REQUEST FOR EXPRESSIONS OF INTEREST (CONSULTING SERVICES– FIRMS SELECTION) FOR CONSULTANCY SERVICES FOR FEASIBILITY STUDY, ECONOMIC EVALUATION, PRELIMINARY DESIGN, PRELIMINARY ENVIRONMENTAL AND SOCIAL IMPACT ASSESSMENT, DETAILED ENGINEERING DESIGN, PREPARATION OF BIDDING DOCUMENTS AND SUPERVISION OF WORKS FOR UPGRADING OF MKATA – KWAMSISI ROAD SECTION (38KM) TO BITUMEN STANDARD