Newlands Cross Upgrade EIS - European Investment Bank

South Dublin County Council N7 Newlands Cross Upgrade
Environmental Impact Statement
Arup Consulting Engineers
Table 9.10 Results of DMRB Modelling Assessment for Opening Year 2010
Receptor Description Scenario
R1 N7 East
R2 Belgard Road
R3 N7 West
R4
R113 Fonthill
Road
9.5.2.2 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 419.9 2.48 31 17.89 10.73
Do Something 412.85 2.46 30.38 17.69 10.61
Increase/Decrease -7.05 -0.02 -0.62 -0.2 -0.12
% Increase/decrease -0.4 -0.4 -1.6 -1.0 -0.5
Do Min 423.75 2.46 29.36 17.6 10.56
Do Something 417.71 2.45 28.76 17.42 10.45
Increase/Decrease -6.04 -0.01 -0.6 -0.18 -0.108
% Increase/decrease -0.3 -0.2 -1.5 -0.9 -0.4
Do Min 413.87 2.46 30.41 17.7 10.62
Do Something 408.57 2.45 29.89 17.53 10.52
Increase/Decrease -5.3 -0.01 -0.52 -0.17 -0.102
% Increase/decrease -0.3 -0.2 -1.3 -0.8 -0.4
Do Min 442.86 2.49 31.7 18.34 11.00
Do Something 452.49 2.52 32.19 18.59 11.15
Increase/Decrease 9.63 0.03 0.49 0.25 0.15
% Increase/decrease 0.5 0.6 1.2 1.3 0.6
The total predicted pollutant concentrations including the output values from the Breeze
ROADS model combined with the background concentrations for the opening year, 2010 are
presented in Table 9.11 below. The model output values are representative of the worst case
receptor values.
The receptor showing the highest concentrations of all pollutants, as a result of the proposed
scheme is Receptor 4 (refer to Figure 9.3).
For Receptor 4 the annual average concentrations of NO2, including background
concentrations, are predicted to be 26.2 μg/m³, which complies with the AQS of 40 μg/m³
(refer to Figure 9.4); the annual average concentrations of PM10 including background
concentrations are predicted to be 16.5 μg/m³ which complies with the existing AQS of 20
μg/m³ and 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. The annual average concentrations
of benzene experienced 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 73.9 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 an annual mean concentration and cannot be summed with the
8-hour mean concentration value. Nonetheless, since the annual CO background concentration
of 380.3 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 151