4 of 15 Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 10: Roads, Landscaping and Fences  that direct compaction of the sub-grade cannot be carried out as specified, unsuitable material shall be  removed and replaced with granular sub-base.  The materials for the sub-base and road-base shall be laid in layers, each not exceeding 150 mm or  being less than 75 mm. The total compacted thickness of the sub-base and road base shall not be less  than the specified nominal thickness. The sub-base and base in roads shall have each a minimum  thickness of 200 mm. Roads within the wastewater treatment plant site shall be at least 5 m wide.  Clearing and grubbing for road works shall be executed according to Section 5 of these Employer’s  Requirements.  The road formation shall be the surface obtained after completion of any earthworks.  Formations, immediately before being covered with sub-base or road base material, shall be clean, free  from mud and slurry and properly shaped and compacted to an even and uniform surface.  The preparation and surface treatment of formations shall be carried out after the reinstatement of any  excavations for services.  Where unsuitable material naturally occurs at formation level, it shall be excavated as directed by the  Engineer and it shall be removed from the Site. The resulting void shall be filled with a compacted  granular sub-base material, in layers not exceeding 250 mm uncompacted depth.  The sub-grade shall be compacted so that the dry density of the upper 150 mm of the ground or fill is  not less than 95% of the maximum dry density. Where the sub-grade is in natural ground, the compaction shall be carried out at or near the natural moisture content of the ground. Any irregularities or depressions that develop in the formation during compaction of the sub-grade shall be  corrected by loosening the surface of these places and adding, removing or replacing material and re-compacting so that the surface is smooth and uniform. Any area of sub-grade that shall become  muddy, broken-up or loosened due to weather conditions or otherwise damaged shall be corrected or  prepared again by the Contractor as specified above.  Within 48 hours of completion of a road formation, granular sub-base material shall be spread and  compacted to the required thickness. The sub-base shall be protected from deterioration due to ingress  of water, the adverse effects of weather and the use of Contractor's equipment. Compaction shall be  carried out in accordance with the following table:  10_Vol3_d4.3_Section 10 roads, landscaping and fences_en_GIR_rev6.docx  10.1.4 Sub-base construction  10.1.2 Clearing and grubbing  10.1.3 Road formations 