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5361- Kilmainhamwood Compost Facility Extension- EIS Odour Dispersion Modelling Results for Scenarios 1 and 2 AERMOD Prime (USEPA ver. 07026) was used to determine the overall odour impact of the existing and proposed Kilmainhamwood Composting Facility design. Impacts from emission points are assessed in accordance with the impact criterion contained in Section 9.2.3.6 and 9.2.3.7. Two distinct scenarios were assessed: The output data was analysed to calculate the following: Ref Scenario 1: • Predicted odour emission contribution of overall existing composting facility design operation to surrounding population (see Table 9.6), to odour plume dispersal at the 98 th percentile for a ground level concentration of less than or equal to 1.50 OuE m -3 (see Figure 9.3). • Predicted odour emission contribution of overall existing composting facility design operation to surrounding population (see Table 9.6), to odour plume dispersal at the 99.5 th percentile for a ground level concentration of less than or equal to 6.0 OuE m -3 (see Figure 9.4). Ref: Scenario 2: • Predicted odour emission contribution of overall proposed composting facility design operation to surrounding population (see Table 9.7), to odour plume dispersal at the 98th percentile for a ground level concentration of less than or equal to 1.50 OuE m-3 (see Figure 9.5). • Predicted odour emission contribution of overall proposed composting facility design operation to surrounding population (see Table 9.7), to odour plume dispersal at the 99.5th percentile for a ground level concentration of less than or equal to 3.0 OuE m-3 (see Figure 9.6). • Comparison between predicted odour impact for existing and proposed facility design for the 98th percentile of hourly averages (see Figure 9.7). • Comparison between predicted odour impact for existing and proposed facility design for the 99.5th percentile of hourly averages (see Figure 9.8). For inspection purposes only. Consent of copyright owner required for any other use. These computations give the odour concentration at each Cartesian grid receptor location that is predicted to be exceeded for 0.5% (44 hours) and 2% (175 hours) of five years of hourly sequential meteorological data. This will allow for the predictive analysis of any potential impact on the neighbouring sensitive locations while the composting facility is in operation. It will also allow the operators of the facility to assess the effectiveness of their odour abatement/minimisation strategies. The intensity of the odour from the two or more sources of the facility operation within the composting facility will depend on the strength of the initial odour threshold concentration from the sources and the distance downwind at which the prediction and/or measurement is being made. Where the odour emission plumes from a number of sources combine downwind, then the predicted odour concentrations may be higher than that resulting from an individual emission source. It is important to note that various odour sources have different odour characters. This is important when assessing those odour sources to minimise and/or abate. Although an odour source may have a high odour emission rate, the corresponding odour intensity (strength) may be low and therefore is easily diluted. 133 EPA Export 01-06-2010:03:55:58
5361- Kilmainhamwood Compost Facility Extension- EIS Figure 9.3 Predicted Existing Kilmainhamwood Composting Facility Odour Dispersion Modelling Assessment Contour Plots for Scenario 1 (98th Percentile for an Odour Concentration of ≤ 1.5 OuE m-3) For inspection purposes only. Consent of copyright owner required for any other use. Residential Locations Predicted odour emission contribution of existing overall Kilmainhamwood Composting Facility operation to odour plume dispersal for the 98 th percentile for an odour concentration of ≤ 1.5 OuE m -3 ( ) for 5 years of hourly sequential meteorological data from Clones (2002 to 2006 inclusive). 134 EPA Export 01-06-2010:03:55:58
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