07/2398 - Request for information response [As Published] · 132007.2398

6 Road Traffic Noise Assessment

6.1 Road Traffic Noise Model

QDMR recommends that the prediction of road traffic noise is to be conducted according to the
United Kingdom Department of Transport (1988) procedure published as "Calculation of Road
Traffic Noise” (CoRTN88). The QDMR require that predictions of road traffic noise be carried out
for a 10 Year planning honzon.

The traffic noise modelling was based on plans of the site by Smith & Tracey Arcitects (Drawing
details here).

The road traffic noise levels have been predicted using the PEN3D computer model, based on the
CORTN88 traffic noise prediction method and is approved by QDMR.

In this report a calculated road traffic noise level refers to a road traffic noise level calculation of an
existing measurement. A predicted road traffic noise level refers to a likely future noise level. The
noise model generates both the calculated and predicted road traffic noise levels.

6.2 Road Traffic Noise Modelling Input Data

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Road traffic noise level predictions for the L10(18 hour), and Lto(! hour) maximum assume a 0.5

metre source height, and a dense graded asphalt road surface. A 1.5 m receptor height is assured,

above finished floor height.

The receiver heights are relative to natural ground heights and proposed finished floor levels as

provided by Smith & Tracey Architects.

The traffic noise calculations have been undertaken in accordance with CORTN88 and a +2.5 dB(A)
facade reflection allowance is included in the road traffic noise level predictions.

The road traffic noise level predictions are based on the traffic data provided by QDMR as shown in
Table 6.1.

It should be noted that the speed limit along Cooroy Connection Road changes in front of the
subject site. For northbound traffic the speed limit changes from 60 km/hr to 100 km/hr at
approximately 120 m from the southern boundary of the subject site.

At the same location along Cooroy Connection Road the speed limit changes from 80 km/hr to 60
km/hr as vehicles approach Cooroy.

The road surface was inspected and found to be between a wom chip seal or a dense graded asphalt
surface. As a result | dB(A) was added to the noise emission levels for a dense graded road.

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