Selection of Consultancy Services for Detailed Engineering Design and Construction Supervision of: Water Supply Systems; and The Kotu Faecal Sludge Treatment Plant, together with the Rehabilitation of Sanitation Infrastructure in Kotu and Banjul.

Scope as published

REQUEST FOR EXPRESSIONS OF INTEREST (CONSULTING SERVICES - FIRMS SELECTION) REPUBLIC OF THE GAMBIA The Gambia Water and Sanitation Project (WASAP) Project ID: P513113 Assignment Title: Consultancy Services for Feasibility Studies, Detailed Engineering Design, Procurement Support, Construction Supervision, and Defects Liability Support for Urban Water Supply Systems in Kombo East and Urban Sanitation Infrastructure in Kotu and Banjul Reference No.: GM-NAWEC-565968-CS-QCBS The Republic of The Gambia has received financing from the World Bank toward the cost of the Gambia Water and Sanitation Project (WASAP) and intends to apply part of the proceeds for consulting services for Feasibility Studies, Detailed Engineering Design, Procurement Support, Construction Supervision, and Defects Liability Support for Urban Water Supply Systems in Kombo East and Urban Sanitation Infrastructure in Kotu and Banjul. The Greater Banjul Area is the country's principal urban and economic center. Urban water services face major challenges including production constraints, intermittent supply, ageing infrastructure, limited storage capacity, and high levels of non-revenue water. Similarly, sanitation services in Banjul and Kotu are constrained by deteriorated sewerage assets, underperforming wastewater treatment facilities, and inadequate fecal sludge management infrastructure. WASAP will support the Government of The Gambia in addressing these challenges through investments aimed at improving service coverage, reliability, resilience, and sustainability of water supply and sanitation services. The assignment will support the preparation and implementation of priority investments in urban water supply and urban sanitation infrastructure, including: Urban water supply investments in Kombo East and Brikama East comprising boreholes, treatment facilities, storage reservoirs, transmission pipelines, distribution networks, household connections, SCADA systems, and power supply facilities; and Urban sanitation investments including rehabilitation and expansion of wastewater and sewerage infrastructure in Kotu and Banjul, fecal sludge treatment facilities, pumping stations, and associated infrastructure. Scope of the Services The consulting services will be undertaken in five phases: Phase 1: Feasibility Study Review existing studies, plans, records, GIS data and infrastructure information. Conduct socio-economic, service area, demand and affordability assessments. Undertake detailed feasibility studies for urban water supply and sanitation investments. Assess climate resilience, environmental and social requirements, institutional arrangements, technical options and implementation strategies. Conduct economic and financial analyses, including lifecycle costing and investment prioritization. Prepare feasibility reports and preliminary designs. Phase 2: Detailed Engineering Design Undertake topographic, cadastral, geotechnical, laboratory and utility investigations. Prepare detailed engineering designs for: Water supply facilities including boreholes, treatment systems, reservoirs, transmission mains, distribution networks and SCADA. Sanitation facilities include wastewater treatment systems, fecal sludge treatment plants, sewer networks, pumping stations and sea outfall improvements. Prepare design calculations, drawings, technical specifications, cost estimates, bills of quantities, and O&M documentation. Prepare procurement-ready engineering packages. Phase 3: Procurement Support Prepare complete bidding documents and technical specifications. Participate in pre-bid meetings and site visits. Provide support during bid evaluation and contract award processes. Respond to technical clarifications and prepare addenda where required. Phase 4: Construction Supervision and Contract Administration Supervise construction works and administer contracts. Monitor quality assurance, environmental and social compliance, occupational health and safety, cost and schedule…

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