Noise and Air Quality Impact Assessment W D Milligan 31 July 2014

                                                                                 MWA Environmental




   Consideration has also been given to the potential for catch-out activities and feed
   deliveries to cause sleep disturbance if these activities occur at night. The adopted
   sleep disturbance criterion is an Lmax noise level of 45 dB(A) within a bedroom.
   Considering a noise attenuation of 7 dB(A) through an open window1 this relates to
   an external Lmax criterion on 52 dB(A) at surrounding residential dwellings.

   The adopted design noise criteria for the various activities and periods of the day
   which are specified in Table 2 below were calculated in accordance with the above
   methodology.

   Table 2:         Adopted Design Noise Criteria – dB(A)



                                                                                 ADOPTED
 ACTIVITIES               ADOPTED CRITERIA                      PERIOD                               NOISE LIMIT
                                                                               BACKGROUND



                      Queensland                                                                            LA90
                                                              7am to 6pm           39 dB(A)
                     Environmental                                                                        39 dB(A)
                                             Background
                   Protection (Noise)
                                              + 0 dB(A)
  Ventilation          Policy 2008                                                                          LA90
                                             assessed as      6pm to 10pm          36 dB(A)
    Fans              'Controlling                                                                        36 dB(A)
                                             L90 from the
                  Background Creep':
                                               activity
                   (a) for noise that is                                                                    LA90
                    continuous noise                          10pm to 7am          34 dB(A)
                                                                                                          34 dB(A)

                      Queensland                                                                            LAeq
                                                              7am to 6pm           39 dB(A)
                    Environmental                                                                         44 dB(A)
                                             Background
                   Protection (Noise)
                                              + 5 dB(A)
                      Policy 2008                                                                           LAeq
                                             assessed as      6pm to 10pm          36 dB(A)
  Catch-out           'Controlling                                                                        40 dB(A)
                                             Leq from the
  Activities &    Background Creep':
                                               activity
Feed Deliveries     (b) for noise that                                                                      LAeq
                    varies over time                          10pm to 7am          34 dB(A)
                                                                                                          38 dB(A)

                                                                                                            LAmax
                             Sleep Disturbance                10pm to 7am             n/a
                                                                                                          52 dB(A)




   1 AS3671 states approximately 10 dB(A) noise reduction through a façade with 10% open area. Thus
   approximately 7 dB(A) noise reduction through a façade with 20% open area. A typical 1200x1800
   sliding window relates to approximately 10% open area. A large 2100x2300 sliding glass door
   represents approximately 20% open area. Thus, 7dB(A) noise reduction is conservatively adopted
   based upon a large sliding glass door in the affected façade. Openings larger than 20% open area are
   unlikely to be necessary for ventilation.


   Ridgewood 12-002                                 7                                    31 July 2014