38 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  4.21.2.1  Pre-conditions for the verification of the process performance  The fulfillment of process performance covers only conditions that the Contractor is able to control  and regulate, whereas the following general and particular reservations are in force:   The average load of substances on the wastewater treatment plant will not exceed the pre- conditions stated in Section 2.3.   The maximum hydraulic load on the wastewater treatment plant will not exceed the pre- conditions stated in Section 2.2.   No harmful substances (heavy metals, toxins, etc.) are conveyed to the inlet in  concentrations that in accordance with ISO 9509 can effect an inhibition of more than 25%  of the nitrification process.   Tests shall be conducted by the End Recipient. A representative from the Engineer shall  supervise the performance testing and the verification. A representative from the  Contractor may also be attended to tests.   The wastewater treatment plant has completed its period of tests after completion. A  representative from the Engineer will supervise the performance testing and the  verification.   The wastewater treatment plant has been operated in accordance with Contractor's  operation- and maintenance manual.   The treatment process is operated under normal conditions (where influent characteristics  do not exceed the design parameters).  No occurrence of sludge with poor settling characteristics, which can result in non- compliance with the control requirements for suspended solids. Sludge with poor settling  characteristics is defined either as occurrence of sludge particles of a size (<10 µm), which  makes separation with standard sedimentation impossible or as occurrence of extraordinary  large amounts of filamentous bacteria. Poor settling characteristics as a result of raw  wastewater quality will not be the responsibility of the Contractor.   Failure in the delivery of electricity, water, chemicals etc., failure in analyses and  sampling, failure in sludge disposal, extreme weather, etc. has not occurred.   Nutrients are available in sufficient quantities, i.e. in incoming wastewater:  o Total Nitrogen/BOD$_{5}$  > 0.05  o Total Phosphorous/BOD$_{5 }$ > 0.01  o If excess of control requirements appears in the Defects Notification Period due to  appearance of one or more reservations, these data will be omitted from the total  assessment of plant operation.   If one or more pre-conditions for the verification of the process performance stated above  shall not be occurred in some days of OPEX monitoring period in DNP, the data of  consumables (electricity and chemicals) of those days shall be omitted from OPEX  4_Vol3_d4.3_Section 4 General Requirements_en_GIR_rev6 