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 20 of 35

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 control must be mechanically ventilated and/or air-conditioned. This air-
conditioning/mechanical ventilation system must be designed and installed such that it maintains the
internal noise and, furthermore, complies with the ventilation requirements of the Building Code of
Australia.


Traffic Noise Control for Habitable Rooms

In accordance with MP4.4 a facade corrected ultimate traffic noise level of ≤ 57 dB(A) LA10,18H means
standard materials of construction, whereas any facade corrected traffic noise level in excess of 57
dB(A) requires upgraded materials of construction to control traffic noise levels to the habitable rooms.

The following Table details the facade corrected traffic noise levels and the corresponding Noise
Category.

                                                Level of transport noise
                                             (LA10,18H) for State controlled     Single event maximum noise
               Noise Category
                                              roads and designated local            (LAmax) for railway land
                                                   government roads
                 Category 4                           ≥ 73 dB(A)                          ≥ 85 dB(A)
                 Category 3                         68 – 72 dB(A)                        80 – 84 dB(A)
                 Category 2                         63 – 67 dB(A)                        75 – 79 dB(A)
                 Category 1                         58 – 62 dB(A)                        70 – 74 dB(A)
                 Category 0                           ≤ 57 dB(A)                          ≤ 69 dB(A)

For the different Noise Categories the required minimum transport noise reduction required for habitable
rooms is as follows:

        Category 4:         40 dB(A);

        Category 3:         35 dB(A);

        Category 2:         30 dB(A);

        Category 1:         25 dB(A);

        Category 0:         No additional acoustic treatment required – standard building assessment
                             provisions apply.

With the acoustic barriers detailed in Figure 7 in place the ultimate facade corrected traffic noise level
has been calculated to each of the facades and the traffic Noise Category determined.

Refer Noise Control section of this report for details of the Noise Category for each facade to
adequately control traffic noise levels to all of the habitable rooms.




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