Table 26.12 Definitions of the magnitude levels for a receptor Magnitude


Definition High Medium Low


Fundamental, permanent / irreversible changes, over the whole receptor, and / or fundamental alteration to key characteristics or features of the particular receptors character or distinctiveness.


Considerable, permanent / irreversible changes, over the majority of the receptor, and / or discernible alteration to key characteristics or features of the particular receptors character or distinctiveness.


Discernible, temporary (throughout project duration) change, over a minority of the receptor, and / or limited but discernible alteration to key characteristics or features of the particular receptors character or distinctiveness.


Negligible


Discernible, temporary (for part of the project duration) change, or barely discernible change for any length of time, over a small area of the receptor, and/or slight alteration to key characteristics or features of the particular receptors character or distinctiveness.


Impact significance 80.


The combination of receptor sensitivity and impact magnitude was used to derive the overall impact criteria, as shown in Table 26.13.


Table 26.13 Impact Significance Matrix Sensitivity


High High


Medium Low


Major Major


Moderate Negligible Minor 81. Medium Major


Moderate Minor


Negligible Magnitude Low


Moderate Minor Minor


Negligible Negligible Minor


Negligible Negligible Negligible


No change


No impact No impact No impact No impact


The impact significance categories are defined as shown in Table 26.14.


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 26 Noise and Vibration Page 24


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