Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 11: Training, Operation Supervision and Maintenance  9 of 11 GS Grab sample.  Index  11.4.4 Management of consumables  Chemicals Management  DW When dewatering unit in operation.  DR When drying unit in operation.  The Contractor shall keep records of all chemicals used for the treatment of wastewater or sludge. The  Contractor shall put procedures in place to ensure that the treatment processes are optimized, to mini- mize the use of chemicals.  Energy Management  The Contractor shall keep records of the hours of operation of each item of electrical plant and the to- tal energy usage of the treatment plant. The Contractor shall put procedures in place to ensure that the  treatment processes are optimized, to minimize the energy consumption.  Unusual circumstances arising from industrial disputes, accidental spillage, mechanical breakdown,  power failure, stoppage for essential maintenance or abnormal weather conditions shall be noted by  the Contractor in detail and taken into consideration when interpreting the analytical data from the  treatment plant.  11.4.5 Recording of unusual or abnormal situations  The Contractor shall notify the Employer of any unusual occurrence or incident in respect of the pro- vision of the Operation and Maintenance Works. Notification shall be made by telephone with imme- diate effect and shall be followed by a written report of the occurrence or incident.  11.5 Maintenance of the Treatment Plant  11.5.1 General  The Contractor shall provide for the routine, planned, breakdown and repair maintenance of all assets  relating to civil, mechanical, electrical and electronic plant, equipment and infrastructure at the  wastewater treatment plant.  Maintenance includes measures taken in order to avoid failure of the plants and equipment in addition  to repair measures in case of failure. 11.5.2 Maintenance programme  The Database software for maintenance programme to be put in place by the Contractor shall be based  on a recognized maintenance methodology. The Contractor shall provide a statement of the methodol- ogy he proposes to adapt to the End Recipient for approval, before developing it in detail.  The maintenance regime adopted by the Contractor shall include:   Schedules for the maintenance of the treatment plant to include but not be limited to:  - a complete list of the assets to be maintained  - the frequency and type of routine and planned maintenance for each asset  11_Vol3_d4.3_Section 11 Training&Maintenance_en_GIR_rev6 