132003.221132 (23616DA) - Doonella Estate - Road Traffic Noise Assessment Report

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CONSULTING ENGINEERS

6 Discussion of Predicted Noise Levels

As illustrated in Figure 3, the noise level criterion of 60 dB(A) Lio (18 hour) | metre from the building
fagade would be exceeded on the ground floor of residences on allotments 159 — 171, 175 and 177
— 181 of the subject site. The external noise level limit of 60 dB(A) Lio (18 hour) | metre from the
building fagade would be met at all other ground floor residences.

As illustrated in Figure 4, the noise level criterion of 60 dB(A) Lio (18 hour) | metre from the building
facade would be exceeded on the first floor of residences on allotments 159 — 171 and 174 - 181 of
the subject site. The external noise level limit of 60 dB(A) Lio (18 hour) | metre from the building
facade would be met at all other first floor residences. The predicted Lio (18 hour) noise levels for
high set residences on all allotments assume that there are no high set residences located between
the receptor and Beckmans Road. If it is proposed to construct high set residences on allotments
between the receptor and Beckmans Road significant screening of traffic noise from Beckmans Road
would be provided to the receptor.

The noise level limit for formal external open space of 63 dB(A) Lio(|8hour) | metre from the
building facade would be exceeded at allotments 167 — 171 and allotments 178 - 181.

Noosa Shire Council has indicated that the preferred option for noise amelioration at allotments
which exceed the external noise level limit of 60 dB(A) Lio (18 hour) | metre from the building
facade is to incorporate architectural treatments into the facade of proposed buildings to comply with
the internal noise criteria in shown in Table 4.1.

The maximum predicted external Leq(| hour) noise levels are used to determine the necessary traffic
noise reduction (TNR) required from the facade nearest to Beckmans Road by subtracting the
AS2107 internal noise level goals of 45 dB(A) for living areas and 40 dB(A) for bedrooms from the
maximum predicted external Leq({| hour) daytime and night time noise levels respectively.

Table 5.3 shows that the 63 dB(A) Lio (12 hour) noise level criteria for parks and recreational areas
would be achieved in the centre of the public open space 901 and public open space 902 (see Figure
2).

7 Noise Control Measures

The 63 dB(A) Lio(! 8hour) noise level criterion for formal external open space would be exceeded at
allotments 167 — 171 and allotments 178 — 181 without the inclusion of noise barriers. These lots will
require formal external open space areas to be designed and located to reduce road traffic noise
levels. This may include the use of acoustic barriers on the allotment site, or by location of recreation
areas on the ‘quiet’ side of dwellings (ie. the facade that is shielded from road traffic noise from
Beckmans Road).

3052R01V03.doc Proposed Residential Subdivision Beckmans Road, Tewantin Lensworth Lake Doonella Pty Ltd c/- PMM Group Pty Page Ui

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