Info Request MCU16/0153

                                                                                                     MCU16/0153



                  Issue – Noise monitoring of IGA loading dock

                  The acoustic report makes some assumptions regarding the number, timing and noise
                  levels of trucks that access the IGA loading dock but does not verify the assumptions by
                  attended observations or by noise monitoring on the subject site at representative façade
                  locations near the loading dock. The acoustic report assumes that there will only be a
                  limited number of delivery vehicles that will access the loading dock or shopping village and
                  only after 7am.

                  Information Required

                       13. Unattended noise monitoring shall be conducted at a location on the development
                           site that has a clear view of the loading dock and car park at a height representative
                           of the façade of the first floor motel units for a minimum period of one week. The
                           noise logger is to have one-third octave spectral data and audio recording
                           capabilities so that the source of noticeable dominant events may be confirmed and
                           the contribution of extraneous noise sources may be identified. The noise logger is
                           to record levels continuously with a sampling period no greater than 1 second and
                           preferably one-eighth of a second (FAST response). Of particular interest are the
                           times, durations and frequency spectra of trucks accessing the loading dock for
                           deliveries or waste collection prior to 7am daily and vehicle and patron noise after
                           10pm.

                  Issue – Noise monitoring of IGA roof plant

                  The air-conditioning and refrigeration plant for the IGA are mounted on the roof of the IGA
                  store. The noise emissions are stated in the acoustic report to have been previously
                  measured by ASK on the roof of the IGA store. Plant noise levels but no acoustic spectral
                  information is provided in the acoustic report. The acoustic report does not state whether
                  the propagated noise at the receptor locations is likely to be predominantly low frequency,
                  or whether it has low frequency tonal components.

                       14. A SoundPLAN noise model of the IGA roof-top mechanical plant shall be prepared
                           based upon octave or one-third octave spectral noise data for the roof-top
                           mechanical plant. Noise levels shall be predicted which show the predicted noise
                           contours (1m grid) at the motel (first and second storeys), the four nearest attached
                           houses (first floor) and the nearest linea unit (first floor), with and without the
                           proposed partial enclosure around the mechanical plant. The noise contours shall
                           demonstrate that the proposed partial enclosure barrier (1m height above the height
                           of the mechanical plant) around the sides of the mechanical plant deck provides
                           sufficient noise mitigation for all affected receptors to achieve compliance with the
                           external noise limits.

                       15. Noise calculations shall be conducted which predict the internal noise levels in the
                           motel unit (first and second levels), houses and linea units (upper levels) to confirm
                           compliance with the internal noise criteria in each type of habitable space.
                           Calculations should demonstrate the transmission loss of the building envelope of all
                           affected habitable spaces provides sufficient noise attenuation to achieve
                           compliance with the internal noise limits for IGA mechanical plant noise emissions,
                           including adverse noise character adjustments. The building envelope noise
                           intrusion calculations should be conducted in accordance with the method of
                           AS3671 based upon octave spectral levels and the building envelope construction




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Document Set ID: 20272939
Version: 3, Version Date: 10/02/2017