MCU14/0056 Acoustic report Att H - Information response

It should be noted that AS 1055.2:1989 also states the following:

          Difference of 5 dB or less may be of marginal significance with respect to annoyance.

AS 1055.1:1989 ‘Acoustics-Description and measurement of environmental noise Part 1: General
Principles’ states that:

          LA90,T is commonly taken to be an approximation of LAbg,T

          LA10,T is commonly taken to be an approximation of LAmax,T

With adoption of the Environmental Protection (Noise) Policy 2008, Reprint 1A, 2012 ‘Background
Plus’ criteria have been changed from those used informally. Environmental Protection (Noise)
Policy 2008 adopts the following ‘Background Plus’ criteria to control background creep:

     (b) for noise that varies over time measured by LAeq,adj,T—more than 5dB(A) greater than the
        existing acoustic environment measured by LA90,T.

The latest ‘Background Plus’ noise criteria as defined in the Environmental Protection (Noise) Policy
2008 have been used to assess potential annoyance from industry located to the southeast of the
proposed site. The use of an LAeq descriptor allows for the accumulated noise level emission from
numerous facilities and sources to be assessed simultaneously.

2.2.1 Sleep Disturbance

World Health Organisation document entitled “Guidelines for Community Noise” (WHO, 1999)
recommends that to avoid sleep disturbance within bedrooms, indoor guideline values of 45 dB LAmax
should be adopted for single sound events.

Therefore an internal noise level goal of 45 dB(A) LAmax has been used to assess the potential for
sleep disturbance from industry to the southeast of the site. A facade reduction of 5 dB(A) is
assumed for windows open and therefore an external limit of 50 dB(A) LAmax has been assumed.




0009-R2-01 VerveBD Mixed Use Cooroy Noise Report.docx                                                   6
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