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Silvertown Tunnel London UK

Silvertown Tunnel
One of the largest engineering projects in the world.

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On 19th October 2023, ByrneLooby will rebrand to Ayesa

ByrneLooby will officially adopt the name of its parent company, Ayesa, a global engineering and technology services provider.

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Izz Municipal Landfill

540 x 350

Solid waste management is one of the top priorities of the Oman government and Be’ah was established by royal decree to manage and plan the solid waste strategy. As part of their strategy, aging dumpsites were closed and replaced with new large, regional, engineered containment landfills. The Izz Landfill facility services the Al Dakhiliya Governate, some 140km southwest of Muscat with Nizwa as its capital.

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Our Role

From 2015-to 2019, Ayesa worked on behalf of Al Ahlia Environmental Services to provide a masterplan design for a 20 year, 4.8 million m³ extension to the existing MSW landfill and the detailed design for the first two phases of the project.

Al Ahlia was contracted to construct these two phases to provide an initial 2 million m³ of sanitary landfill capacity, with associated infrastructure and two new leachate evaporation ponds (4000 m²). Our role included the supervision, quality assurance, and verification of the works and the preparation of the operational, monitoring, and closure plans.



Pre-construction, our team conducted initial desk studies and appraisals to identify the environmental risks, to inform and optimize the landfill design. These included borehole investigations, background groundwater monitoring, geotechnical studies, trial excavation / rippability investigations; geological, hydrogeological, and hydrological assessments, and a flood risk assessment. Following approval of the Masterplan design by Be’ah, we provided the detailed design of Phases 2 & 3 of the landfill which included surface water management plans, earthworks, and containment engineering design (composite HDPE/GCL lining system). This design provided for geosynthetic and aggregate leachate drainage and a geosynthetic cap, all to EU/USEPA standards. The large-scale earthworks were designed and specified together with the specification and CQA plan for the geosynthetics installation.


We also provided the design and specification of the leachate collection, pumping, and treatment systems; the landfill gas management system, environmental monitoring systems and the surface water management plan. In addition, we undertook the design of the additional infrastructure required for both the construction and operational phases of the landfill including 2-way asphalt roads, roundabouts, access ramps, wheel wash, fencing, and storage areas.

Our experts prepared the technical specification and provided construction support to sign off all works to the highest standards. The engineering design included the preliminary / master plan which was pre-approved by Be’ah. This 20-year master plan included best practices for environmental monitoring and operations, as well as procedures and planning for the eventual closure. Throughout the process, our progress was presented to all stakeholders including Be’ah to ensure alignment and collaboration. The site was handed over progressively to the landfill operator as each phase was completed to ensure continuity of service to the local community.


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