07/2398 - Request for information response [As Published] · 132007.2398

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6.4 Road Traffic Noise Predictions

Preliminary noise modelling indicated that since the central section of the subject site was elevated,
there would be difficulty in shielding the traffic on the Cooroy Connection Road without a significantly
high noise barrier located on the boundary of the subject site with the Cooroy Connection Road
coridor. This means that the external DMR noise limit of 60 dB(A) would be difficult to meet.

The basis of the road traffic noise assessment is therefore that the external noise limit would be met
for all residential units located in the first row facing the road at the northern and southern ends of
the subject site, but that this limit would not be met at the first row of units located near the elevated
centre of the subject site. For all other units the external noise limit would be met.

As a result a 2.1m high acoustic barrier along the Cooroy Connection Road boundary has been
modelled. In addition a 2.0 m high acoustic barrier is required on the northern side of the subject site.
The required acoustic barriers are shown in Figure 3.1.

The 2019 road traffic noise levels have been predicted for the proposed residential dwellings, ===>
Appendix A shows the predicted Li0(|8hour) traffic noise levels Im from the facades of the ,
proposed rooms. The predicted road traffic noise levels include a plus 2.5 dB(A) facade correction |
allowance. "

From the measured results it is assumed that the 2019 maximum Leq(Ihour) day and maximum ~
Leq(Ihour) night are the predicted 2019 L10(!8hour) plus the difference between the measured
Lio(ihour) maximum noise level and the measured maximum Leq(Ihour) day and maximum .
Leq(!hour) night. ~—seeii a

6.5 Discussion

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The external L!0(| 8hour) noise limit is predicted to be exceeded at units 15-29, 31-33, 36, 37 and
39.

According to the DMR Code of Practice, for these units the AS2107 intemal noise limits are to be é
met. This is discussed in Section 8.

In terms of formal external open space, the road traffic noise level predictions shown in Appendix A
would be applicable at the side of the residence facing Cooroy Connection Road, with lower noise oe
levels applying at the other facades.

The noise limit of 63 dB(A) LI10(18hour) is predicted to be exceeded by | dB(A) at the side facing
the road at units 16, 17, 19-21, 23, 25, and 28. For these units formal external open space is provided
at the front facade, ie. away from Cooroy Connection Road.

As a result the formal open space noise limit would be met at all units.

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