negligible) according to defined parameters expressed as a matrix, as shown in Table 17.7.


Table 17.7 Impact Significance Matrix Sensitivity


High High


Medium Low


Major Major


Moderate Negligible Minor 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


57.


The definitions of impact significance from the above matrix are outlined below in Table 17.8.


Table 17.8 Impact Significance Definitions Impact Significance


Definition Major


Very large or large change in receptor condition, adverse or beneficial, which are likely to be important considerations at a regional or district level. Major beneficial effects may contribute to achieving national, regional or local objectives in providing a significant positive gain to the environment. Major adverse effects could result in exceeding statutory objectives and / or breaches of legislation and give rise to serious concern. Such impacts are deemed significant in EIA terms.


Moderate


Intermediate change in receptor condition, adverse or beneficial. Moderate beneficial effects may provide some gain to the environment. Moderate adverse effects may give rise to some concern and are likely to be an important consideration at a local level. Such impacts are deemed significant in EIA terms.


Minor


Small change in receptor condition, adverse or beneficial. Minor beneficial effects may have some environmental benefits. Minor adverse effects may be undesirable, but of limited concern. Such changes are unlikely to be important in the decision making process and are deemed not significant in EIA terms.


Negligible No Impact


No discernible change in receptor condition. The impact is deemed not significant in EIA terms.


No change in receptor condition. The impact is deemed not significant in EIA terms.


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 17 Offshore Archaeology Page 33


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