Landfill design

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University of Padua

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Biogas

 

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Final design

The final design documents are used to obtain a permit from the regulatory agency and develop the landfill site. These documents must be sufficiently detailed to satisfy both requirements. As-built changes that occur during the operating life of the site are also recorded on these documents.

The plans submitted for a permit or license must show in sufficient detail the design of the landfill. Most states have specific submittal requirements. As a minimum the submittal should include:

 The soils and hydrogeologic study.

 The landfill layout, clearly showing the location of fill areas, storm drainage, roads, fences, buildings, leachate facilities and borrow areas. This layout is plotted on the site topographic map.

 Sufficient cross sections to show the bottom and top elevations of the fill, liner systems, the finish side slopes, and the location of any leachate facilities.

 Plan sheets detailing the groundwater monitoring systems, sedimentation control structures, leachate systems, roads, and other facilities to be constructed on the side.

 An operating plan for the site should be prepared. This plan would outline the workers and equipment needed to operate the site. The planned method for collecting and disposing of the leachte must be addressed. The plan must also include the estimated daily tonnage, the estimated life of the site, and a statement on how the site will be monitored after closing.

Once a permit/license is obtained for a site, it is necessary to build it. Since most landfill operators do not have the capabilities to construct all portions of the site, it might be necessary to prepare plans and specifications for the various individual projects. Separate contract documents might be prepared for:

 Fences

 Roads

 Buildings

 Liner systems

 Trench excavation

 Equipment

 Periodic testing of groundwater wells

 Scales

Much time and effort will be saved if the designer is able to use sheets of the plans submitted to the regulatory agency for the contract project plans.

Like civil engineering projects, a permanent system of control points must be established in the field. These control points will be used during the construction and operation of the landfill for horizontal layout. A series of benchmarks must also be established around the site.

A final cost estimate for the landfill must also be prepared.

 

 

Examples of plan sheets for a sanitary landfill:

1. Current state of the landfill site-Plan view.

2. Landfill sectors-Plan view.

3. Excavation and filling-Section view.

4. Lining and leachate drainage-Plan view.

5. Lining and leachate drainage-Details.

6. Leachate collection system-Details.

7. Biogas collection pipelines-Plan view.

8. Biogas collection system-Details.