HomeMy WebLinkAbout12 - Attachment CC7Attachment No. CC 7
Vista Environmental Noise Analysis
177
172
VISTA ENVIRONMENTAL
March 3, 2011
Stephen Sheldon
Sheldon Group
901 Dove Street, Suite 140
Newport Beach, CA 92660
SUBJECT: MALARKY'S IRISH PUB NEW OUTDOOR PATIO AREA NOISE
ANALYSIS.
Dear Mr. Sheldon:
This letter analyzes the potential noise impacts to the nearby residences from the Malarky's Irish
Pub Remodel, which includes a new 782 square foot outdoor patio area. The proposed outdoor
dining area would be located on the north side of the existing structure and would be surrounded
by a 4 -foot high stucco wall with a 5 -foot 8 -inch glass wall on top of the stucco wall, for a total
wall height of 9 feet 8 inches.
The City of Newport Beach has established performance standards identified in Section
10.26.025 of the Municipal Code to control stationary source /non - transportation related noise
impacts, which includes noise from outdoor patio areas. For noise impacts onto residential areas,
the standards establish maximum allowable exterior noise levels for stationary noise when
measured on the property line of any residential property is 55 dBA Lett during the daytime (7
a.m. to 10 p.m.) and 50 dBA Leq during the nighttime (10 p.m. to 7 a.m.). If the ambient noise
level exceeds the above standards than the ambient noise level becomes the standard.
The location of the nearest residences to the new outdoor patio area are shown in Figure 1.
Figure 1 also provides the distances in feet between the residences and the new outdoor patio
area as well as the locations of the noise measurements. Table A below provides the results of
the noise measurements.
Table A
Site Receptor Location Duration (min) Leq Lmax
A At Proposed Outdoor Patio Area 15 63.5 77.1
B At SE corner of 217 30th Street 15 53.5 70.7
C At rear parking spot of 403 30`" Street 10 59.3 70.3
Notes: Noise measurements taken on March 3, 201 I.
Source: Larson -Davis Model 824 Tvne 1 precision sound level meter.
Page 1 OF 3
1021 DIDRIKSON WAY
LAGUNA BEACH CALIFORNIA 92651
PHONE 949 510 5355
FACSIMILE 949 715 3629
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LEGEND
A Noise Measurement Location
Figure 1
Site Location and Study Area
120
Table A above shows that all noise measurements currently exceed the City's nighttime noise
standard of 50 dBA Leq and Sites A and C also exceed the City's daytime noise standard of 55
dBA Leq.
In order to determine the noise impacts of the new outdoor patio area a reference noise
measurement was taken at the edge of an existing outdoor patio area during lunchtime on a
Saturday. The reference noise measurement recorded noise levels of 62.6 dBA Leq and 85.5
dBA Lmax. In order to calculate the noise levels at the nearby residences, a version of the
FHWA -RD -77 -108 model was used and was based on a hard site drop -off rate of 6 db per
doubling of the reference distance. The results of the calculated noise levels are shown below in
Attachment A. Attachment A shows that the noise level will range from 8.5 to 16.8 dBA Leq
without construction of the perimeter wall and would be from 0 to 1.9 dB Leq with construction
of the wall.
Please call me at (949) 510 -5355 if you have any questions related to the above.
Sincerely,
Greg Tonkovich
Senior Analyst
Vista Environmental
PAGE 3 of 3
VISTA EWIRONMENTAL
1021 DIDRIKSON WAY
LAGUNA BEACH CALIFORNIA 92651
PHONE 949 510 5355
FACSIMILE 949 715 3629
ELECTRONIC GREG@VISTALB.COM
121
Stationary Noise Calculations for the Outdoor Patio Area
Stationary Reference
Receptor Location Distance Leq Lmax Distance Leq Lmax 2 (Line source hard =0, soft=.5, Point source hard =2, soft =2.5)
1217 30th Street
5 II 62.6 85.5 '
314
8.7
31.6 (eq. N- 2141.2 of TeNS)
40330th Street
D -� 62.6 85.5
_
168
16.8
39.7
MP Marc Avenue
_
5 62.6 SS.S
�r-
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318
8.5
31.4
Leq
y�
a
Distance
Distance
Without
With Wall
source to
Exterior
difference
line of
source to
from
from
Height
Wall Noise
Noise Level
Source
Observer
Source
barrier to
(auto)
Recptor to
source
of Wall
Level at
at
Height
Height
Frequenc
receiver - b
Noise Source
Wall
to Wall
(feet)
Residence
Residence
(feet)
(feet)
y (hz)
(all)
217 30th Street
309
5 9.5
8.7
-6.2
5
5
700
309.0328
403 30th Street
163
5 9.5
16.8
1.9
5
5
700
163.0621
Marcus Avenue
313
5 9.5
8.5
-6.4
5
5
700
313.0323
Lrnax
Distance
Distance
from
Without
With Wall
Exterior
from
source
Height
Wall Noise
Noise Level
Source
Observer
Source
barrier to
Recptor to
to Wall
of Wall
Level at
at
Height
Height
Frequenc
receiver - b
Noise Source
Wall
(feet)
(feet)
Residence
Residence
(feet)
(feet)
y (hz)
(all)
217 30th Street
309
5 9.5
31.6
16.7
5
5
700
309.0328
403 30th Street
163
5 9.5
39.7
24.8
5
5
700
163.0621
Marcus Avenue
313
5 9.5
31A
16.5
5
5
700
313.0323
y�
a
path
source to
source to
difference
line of
source to
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source to
receiver-
y =a +b -c
sight
c
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barrier - a
c
(auto)
(slope)
fresnel
Atten
6.726812
314
1.7596
1
4.37939
- 14.859
6.726812
168
1.7889
1
4.45242
- 14.915
6.726812
318
1.7592
1
4.37835
- 14.859
path
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difference
line of
source to
receiver -
y =a +b -c
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6.726812
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6.726812
318
1.7592
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4.37835 - 14.859