The Ministry of Sanitation and Water Resources of the Government of Ghana required the final closure of the Kpone Landfill, a municipal solid waste (MSW) landfill located along the coastal part of Tema, in the Greater Accra Region of Ghana. The landfill consists of four cells and occupies a total of approximately 16 hectares (40 acres). After a thorough evaluation performed by the design-build team and input from the local community, ClosureTurf® (hereafter referred to as ClosureTurf), a three-layered soil-geosynthetic-turf system comprised of: (i) structured geomembrane; (ii) nonwoven geotextile with high-density polyethylene a(HDPE) grass blades (i.e., engineered turf); and (iii) sand infill ballast, was selected for the landfill’s final cover system. The ClosureTurf system was selected over a traditional or prescribed cover system (e.g., a modified RCRA Subtitle D final cover system) to demonstrate the application of geosynthetics sustainability in Ghana and to provide a technology transfer of alternative innovative cover systems.
Geosyntec’s Scope of Services
Geosyntec was retained to provide engineering design and technical support services to Watershed Geosynthetics, LLC (Watershed Geo), the manufacturer of ClosureTurf (the Client). In support of the landfill closure design, Geosyntec prepared closure design report with design calculations, technical specifications, and other support documents (i.e., design drawings, stormwater and gas management design plans, and CQA plan), required to demonstrate the effectiveness of the ClosureTurf system and also to meet the regulatory requirements in Ghana. The design calculations evaluated slope stability based on final cover system configuration, final cover settlement, stormwater management, landfill gas generation rates, and infiltration and leachate generation. Geosyntec also reviewed manufacturer quality control (MQC) test results and certification submittals to facilitate shipment of the ClosureTurf and geocomposite products to Ghana to meet the construction schedule. A construction schedule was developed by Geosyntec and provided to the design-build team to establish construction activity start and finish times to assist with completing the project in an efficient manner.
Following preparation of the closure design documents, Geosyntec representatives traveled to Ghana to provide training and technical support during closure construction activities. While overseas, Geosyntec observed waste regrading activities, inspected landfill gas extraction equipment, and performed site visits to additional landfill and waste processing facilities in Ghana. A series of recommendations, including use of appropriate air monitoring equipment, was developed to improve the performance of the operations at these sites following each visit and was provided to the owners and/or operators for their consideration.
Geosyntec’s involvement in this closure project demonstrates collaboration between Watershed Geo and Geosyntec to provide international partnership with waste management and consulting firms in Ghana, which aims to serve as an example to lead Africa on improving solid waste management practices for its citizens. The Kpone Landfill will be the first landfill in Africa, and one of the few landfills outside of the United States, closed with ClosureTurf. Geosyntec’s involvement with the Kpone Landfill represents an increase in the firm’s international opportunities of landfill design and consulting services.
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- Location: Kpone, Tema, Ghana
- Client: Watershed Geosynthetics, LLC
- Project Practice Areas: Water & Wastewater, Waste Management
- Type of Facility: Kpone Landfill
- Services Provided: Landfill closure design, Stormwater system design, Stability analyses, Infiltration equivalency analysis, Gas management system design, Review of MQC submittals, Site assessment reports, In-country technical support
- Type of Work: Closure Design
- Governing Regulation: State and Local