Appendix 4 - accoustic report · MCU19/0117

Mark Bain Constructions Pty Ltd
Environmental Noise Level Impact Assessment for Proposed Wave Lagoon, 500/90 Beach Road,
Noosa North Shore                                                                                      Page 8 of 16




NOISE LEVEL IMPACT

The concrete structure containing the blowers and pumps is proposed to be located adjacent to the
western corner of the wave lagoon, which has a separation distance of approximately:

        160 metres to the closest residence to the west:
        700 metres from the closest residence to the south.

Compliance with the noise limits at the closest residence to the west will also result in noise limit
compliance at all other nearby residences.

Whilst it is most likely that the wave lagoon will only be used during daylight hours, this could be as
early as 0500 hours in the summer. There is also a small likelihood that the wave lagoon could be
used during the evening, up to 2200 hours. It has been assumed that the generation of waves could
occur at any time from 0500 hours to 2200 hours.


Steady State Noise Sources

At the closest residence to the west the noise of the plant and equipment, which will all be located
inside a concrete structure (or equivalent) the noise level impact would be:

        blower discharge:          119 LWA + 9 (total of eight blowers) – 52 (distance of 160m) – 45
                                    (concrete structure) – 7 (ground) = 24 dB(A) LAeq,adj,T;
                                    122 LWA + 9 – 52 – 45 – 7 = 27 dB(A) LA1,adj,T;
                                    120 LWA + 9 – 52 – 45 – 7 = 25 dB(A) LA10,adj,T;

        blower radiated:           88 LWA + 9 (total of eight blowers) – 52 (distance of 160m) – 45
                                    (concrete structure) – 7 (ground) = -7 dB(A) LAeq,adj,T;
                                    91 LWA + 9 – 52 – 45 – 7 = -4 dB(A) LA1,adj,T;
                                    89 LWA + 9 – 52 – 45 – 7 = -6 dB(A) LA10,adj,T;

        pumps:                     90 dB(A) LWA + 3 (two pumps) – 52 (distance of 160m) – 45
                                    (concrete structure) – 7 (ground) = -11 dB(A) LAeq,adj,T;
                                    93 dB(A) LWA + 3 – 52 – 45 – 7 = -8 dB(A) LA1,adj,T;
                                    91 dB(A) LWA + 3 – 52 – 45 – 7 = -10 dB(A) LA10,adj,T;
        combined:                  24 dB(A) LAeq,adj,T, 27 dB(A) LA1,adj,T and 25 dB(A) LA10,adj,T.


The combined noise level of all of the eight blowers and two pumps comply with both the default noise
standard for pumps, as well as the acoustic quality objectives.


Time Varying Noise Source

The most likely time varying noise source is people noise from the wave lagoon, with a separation
distance of approximately 180 metres to the closest residence to the west.

At this closest residence to the west the noise level impact of the time varying noise source will be:

        people:            62 dB(A) LAeq,adj,1H @ 10m – 25 (distance of 55m) – 7 (ground) = 30 dB(A)
                            LAeq,adj,1H;
                            70 dB(A) LA1,adj,1H @ 10m – 25 – 7 = 38 dB(A) LA1,adj,1H;
                            65 dB(A) LA10,adj,1H @ 10m – 25 – 7 = 33 dB(A) LA10,adj,1H;

The above people noise complies with the acoustic quality objective criteria for the daytime, evening
and night-time, with no additional noise control measures required.



David Moore & Associates Pty Ltd                                       Our reference: R19099/D3453/Rev.0/21.01.2020