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## 6.4.2 Standards and rules 

The Contractor shall carry out the works described in accordance with the appropriate Turkish Stand- ards (TS) and European (EN) standards. The main standards are, but shall not be limited by the fol- lowing: 

<img src='content_image/479462.jpg'>

Contractor shall provide printed or digital copies of these standards at the site office, for the use of the Engineer's and Contractor's personnel. 

## 6.4.3 Quality and testing of materials 

Should the Contractor propose to use materials complying with standards other than those specified above, he shall have submitted details of such standards with his Tender. At least two weeks before ordering materials, the Contractor shall send a written notice to the Engineer giving the following de- tails: 

 type, quality and quantities to be ordered from a steel mill 

