Provisio of CONSULTANCY SERVICES FOR THE WORKS OF STUDY, DESIGN, OPERATION, MAINTENANCE AND PREPARATION OF THE OFFERING DOCUMENTS (STEREOTYPED MODEL) FOR IMPLEMENTATION OF TWO SANITARY SEWAGE WATER PURIFICATION & TREATMENT STATIONS FOR DRAINING 400 THOUSAND M3/DAY AND 60 THOUSAND M3/DAY ALONG WITH ALL NECESSARY PUMPING LINES BELONGING TO THEM