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Small Landfill Closure Criteria – Risk Assessment for Small Closed Landfills

December 2002, Ref. TR124

This report presents a method of Risk Assessment for small closed landfills and is the result of research funding from the Ministry for the Environment’s Sustainable Management Fund. Small landfills have been defined as being less than 15,000 cubic metres in volume.

The aim of the project is to develop a practical method to assist district and city councils to identify the risks from small closed landfills. A semi-quantitative risk assessment method was developed based on a hazard/ pathway/ receptor risk model. This allows individual hazards at each site to be ranked (high, medium, or low) and individual landfills to be ranked against each other. Ranking landfill sites allows Councils to set priorities, target monitoring and implement appropriate management plans.

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Contents:

Executive summary

  1. Introduction
    1.1 Background
    1.2 Project Outcomes
  2. Review of Existing Risk Assessment Methods for Contaminated Sites
  3. 3 Risk Assessment for Small Closed Landfills (RASCL)
    3.1 Hazard and Risk Identification
    3.2 Risk to Groundwater
    3.3 Risk to Surface Water
    3.4 Risk from Gas Accumulation
    3.5 Risk due to Surface Exposure
    3.6 Pathway Interactions
    3.7 Ranking of Landfill Site Hazards
  4. Application of RASCL Method
    4.1 Landfill Site Selection
    4.2 Verification of Method
    4.3 Limitation of RASCL method
    4.4 Relative Ranking of Small Closed Landfills
  5. Summary and Conclusions

References

 

 

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