Table 21.3 Embedded Mitigation in relation to Water Resource and Flood Risk Parameter
General Pre-construction
Mitigation measures embedded into the project design
A Code of Construction Practice (CoCP) will be developed and agreed with the relevant local planning authority. The CoCP will include measures for avoiding the likelihood of spills and leakages, such as:
The storage of oils and fuel within designated areas above ground and in impervious storage bunds with a minimum of 110% capacity to contain any leakages or spillages. In addition storage areas will be regularly inspected to identify any leak or spills;
Limit refuelling activities to designated, impermeable surfaced areas and use drip traps where possible;
Check and maintain equipment regularly to ensure that leakages do not occur;
Have spill kits available on site at all times; and Ensure site inductions for all staff, to include the above procedures and the locations of spill kits.
Construction
Reduced working width of 35m is proposed at all non-HDD watercourse crossings where possible. Watercourses would be reinstated to pre-construction condition as soon as reasonably possible following cable installation, dependent on weather conditions and excluding the converter station and jointing pit locations. Construction work will only be undertaken during periods of low flow whenever possible.
Aquatic ecology surveys will be undertaken prior to any construction (see Chapter 23 Ecology).
Open-cut crossings will be completed in the shortest possible time to avoid disturbance to habitats and reduce the potential flood risk.
Refuelling activities will be undertaken at a minimum of 30m from any watercourse and not on steep slopes leading to a watercourse.
Adequate spill control measures will be in place, including drip trays, nozzles and absorbent pads.
All spillages to ground or surface water will be recorded to the relevant statutory authority and reported as part of the incident notification procedures.
Construction works in relation to watercourses would be subject to detailed method statements to developed in consultation with the Environment Agency and local authorities before commencing construction.
Landfall Construction
Onshore cable route Project design
Preliminary Environmental Information May 2014
None
Initial cable routeing and site selection to avoid key sensitive land uses where possible e.g. potentially contaminated sites, landfills, mineral
East Anglia THREE Offshore Windfarm
Chapter 21 Water Resource and Flood Risk Page 11
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