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




           f            Why WSCALM was set at 0.2 m/s

               WSCALM was set to a value of 0.2m/s to account for plume transport during the
               approximate 100 hours of wind speeds predicted by the meteorological model to be
               above 0 m/s but below 0.5m/s. This notwithstanding, the updated modelling has
               been conducted with a WSCALM value of 0.5m/s as per request from PEL (per email
               25 November 2013).




               g.       What the influence of thermal buoyancy on emissions would have on predicted impacts
                        at nearby receptors above the height of the sheds (i.e. the site should be modelled to

                        evaluate this).


               In accordance with PEL request, representation of emissions has been updated to be
               as buoyant point sources in accordance with the method presented in the Best
               Practice Guidance for the   Poultry Industry  Plume Dispersion Modelling and
                                                                                         -




               Meteorological Processing (PAE Holmes for DEEDI, May 2011).

               This        amended
                               source representation considers thermal buoyancy         by way of
               representing emissions at the predicted release temperature of air from the sheds for
               each hour of the batch cycles. Vertical mechanical momentum has been excluded
               using        a    momentum              flux   factor of      0   (rain   hat   function).         The              point        source
               characteristics have been set with varying emission velocity by hour as a function of
               the ventilation        rate divided              by   the    cross    sectional   area       of the effective 16.5m
               diameter point source.


               It    is    our    understanding               that   this   representation       is    in    accordance                       with   the
               recommendations of PEL.



               h.       What the impact would be of setting the initial vertical dispersion at 6 m for a building
                        with a total height of 5 m (both odour and dust).


               As above, the emissions                        representation has been updated                 point sources in
                                                                                                               to
               accordance with the recommendations of PEL.                                   This issue is therefore no longer
               relevant.



               i.       What the impact would be of setting the initial vertical dispersion as modelled for the
                        fitter sources rather than a more representative value for stockpile heights


               MWA Environmental had      previously modelled SIGZI 0.35 (1.5m stockpile height
               divided by 4.3) as a conservative representation. This has been updated to SIGZI
               0.70 (1.5m stockpile height divided by 2.15) for a ground level source as per
               modelling guidance.
                                                                                                                            ~~


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