OPEN_796_EAONE_LANDSCAPE_SPECIFICATION 10 Aug 2016 APPENDIX 9
650 NOTICE • Give notice before: - Setting out. - Spreading topsoil. - Applying herbicide. - Applying fertilizer. - Visiting site during maintenance period. • Period of notice: 1 week.
655 MECHANICAL TOOLS • Restrictions: Do not use within 100 mm of tree and plant stems.
660 GRADING SUBSOIL • General: Grade to smooth flowing contours to achieve specified finished levels of topsoil. • Loosening: - Light and non-cohesive subsoils: When ground conditions are reasonably dry, loosen thoroughly to a depth of 300 mm.
- Stiff clay and cohesive subsoils: When ground conditions are reasonably dry, loosen thoroughly to a depth of 450 mm.
- Rock and chalk subgrades: Lightly scarify to promote free drainage.
• Areas of thicker topsoil: Excavate locally. • Avoid over compaction.
665 SUBSOIL SURFACE PREPARATION • General: Excavate and/ or place fill to required profiles and levels, as section D20. • Loosening: - Light and non-cohesive subsoils: When ground conditions are reasonably dry, loosen thoroughly to a depth of 300 mm.
- Stiff clay and cohesive subsoils: When ground conditions are reasonably dry, loosen thoroughly to a depth of 450 mm.
- Rock and chalk subgrades: Lightly scarify to promote free drainage.
• Stones: Immediately before spreading topsoil, remove stones larger than 75 mm. • Remove from site: Arisings, contaminants and debris and Builders rubble.
670 INSPECTING FORMATIONS • Give notice: Before spreading topsoil for areas to receive forestry planting and lawn areas. • Notice period: 14 days.
675 PREPARATION OF UNDISTURBED TOPSOIL • Standard: In accordance with BS 4428. - Grading and cultivation: Category A.
• Hard ground: Break up thoroughly. • Clearing: Remove visible roots and large stones with a diameter greater than 75 mm. • Areas covered with turf or thick sward: Plough or dig over to full depth of topsoil. • Fallow period (minimum): Three months. - Weed control: At appropriate times seed with an approved leguminous seed mix.
680 SURPLUS TOPSOIL TO BE RETAINED • Generally: Spread and level on site: - Locations: Any areas where topsoil is required for new planting. - Protected areas: Do not raise soil level within root spread of trees that are to be retained.
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