12 of 15 Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 10: Roads, Landscaping and Fences  Surface  Permissible deviation, mm  Formation and sub-base  +10, -30  Base   15  Wearing surface or slab surface   6  The combination of permitted tolerances in the levels of different pavement courses shall not result in  a reduction in thickness of the pavement, excluding the sub-base, by more than 15 mm from that specified, and the maximum allowable irregularly of the wearing surface below a 3 m straight edge  shall be 3 mm.  Tiled pavements for walkways consisting of approved concrete slabs with a minimum thickness of 50  mm shall be laid on 20 mm of sand for final leveling. All slabs shall be of approved type and design  and shall be firmly bedded on the underlying course and shall be laid against each other. Upon completion of the slabs sand shall be strewed, and be compacted with a mechanical vibrating machine  of sufficient weight. The application projects shall be prepared by the Contractor and shall be subject  to approval of the Engineer.  10.1.21 Tiled pavements  10.1.22 Pre-cast units for kerbs and surface drainage  Kerbs and drains units shall be supplied and laid along the roads and parking areas to be constructed  on site.  Curves shall be provided with specially made bends as follows:  Curbs shall not be laid until the 28 day strength of the pre-cast unit is attained. Kerb sections shall be  set on compacted sub-grade. Any section deviating in line or level by more than 1 mm in 1 m shall be  lifted and re-laid. Joints shall be grouted up with mortar. The application projects shall be prepared by  the Contractor and shall be approved by the Engineer.  The quality of the concrete surface course, tiled pavement, kerbs and units for surface drainage shall  be according to Section 6 of these Specifications.  The fence on concrete parapet shall surround the whole wastewater treatment plant site.  The permanent fence shall consist of a galvanized steel wire mesh with 50 x 50 mm openings, and  three rows of barbed wire above the steel mesh. Height of steel wire mesh shall be 2.40 m and the distance between each barbed wire shall be 0.10 m. Total height of the fence 2.70 m. The poles bearing the barbed wires bend 30 degree from vertical to the WWTP site.  Fence poles per 3.00 m shall be galvanized iron pipe Ø 100 mm, t = 6 mm. The steel mesh shall be  secured to the posts at 0.30 m intervals along the height of the posts and the chain link fence shall be  supported by fixing to 3 wires strung from post to post. Furthermore, the steel mesh and posts shall be  embedded in the concrete foundation. 10.2.2 Fences  10.2.1 General  10.2 Fences and Gates  10.1.23 Concrete  10_Vol3_d4.3_Section 10 roads, landscaping and fences_en_GIR_rev6.docx 