Accoustic Impact Report MCU12/0012

Noosa Quad Bike Tours
Environmental Noise Level Assessment of Quad Bike Rider Competency Assessment Circuit,
298 Tablelands Road, Cooran                                                                                    Page 4 of 11




As the quad bike will be governed for all Noosa Quad Bike Tour riders, the adopted source noise level
for one quad bike is the average of the governed results, namely 63.6 dB(A) LA10,T. From the
frequency spectrum of the quad bike a total adjustment of +2 dB(A) is required. There is no impulsive
noise associated with the use of the quad bike.


Therefore the source noise level is 66.6 dB(A) LAlo.adj,T at a separation distance of 10 metres.


If twelve quad bikes were all using the tesVtraining circuit at the same time, and all were dispersed
approximately equi-spaced around the tesVtraining circuit, then the combined noise level would be:

.   two bikes @ an average of 10m = 66.6 + 3 (two bikes)               =   69.6 dB(A) LA10,adj,T @ 10m;


.   4 bikes @ an average of 14m         =   66.6 + 6 (four bikes)   -
                                                                       3 (increased distance)      =   69.6 dB(A)


    LA10,adj,T @ 10m;

.   4 bikes @ an average of 18m         =   66.6 + 6 (four bikes)   -
                                                                       5 (increased distance)      =   67.6 dB(A)


    LA10,adj,T @ 10m;

.   2 bikes @ an average of 20m         =   66.6 + 3 (two bikes)   -
                                                                       6 (increased distance)     =    63.6 dB(A)


    LA10,adj,T @ 10m;

    all of the above combined      =   69.6 + 69.6 + 67.6 + 63.6    =   74.2 dS(A) LA10,adj,T@ 10 metres


The source noise level applied in this report is 74.2 dB(A) LA10,adj,T @ 10 metres, for twelve quad bikes
using the tesVtraining circuit simultaneously.


NOISE LEVEL IMPACT


At the closest residences to the proposed tesVtraining circuit for the quad bikes of Noosa Quad Bike
Tours noise will reduce due to separation distance, dense intervening vegetation and ground
attenuation and, for one of the residences, intervening ridgeline acting as an acoustic barrier. Based
on a   previous noise assessment conducted by the consultant of sound reduction through dense
Queensland vegetation the measured noise level reduction due to this vegetation (in addition to
distance attenuation) was 5 dB(A) for apprqximately 100 m of vegetation.


For the quad bike tesVtraining circuit the minimum distance of dense vegetation is at least 200 m and,
therefore, a vegetation and ground attenuation reduction of 10 dB(A) has been applied.

At the closest residences to the proposed tesVtraining circuit for the quad bikes of Noosa Quad Bike
Tours the noise level of these quad bikes will be:


    .     closest residence to north-west: 74.2 dB(A) LA10,adj,T @ 10m            -
                                                                                    31 (separation distance of
                                                350m)  -
                                                            10 (intervening vegetation)     =   33.2 dB(A) LA10,adj,T;


    .     closest residence to west:            74.2 dB(A) LA10,adj,T @ 10m31 (separation distance of
                                                                                  -




                                                350m) 10 (intervening vegetation) 5 (intervening ridge line)
                                                        -                                   -




                                                =28.2 dB(A) LA10,adj,T;


    .     closest residence to south:           74.2 dB(A) LA10,adj,T @ 10m       -
                                                                                      28 (separation distance of
                                                250m)   -
                                                            10 (intervening vegetation)     =   36.2 dB(A) LA10,adj,T;


    .     closest residence to south-east: 74.2 dB(A) LA10,adj,T @ 10m 32 (separation distance of
                                                                                  -




                                           400m) 10 (intervening vegetation) 32.2 dB(A) LA10,adj,T.
                                                        -
                                                                                            =




David Moore & Associates Ply LId                                              Our reference: R12054/D2670/Rev.O/8.05.2012