19.4.3 Impact Assessment Methodology 31.


Potential impacts arising from the construction and operation of the onshore infrastructure are identified and assessed taking into account the following elements of the environmental baseline and their sensitivities:


 Geology;  Any past or present sources of land contamination;


 The presence of aquifers and potential groundwater flow beneath the site and surrounding area; and


 The presence of groundwater Source Protection Zones (SPZ). 32.


In order to fully understand the hazard posed to human health and geology, information from Chapter 21 Water Resources and Flood Risk regarding the presence and sensitivity of groundwater has been used to aid this assessment.


19.4.3.1 Sensitivity 33.


The general approach taken towards impact assessment is discussed in Chapter 6 Environmental Impact Assessment Methodology. Consistent with this approach, the sensitivity of each topic specific receptor has been considered based on the criteria presented in Table 19.6. The impact assessment has, therefore, been undertaken with reference to the definitions provided in Tables 19.6, 19.7 and 19.8.


Table 19.6 Definitions of Receptor Sensitivity Definition Sensitivity High Geology Deposit rare


Deposit/strata value high (national importance/de signation)


Soils


Deep naturally occurring soils, highly permeable and therefore highly susceptible to mobile contamination


Human Health


Children present with a risk of long term exposure


Hydrogeology (Groundwater)


Site within a ground- water Source Protection Zone (SPZ) 1


Principal Aquifer.


Groundwater flow contributes to an internationally designated site.


Site within close proximity to a Private Water Supply abstraction (in an area where there are no other sources of


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 19 Soils, Geology and Ground Condition Page 17


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