07/2398 - Revised Noise Report and cover letters to referral agencies [As Published] · 132007.2398

RSL Care =
Proposed RSL Retirement Village, Cooroy - Road and Rail Noise Assessment (Revised) —

 

7 CONCLUSION
7.1 RAIL NOISE

Impacts of noise associated with the Cooroy Railway Corridor have been investigated by the
assessment of unattended and attended noise monitoring data completed at the proposed
development site. Based on the noise monitoring results, it is predicted that train noise levels
passing by the proposed retirement village will exceed the relevant internal Lama noise criterion by
up to 40 dB(A).

Compliance with the internal noise criteria is likely to be achieved provided the following mitigation
options are implemented:

® an acoustic barrier is constructed at the boundary of the devetopment site along the Cooroy
Connection Road (as shown on Figure 8). The acoustic barrier should have a mass density of
12 kg/m? and be continuous with no air gaps;

= all rooms requiring a noise reduction of greater than 10 dB (as identified on Tables 5.5 and 5.6)
should be provided with air-conditioning; and

= the Care Facility, Apartment and Village centre should be constructed of materials which meet
the required STCs as specified in Tables 5.8.

Based on the predicted noise levels and proposed tayouts, STC requirements for a number of (LU
windows are predicted to be above 40 (as shown in Table 5.7). In order to reduce the STC
requirements for [LU buildings to those presented in Tables 5.9 and 5.10, the following options
should be considered:

= replace ILU Buildings 3, 4, 30 with Type 1 ILU layouts;

= construction of ILU Buildings 93, 95, 96, 98 to 100, 102, 103, 106, 109 to 115 and 117 with an
alternative layout as presented on Figure 9;

= for the alternative design, an acoustic barrier extending at least 1 metre from the Bedroom 2
wall should be constructed. The barrier should be 1.8 m above the finished floor level and be
located adjacent to the Bedroom 2 window (see Figure 9); and

= replace Type 4 double unit ILU Buildings 94, 97, 101, 104, 105, 107, 108, 116 and 118 with an
alternative design. Bedroom areas should be provided furthest from the Cooroy Connection
Road. This is likely to involve the provision of living areas to the rear of the ILU building.

Currently, no alternative layouts have been made available to replace the Type 4 double units
(Buildings 94, 97, 101, 104, 105, 107, 108, 116 and 118) located near the Cooroy Connection
Road. If double units are provided by combining two mirrored alternative single units, window STC
values of 37 are likely be achieved for these buildings. However, if alternative designs to those
presented in Figure 9 are proposed, an acoustic assessment of these units would be required to
determine the required construction materials.

 

AIR NOISE ENVIRONMENT PTY LTD
INETWORK/PROJECTS/1750/REPORTING/2008 REVISION/1750REPORT04.0DT Page 47