72.
As agreed with the Secretary of State (Planning Inspectorate 2012), impacts from the onshore operational phase and offshore construction and operational phases were not likely to be significant and were therefore not considered in the assessment.
20.6.1 Potential Impacts during Construction
20.6.1.1 Construction Phase Dust Emissions 73. A qualitative assessment of construction phase dust and PM10 emissions was carried out in accordance with the latest IAQM guidance (IAQM 2014). Full details of the methodology and dust assessment undertaken are provided in Appendix 20.1.
74.
The construction works associated with the proposed development have the potential to impact on local air quality conditions as described below:
Dust emissions generated by demolition, excavation, construction and earthwork activities associated with the construction of the proposed development, have the potential to cause nuisance to, and soiling of, sensitive receptors;
Emissions of exhaust pollutants, especially NO2 and PM10 from construction traffic on the local road network, have the potential to adversely impact upon local air quality at sensitive receptors situated adjacent to the routes utilised by construction vehicles; and
Emissions of NO2 and PM10 from non-road mobile machinery (NRMM) operating within the proposed development site, have the potential to adversely impact local air quality at sensitive receptors in close proximity to the works.
75.
If construction operations were un-mitigated, the effects of dust during dry and windy conditions, could lead to an increase in the 24-hour mean PM10 concentration immediately surrounding the proposed development site. However, the maximum background PM10 concentration, for the 1km x 1km grid squares covering the study area, is 19.79µg.m-3 in 2014 based on 2010 mapped background estimates. Therefore, the mapped background concentrations are 'well below' the annual mean PM10 Objective of 40µg.m-³. It is highly unlikely that the short-term construction operations would cause the annual mean Objective to be exceeded within the vicinity of the proposed East Anglia THREE project.
76. A qualitative assessment of construction phase dust and PM10 emissions was carried out in accordance with the IAQM guidance (IAQM2014).
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 20 Air Quality Page 27
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