Appendix 6. Odour Buffer Assessment [As Published] · 132007.2399

No long term on-site weather data are available, but local conditions were
modelled using the recognised meteorological models (TAPM) a and CALMET.


4.1.2 Community Odour Survey
A small community odour survey conducted by PAE in existing residential areas to
the northwest of the STP) indicated that the majority of people surveyed could not
detect odour from the STP. Indeed many were unaware of the existence of the
STP. From a total of 15 respondents, one could regularly detect odour while
another two said that they could smell the STP but only about once per year.

4.1.3 Field Odour Intensity Surveys
Paired odour intensity observations were made on 21 December 2004 and 11
January 2005 by PAE staff at four locations in the area adjacent to the sewage
treatment plant. These observations were made primarily to assist in verifying
model predictions of ambient odour levels. Taking into account the small number of
samples and the inherent uncertainty in the data, the field observations were
broadly consistent with the model predictions of odour at the times of the
observations.

4.1.4 Assessment and Conclusions
Dispersion modelling of the significant odour sources within the Noosa STP using
CAPLUFF indicated that odour impact in the area of interest within the Precinct G
development was below the Queensland odour guideline level of 2.5 ou.

After assessing the combined results of dispersion modelling, odour complaints
records and a small community survey we concluded that the odour impacts at the
area of interest within the Precinct G development were not expected to result in
significant annoyance to future residents. Any odour impacts were predicted to
occur at night and would be infrequent.

4.2 Precinct J Assessment
For the current assessment, the modelling performed for the Precinct G
development has been adopted. The predicted C99.5 1hr odour impact is shown in
Figure 4.1.




a
  The EPA Guideline on Odour Impact Assessment from Developments (July 2004), section
6.4, states: “The CSIRO‟s air quality model TAPM can be used to generate hourly one-year
meteorological data required for the dispersion models. This is a prognostic meteorological
model, which eliminates the need to have site-specific meteorological observations. The model
can predict airflow important to local scale air pollution such as sea breezes and terrain
induced flows. For sites where observed meteorological data is not available and the site is
subject to the sea and land breeze effects, it is preferable to use TAPM model for the
generation of meteorological data.”

1898b Report.doc                                                                                7
Noosa Springs Precinct J Development StarCo Developments Limited
PAE Job 1898b