13 of 15 Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 10: Roads, Landscaping and Fences  10.2.3 Gates  10.3 Landscaping  10.3.2 Material  10.3.1 General  River Sand  Top Soil  Grasses  Trees and Shrubs  Gravel  Gravel for use on the site for landscaping shall comply with TSE and be of 28 mm nominal size.  Trees and shrubs shall be of the species proposed by the Contractor and approved by the Engineer and  shall be of the best quality and free from disease. They shall be young stock or in the case of shrubs  may be established seedlings or cuttings. All must be sufficiently mature to survive transplanting from  the supply nursery. The rood systems of all plants shall be maintained intact in the soil in which they  have been grown and may be supplied in containers.  Type of grasses shall be proposed by the Contractor and approved by the Engineer.  Where the topsoil shall be sown with grass seed, the top 75 mm of the topsoil shall be brought to a fine  tilt suitable for seeding, and sowing shall be carried out as soon as practicable after completion of top  soiling having due regard to the season and the weather conditions. After the seed has been sown uniformly, they shall be raked and lightly rolled into the surface. The young grass shall be kept free  from weeds and any bare patches shall be re-seeded until an even close turf is established. The grass  shall be watered and rolled as required and maintained in good condition.  River sand for use on the site shall be obtained from an approved source. Existing top soil stripped from the site and stored in heaps adjacent to the works may be reused provided it has not become contaminated and is free of rubble and debris. Where insufficient site top  soil is available additional humus shall be imported from an approved source. Where the upper layer  of natural soil is poor in organic matter, it shall be improved to a minimum depth of 250 mm by add- ing either clay or sand or silt to create a loamy soil texture consisting of 40% sand (size > 0.05 mm),  30% silt (size 0.05 - 0.002 mm) and 30% clay (size < 0.002 mm).  Prior to commencement of any landscaping work, the Contractor shall submit to the Engineer for approval his detailed proposals for landscaping including the proposed species of grass, trees and  shrubs.  The gates shall be complete with all fittings such as rails, wheels, drop bolts; back catches, locking  bars, lock plates and lock including three keys. The gates shall be provided with locks of the cylinder  type.  The gate shall be operated both mechanically and manually. The gate shall be operated by a control  panel button in the guard house. The height of the gate shall be 1.20 m.  A sliding gate shall be installed at the entrance to the wastewater treatment plant site.  10_Vol3_d4.3_Section 10 roads, landscaping and fences_en_GIR_rev6.docx 