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p) 206.378.0569 f) 206.378-0641 www.greenbusch.com
1900 West Nickerson Street, Suite 201 Seattle, WA 98
119 DATE:
August
11, 2016
TO: Susan Gemmill
Carillon Properties
FROM:
Adam C. Jenkins, PE(OR), INCE Bd. Cert.
RE: Seaplane Scenics
Noise Measurements
Transmitted by:
Delivery
Fax E-mail
Susan:
The intent of this memorandum is to present the results of noise measurements of seaplane
operations conducted during the day on July 28, 2016, to fulfill conditional use permit
application requirements for the City of Kirkland.
Results
Normal seaplane operations recorded from three locations surrounding the Carillon property
generated a maximum of 62 dBA (LAFmax)
. Figures 1 and 2 show seaplane activity
measured over time, including other ambient noise events during the operation periods. The
seaplane was most audible from the northern end of the property (Figure 1), barely audible
from the southern end (Figure 2), and inaudible adjacent to Lake Washington Blvd. Tables
2 and 3 summarize measured sound levels during periods of seaplane operation.
It should be noted that an engine backfire was measured at 77 dBA before takeoff at the
northern monitoring location, however, it is our understanding that this event is very rare, so
it was excluded from our assessment of typical operations.
Definitions
A-weighted Decibel, dBA
The human ear has a unique response to sound pressure. It is less sensitive to those
sounds falling outside the speech frequency range. Sound level meters utilize a filtering
system to approximate human perception of sound. Measurements made utilizing this
Maximum Sound Level, L
AFmax
LAFmax
is the maximum recorded root mean square (rms) A-weighted sound level for a given
time interva
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