96.
Changes in predicted NO2 and PM10 concentrations between ‘without proposed East Anglia THREE project’ and ‘with Scenario 1’ and ‘with Scenario 2’ were compared to the significance criteria provided in EPUK guidance (EPUK 2010) and detailed in Table 20.15 and Table 20.16.
97.
The number of receptor locations experiencing each magnitude of impact is detailed in Table 20.26.
Table 20.26 Number of Receptors Experiencing Each Magnitude of Impact in Each Scenario Scenario 1
Number of Receptors Experiencing Defined Magnitude of Change
Imperceptible (increase <0.4µg.m-3) Small (increase 0.4 - 2µg.m-3) Medium (increase 2 - 4µg.m-3) Large (increase >4µg.m-3)
98.
Pollutant NO2
14 15 0 0
Scenario 2 Pollutant
PM10 29
0 0 0
NO2 5
17 7 0
PM10 23
6 0 0
Taking into account the concentrations in Table 20.24 and Table 20.25 and the magnitude of impacts in Table 20.26, the impacts as a result of Scenario 1 can be described as ‘negligible’ for both NO2 and PM10. For Scenario 2, NO2 impacts can be described as ‘negligible’ at all receptor locations except R6, where ‘slight adverse’ impacts are predicted. This is due to the proximity of receptor R6 to the road and the increase in HGV movements on adjacent road links. Scenario 2 PM10 impacts can be described as ‘negligible’ at all receptor locations, in accordance with EPUK (EPUK 2010) guidance.
99.
It should be noted that the ‘slight adverse’ NO2 impact predicted at receptor R6, as defined using the EPUK guidance (EPUK 2010), is not considered to be significant in EIA terms due to the temporary nature of the impact.
20.6.2 Potential Impacts during Operation 100. Operational phase impacts were scoped out of the assessment, as agreed by the Planning Inspectorate (Planning Inspectorate 2012, also see Table 20.1), and therefore they have not been considered.
20.6.3 Potential Impacts during Decommissioning 101. This section describes the potential impacts of the decommissioning of the onshore electrical transmission works with regards to impacts on air quality. The decommissioning of the project would be subject to a detailed decommissioning programme process as required by DECC under the Energy Act 2004. The approach
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 20 Air Quality Page 35
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