HomeMy WebLinkAboutNoise Report 821344055CAacousticsin Bun NOwn ISGillil
June 28, 2017
Lori Chase
MG
9725 Third Ave NE, Suite 410
Seattle, WA 98115
Re: Acoustical Report — Verizon WA1 Q Shiner
Site: 1721 Shine Road, Port Ludlow, WA 98365
Dear Lori,
TAV AUG 0 7Mn
JEFFERSON COUNTY DDD
This report presents a noise survey performed in the immediate vicinity of the proposed
Verizon telecommunications facility at 1721 Shine Road in Port Ludlow, 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.
Ambient Conditions
Existing exterior ambient noise levels were measured on site with a Larson -Davis 820 sound level
meter on March 21, 2017. Measurements were conducted on site in accordance with the State
of Washington code for Maximum Environmental Noise Levels WAC 173-60-020. The average
ambient noise level was 50.8 dBA, with traffic noise from nearby State Route 104.
Code Requirements
The site is located within the Jefferson County Zoning jurisdiction on property designated with a
Rural Residential zoning. All of the receiving properties are zoned Rural Residential. WAC 173-
60 identifies all residential properties as Class A EDNA.
The proposed new equipment includes equipment support cabinets and an emergency generator.
The equipment support cabinets are expected to run 24 hours a day. The generator will run once
a week during daytime hours for maintenance and testing purposes only.
According to Jefferson County Code Chapter 18.42.090.1.g noise generated by a wireless facility
shall not exceed the maximum environmental noise levels set forth WAC 173-60. WAC 173-60
limits noise from equipment on a Class A EDNA source property as follows:
Class A EDNA Receiving Property: Noise is limited to 55 dBA between 7:00 am and 10:00 pm,
and 45 dBA between 10:00 pm and 7:00 am.
Additionally, WAC 173-60-040 allows that during any one-hour period, the maximum permissible
noise level may be exceeded by 5 dBA for a 15 minute period.
222 Etiuria Streot, Suite, 100
Seattle, WA 98109
P: 206 839.0819
Verizon
WA1 Q Shiner
Page 2
Therefore, the equipment cabinets must not exceed the 45 dBA nighttime limit. The generator
must not exceed 60 dBA when running during daytime hours for maintenance testing. The
generator is exempt during emergency operation.
Predicted Equipment Sound Levels
24 -Hour Operation Equipment
The following table presents a summary of the equipment and their associated noise levels:
Table 1: Equipment Noise Levels
EquipmentdBA
Commsco a RA84 Power/Batte Cabinet
(each)
65 dBA
5ft
Quantity
2
Combined
68
Dudlik MWE-802830
50 dBA
@ 5ft
1
50
Ericcson RBS 6101 LTE
63 dBA @
3.3ft
2
62
Lucent Modecel 4.013
55 dBA
@ 5ft
2
58
Total dBA All cabinets combined)__69
Add lines 1 and 2
45 36
35
Methods established by ARI 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 at grade surrounded by a chain link fence. The nearest receiving
properties are approximately 75 feet east, 230 feet south and 260 feet west of the equipment.
The following table presents the predicted sound level at the nearest receiving property:
Table 2: Predicted Noise Levels: Proposed Equipment Cabinets
As shown in Table 1, the sound level from the proposed equipment will meet the 45 dBA
nighttime code limit at the nearest receiving property.
ApplicationLine
1
Sound Pressure Level at 5 ft (dBA), Lp1
69 69
69
3
Distance Factor (DF)
-24 -33
-34
Inverse -Square Law Free Field): DF = 20*log d1/d2
74 ft 230 ft
260 ft
4
New Equipment Sound Pressure Level at Receiver, Lpr
Add lines 1 and 2
45 36
35
As shown in Table 1, the sound level from the proposed equipment will meet the 45 dBA
nighttime code limit at the nearest receiving property.
Verizon
WA1 Q Shiner
Emergency Equipment
Page 3
The proposed equipment includes one Generac SD030 30 KW generator with a Level 1 sound
enclosure and has a sound level of 70 dBA at 23 feet. The generator will be located at grade
surrounded by a chain link fence. The nearest receiving properties are approximately 90 feet
east, 230 feet south and 260 feet west of the equipment. The following are the predicted sound
levels at the receiving property:
i apse s: rreatctea noise Levels: rro osea gmerq%ncy
Line Aplatication Factor
venerator
1 Equipment Sound Pressure Level at 23 ft. (dBA), L 1
70 70
70
2 Distance Factor (DF)
-12 -20
-21
Inverse-Sqare Law Free Field): DF = 2010 d1/d2
70 ft 230 ft
260 ft
3 New Equipment Sound Pressure Level at Receiver, L r
58 50
49
As shown in Table 3, the sound pressure level from the generators will meet the 60 dBA code
limit at the nearest receiving properties during test cycle operation.
Please contact us if you have any questions or require further information.
Sincerely,
SSA Acoustics, LLP
I.
.f
Alan Burt, P.E.
PARTNER
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