70 of 74  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  equation)  xi. Required amount of FeCl3 as 100% product  : xi = x / 0.345 kg FeCl$_{3}$/day (to be  calculated by the tenderer based on the above equation)  xii. Solution strength of Ferric Chloride (FeCl3)  : 40%  xiii. Required amount of FeCl3 as 40% product  : xiii = xi / 0.40 kg FeCl$_{3}$/day (to be  calculated by the tenderer based on the  above equation)  xiv. Yearly required amount of FeCl3 as 40%  product  : xiv = xiii * 365 kg FeCl$_{3}$/year (to be  calculated by the tenderer based on the above equation)  3.4.2.3 Chemical for Nitrogen Removal 3.4.3 Natural Gas Consumption Commitment  The Tenderer hereby commits that chemical for nitrogen removal is less or equal to the one declared in  Volume 4 Schedule 11.6.  The committed consumption of natural gas is based on consumption for the sludge drying plant.  The Tenderer commits that the natural gas is less or equal to the specified below:  The tenderer shall follow strictly all the conditions herein stated in his natural gas consumption  calculation for the sludge drying plant. Any other assumptions, figures and factors shall NOT be used  unless clearly stated. Conditions i. Daily operation hour of the drying plant  : 24 hours/day  ii. Calorific value of the gas for consumption calculation  : 9155 kcal/m$^{3}$  iii. Dewatered sludge DS content  : 22%  iv. Dried sludge DS content  : 90%  3.5 Non-performance Damages for Exceeding OPEX Commitment Pursuant to Clause 12.4 of the Conditions of Contract non-performance damages shall be due for  failure to meet the Commitments for Operating Costs stated in Schedule 10 and Schedule 11 of  Volume 4.  3_Vol3_d4.3_Section 3_Plant Description_GIR_rev08 