Attachment 6 - Odour Impact Assessment - Katestone · 132005.638.06

      •   The odour emission rate of 0.672 ou/m2/s used as the average for the maturation bays has been taken
          from the assessment of another composting facility in QLD, one which received a mixture of green waste,
          solid wastes, and liquid wastes with a higher odour risk rating than the proposed composting operation.
          The emission rate represents a scaled average based on odour sampling of compost of age 4, 6, 10 and
          16 weeks. Given the wastes accepted at the sampled facility, it is considered likely to represent a
          conservatively high average odour emission rate for the maturation bays at the proposed composting
          operation.

Overall, the types of wastes and procedures assessed by the selected literature are likely to be suitably
representative of operations and odour generation at the proposed composting facility.

Table 1          Odour emission rates for composting operations

                                                                                                  Odour emission rate
               Odour emission source                         Site-specific sources
                                                                                                      (ou/m2/s)

                    Green waste                          Commercial drop1, Public drop                       2.4
                Freshly mixed waste                     Bunker, Freshly mixed compost                         4
     Air from tunnels and other enclosed areas                        Biofilter                             1.85
                Pasteurised compost                              Maturation bays                           0.672
 Table note:
 1
   The area marked commercial drop was originally understood to be a location for a green waste stockpile. This has since
 been revised so that this stockpile (of the same area) is to be located to the southwest, where it is annotated “STOCKPILE
 285 m2”. This source being located ~30 m further to the west than where it has been modelled will not have a material
 influence on the modelling outcomes or assessment conclusions. This is discussed further in Section 7.




Figure 2         Layout of odour sources at the proposed composting facility




 Katestone Environmental Australia Pty Ltd                                                              17 September 2026
 D25072-8 Noosa Council - Noosa Composting Odour Assessment - Final                                               Page 9