OPEN_796_EAONE_LANDSCAPE_SPECIFICATION 10 Aug 2016 APPENDIX 9


370 UNDERGROUND STRUCTURES IN LANDSCAPE AREAS • Generally: Remove walls, roads, foundations, disused services, drains, manholes and the like to minimum depth.


• Minimum depth below finished levels: - Grass, ground cover and perennial planting: 500 mm. - Shrub planting: 750 mm. - Within 2 m of tree planting: 1000 mm.


• Walls and slabs remaining: In every 10 m² of wall or slab, make a drainage hole at least 600 mm diameter.


DISPOSAL OF MATERIALS


410 EXCAVATED TOPSOIL STORAGE • Storage: Stockpile in temporary storage heaps 2m high, Confirm location of storage with Landscape Architect / Engineer prior to commencing works .


420 TOPSOIL STORAGE HEAPS • Location: To be confirmed. • Standard: To BS 3882. • Height (maximum): 2m. • 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.


421A TOPSOIL STORAGE HEAP TREATMENT • Treatment: Sow with legume rich grass mix, sowing rate 2.5g/m2. Refer to G4 Grass for Long Term Topsoil Storage . Supplier: Germinal Seeds GB Product Refernce: A17


441 SURPLUS SUBSOIL • Excavated material: Stockpile in temporary storage heaps. • Retained material: Spread and level surplus subsoil on site. - Locations: To be confirmed . - Protected areas: Do not raise soil level within root spead of trees that are to be retained. • Remaining material: Remove from site.


450 WATER • Generally: Keep all excavations free from water until: - Formations are covered. - Below ground constructions are completed. - Basement structures and retaining walls are able to resist leakage, water pressure and flotation.


• Drainage: Form surfaces of excavations and fill to provide adequate falls. • Removal of water: Provide temporary drains, sumps and pumping as necessary. Do not pollute watercourses with silt laden water.


454 GROUND WATER LEVEL, SPRING OR RUNNING WATER • Give notice: If it is considered that the excavations are below the water table. • Springs/ Running water: Give notice immediately if encountered.


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