33 of 40 Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 04: General Requirements for the Execution and Completion of the Works  The performance of the whole of the works and each process unit shall be demonstrated to be in  compliance with the herewith Employer’s Requirements and the Contractor’s design for the  average and peak hydraulic flows and organic loads as set out in the herewith Employer’s  Requirements, Section 3.  The Contractor shall be responsible for setting up a system for completing the necessary  performance tests and reporting the results indicating whether or not compliance with the herewith  Employer’s Requirements has been achieved. In case of compliance and/or performance failure of any following tests, the Contractor shall repeat  the failed test(s) in the same way as explained below till satisfactorily complete them in a time to  be determined by the Engineer. All costs related to the improvement works, electrical and chemical  consumables, test analysis, man-power shall be paid by the Contractor.  The following conditions shall apply during the process proving period:   The number of the process units to be put into operation at the each treatment stage shall  be such selected that available flow shall cause the tanks operate at least at the average  flow. This condition shall be checked against the process design calculations;   The results of tests shall be adjusted to take account of the difference between the design  and actual flow and loads, where the Engineer considers appropriate.   The influent flow to each process unit shall be adjusted in order to achieve a  representative loading on that unit if the incoming loading is less than the design loading;  and   All air treatment units (if any) shall be operated with the design air load.  Preliminary treatment Spot samples from the dewatered grit and raw wastewater shall be taken over 7 consecutive days  and shall be analyzed for particle size. The required level of performance of the unit is to remove  95% of the particles having a specific gravity of 2.65 and size >0.20 mm. Minimum 5 samples  shall be in compliance with this criterion. . Tests shall be carried out at an accredited laboratory  selected by the Engineer.  A minimum of 12 sets of consecutive flow proportional 24 hours inlet and outlet composite  samples shall be taken and analyzed for COD, BOD$_{5}$, Total-Nitrogen, Total Phosphorus,  Suspended Solids and O$_{2}$. Tests shall be carried out at an accredited laboratory selected by the  Engineer. Simultaneous tests shall also be performed at the plant’s laboratory.  Minimum 10 outlet samples shall be in compliance with the final effluent quality standards set out  in Section 2.5.1 of the Employer's Requirements. Wastewater stream  Sludge stream  The following parameters shall be recorded over the process proving period:  4_Vol3_d4.3_Section 4 General Requirements_en_GIR_rev6 