HomeMy WebLinkAboutEx_07_Acoustical_Report
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.
Exhibit 7
RECEIVED
02/16/2024
AMorganroth
PLANNING DIVISION
Docusign Envelope ID: A830AE25-EBFC-4E86-B4AB-7D0B0E992C30
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. Persons
wishing to use or rely upon this report for other purposes must seek written authority to do so from the owner of this report 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 commissioned. 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.
Docusign Envelope ID: A830AE25-EBFC-4E86-B4AB-7D0B0E992C30