4 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 General Requirements for the Execution and Completion of the  Works 4.1 Safety Procedures 4.2 Quality Assurance System  4.2.1 General  4.2.2 Standards and Recommendations  (Yellow Book, Sub-Clause 4.9)  The Employer and the Contractor herein confirm their commitment towards the quality of the  Contract and in order to respond to the Contract requirements in an optimal way, a quality  assurance system shall be established.  A quality assurance plan shall be prepared by the Contractor where the Employer, the Engineer,  and the Head of the PIU shall participate actively in its development.  The Contractor shall within 30 days of the commencement date provide safety procedures for all  elements of the works. The Contractor shall set-up a suitable temporary fence around the wastewater treatment plant site  and if applicable at pipeline construction sites, during the performance of the Contract, in order to  protect the sites from public access, animal vagabondage etc. The wastewater treatment plant shall  have only one entrance gate, in order to ensure an efficient control over the site traffic.   (Yellow Book, Sub-Clause 4.8)  References to the relevant sub-clauses in the Yellow Book and Volume 2: Conditions of Contract  are given in the sub-sections below. The present section includes the general requirements for the execution and completion of the  works supplementing the descriptions in the Conditions of Contract for Plant and Design-Build  (referred to throughout this Section as the Yellow Book) and in Volume 2: Conditions of Contract.  The Contractor shall make sure that the quality control complies with the effective Turkish  standards and take guidance from the following international standards:  ISO 9000  Standards for the quality control and assurance - Guideline for selection and  utilization.  ISO 9001  Quality system - Model for the quality assurance in conception development,  production, installation, and after-sales support.  ISO 9002  Quality system - Model for the quality assurance in production and installation.  ISO 9003  Quality system - Model for the quality assurance in controlling and final tests.  ISO 9004  Quality control and element of the quality system - Guidelines.  ISO 8402  Quality management and quality assurance - Vocabulary.  4.2.3 Quality Assurance Procedure  The compilation of the quality assurance procedure shall start when the Contractor submits the  quality assurance plan, not later than thirty (30) days after the notice to commence the works.  4_Vol3_d4.3_Section 4 General Requirements_en_GIR_rev6 