Newlands Cross Upgrade EIS - European Investment Bank

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South Dublin County Council N7 Newlands Cross Upgrade Environmental Impact Statement Arup Consulting Engineers Table 9.12 Results of DMRB Modelling for Design Year 2025 Receptor Description Scenario R1 N7 East R2 Belgard Road R3 N7 West R4 Fonthill Road 9.5.3.2 Breeze ROADS Assessment CO (µg/m 3 ) Benzene (µg/m 3 ) NO2 (µg/m 3 ) PM10 (µg/m 3 ) PM2.5 (µg/m 3 ) Air Quality Standards 2000 5 40 20 25 Do Min 398.8 2.52 26.86 17.29 10.374 Do Something 393.16 2.51 26.46 17.17 10.302 Increase/Decrease -5.64 -0.01 -0.4 -0.12 -0.072 % Increase/decrease -0.3 -0.2 -1.0 -0.6 -0.3 Do Min 404.94 2.5 26.02 17.26 10.356 Do Something 391.4 2.47 25.15 16.99 10.19 Increase/Decrease -13.54 -0.03 -0.87 -0.27 -0.162 % Increase/decrease -0.7 -0.6 -2.2 -1.4 -0.6 Do Min 395.15 2.51 26.57 17.21 10.326 Do Something 389.02 2.5 26.1 17.08 10.25 Increase/Decrease -6.13 -0.01 -0.47 -0.13 -0.078 % Increase/decrease -0.3 -0.2 -1.2 -0.7 -0.3 Do Min 429.89 2.56 27.83 17.8 10.68 Do Something 464.63 2.6 29.42 18.44 11.06 Increase/Decrease 34.74 0.04 1.59 0.64 0.384 % Increase/decrease 1.7 0.8 4.0 3.2 1.5 The total predicted pollutant concentrations including the output values from the BREEZE ROADS model combined with the background concentrations for the design year, 2025 are presented in Table 9.13 below. The model output values are representative of the worst case receptor values. The receptor showing the highest concentration of pollutants (including the background concentrations), as a result of the proposed scheme is Receptor 4 (refer to Figure 9.3). For Receptor 4 the annual average concentrations of NO2 are predicted to be 23.5 μg/m³, which complies with the AQS of 40 μg/m³ (refer to Figure 9.5); the annual average concentrations of PM10 are predicted to be 16.5 μg/m³ which complies with the existing AQS of 20 μg/m³; annual average concentrations of PM2.5 are predicted to be 9.9 μg/m³, which complies with the proposed concentration cap of 25 μg/m³ and the annual average concentrations of benzene at Receptor 4 are predicted to be 2.4 μg/m³, which complies with the AQS of 5 μg/m³; The model output concentration of CO experienced at Receptor 4 is given in terms of an 8hour average concentration. The predicted output is 69.5 μg/m 3 , which complies with the 8hour average AQS of 10,000 μg/m 3 . However, this does not take into account the background concentration of CO, which is detailed in terms of an annual mean concentration and cannot be summed with the 8-hour mean concentration value. Nonetheless, since the annual CO background concentration of 359.1 μg/m 3 is so small compared to the annual mean CO limit of 2000 μg/m 3 , it is reasonable to contend that even with the addition of the background concentration the total predicted CO concentration will continue to comply with the AQS limit standards. All predicted pollutant concentrations comply with the relevant AQS at all receptors. December 2007 Page 153
South Dublin County Council N7 Newlands Cross Upgrade Environmental Impact Statement Arup Consulting Engineers Table 9.13 Worst Case Pollutant Concentrations predicted using BREEZE ROADS model (2025) CO (8-hour average) Benzene (annual average) NO2 (annual average) PM10 (annual average) PM2.5 (annual average) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) Limit Values Background 10,000 5 40 20/40 25 Concentrations Model Output - 2.42 22.23 16.32 9.79 Concentrations 69.5 0.02 1.3 0.16 0.096 Total Concentrations 69.51 2.4 23.5 16.5 9.9 9.5.4 Overall Air Quality Impact The results of the DMRB assessment of the impact of construction traffic on air quality have shown that the impact will be negligible. The impact of construction activities will be primarily due to dust, but the impact is unlikely to be significant at distances greater than 150 metres from the boundary of the site. Regarding the operational phase of the proposed scheme, results from both the DMRB assessment and the Breeze Roads assessment have shown that the greatest impact of traffic on air quality will occur at Receptor 4 (Fonthill Road South). Nonetheless, all results for the dominimum and do-something scenario are in compliance with the relevant air quality standards at all receptors. 9.6 Air Quality Mitigation 9.6.1 Construction Year (2009) 9.6.1.1 Construction Traffic The impact on air quality as a result of construction traffic will be temporary. As concentrations of NO2, CO, benzene, PM10 and PM2.5 are all predicted to comply with the relevant AQS as a result of the proposed scheme, no mitigation measures are proposed. 9.6.1.2 Construction Activities Construction dust emissions will be controlled by means of a construction environmental management plan. Emissions to air during the earthmoving and construction phases will occur, although the prevailing weather, the size of the site and its distance to sensitive receptors will assist in facilitating the management of any effects. The focus of the control procedures will therefore be to reduce the generation of airborne material. The following measures shall be included as a minimum as part of the construction environmental management plan to reduce dust emissions in the areas surrounding the site during construction: • Earthwork activities and site haul roads will be sprayed regularly with water using sprinklers and bowsers to damp down, particularly during periods of dry weather. • Vehicles and plant with low exhaust emissions will be used, and will be serviced regularly. Engines will not be left running unnecessarily. In addition, vehicles will be monitored entering the site for noticeable exhaust emissions and site security personnel December 2007 Page 154
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Kildare County Council South Dublin
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PLATES
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APPENDIX A5 - TRAFFIC AND TRANSPORT
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0 kilometres 2 Scale N.T.S Ordnance
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APPENDIX A8 - NOISE AND VIBRATION
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APPENDIX A9 - AIR QUALITY
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APPENDIX A11 - ECOLOGY
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APPENDIX A12 - ARCHAEOLOGY, ARCHITE
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