Environmental Noise Level Impact Assessment of Facilities Building · 132005.1133.13

Altum Constructions
Environmental Noise Level Impact Assessment of Facilities Building, Parkridge, 75 Resort Drive, Noosa Heads       Page 8 of 16




Measured Noise Levels

On Wednesday 13th November, during the early evening, source noise level measurements were
obtained, as all of the above plant and equipment has been commissioned and was operating (for the
purpose of assessing the noise level only). However, at this time the kitchen exhaust fan ductwork was
not connected to the rooftop cowl and the acoustic louvre had not been installed.

By late November 2019 the acoustic louvre was installed to the western side of the rooftop plant deck
and the kitchen exhaust fan connected to the roof cowl. On Monday 2 December 2019 a further noise
assessment was conducted, to determine the magnitude of noise reduction achieved by these further
works. The results of this further noise assessment, from the eastern (rear) boundary fence of Block 3,
with the microphone elevated 7.5 metres to be equivalent to the top floor of residential in Block 3) are as
follows.

During the ambient noise assessments (kitchen exhaust fan OFF) there was some limited domestic
noise from the closest occupied apartments, including people talking and televisions, with some distant
noise from the irrigation system watering the vegetated embankment to the east.


   Plant and Equipment and Evening Background Noise Assessment from Rear (Eastern) Boundary of Block 3,
                  Microphone Elevated to be Level with Top Level of Residential Apartments
                                                                                            Noise Level, dB(A)
   Time                                 Description
                                                                                   LAeq,T     LA1,T      LA10,T      LA90,T
               Ambient sound level, no noise from Utilities Building
1845-1850                                                                          40.9       46.1       42.4        39.0
               audible
1858-1903      Kitchen exhaust fan at 100%                                         52.9       53.8       53.3        52.4
1906-1911      Kitchen exhaust fan at 75%                                          46.0       47.5       46.5        45.4
               Ambient sound level, no noise from Utilities Building
1914-1920                                                                          41.5       44.6       42.4        40.4
               audible
               Ambient sound level, no noise from Utilities Building
1921-1926                                                                          41.9       44.2       42.9        40.7
               audible

From the above results, for the early evening the average background sound level was 40 dB(A) LA90,T,
which is the same as the evening background sound level adopted to determine the evening noise limit.
By late evening/early night-time it would be expected that the background sound level could reduce to
as low as the adopted level of 35 dB(A) LA90,T.

On Wednesday 18 December 2019 a further noise assessment was conducted, to determine the
magnitude of noise reduction achieved if the kitchen exhaust fan speed is reduced to 50% - ‘low’. The
results of this further noise assessment, from the eastern (rear) boundary fence of Block 3, with the
microphone elevated 7.5 metres to be equivalent to the top floor of residential in Block 3) are as follows.


   Plant and Equipment and Evening Background Noise Assessment from Rear (Eastern) Boundary of Block 3,
                  Microphone Elevated to be Level with Top Level of Residential Apartments
                                                                                            Noise Level, dB(A)
   Time                                 Description
                                                                                   LAeq,T     LA1,T      LA10,T      LA90,T
2111-2116      Kitchen exhaust fan at 50%                                          39.4       42.8       40.5        38.2
               Ambient sound level, no noise from Utilities Building
2120-2125                                                                          39.0       45.1       41.2        37.5
               audible




David Moore & Associates Pty Ltd                                                Our reference: R19083/D3422/Rev.2/18.12.19