130814 Acoustic Report 230913 · MCU13/0171

Cooroy Property Trust Pty Ltd c/- Lavin Trading
Environmental Noise Level Study for Proposed Wimmers Soft Drink Manufacturing Facility,
271 Lake Macdonald Drive, Lake Macdonald                                                                     Page 5 of 32




CRITERIA

Measurements and Calculations

All noise level measurements were conducted in accordance with the following:

•   general requirements of the Queensland environmental protection legislation;
•   Environmental Protection (Noise) Policy 2008;
•   Brisbane City Council City Plan 2000;
                                                                                                                 rd
•   Noise Measurement Manual, Queensland Government – Environmental Protection Agency, 3
    Edition, March 2000; and
•   Australian Standard AS 1055.1-1997, Acoustics – Description and Measurement of Environmental
    Noise, Part 1, General Procedures.

Noise Limits

The noise sources associated with the soft drink manufacturing facility are either steady state or time-
varying.

Steady state noise could include airconditioning units, fans, pumps, cooling towers, etc whilst time
varying noise sources include on-site vehicle activities, forklifts, etc.

In accordance with Hassall, J R & Zaveri, K, Acoustic Noise Measurements, Bruel & Kjaer, Denmark,
January 1979:

         “… The following short table shows the subjective effects of changes in noise levels.

                               Change in Noise Level                 Subjective Response
                                         3                               just perceptible
                                         5                             clearly perceptible
                                         10                            twice as loud … “

For time-varying noise sources, the selected noise limit criteria should ensure that the existing acoustic
amenity does not significantly deteriorate. From the above reference, a change in noise level of 5 dB(A)
is clearly perceptible, whereas a change of 3 dB(A) is only just perceptible. On this basis, the noise limit
for time-varying noise is that, for like parameters, the source noise level combined with the ambient
noise level should not exceed the ambient noise level by more than 3 dB(A), after due consideration of
tonality and impulsiveness.

For the night-time, the noise limit criteria is that of the World Health Organisation document Guidelines
for Community Noise, 1999:

         “… For a good sleep, it is believed that indoor sound pressure levels should not exceed
         approximately 45 dB(A) LAmax more than 10-15 times per night. …”

This is the noise limit that has been adopted for the night-time period and is assessed for inside the
closest residences (whereas the time-varying noise limits for daytime and evening are external to the
residences.

For steady-state noise, the commonly applied residential noise limit criteria are as follows:

•   daytime (0700 to 1800 hours):               background + 5 dB(A)
•   evening (1800 to 2200 hours):               background + 5 dB(A)
•   night-time (2200 to 0700 hours):            background + 3 dB(A)



David Moore & Associates Pty Ltd                                               Our reference: R13095/D2847/Rev.0/23.09.13