Noise Report [As Published] · 132007.2398

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ASL Care ==
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Proposed RSL Retirement Village, Cooroy — Road and Rail Noise Assessment

 

dB(A) '“ Predicted Noise Levels
85 67.0
86 66.0
87 65.8
88 66.2
89 62.3
90 60.7
91 59.9
92 57.5
93 56.4
94 56.3
95 54.9
96 53.2
C1 (Ground 63.5
C2 (First 68.7
A1 (Ground 54.0
Ail (First 55.8
A2 (Ground 65.6
A2 (First 71.7

v4 54.6

. 2 a summary receptor to .
2. Levels shown in bold represent exceedences of the appropriate noise criteria (57 dB(A) free field).

       

As identified on Table 4.4, the construction of a 2.5 m acoustic barrier is predicted to reduce
noise levels at the proposed site by up to 9.1 dB(A) (Receptor 17). Compliance is predicted at
41 out of the 101 receptor positions (compared to 30 receptor positions without the acoustic
barrier).

Figures 4 to 8 present predicted noise contours for ground floor open space at ILUs closest to
the Cooroy Connection Road. As identified on these figures, areas of compliance are located
in the shadow zone of the buildings.

Section 4.6.3 discusses potential construction materials for buildings situated in areas which
still exceed the DMR criterion with the barrier in place.

4.6.3 Alternate Construction Materials

The following section discusses the construction material requirements necessary for 2.5 m
acoustic barrier, as described in Section 4.6.2, has been taken into account in determining the
necessary facade treatments.

AS 3671 — 1989 Road Traffic Noise Intrusion — Building Siting and Construction defines the
Traffic Noise Reduction (TNR) as the traffic noise exposure level (Laer) minus the
satisfactory internal noise level (Larec). Typically a 3 dB(A) reduction is applied to Laio noise
levels predicted in the modelling to approximate to Lac. As the external traffic noise
predictions generated estimated free-field noise levels a correction to these levels must first
be made to predict facade noise levels. Typically a +2.5 dB(A) correction is applied to free-
field noise levels to approximate to facade levels.

 

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