HomeMy WebLinkAbout901 W Civic Center Dr - Misc. Permit7U2s/2020 NOISE STUDY
Evoluotion of Complionce with City ol Sonto Ano Noise Ordinonce
Study Conducted and Report Composed by:
John Matagos
Senior Acoustical EnBineer, Noise & Vibration Consultant
Masters in Acoustical Engineering (MEng with Honors)
University of Southampton - l.S.V.R
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Acoust
JPM
ics Noise V ibration
17.25.2020
Dear Mr. Tony Bolbolian,
On 11.25.2020, Noise Level measurements were conducted in order to evaluate compliance with
the City of Santa Ana Municipal code Sec. 18-312. - Exterior Noise Standards.
This was in relation to noise levels generated by the HVAC tower/s located at 901 W. Civic Centre
Drive, Santa Ana, CA 92703.
This study is focused on evaluating noise level com pliance in the near vicinity of the cooling tower
mechanical equipment (HVAC). That is, residential locations in the cul de sac vicinity of North Olive Street.
During the day of measurements, a noise wall/noise barrier was already constructed. The wall is
blocking line of sight of HVAC louvers with adjacent residential properties, per previous noise control
design docu ment/s.
Email: contact@acousticalnoisevibration.com
Tel: (+1) 213 909 5375
3003 W. Olympic Blvd H106, Los Angele5, CA 90006 2
Acoust
JPM
ics Noise Vibration
1.0 MEASUREMENTS
Noise monitoring equipment used was a noise level meter by 3M, Soundpro DL, professional
grade sound level meter. All data obtained are A-weighted, with slow response setting, and 3dB exchange
rate.
Short duration measurements with l-second logging were conducted at various positions along
the shared property line of interest. Figure A.1 to A.3, in APPENDIX - A, illustrate positions of each noise
level measurement taken, as well as property line of interest, noise source under study, residential
property evaluated, and position of existing noise wall.
Additionally, Figures A.4 to A.14, in APPENDIX - A, illustrate graphically the individual noise level
data obtained in 1-second logging, with the noise source under investigation operating.
Emailr contact@acou5tiaalnoisevibration.com
Teli (+1) 213 909 5375
3003 W. Olympic Elvd #106, Los An8eles, CA 90006 3
JPM
Acoustius l,loise Vibration
2.0 ANAtYStS
As advised, the HVAC tower is expected to operate during day time hours only. According to the
City of Santa Ana Noise Ordinance, included in APPENDIX - B, by the end of this report, maximum
allowable exterior noise limit is tAeq,lhr - 55 dB(A).
The HVAC tower operates continuously with a relatively steady noise level. Various background
noise events occurred during noise level measurements.
Measurements were conducted during daytime hours between 1pm and 6pm, on 71.25.2020.
During the measurements there were several background noise levels such as gardening operations by
neighbors, airplanes, helicopters, loud music, cars parking etc. The moments of lowest levels measured
are the values that indicate HVAC operation noise levels received at positions of interest.
4
Email: contact@aco!sticalnoisevibration.com
Tel: (+1)213 909 5375
3003 W. Olympic Blvd #106, LosAngeles, CA 90005
Acoustic
JPM
s Noise Vihration
CONCLUSION
All noise level measurements conducted, indicate that the noise levels generated by the HVAC
tower/s, are in compliance with the City of Santa Ana Municipal code Sec. 18-312. - Exterior Noise
Standards.
Sincerely,
John Matagos
Senior Acoustical, Noise & Vibration Consultant
Masters in Acoustical Engineering, MEng (Honors) - University of Southampton - l.S.V.R
Emaili contact@acousticalnoisevibration.com
Tel: (+1)213 909 5375
3003 W. Olympic BIvd #106, Lo5 AnSeles, CA 90006
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