HomeMy WebLinkAbout02-17-2015 PH1 GarciaSubject: FW: Peer review of Dubbink Noise Study - The Monterey Hotel
Attachments: Peer Review Noise Update Dr Lord.pdf
COUNCIL MEETING:
ITEM NO, P4;
From: George Garcia Finailto :george @garciaarchdesign.com]
Sent: Tuesday, February 17, 2015 4:07 PM
To: Marx, Jan; Ashbaugh, John; Carpenter, Dan; Christianson, Carlyn; Rivoire, Dan f I -? j 7 7015
Cc: E -mail Council Website; Carloni, Marcus; Johnson, Derek; Andrew Firestone; Jess Parker
Subject: Peer review of Dubbink Noise Study - The Monterey Hotel
Good afternoon:
I apologies for the lateness of this information, but as you can imagine, we have been scrambling these past few days to
address any and all last minutes comments & concerns from the neighbors regarding the Monterey hotel project. One
item that we have taken a very hard look at is noise. With that in mind, we hired another independent local noise
consultant (David Lord) to not only peer- review our first noise consultant's report (Dr. Dubbink), but to provide analysis
and findings regarding the project revisions that were made as a result of the Planning Commission ruling.
His analysis and findings are attached herewith, and we will be available to answer any questions you may have at this
evenings hearing.
Regards,
George Garcia, AIA, RIBA
garcia arcn:zecture + opsagn
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4 5 d B. c o m P.O. Box 1406
San Luis Obispo
Acoustics Consulting California 93406
DAVID LORD, PH.D.
Principal Consultant
Peer Review and Noise Study Update
17=
Monterey Street Hotel Project
With Parking Garage
San Luis Obispo, CA
Requested by :
Garcia Architecture
San Luis Obispo, CA
tel. 805.704.8046
email: dl@45dB.com
February 13, 2015
Project 1517
This letter describes an updated, limited acoustical analysis of recent specific changes to the
architectural design of the proposed hotel. The design changes are examined with regard to
potential noise emanating from the proposed hotel toward residential sensitive receptors located
to the east.
The previous Acoustic Analysis for the Monterey Hotel, San Luis Obispo, by David Dubbink
Associates, October 10, 2014, provides a thorough and comprehensive baseline description and
analysis of potential noise sources from onsite operations and activities. That analysis was based
on an early design of the hotel. Since that report, the changes in the design of the east side of the
building have significantly reduced and attenuated the potential propagation and transmission of
sound toward the east side of the site.
The graphic exhibits that follow describe three scenarios, with sound level contours generated by
acoustical simulation, based on known sources of noise from measurements at nearby and similar
facilities.
Scenario 1 is a noise level portrait of the surrounding neighborhood and the proposed building
site as it exists with NO project. Noise from Monterey Street and Pappy McGregor's outdoor
activity areas and associated parking lot is shown in the diagram as it moves toward the east side
of the site. For a visual comparison, sound level contours from similar uses adjacent to the
proposed hotel are also shown for reference. Assumptions made for noise sources are based on a
composite of moderate to heavy patronage of all of the nearby hospitality and entertainment
facilities as well as busy vehicular traffic along Monterey Street. Outdoor activity areas are
assumed to be fully populated, with swimming pools active, pumps, compressors, deliveries
being made, etc. Windows of the proposed hotel are assumed to be open with the sound of
voices coming from inside and at the window opening. Balconies and windows of nearby hotels
and other facilities are assumed to be in use. In this scenario, parking lots are actively used, with
vehicles arriving and departing.
Scenario 2 is the same noise level portrait as above with the following exception: The parking
area east of Pappy McGregor's has been removed and the proposed hotel has been inserted onto
page I of 3 45dB.com tel: 805.704.8046
the site. It is assumed that multiple windows facing the east are fully open and there is a sound
of simultaneous potential voices at the windows in locations on the south wing and the north
wing of the hotel.
Scenario 3 The Level One parking garage is assumed to have a sound absorbing ceiling for
attenuating potential noise passing from within the parking garage and from the west side of the
hotel. The floor of the parking garage is assumed to have a rough texture to minimize tire noise
and to absorb sound better than a polished, hard concrete surface.
Scenario 1, Existing site with NO hotel
page 2 of 45dB.com tel: 805.704.8046
Scenario 2, WITH hotel: same noise from Monterey St. and McGregor's with no parking lot.
Nothing else is changed from Scenario 1, except insertion of the hotel which becomes a "noise
barrier." The outdoor activity area near Pappy McGregor's is more acoustically prominent
because noise from the former parking area has been left out.
Scenario 3 is shown on the following page. The propagation of sound is described in section
through the hotel and parking garage toward the east side. It should be noted that sound level at
6 feet above the ground is attenuated toward the east because of the topography. The east side
lies at a lower elevation than the source of sound.
page 3 of 3 45dB.com tel: 805.704.8046