Further information from consultant MCU12/0184

           Mr David Milligan, W Donald Milligan Pty Ltd                                              29 November 2013
           Re: Response to Sunshine Coast Regional Further Information Request of 19 November 2013           -

                                                                                                                 Noise,
                         Dust & Odour Issues     -

                                                     Proposed Poultry Growing Sheds, Ridgewood
                                                                                                     L26013/BH/12-002




           1.           Please provide a response and or revise the modelling you performed with regard to the

                        following points:
           a.           How the year 2008 was determined to be representative of long term weather patterns;


           A brief analysis of the Year 2008 compared to long-term average conditions at the
           nearest Bureau of Meteorology station (Tewantin)is provided in Attachment 3.


           The analysis indicates that the Year 2008 is sufficiently representative of long-term
           trends to be applied for the purpose of this assessment. There are variations in the
           frequency of winds from various directions and speeds as compared to long-term
           averages but these are evident for any year when compared to long-term averages.

           The odour objective being assessed relates to the 44th ’worst’ 1 hour periods of each
           year for each receptor location. The ’worst’ conditions for odour dispersion are
           typically associated with lower (less than 3 metre per second) wind speed conditions.
           The           analysis indicates that wind speeds during 2008 were lower than long-term
           averages and thus may be considered a conservative year in this regard.



           b.           The effect of the radius of influence on Station 1 in TAPM being set at 15 km;


           The radius of influence for the Nambour station is the TAPM observation nudging
           dataset has been                    updated to 5km as per the request from PEL (per email 25
           November 2013).



           c.           Whether the vegetation resolution in the inner domains affects the model output.


           MWA Environmental provided information regarding the land use dataset to PEL by
           email on 21 November 2013. Subsequent advice from PEL (per email 25 November
           2013) is that the land use data supplied appeared appropriate.


           d.           Why the Teixeira algorithm was used in CALMET

           The CALMET model    has been updated to apply the ’MM5toGrads algorithm’
           (ICLOUD=4)as per request from PEL (per email 25 November 2013).


           e.           Whether the THRESHL setting of 0 in CALMET has produced spurious mixing heights at
                        dawn and dusk


           The THRESHL value of 0 was applied by MWA Environmental in accordance with
           the recommended setting from Generic Guidance and Optimum Model Settings for
           the CALPUFF Modeling System for Inclusion into the ’Approved Methods for the
           Modeling and Assessments of Air Pollutants in NSW, Australia’ (TRCfor NSW OEH,
           2011). Box and whisker plots of the mixing heights by hour of day are presented in
~Attachment 4 for review. The results appear reasonable                                  to MWA Environmental.
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