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171 Spoil from the trench excavation will be stacked in the working width areas next to the crossing or removed by dump truck along the working area. Riverbed material will be stored separately and replaced following installation of the pipe. Once the ducting is installed the trench will be backfilled first with subsoil and secondly with the stored watercourse materials such that it is level with the rest of the bed of the watercourse.


172


The watercourse banks will be reformed to their original profile with the excavated material and/or stone pitching and/or soil filled bags or other protection where necessary. On completion of installation and backfilling, the pumps will be stopped and the dams carefully removed to allow the river to flow over the excavated area as slowly as possible to minimise sediment generation. The reinstated watercourse will be checked subsequently to ensure that flood flows have not caused damage.


11.6.4 In the Instance of a Ditch Being ‘Dry’ 173


If streams are ephemeral and the ditch is dry at the time of the crossing the above measures will not be required, however best practice soil storage and separation techniques will still be employed.


11.6.5 Environmental Protection 174


The following measures will be implemented to minimise environmental impacts:


Periods of low flow will be chosen wherever practicable. This will result in a quicker deposition from the water column of any sediment released


All watercourses and ditches will be maintained in effective working condition across the full working width for the duration of the works, and will be restored to a condition at least as good as before the commencement of the works


Construction methods will take into consideration plant and animal life, upstream and downstream of the crossing, and will be in accordance with the requirements of the Landscaping Management Scheme(s) and Ecological Management Plan(s) provided for by DCO Requirements 19 and 26, respectively


Ecological surveys and investigations will be completed in advance of any construction work taking place. Investigations should consider optimum timings for works (e.g. where possible avoiding fish spawning times). The necessary mitigation for notable species (including otters and water voles) discovered during the surveys will be agreed before construction takes place as agreed through the Ecological Management Plan(s) provided for by DCO Requirement 26


Outline Code of Construction Practice. Version 3.


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