Attachment 6 - Odour Impact Assessment - Katestone · 132005.638.06

8.       CONCLUSIONS
Katestone Environmental Australia Pty Ltd (Katestone) was commissioned by Noosa Council to conduct an odour
assessment of a proposed in-vessel composting activity to be located at the existing Noosa Resource Recovery
Centre at 561 Eumundi–Noosa Road, Doonan.

Dispersion modelling of odour emissions has been conducted using the approved regulatory dispersion model,
CALPUFF. Ground-level concentrations of odour associated with the proposed composting operations have been
predicted at nearby sensitive receptors and across a Cartesian grid of receptors. A cumulative assessment has
been conducted including the addition of odour emissions from the existing landfill facility on the same site.

The assessment has demonstrated that the composting facility will have a negligible odour impact, being highly
unlikely to lead to odour impacts at sensitive receptors. The maximum predicted 99.5th percentile 1-hour average
odour concentration at a sensitive receptor as a result of emissions from the composting operation in isolation is
just 0.4 ou.

The assessment has identified a greater likelihood of the landfill operations contributing to odour impacts, which is
consistent with the small number of complaints received in relation to the landfill operations. The modelling, when
applying highly conservative upper bound emission rates for landfill activities, has identified the potential for
exceedance of the Odour Guideline of 2.5 ou at three properties (maximum concentration of 3.0 ou).

Bearing in mind that odour impacts as a result of landfill operations have only been predicted in the worst-case
upper bound emissions scenario, it is considered that consistent application of best practice management
measures for controlling odours from landfills (such as consistent and comprehensive application of day cover, and
prompt installation of gas extraction following filling of landfill cells) should be adequate to ensure that impacts are
minimised, if not entirely prevented.

The proposed composting operation, provided it is well-managed, is highly unlikely to contribute meaningfully to
any odour impacts.




 Katestone Environmental Australia Pty Ltd                                                        17 September 2026
 D25072-8 Noosa Council - Noosa Composting Odour Assessment - Final                                        Page 20