4.3.2 60
Embedded Mitigation
Calcifugous grassland at Target Notes 187b, 194, 372 and 374a are avoided through careful routing. Swamp dominated by Phragmites australis (Common Reed) is typically found along the banks of Martlesham Creek and in the valley of the River Mill, however this is avoided by crossing the watercourses by HDD.
4.3.3
Additional Mitigation During Construction
61 62
In all grassland, topsoil would be stripped, stored and replaced to retain the seed bank.
Reinstatement of improved grassland areas may be supplemented by seeding at the discretion of the landowner. In neutral grassland areas natural regeneration is preferred and no supplementary seeding would be used.
63
For marshy grassland and swamp the working area at Target Note 344 and 375 would be reduced to 35m to minimise the extent of the habitat impacted. In this area additional consideration would be given for the use of bog matting (such as 5m-wide timber boards), for the running track. This would result in fewer disturbances to the habitats underneath.
64
When crossing damp or marshy grassland indirect hydrological impacts would be avoided through careful attention to the design of any replacement drainage schemes and the installation of water stops to prevent the cable trench acting as a preferential pathway for groundwater flow.
65
For the sections where disturbance cannot be avoided (i.e. the cable trench) topsoil should be removed, stored and reinstated and the area left to recover naturally.
Post construction 66
Monitoring of planting and seedlings would be undertaken 5 years after the completion of the works. Walkover surveys, following the baseline methodology would be undertaken in years 1, 3 and 5. As set out within the Landscape mitigation Volume 3, Chapter 29 of the ES, any new planting would be subject to maintenance and a replacement-planting programme to ensure successful establishment.
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