OPEN_796_EAONE_LANDSCAPE_SPECIFICATION 10 Aug 2016 APPENDIX 9
685 SURPLUS MATERIALS TO BE REMOVED • Topsoil: Remove from site excess topsoil. • Subsoil, stones, debris, wrapping material, canes, ties, temporary labelling, rubbish, prunings and other arisings: Remove.
690 TOPSOIL STORAGE HEAPS • Location: Throughout the site. • Height (maximum): 2.0 m. • Width (maximum): 5.0 m. - Formation: Loose tip and shape from the side only, without running machinery on the heap at any time.
• Protection: - Do not place any other material on top of storage heaps. - Do not allow construction plant to pass over storage heaps. - Prevent compaction and contamination, by fencing and covering as appropriate.
700 GRADING OF TOPSOIL • Topsoil condition: Reasonably dry and workable. • Contours: Smooth and flowing, with falls for adequate drainage. - Hollows and ridges: Not permitted.
• Finished levels after settlement: 25 mm above adjoining paving, kerbs, manholes etc. • Give notice: If required levels cannot be achieved by movement of existing soil.
705 HANDLING TOPSOIL • Aggressive weeds: Give notice and obtain instructions before moving topsoil. • Plant: Select and use plant to minimize disturbance, trafficking and compaction. • Contamination: Do not mix topsoil with: - Subsoil, stone, hardcore, rubbish or material from demolition work. - Other grades of topsoil.
• Multiple handling: Keep to a minimum. Use or stockpile topsoil immediately after stripping. • Wet conditions: Handle topsoil in the driest condition possible. Do not handle during or after heavy rainfall or when it is wetter than the plastic limit less 3%, to BS 1377-2.
710 SPREADING TOPSOIL • Temporary roads/ surfacing: Remove before spreading topsoil. • Layers: - Depth (maximum): 150 mm. - Gently firm each layer before spreading the next.
• Depths after firming and settlement (minimum): 450 mm. • Crumb structure: Do not compact topsoil. Preserve a friable texture of separate visible crumbs wherever possible.
715 LOOSE TIPPING OF TOPSOIL • General: Do not firm, consolidate or compact topsoil when laying. Tip and grade to approximate levels in one operation with minimum of trafficking by plant.
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