J Acoustic Report · 132007.2398

                                                                                       ACOUSTICS & AIR QUALITY

9   Recommendations & Conclusion

A road and rail noise assessment has been conducted for the proposed retirement community
and aged care facility at Trading Post Road, Cooroy. The results and recommendations of the
assessment are as follows:
       A noise barrier is proposed for the roadside boundary as shown in Figure 6.1. The
        barrier is modelled as 2.0 metres to 3.5 metres high based on the proposed ground
        levels provided to ASK. It is noted that the proposed noise barrier is very long and
        relatively high for what appears to be a road carrying only minor to moderate traffic
        volumes. This is due in part to the strict noise criterion being a quiet area, and the
        undulating terrain. It is noted that in the previous ASK noise report for this site, the
        barrier height was restricted to 2.1m, resulting in higher noise exposures at dwellings
        but accommodating this through more significant acoustic upgrades for the dwellings. It
        is likely that any relaxation of the barrier height would require acceptance from TMR and
        Council.
       To achieve the target noise reductions from external noise to internal noise levels in
        MP4.4 will require the construction details are of an appropriate acoustic standard, and
        that all external openings to be closed when these habitable rooms are occupied. The
        required noise categories for all allotments and aged care home facades are included in
        Table D.1, including the effect of the proposed noise barrier. The construction
        requirements associated with these noise categories are included in Appendix E.
       To achieve the target noise reductions from external noise to internal noise levels in
        MP4.4 will require the construction details are of an appropriate acoustic standard, and
        that all external openings to be closed when these habitable rooms are occupied.
        Therefore, an air-conditioning/mechanical ventilation system that does not degrade the
        internal acoustic environment or the sound isolation of the building envelope, and also
        meets the ventilation requirements of the Building Code of Australia may need to be
        installed.


Compliance with the above recommendations is predicted to result in compliance with relevant
noise criteria.




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