2016-04-19 P&E Committee - Item 1, Attachment 2 - Air Quality Assessment Report

Figure 4.1: Modelled Downwash Structures




4.8        Summary of Modelling Assumptions
As noted above, several assumptions were adopted for the purposes of estimating emissions from
the service station. Overall, these assumptions represent a conservative approach and are consistent
with recommendations made by overseas regulatory authorities. The assumptions adopted are as
follows:

⚫ all fuel handling is considered to be petrol providing a conservative emissions generation
    procedure (i.e., petrol has a higher volatility than diesel);

⚫ a minimum efflux velocity was adopted for the vent stack emissions of 0.1 m.s -1. This allows
    modelling of these as point sources;

⚫ to ensure worst case meteorological conditions are considered, it is assumed that bulk tanker
    deliveries occur continuously throughout the year (day and night);

⚫ for tank filling, a fuel delivery of 40,000 L/hour for the E10 tank has been considered;
⚫ all fugitive emissions were assumed to occur in the working area of the service station (i.e. a
    rectangular volume source located around the petrol bowsers) below the roofed area;

⚫ an average filling and transaction time of 4 minutes per vehicle;
⚫ an average 40 L of fuel per vehicle refuelling.


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                            Synergy Property Partners Pty Ltd- Air Quality Assessment - Proposed Service Station, 123 Eumundi-Noosa Road, Noosaville
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