Feasibility Studies & Landfill Designx

EI Australia’s CLM team is highly experienced in delivering comprehensive environmental services for a wide range of private industry and government clients.

Government regulators emphasis increased on the control and management of landfill sites and the assessment of soil, vapour emissions and environmental impacts from migrating groundwater contamination. Our capabilities and the services provided in relation to landfill sites are outlined as follows:

  • Site selection
  • Hydrogeological and geotechnical investigations.
  • Longer term monitoring requirements.
  • Geotechnical engineering
  • Hydrogeological assessment
  • Surface water management systems
  • Landfill Cell design and Leachate Management Plans
  • Gas extraction system
  • Cover materials specifications
  • Landfill gas risk assessment
  • Landfill closure plans
  • Landfill licence compliance monitoring
  • EPA applications for waste in operational purposes
  • Cost estimates (closure)

Landfill Environmental Management Plans (LEMPs)

Given the nature of waste disposal operations and their consequent long-term implication on the environment, EI Australia has substantial experience in all aspects of landfill operation and management and is ideally placed to provide landfill owners/ operators with environmental management plans, which not only meet regulatory requirements, but are also practicable.

In addition to meeting legislative requirements, a performance-based landfill environmental management plan prepared on the basis of best management practices is also a valuable tool for managing the long-term liability of landfilling operations.

Landfill Gas Emission Investigations and Leachate in Groundwater Monitoring

Assessments are commonly required for establishing baseline conditions and predicting future movement, quantity and quality of groundwater and the potential for leachate leaking from landfills to cause contamination.

For existing landfills subsurface assessments may include:

  • Subsurface gas monitoring for bulk hazardous ground gasses and potential migration of methane, carbon dioxide, carbon monoxide, hydrogen sulphide, and oxygen;
  • Surface gas monitoring of interim and final capped landfills for methane and carbon dioxide;
  • Soil and groundwater investigations involving soil property testing and laboratory analysis;
  • Drilling and installation of gas investigation and extraction and groundwater monitoring wells;
  • In-situ hydraulic properties measurements;
  • Landfill groundwater monitoring programmes and assessment of landfill leachate impacts on groundwater;
  • Test pumping to measure the quantity and quality of landfill gas, as well as determining the Radius of Influence (ROI) for gas extraction wells;
  • Detailed design and management of landfill leachate collection and treatment systems;
  • Fate and transport modelling of landfill leachate groundwater plumes for evaluation of potential containment strategies and the efficiency of such methodologies and likely impact, both on and off-site;
  • Landfill gas risk assessments; and
  • Groundwater (aquifer) risk assessment.

Landfill Geotechnical Services

  • Landfill cell construction audits;
  • Cell design and Leachate Management Plans;
  • Leachate and Water balances; and
  • Appraisal of landfill clay liner construction materials and identification of material sources.

Leachate Treatment

EI Australia is experienced in the design and implementation of leachate management plans and groundwater treatment systems at major landfills nationally, covering a wide range of geological conditions.

Following site assessments and identification of potential problems, EI Australia will design and undertake or manage trials of various technologies incorporating physical, chemical and biological treatment.

Gas Recovery

Recovery and utilisation of methane generated within a landfill has been demonstrated to be viable, and increasingly landfill operators are seeing the efficacy of this option in controlling odours, as well as harnessing the associated energy resource. EI Australia engineers have assessed such proposals, undertaking the economic evaluation and providing systems designs.

EI Australia engineers have also developed gas collection systems utilising conventional vertical gas extraction well technology, horizontal gas collection systems that are installed in shallow fill areas, and combined leachate extraction/gas collection wells and header systems. We have experience in lateral migration control involving gas extraction facilities both inside the waste mass and outside the refuse boundary.

Landfill Closure

EI Australia are able to provide final design and management plans for landfill closures to allow for confidence in closure procedures and the successful long-term management of the closed landfill.