HomeMy WebLinkAbout6.UP23-0010 Noise Study 9.21.23
REPORT PREPARED FOR:
EC Telecom c/o Harmoni Towers
Attn: Angela McDonald
Phone: (916) 918-9344
Email: angela.mcdonald27@t-mobile.com
Report Delivery Date: September 21, 2023
REPORT DELIVERED BY:
Jared Kearsley
Sound Solutions
SoundSolutions916@gmail.com
Phone: (209) 968-4315
HARMONI TOWERS ACOUSTIC ANALYSIS – CA0003502 T-MOBILE SITE SC06543A
1 Harmoni Towers CA0003502 / T-Mobile Site SC06543A Acoustic Analysis
September 21, 2023
Contents
Contents ......................................................................... 1
Executive Summary ........................................................ 2
Acoustic Criteria ............................................................. 2
Proposed Project Description ......................................... 4
Noise Analysis ................................................................. 6
Generator Findings ……………………………………………………. 6
Methodology .................................................................. 7
Conclusion ..................................................................... 7
2 Harmoni Towers CA0003502 / T-Mobile Site SC06543A Acoustic Analysis
September 21, 2023
Executive Summary
DATE: September 21, 2023
TO: Angela McDonald
EMAIL: angela.mcdonald27@t-mobile.com
FROM: Jared Kearsley
SUBJECT: Acoustic Analysis
Harmoni Towers Site: CA0003502
T-MOBILE SITE: SC06543A / Tuft Oroville
Dear Angela McDonald,
We have reviewed plans and equipment
noise data related to the proposed
installation of a generator at 1527 16th
Street, Oroville, CA 95965 (APN: 030-110-
081-000) and have completed our review
of projected noise emissions relative to
applicable noise limits established by Butte
County.
1.0 ACOUSTIC CRITERIA
(a)
The following noise standards, unless
otherwise specifically indicated in this chapter, shall apply to all noise sensitive exterior
areas within Butte County.
Daytime (7 a.m. to 7
p.m.)
Evening (7 p.m. to 10
p.m.)
Nighttime (10 p.m. to 7
a.m.)
Designation
Noise Level
Descriptor
Urban Non-Urban Urban Non-Urban Urban Non-Urban
Hourly Average
(L eq )
55 50 50 45 45 40
Maximum (L max ) 70 60 60 55 55 50
3 Harmoni Towers CA0003502 / T-Mobile Site SC06543A Acoustic Analysis
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(b)
It is unlawful for any person at any location within the County to create any noise which
causes the noise levels on an affected property, when measured in the designated
exterior location, to exceed the noise standards specified above.
(c)
Each of the noise limits specified in subdivision (a) of this section shall be reduced by five
(5) dBA for recurring impulsive noise, simple or pure tone noise, or for noises consisting
of speech or music.
(d)
Noise level standards, which are up to five (5) dBA less than those specified above, based
upon determination of existing low ambient noise levels in the vicinity of the project site
may be imposed.
(e)
In urban areas, the exterior noise level standard shall be applied to the property line of
the receiving property. In non-urban areas, the exterior noise level standard shall be
applied at a point one hundred (100) feet away from the residence or at the property line
if the residence is closer than one hundred (100) feet. The above standards shall be
measured only on property containing a noise sensitive land use.
(Ord. No. 4053, § 1, 3-26-13)
INTENTIONALLY LEFT BLANK
4 Harmoni Towers CA0003502 / T-Mobile Site SC06543A Acoustic Analysis
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2.0 PROPOSED PROJECT DESCRIPTION
The subject Harmoni Towers and T-Mobile project comprises of a new Wireless
Telecommunications Facility (WTF) that includes a new 25KW SD025 Generac
standby generator inside the proposed Wireless Communication Facility (WTF).
The purpose of the 25KW emergency generator is to backup T-Mobile’s
equipment when power is lost.
Figure 1 – Project Area
N
5 Harmoni Towers CA0003502 / T-Mobile Site SC06543A Acoustic Analysis
September 21, 2023
Based on a review of the overall site plan and surrounding area, we have identified the
nearest dwellings from the generator. The two nearest dwellings are located to the north
approximately 475 feet and 415 feet from the generator. Per the County’s Noise
Ordinance, the calculations will be 100 feet from the two dwellings – 375 feet and 315
feet respectively.
• Northwest dwelling calculated distance – 375’
o Northwest Property’s Parcel Number: 030-110-082
• Northern dwelling calculated distance – 315’
o Northern Property’s Parcel Number: 030-110-080
The project layout is shown in Figure 2, below. Of the equipment shown, we have
identified that the proposed standby generator is the only noise source of concerns
associated with the project.
Figure 2 – Project Layout
6 Harmoni Towers CA0003502 / T-Mobile Site SC06543A Acoustic Analysis
September 21, 2023
3.0 NOISE ANALYSIS
3.1 GENERATOR FINDINGS
The generator has been identified as a Generac SD025 Diesel fueled
generator rated for 25KW of standby power. The generator has been
specified with the manufacturer’s Level-2 acoustic enclosure which is rated
for a sound pressure level of 65 dBA at a distance of 7 meters (23 feet)
while running under a full load.
The project site plan indicates that the installation is located in a nonurban
area of Butte County, therefore, nonurban noise limits apply to the project.
Table 1 – Generator Noise Projections
Receptor
Maximum Leq (dBa)
Projected
Limit
Nearest Dwelling
to the northwest
– 475’ (375’)
40.75
60
Nearest Dwelling
to the North –
415’ (315’)
42.27
60
Noise emissions from the Generator are anticipated to meet the nonurban
maximum noise level 100 feet from the two nearest dwellings.
7 Harmoni Towers CA0003502 / T-Mobile Site SC06543A Acoustic Analysis
September 21, 2023
4.0 METHODOLOGY
The acoustic analysis methods and results are theoretical only, using sound
pressure and distance calculations. These calculations do not take outside sounds,
trees, hills, buildings, and other sound dampening variables into consideration,
but, only raw sound pressures after specific traveled distances which result in the
worst-case scenario for the sound pressure of the proposed backup generator.
7.0 CONCLUSION
Based on the project documentation, our noise analysis indicates that the 25kw Diesel
Generator owned by T-Mobile will not exceed Butte County’s noise ordinance standards.
It is also worth noting that the generator will be used during emergency power outages
and also will run for 15 minutes a week for routine maintenance purposes during regular
business hours.
Please feel free to call or email if you have any questions. We may be reached by
telephone at (209) 968-4315 or by email at: SoundSolutions916@gmail.com.
Sincerely,
Jared Kearsley
Sound Solutions