eilar Associates has no control over the construction, workmanship, or materials, Eilar Associates is specifically
<br />not liable for final results of any recommendations or implementation of the recommendations.
<br />The findings and recommendations of this acoustical analysis report are based on the information available and
<br />are a true and factual analysis of the potential acoustical issues associated with the 4th and Mortimer project, to
<br />be located at the northeast and northwest corners of 4th Street and Mortimer Street in the City of Santa Ana,
<br />California. This report was prepared by Mo Ouwenga and Jonathan Brothers
<br />Mo Ouwenga, INCE Jonathan Brothers, INCE
<br />Acoustical Consultant Principal Acoustical Consultant
<br />Acoustical Analysis Report for 4th and Mortimer • Job # S220404 • July 18, 2022 Page 17
<br />Eilar Associates, Inc.
<br />Acoustical and Environmental Consulting Services
<br />Concrete Shear Wall
<br />In some locations where residential units are located adjacent to one another or common space, the following
<br />assembly is proposed:
<br />• 8-inch (minimum) thickness concrete
<br />A laboratorySTC test of this assembly was conducted b Riverbank Acoustical Laboratories (Catalog section
<br />Y Y ( g
<br />number 2.3.2.1.1.2) and achieved an STC rating of 58, which meets the California Building Code requirement
<br />for a minimum STC rating of 50.
<br />Floor/Ceiling Assemblies
<br />Concrete Slab Floor/Ceiling Assembly (17/AD 21)
<br />The concrete slab floor/ceiling assembly is proposed to be constructed as follows:
<br />• Carpet and pad OR hard surface finish flooring
<br />• 8-inch minimum thickness concrete slab
<br />According to Catalog section number 2.3.2.1.1.2, the bare concrete assembly is expected to have an STC rating
<br />of 58. According to Catalog section number 2.3.1.1.2.1, the IIC rating of a five inch thick concrete slab with a
<br />floor covering of carpet and pad is IIC 70. Therefore, with a floor covering of carpet and pad, the anticipated
<br />IIC rating of the above assembly is expected to be greater than 70; however, in areas with hard surface flooring,
<br />an acoustical underlayment and/or dropped ceiling is required. As the STC rating of the bare slab assembly
<br />meets the California Building Code minimum, neither a floor covering, acoustical underlayment, nor a dropped
<br />ceiling is required at areas over nonresidential space (such as the retail or restaurant spaces). However, in areas
<br />over residential space, the concrete slab floor/ceiling assembly should be improved using one of the following
<br />assemblies:
<br />Option 1: Improved Concrete Slab Floor/Ceiling Assembly avith Dropped Ceiling
<br />• Hard surface finish flooring
<br />• Single layer of 2 mm thick acoustical underlayment, such as GenieMat RST02, Ecore
<br />QTscu 4002, or equivalent (not required over nonresidential space or where carpet and
<br />pad are installed)
<br />• 8-inch minimum thickness concrete slab
<br />• Single layer of 5/8-inch thick gypsum board suspended from the underside of the slab
<br />A similar assembly was tested by Intertek with engineered wood flooring. The tested assembly
<br />(Intertek Test No. F1751.07-113-11-RO) achieved an IIC rating of 67. The differences between the
<br />tested and proposed assemblies are that the tested assembly incorporates a 6-inch-thick concrete slab,
<br />while the proposed assembly incorporates an 8-inch-thick concrete slab, and the tested assembly
<br />incorporates a 5 mm thick GenieMat RST05 (equivalent to Ecore QTscu4005) underlayment, while
<br />the proposed assembly incorporates a 2 min thick GenieMat RST02 (equivalent to Ecore QTscu4002)
<br />underlayment. The increased slab thickness is expected to result in an increase of approximately 2 to
<br />4 IIC points, while the use of a thinner underlayment is expected to result in a decrease of
<br />approximately 1 to 2 IIC points. For this reason, the anticipated IIC rating of the improved concrete
<br />floor/ceiling assembly would be at least IIC 67. The concrete floor -ceiling assembly as detailed above
<br />is expected to meet the minimum building code requirements with any hard surface floor covering
<br />with this 2 min thick acoustical underlayment in place.
<br />Acoustical Analysis Report for 4th and Mortimer • Job # S220404 • July 18, 2022 Page 14
<br />Eilar Associates, Inc.
<br />Acoustical and Environmental Consulting Services
<br />Option 2: Improved Concrete Slab Floor/Ceiling Assembly wthoutDropped Ceikng
<br />• Hard surface finish flooring
<br />• Single layer of 5 mm thick acoustical underlayment, such as GenieMat RST05, Ecore
<br />QTscu 4005, or equivalent (not required over nonresidential space or where carpet and
<br />pad are installed)
<br />• 8-inch minimum thickness concrete slab
<br />This assembly was tested by NGC Testing Services with ceramic tile flooring. The tested assembly
<br />(NGC Report No. 7013106) achieved an IIC rating of 50. The concrete floor -ceiling assembly as
<br />detailed above is expected to meet the minimum building code requirements with any hard surface
<br />floor covering with this 5 mm thick acoustical underlayment in place.
<br />Wood -Framed One Hour Floor/CeikngAssembly (1/AD-21)
<br />The wood -framed floor/ceiling assembly between stacked units should be constructed as follows:
<br />• Carpet and pad OR hard surface finish flooring
<br />• 1-inch-thick gypsum concrete topping
<br />• Single layer of Acousti-Mat 1/4 floor underlayment (not required in carpeted areas)
<br />• Single layer plywood
<br />• 2-inch by 10-inch dimensional wood joists
<br />• Fiberglass batt insulation in cavity
<br />• Single layer of 5/8-inch-thick Type X gypsum board, attached to the joists using single -leg resilient
<br />channels
<br />A laboratory STC test was conducted by Intertek (report number I0112.20-113-11-RO) for this assembly. The
<br />tested assembly achieved an STC rating of 57, which exceeds the minimum required rating of STC 50 required
<br />by the California Building Code. This rating applies to the assembly regardless of floor finish.
<br />A laboratory IIC test of a similar assembly with a floor covering of carpet and pad was conducted by Geiger
<br />and Hamme (Catalog section number 2.1.4.2.1.5) and achieved an IIC rating of 79. The laboratory -tested
<br />assembly differs from the proposed assembly in that the tested assembly incorporated a slightly thicker layer of
<br />lightweight concrete; however, the slight decrease in thickness of gypsum concrete is not expected to
<br />significantly affect the IIC rating of the assembly. Therefore, the IIC rating of the proposed assembly with
<br />carpet flooring is expected to exceed the minimum required rating of IIC 50 required by the California Building
<br />Code. Additionally, it should be noted that the tested assembly did not include the additional benefit of the
<br />Acousti-Mat underlayment. For this reason, the Acousti-Mat 1 /4 underlayment is not required in carpeted
<br />areas. Although not required beneath areas with a floor covering carpet and pad, it is the recommendation of
<br />the undersigned that the Maxxon Acousti-Mat 1 /4 underlayment be incorporated in all areas, to better ensure
<br />that future notential alterations to floor coverings (such as renlacine cametinLr with hard surface floorhw) will
<br />still meet California Building Code impact noise rating requirements.
<br />The above wood floor/ceiling assembly was tested for impact sound transmission at Intertek Acoustical
<br />Laboratories with floor coverings of either sheet vinyl, vinyl plank, ceramic tile, or engineered hardwood
<br />flooring (report numbers I0112.20-113-11-RO, I0112.19-113-11-RO, I0112.24-113-11-RO, and I0112.21-113-11-
<br />R0, respectively). The tested assembly achieved an IIC rating of 51 with a sheet vinyl floor covering, 51 with a
<br />vinyl plank floor covering, 52 with a ceramic tile floor covering, and 51 with an engineered hardwood floor
<br />covering. These ratings meet the standards of the California Building Code.
<br />Acoustical Analysis Report for 4th and Mortimer • Job # S220404 • July 18, 2022 Page 15
<br />Architecture + Planning
<br />17911 Von Karman Ave.
<br />Suite 200
<br />Irvine, CA 92614
<br />ktgy.com
<br />949.851.2133
<br />KTGY Project No: 2017-0934
<br />Project Contact: Debbie Holland
<br />Email: dholland@ktgy.com
<br />Principal: Wil Wong
<br />Project Designer: D. Schoolmeester
<br />Project Director: Debbie Holland
<br />Developer
<br />E I] Q A K
<br />NVL- STMENI'S
<br />4199 CAMPUS DRIVE
<br />I RVI N E, CA 92612
<br />PHONE NO. (714) 342-2502
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<br />It is the clients responsibility prior to or during construction to notify the architect in writing
<br />of any perceived errors or omissions in the plans and specifications of which a contractor
<br />thoroughly knowledgeable with the building codes and methods of construction should
<br />reasonably be aware. Written instructions addressing such perceived errors or omissions
<br />shall be received from the architect prior to the client or clients subcontractors proceeding
<br />do
<br />with the work. The client will be responsible for any defects in construction if these
<br />procedures are not followed.
<br />�, J
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<br />G��SED
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<br />No. C29795 *
<br />C)
<br />RENEWAL DATE
<br />AUGUST 31, 2023
<br />1
<br />9jF OF
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<br />CA��
<br />License Stamp
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<br />EXTERIOR
<br />ACOUSTICAL
<br />ANALYSIS REPORT
<br />COPYRIGHT n
<br />AO-93
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