Table 21.2 Worst Case Assumptions Impact


Construction All impacts


Key design parameters forming realistic worst case scenario


Scenario 1 o Footprint = working width where haul road (16.1km, maximum 60 x joint pits outside haul road area, 15 laydown areas outside of haul road area, converter station compound and 9 CCS) = 101.8ha


o Permanent habitat loss at converter station compound = 2.61ha


o Total spoil = 38,888m3 from jointing pits


o Total residual spoil for removal offsite = 732m3


o Duration of works = 10 weeks at landfall, 44 weeks along Onshore Cable Route and 55 weeks at Converter Station


Scenario 2 o Footprint = working width x 32.84km (includes haul road, HDD and maximum 192 jointing pits, converter station compound and 9 CCS) = 193.2ha


o Permanent habitat loss at converter station compound = 2.61ha


o Total spoil = 188986m3 from trenches, jointing pits and HDD


o Total residual spoil for removal offsite= 40580 m3


o number of HDD activities = 8 o open cut water crossings (methodology to be determined and assessed for final ES)


o Duration of works = 10 weeks at landfall, 44 weeks along onshore cable route and 55 weeks at Converter Station


Operation All impacts


Both Scenarios


Maximum total operational land take =2.61ha (at converter station compound)


No above ground features along the onshore cable route, apart from marker posts for below ground jointing locations


Maximum ranges provided within project details.


Rationale


Maximum values provided within the project description


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 21 Water Resource and Flood Risk Page 9


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