Loading...
HomeMy WebLinkAboutCA_NoiseReport_SESEA00218E_231115.pdf November 15, 2023 Allen Koreis Powder River Development Services, LLC 2606 67th Way NW Olympia, WA 98502 Re: Acoustical Report – Dish Wireless SESEA00218E Site: 207 Main Avenue South, Renton, WA 98057 Dear Allen, This report presents a noise survey performed in the immediate vicinity of the proposed Dish Wireless telecommunications facility at 207 Main Avenue S in Renton, Washington. This noise survey extends from the proposed equipment to the nearest properties. The purpose of this report is to document the existing conditions and the impacts of the acoustical changes due to the proposed equipment. This report contains data on the existing and predicted noise environments, impact criteria and an evaluation of the predicted sound levels as they relate to the criteria. Code Requirements The site is located within the City of Renton zoning jurisdiction on property designated with a CD “Center Downtown” zoning and is in mixed residential and commercial use. All the receiving properties are in commercial use. WAC 173-60-030 identifies residential usages as Class A EDNA and commercial usages as Class B EDNA. The proposed new equipment includes equipment support cabinets, which are expected to run 24 hours a day. Renton Municipal Code Chapter 8-7-2 adopts by reference Washington Administrative Code Sections 173-60-020, 030, 040, 050, and 090 Under WAC 173-60-040, noise from equipment on a Class A EDNA property is limited as follows: Class B EDNA Receiver: Noise is limited to 57 dBA 24 hours a day. The equipment cabinets must meet this limit at the commercial receiving property to the west. Ambient Conditions Existing ambient noise levels were measured on site with a Svantek 971 sound level meter on November 14, 2023. Measurements were conducted as close to the proposed location as possible and the property lines in accordance with the State of Washington code for Maximum Environmental Noise Levels WAC 173-60-020. The average ambient noise level was 60 dBA. Dish Wireless Page 2 SESEA00218E Predicted Equipment Sound Levels 24-Hour Operation Equipment The following table presents a summary of the equipment and its associated noise levels: Table 1: Equipment Noise Levels Equipment dBA (each) Quantity Combined dBA @ 5 ft Charles Hex Cube – PM639155N4 65 dBA @ 5 ft 1 65 Total dBA (All cabinets combined) 65 Methods established by AHRI Standard 275-2010 and ASHRAE were used in predicting equipment noise levels to the receiving properties. Application factors such as location, height, and reflective surfaces are accounted for in the calculations. The equipment will be located on the roof of the existing building approximately 70’ above grade surrounded by a stealth enclosure. The nearest receiving property is approximately 30 feet west of the equipment. The following table presents the predicted sound levels at the nearest receiving property: Table 2: Predicted Noise Levels: Proposed Equipment Cabinets Line Application Factor W 1 Sound Pressure Level at 5 ft (dBA), Lp1 65 2 Noise Reduction – Stealth Enclosure & Building Parapet -12 3 Distance Factor (DF) Inverse-Square Law (Free Field): DF = 20*log (d1/d2) -16 (30 ft) 4 New Equipment Sound Pressure Level at Receiver, Lpr (Add lines 1 and 2) 37 As shown in Table 2, the sound pressure level from the proposed equipment is predicted to be 37 dBA at the nearest receiving property to the west, which meets the 57 dBA code limit. Noise levels at other receiving properties, which are further away, will be lower and within code limits. Please contact our office if you have questions or need further information. Sincerely, SSA Acoustics, LLP Reviewed by: Lance Armstrong Steven Hedback Technician Acoustical Consultant This report has been prepared for the titled project or named part thereof and should not be used in whole or part and relied upon for any other project without the written authorization of SSA Acoustics, LLP. SSA Acoustics, LLP accepts no responsibility or liability for the consequences of this document if it is used for a purpose other than that for which it was commissioned. P ersons wishing to use or rely upon this report for other purposes must seek written authority to do so from the owner of this re port and/or SSA Acoustics, LLP and agree to indemnify SSA Acoustics, LLP for any and all resulting loss or damage. SSA Acoustics, LLP accepts no responsibility or liability for this document to any other party other than the person by whom it was commissi oned. The findings and opinions expressed are relevant to the dates of the works and should not be relied upon to represent conditions at substantially later dates. Opinions included therein are based on information gathered during the study and from our experience. If additional information becomes available which may affect our comments, conclusions or recommendations SSA Acoustics, LLP reserves the right to review the information, reassess any new potential concerns and modify our opinions accordingly.