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670 BEDDING OF FRAMES FOR ACCESS COVERS AND SURFACE BOXES
• Bedding: Solidly in mortar, centrally over opening and level with surrounding
finishes.
- In road or pavement finishes: Flush, and square with block or slab joints.
- In grassed areas: Set 30 mm below soil surface. Haunch back edge of bedding
so that it is not visible.

675 BACKFILLING GENERALLY
• Backfill from top of pipeduct surround: Material excavated from the trench.
• Backfilling: Lay and compact in 300 mm maximum layers. Do not use heavy
compactors before backfill is 600 mm deep.

680 BACKFILLING UNDER ROADS AND PAVINGS
• Backfill from top of pipeduct surround: Granular sub-base material to Highways
Agency 'Specification for highway works', clause 803 (Type 1)..
• Backfilling: Lay and compact in 150 mm maximum layers.

710 TEMPORARY BRIDGES
• Construction traffic: After backfilling, provide temporary bridges over trenches to
prevent damage to pipeducts or services.

720 WARNING MARKER BOARDS, TAPES AND TILES
• Installation: During backfilling.
• Depth: Continuously, 200–300 mm above service pipe or cable or to requirements
of service undertaker if different.
- Pipelines deeper than 2 m lay additional marker 600 mm above the top of the
pipeline or to requirements of service undertaker if different.

COMPLETION

910 INSPECTION
• Inspection of pipeducts: Before backfilling.
Inspection by: Service undertakers representative.

920 TESTING
• Timing: Where services require testing as set out in the respective work section;
undertake tests before backfilling the service.
• Notice for inspection (minimum): 5 days.
• Defects: Report immediately.

930 DOCUMENTATION
• Record drawings: Submit.

RotF generic (intermediate) NBS 2014 6118-AEW-XX-XX-NBS-A-01