27 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  4.17.6 Excavations  4.17.7 Fire protection  4.17.8 Blasting  4.18 Inspection and Testing prior to Taking-Over  4.18.1 General  Blasting shall be performed in a controlled way and at the necessary depth, quantity and volume by  using only the explosives of such quantity and power and in the places, where no essential damage  can be made to the objects outside the defined blasting area borders. The Contractor shall repair all  the damages of structures or properties affected because of blasting in order to they comply with  their initial quality. Before execution of blasting works the Contractor shall make sure that all the  relevant measures have been taken, necessary for the security of humans and property and  protection from injuries or damages, and that the warning signs and signals, acceptable for the  Engineer and other authorities connected with safety and public policy, have been erected. If blasting is required for clearing of boulders and/or stone mass, it shall be allowed only after the  Engineer’s written approval, taking the relevant precautionary measures for protection of humans,  structures and private and public property. Blasting shall only be performed by experienced staff,  which has the necessary certificates to perform such work.  No blasting works may be executed without the Engineer's written consent.  In the Contractor’s constant disposition shall be staff trained in fire fighting and relevant  equipment in order to fight the fire irrespective of the cause of its outbreak.  If fire or explosion risk close to the works is caused by the location of combustible tanks or similar  dangerous plants or equipment, the Contractor shall immediately notify local authorities and the  Engineer about such risk. The Contractor shall take all the precautionary measures and shall  execute all orders issued by local authorities and the Engineer in order to prevent outbreak of fire  or explosion.  The Contractor shall take all the necessary precautionary measures in order to prevent the fire close  to the works, buildings etc. and shall provide relevant fire fighting equipment, if such arise. It is  not allowed to burn waste or construction waste on the site.  The Contractor shall take precautionary measures in order to prevent human injuries due to open  trenches. All the trenches, excavated materials, equipment and other obstacles, which may be  dangerous for humans, shall be well-lightened during the time period starting half an hour before  sunset until half an hour after sunrise, as well as in other low visibility circumstances. The amount  and position of lamps shall be sufficient in order that the scope of structures and location are  clearly understandable.  Protection of all the excavations shall be ensured with the help of temporary barriers, warning  signs, cones and signal lights in order to prevent accidents with humans and property damage. All  the signs shall be written in Turkish and shall comply with the requirements of local authorities.  (Yellow Book, Sub-Clauses 7.3 and 7.4)  The Contractor's quality assurance system shall include procedures for carrying out inspection and  testing of the works both on and off site during the design and construction phase. The Contractor's  4_Vol3_d4.3_Section 4 General Requirements_en_GIR_rev6 