MCU14/0056 - Attachment F - Acoustic Assessment

                         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. Predicted facade noise levels contours are 1.8 m
above natural ground levels.

                                 Table 4.4: Predicted 2024 Road Traffic Noise Levels
                                                LA10(18 hour) Facade Reflected Noise Level          QDC MP 4.4
    Building                Location                              dB(A)                               Category
                                                No Barrier                With Barrier       No Barrier    With Barrier
                           Southwest                    66                    58                 2              1
                           Northwest                    62                    59                 1              1
  Site Manager
                           Northeast                    61                    60                 1              1
                           Southeast                    66                    60                 2              1
                           Southwest                    66                    64                 2              2
                           Northwest                    65                    59                 2              1
     Cabin 1
                           Northeast                    60                    60                 1              1
                           Southeast                    65                    65                 2              2
                           Southwest                    62                    61                 1              1
     Cabin 2
                           Northwest                    64                    60                 2              1

0009-R1-01 VerveBD Mixed Use Cooroy Noise Report.docx                                                                13
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