12.6.3.2.1 Sensitivity
469. As outlined previously, harbour porpoise and harbour seal are considered to have medium sensitivity to changes in prey resources, and grey seal are considered to have low sensitivity.
12.6.3.2.2Magnitude
470. The conclusions of the Chapter 11 Fish and Shellfish Ecology assessment are that during construction impacts will beminor adverse at worst. The impacts are considered to be intermittent and temporary, but could occur over the East Anglia THREE site (and beyond in the case of noise impacts from pile driving) in a limited number of noise sensitive species. Based on this assessment, the magnitude of the effect on marine mammals is considered to be negligible for all species.
12.6.3.2.3Impact significance
471. In grey seal, the combination of negligible magnitude of effect and low sensitivity provides an assessment of negligible impact.
472. The negligible magnitude of effect when combined with medium sensitivity in harbour seal and harbour porpoise concludes a negligible.
473. In the case of harbour seal at the UK level, the assessment is also negligible impact.
474. No further mitigation measures are considered for this impact beyond those embedded measures presented in section 12.3.2 and Chapter 11 Fish and Shellfish Ecology.
475. The confidence in the data underpinning the assessment for harbour porpoise is medium. The confidence in the data underpinning the assessment is considered to be high for grey seal, and medium for harbour seal.
12.6.3.3 Impact 3: Vessel interaction – ship strikes 476. Section 12.6.1.5 details the potential changes in vessel activity during the construction phase of the development. The number and type of vessels used during decommissioning are likely to be similar to these levels.
12.6.3.3.1 Sensitivity
477. As described previously, harbour porpoise have high sensitivity this impact, and harbour and grey seal have negligible sensitivity.
12.6.3.3.2Magnitude
478. The magnitude of the potential impact is likely to be negligible in all species (as described during construction). In the case of harbour seal at the UK level the magnitude of effect is also considered to be negligible.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 12 Marine Mammal Ecology Page 101
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