MCU14/0056 Acoustic report Att H - Information response

                         Table 4.3: Comparison of Measured and Calculated Noise Levels
        Location             Measured LA10(18 hour)    Calculated LA10(18 hour)      Modelled Difference
                                      dB(A)                     dB(A)
           N1                              65.5                      65.5                            0.0
           N2                              56.6                      61.8                            5.2



A comparison of the freefield calculations and measurements at Location N1 show that the model is
considered to be verified as the modelled difference is within the ± 2 dB(A) range.

The measured level at Location N2 is considered to be influenced by vegetation attenuation effects
(vegation 10 to 15 m in depth) which are not considered in the CoRTN algorithm. Measurements
conducted by Huddart, 1990 noted attenuation effects were in the order of 2 to 6 dB (LA10)
(recommends 5 dB for dense vegetation) for 10 m of vegetation when compared to grassland. This
research noted that the effectiveness of vegetation attenuating traffic noise is variable and is
greatest close to the road and diminishes as the distance from the road increases. Considering the
measured noise level with respect to these vegetation influences the modelled difference is likely to
be 3.2 dB to -0.8 dB (0.2 dB based on recommendation for dense vegetation) and for the purposes of
this assessment the model is considered to be verified at Location N2. It is noted that vegetation’s
effects have only been considered for verification and have not been included in the 2024 noise
predictions.

4.5 Predicted Noise levels

Noise levels were predicted for the year 2024 at the proposed tourist park. Table 4.4 presents the
facade corrected (+2.5 dB(A)) predicted road traffic noise levels for site office, cabins and pool area
(free field) with and without proposed barriers presented in Figure 4.2. Predicted noise levels are
1.5 m above floor levels provided in Table 4.1.

As the construction is unknown at this stage QDC noise level categories are presented with the
proposed barrier in Table 4.1. Predicted road traffic noise levels are presented for ground floor
receptors (caravan parking spaces) in Figure 4.3 and for the pool area in Figure 4.4. Predicted facade
noise levels contours are 1.8 m and 1.5 m above natural ground levels on a 1 m x 1 m grid for
caravans and pool area receptors.

                                 Table 4.4: Predicted 2024 Road Traffic Noise Levels
                                                           LA10(18 hour) Facade Reflected
                                                                                              QDC MP 4.4 Category
      Building               Room                 Facade          Noise Level dB(A)
                                                           No Barrier       With Barrier    No Barrier     With Barrier
                                                   NW            57              57             0               0
                          Living Dining
                                                   NE            59              59             1               1
                                                   NE            60              60             1               1
Manager's Residence        Bedroom 1
                                                   SE            62              62             1               1
                           Bedroom 2               SE            59              59             1               1
                                          Roof                   65              65            65               2
       Cabin 1                                     SW            66              65             2               2
       Cabin 1            Living Dining            NW            65              61             2               1
       Cabin 1                                     NE            59              59             1               1

0009-R2-01 VerveBD Mixed Use Cooroy Noise Report.docx                                                               14
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