36 of 49 Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 05: Earth Works, Pipe Works and Ground Improvement  The preliminary test piles shall be located in places proposed by the Contractor and approved by the  Engineer. The Engineer shall be given at least 48 hours notice of commencement of construction of  the preliminary pile which is to be test-loaded.  The preliminary test piles shall be constructed/installed in a manner similar to that to be used for the  construction of the working piles by the use of similar equipment and materials. Any variation will  only be permitted with the prior approval of the Engineer.  The pile shafts shall be extended where necessary above the cut-off level or working piles so that  gauges and other apparatus to be used in the testing process will not be damaged by water or failing  debris and to permit exposure of the reinforcement.  Where the pile shaft is extended above the cut-off level of the working piles in soils which would in- fluence the load bearing capacity of the pile a sleeve shall be left in place during testing to eliminate  friction which would not arise in working piles.  If the cut-off level is below ground level and the shaft is not extended and there is a risk of the bore- hole collapsing, a sleeve shall be left in place or inserted above the pile shaft or other means satisfacto- ry to the Engineer shall be employed. Adequate clearance shall be given between the top of the pile  shaft and the bottom of the sleeve to permit unrestricted movement of the pile.  For piles that are tested in compression the pile head or cap shall be formed to give a plane surface  which is normal to the axis of the pile sufficiently large to accommodate the loading and settlement  measuring equipment and shall be adequately reinforced or protected to prevent damage due to the  concentrated application of load from the loading equipment.  The pile cap shall be concentric with the test pile and the joint between the cap and the pile shall have  a structural strength equivalent to that of the pile.  A sufficient clear space shall be made under any part of the cap projecting beyond the section of the  pile so that at the maximum anticipated settlement load is not transmitted to the ground expect through  the pile.  The connection between the pile and the loading equipment shall be constructed in such a manner as  to provide strength equal to the maximum load which is to be applied to the pile during the test with an  appropriate factor of safety on the structural design.  If the preliminary test pile fails to meet the requirements of the Employer’s Requirements, the piling  system proposed will be considered unsatisfactory. The Contractor shall then submit revised proposals  and calculations for the approval of the Engineer. Unless otherwise agreed by the Engineer any test  pile which has failed the preliminary test will be rejected and the Engineer may instruct the Contractor  to provide one or further test piles and tests to prove his modified system at no additional cost to the  Employer.  5.4.6.5 Lengths and tolerances  The Contractor shall determine the approximate lengths of piles by examination of the available ge- otechnical information including information obtained from any additional site investigations under  the Contractor. The final length of piles shall be decided by constructing the piles to a minimum depth  on the basis of the geotechnical information.  Piles shall be constructed within the following tolerances:   in plan, at the working level of the piling rig 0.15 x B in any direction from the designed posi- tion: B= pile dimension (diameter or side)   in section, 1horizontal:75vertical for a vertical pile  5_Vol3_d4.3_Section 5 Earth and pipe works_en_GIR_rev6.docx 