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 7 of 16




With respect to the above night-time ambient noise levels, the Acoustic Quality Objectives for the
night-time are:

              o    35 dB(A) LAeq,adj,1H;
              o    40 dB(A) LA10,adj,1H; and
              o    45 dB(A) LA1,adj,1H.

The current average night-time ambient noise levels exceed this noise limit criteria by 6.5 dB(A)
LAeq,1H, 6.6 dB(A) LA1,1H and 1.8 dB(A) LA10,1H. This difference between the current average night-time
ambient noise levels and the noise limits should ensure that any noise from the proposed wave lagoon
will be either inaudible or only just barely audible at the closest residential.

Based on the above the noise limits are:

        pumps and blowers:
            o daytime (0700 to 1900 hours):                     41 + 5 = 46 dB(A) LAeq,adj,T;
            o evening (1900 to 2200 hours):                     39 + 3 = 42 dB(A) LAeq,adj,T;
            o night-time (2200 to 0700 hours):                  inaudible = ≤ 30 dB(A) LAeq,adj,T;

        people noise:
            o daytime and evening:
                      50 dB(A) LAeq,adj,1H;
                      55 dB(A) LA10,adj,1H; and
                      65 dB(A) LA1,adj,1H;
            o night-time:
                      35 dB(A) LAeq,adj,1H;
                      40 dB(A) LA10,adj,1H; and
                      45 dB(A) LA1,adj,1H;


SOURCE NOISE LEVELS

Typical source noise levels are:

Steady state sources:

        blower (total of 8):
             o discharge air:                  119 dB(A) LWA each;
             o casing radiated:                88 dB(A) LWA;
        pump (assumed 2 of):                  90 dB(A) LWA;

Time varying noise source:
    people:                                   62 dB(A) LAeq,adj,T, 70 dB(A) LA1,adj,T and 65 dB(A) LA10,adj,T @
                                               10 m.

The blower source noise data was extracted from a report prepared for a wave lagon (believed to be
of similar size) at Palm Springs, California. The quoted blower is manufactured by Chicago Blower
Corporation, model 6105SW.

It is believed that the blowers and pumps will be located under-ground/built into an embankment and
contained within a concrete structure (or equivalent) – concrete floor, walls and roof. It has been
further assumed that the concrete structure will have a minimum Rw 50 (noise reduction of 45 dB(A)).




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