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129 Where construction operations may impact the drainage regime, the work will be undertaken in consultation and agreement with the local Internal Drainage Boards. During the construction phase, local drainage will only be interrupted for the shortest possible period and will be reinstated to minimise any effect on local drainage or soil moisture content.


130 Wherever practical, the cable trench will be backfilled with arisings, in the order they were originally present to minimise alterations to the drainage pattern once construction and restoration have been completed. The reinstatement materials placed within the trench floor and sides will be at least as erosion-resistant as the original bed material but where appropriate may also be formed from a low- permeability material (e.g. a „clay plug‟) to ensure that no preferential drainage pathways are created). Existing ditches and field drains in close proximity to the operational site will be maintained and kept free from potential obstruction.


131 A Pollution Prevention Plan and Emergency/Incident Response Plan will form part of the project EMP to be agreed with the Environment Agency. This will be in accordance with the EA‟s „Pollution Prevention Guideline No.6 Working at Construction and Demolition Sites‟ and PPG 21 Incident Response Planning.


132 Generic pollution prevention and mitigation measures are likely to include:


Diversion of clean water away from working areas to reduce volumes of dirty water generation


Construction Consolidation Sites compounds will generally comprise a permeable crushed stone or aggregate surface laid on a geotextile membrane which will allow direct infiltration of rainfall run-off at the same time as trapping and filtering any sediment and contaminates. Where hard surfacing is considered for utilisation in potentially high risk areas of the construction compound, positive surface water collection systems for the management of rainfall-run-off to prevent the pollution of ground water will be considered where appropriate


Any wheel washes used in site compounds will operate where practical on a closed cycle basis and have self-contained water and silt collection systems. Where systems require a discharge these will be subject to consultation and in accordance with Environment agency requirements. Waste silts and sludges will be removed in accordance with Duty of Care requirements


Oil, water and silt separators will be used where applicable on construction compound surface water management systems to remove oils and fuels accidentally spilled/accumulated during construction. These will be maintained in accordance with the manufacturer‟s instructions to ensure they remain efficient


Outline Code of Construction Practice . Version 3. Page 38


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