RFI accoustic updated 2016

                                                                                         ACOUSTICS & AIR QUALITY

6.3     Verification

The results of the noise survey carried out at Location A have been used to verify the road traffic
noise model of Cooroy Connection Road (Elm Street).
The road traffic verification model uses the 2014 traffic flow, as stated in Section 6.2 and
current road alignment to determine the L10(18hour). Table 6.2 compares the results obtained
from the noise survey with the calculated results from the computer model.


Table 6.2 Existing and Calculated Road Traffic Noise Level

   Receptor Height              Measured Noise Level                 Calculated Noise Level
         metres                    L10(18 hour) dBA                     L10(18 hour) dBA
          1.3m                           55.9                                 56.8


The road traffic model is considered to be verified since the calculated level is within ± 2.0 dBA
of the measured level, and is considered conservative as it is over-predicting by a small amount..


6.4     Calculations

The road traffic noise levels for 2024 have been predicted for all proposed allotments and all
rooms of the proposed aged care facility. The L10(18hour) noise levels have been predicted
under two separate development conditions:
   i.    Without acoustic barriers
  ii.    With the acoustic barriers nominated in Figure 6.1.
The predicted L10(18hour) noise levels with no acoustic barrier for the allotments are presented
in Table C.1 in Appendix C, and for the rooms in the aged care facility in Table C.2 in Appendix C.
(Refer to Figure 3.2 for numbering of rooms).
From Table C.1 it can be seen that the highest predicted noise level is 69 dBA L10(18hour) on
lots 113, 114 and 137. From Table C.2 it can be seen that the highest predicted noise level in
the aged care facility is 67 dBA L10(18hour) in rooms 13, 14, 15, 16, 17, 18, 19, 20 and the
nurse station in D Wing. All other allotments and rooms have lower levels of noise exposure.
Based on these predicted noise levels, the MP4.4 Noise Categories in Table C.1 and Table C.2
extend up to Noise Category 3 for road traffic noise.
The predicted L10(18hour) noise levels presented in Appendix C exceed the noise limits of 60
dBA (1m from the facade) and 57 dBA (free-field) from Section 4.2.2. Therefore an acoustic
barrier is proposed to mitigate road traffic noise impact. The location and height of the
recommended acoustic barrier is presented in Figure 6.1.




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