07/2398 - Revised Noise Report and cover letters to referral agencies [As Published] · 132007.2398

RSL Care —
Proposed RSL Retirement Village, Cooroy - Road and Rail Noise Assessment (Revised) —

 

5.3. TRAFFIC DATA

The Queensland Department of Main Roads has provided 2006 traffic data for the Cooroy
Connection Road, north of Pearsons Road. The 2005-2006 growth rate for the Cooroy Connection
Road is 5.35 %. This growth rate has been applied to predict 2007, 2008 and 2018 AADT counts.
Table 5.1 presents a summary of the traffic data used for the assessment.

TABLE 5.1: AADT DAILY PREDICTED TRAFFIC VOLUMES

 

 

 

 

 

 

Cooroy Connection Road
Year
% Heavy Vehicles AADT
2006 10 6,180
2007 10 6,511
2008 10 6,859
2018 10 11,554

 

 

 

 

 

§.4 MODELLING ASSUMPTIONS

As identified on Figure 2, the retirement village is proposed to have both single-storey and two-
storey buildings. Noise level! predictions assume a receptor height of 2.0 m and 5.0 m above the
existing ground level for ground floor and first floor housing respectively. For outdoor private open
spaces, noise contours have been modelled at 1.5 metres above existing ground levels.

A noise source height of 0.5 m is adopted for vehicles on the Cooroy Connection Road. Variations
in speed (and therefore traffic noise) were determined by the model in accordance with the
corrections described in CoRTN (1988) based on the road gradient and percentage of heavy
vehicles in the fleet being considered.

5.5 NOISE PREDICTIONS
§.5.1. Introduction

Noise predictions were undertaken for 2018 as required by the Queensland Department of Main
Roads. The following sections discuss in detail the results of the noise modelling and the predicted
compliance.

5.5.2 Model Validation

Comparison of the monitoring results with the predicted receptor noise levels for existing traffic
levels indicates that the modelling is over-predicting by up to 1.8 dB(A), as shown in Table 5.2
below. This prediction is within the 2 dB(A) variation specified in the DMR’s Road Traffic Noise
Management: Code of Practice. Hence the noise model has been considered valid for the
purposes of this acoustic assessment.

 

AIR NOISE ENVIRONMENT PTY LTD
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