4.5 4.5.1 74
Watercourses and Ponds Baseline
Detailed baseline relating to Coastal Habitats is provided in Volume 3, Section 24.5.2.10 of the ES. Rivers and streams are Priority Habitats in the UKBAP. The River Deben and Martlesham Creek are considered to be of international importance due to site designations. River Gipping (sections) and the Mill River are of county importance with the smaller streams having local value only. Ditches along the Onshore Cable Route support abundant vegetation and some are of local value. Ponds are a UKBAP Priority Habitat and Suffolk LBAP habitat, however no ponds are crossed by the Onshore Cable Route. Habitat information is included in Appendix 24.2 of the ES which details the Phase 1 report.
4.5.2 75 4.5.3 76 Pre-construction Survey
A pre-construction walkover survey would be conducted to confirm the location of water crossings
Embedded Mitigation
The main river crossings of Martlesham Creek and The Deben would be crossed by HDD techniques. HDD would be used for the Kirton Creek and River Gipping crossing. Crossing points and crossing methodologies (e.g. HDD) have been chosen to minimise impacts and preserve valuable features as far as possible. Other watercourses would be subject to open cut crossing techniques. Habitat removal would, where practicable, be restricted to the minimum working width of 35m.Where possible spoil to be set back 5m from watercourses to minimise potential for silt run off from the working width.
4.5.4
Additional Mitigation During Construction
77 78
Bank-side vegetation would be retained, with trees and shrubs coppiced rather than grubbed-out where practicable.
Any aquatic vegetation removed during the process would be retained on the adjacent banks for 24 hours to allow the aquatic fauna to return to the water.
Outline Landscape and Ecological Management Strategy. Version 2
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