Designing a New Landfill Development for Zero Net Discharge




Project Info

Client
Confidential

Location
Sumbawa, Indonesia

Description

Golder was engaged by the owner of an operating copper mine in Indonesia to assist with plans to construct a new landfill for the mine’s operational waste stream as the existing landfill was approaching its design capacity. The new landfill, with a target volume of 90,000 m3, would be used for disposal of solid, non-hazardous domestic waste and would need to comply with the site’s overarching environmental criteria of zero net discharge.

The scope of our work included full engineering design services, largely from our experienced team in Indonesia, drawing on our global expertise to provide specialist advice and peer review, ensuring international best practice.

From an initial site inspection and desktop review of alternative sites nominated by the client, we characterised relative risks and opportunities to help inform the selection of the final site. We coordinated the necessary geotechnical and hydrogeological investigations at the site to provide the design basis for the landfill and undertook office-based hydrology studies to plan and design the management of surface water.

Our team prepared an initial concept design based on the findings of our investigations, which we presented to our client along with a review of the site conditions for the proposed landfill area. Our optimised design took advantage of the existing landform at the site to achieve the target storage volume while minimising the number of cut-to-fill earthworks.

After incorporating our client’s feedback on the concept design, we prepared the detailed design documentation and full tender documentation. We continued to assist the client throughout the tender process, after the appointment of the contractor, and during the construction period in the form of audits of the construction quality assurance procedures.

Golder’s design, including a leachate collection and removal system, delivered a successful result for our client as well as for the surrounding environment. The best-practice design for the new landfill achieves our client’s overarching environmental management criteria for the project of zero net discharge to the surface and groundwater environment – and delivers another example of smart, sustainable waste management.


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