Approved report

4 C D Developments
Environmental Traffic and Rail Noise Level Impact Assessment for Proposed Residential Unit Development,
54 Elm Street and 5 Pearl Street, Cooroy                                                                    Page 24 of 35



In accordance with MP4.4 the following minimum Rw values are applicable for each for the above
nominated noise categories, for habitable rooms only:

        Category 0:         no additional acoustic treatment, standard building assessment provisions
                             apply;

        Category 1:         Glazing:        Rw 24 for glazing with up to and equal to 1.8m 2;
                                             Rw 27 for glazing greater than 1.8m 2;
                             External walls: Rw 35;
                             Roof:           Rw 35;
                             Entry Doors:    Rw 28;

        Category 2:         Glazing:        Rw 32 for glazing with up to and equal to 1.8m2;
                                             Rw 35 for glazing greater than 1.8m 2;
                             External walls: Rw 41;
                             Roof:           Rw 38;
                             Floors:         Rw 45;
                             Entry Doors:    Rw 33.


CONCLUSIONS

It is proposed to remove all existing structures from the subject site at 54 Elm Street and 5 Pearl Street,
Cooroy and construct a total of eleven residential units.

Based on the consultant’s site inspection the only potential noise impacts upon the subject site are
traffic noise from Elm Street and rail noise, both of which are State controlled.

Elm Street traffic noise, rail noise and general ambient noise levels were assessed from monitoring
location A, 54 Elm Street, Cooroy, adjacent to the northern boundary with the microphone elevated 1.6
metres and approximately 7.6 metres inside the Elm Street boundary, which is approximately 23 metres
from the centre of traffic on Elm Street and approximately 47 metres to the centre of the railway lines.
Refer Figure 1 for details.

For rail noise the LAeq,24H facade corrected limit of 65 dB(A) is complied with, as well as the single event
maximum rail noise limit, facade corrected, of 87 dB(A). The private external living area rail noise limits
are also complied with. Both of these rail noise limit compliances is achieved with no additional noise
control measures required. Rail noise impact to habitable rooms does require that for some facades of
some of the residential units the materials of construction must be upgraded. Figure 7 details, for rail
noise impact, the required Noise Category for each facade, to achieve compliance with the habitable
room noise limit.

For traffic noise control to the Level 1 facades an acoustic barrier 1.5 metres high on the Elm Street
boundary is required, with 1.5 metre high and 15 metre long returns from the Elm Street boundary (54
Elm Street) east on the southern and northern boundaries. However, to assist with minimising the
minimum Rw requirements for traffic and rail noise control to habitable rooms, this required 1.5 metre
high acoustic barrier will be increased to 2.0 metres in height, for both the barrier on the Elm Street
boundary as well as the 15 metre long returns – refer Figure 7 for details.

For traffic noise control to the closest Level 2 facade to Elm Street a 3.5 metre high acoustic barrier is
required. However, whilst this is what is required to control ultimate traffic noise levels to the upper floor
(level 2) of the proposed residential unit closest to Elm Street, it is considered excessive and
inappropriate for the surrounding rural/residential setting. Alternatively the upper floor could have
upgraded materials of construction to provide adequate traffic noise to inside habitable rooms and the
ground floor traffic noise could be controlled by an acoustic barrier, as detailed above. The materials of
construction for the upper floor would need to achieve the requirements of MP4.4. To comply with the
habitable room noise criteria of MP4.4 all external openings would need to be closed and, therefore, all
upper floor level habitable rooms which require upgraded materials of construction for traffic noise



David Moore & Associates Pty Ltd                                                Our reference: R21046/D3569/Rev.0/2.07.21