Auditsite® : a tool for landfills


Developed by SPAQuE in 1996, Auditsite® is a decision-aid tool that allows the classification of landfills across Wallonia and the prioritisation of the sites.

The method used consists in identifying a maximum of environmental, sociological, geographical and other criteria, and assigning them a score based on a predefined grid.

For each landfill, the following three factors are studied:

  • the source (the nature of the wastes and their volume),
  • the transport (the pathway by which the pollutant can reach the receptor, e.g. groundwater),
  • the receptor (humans, ecosystems, etc.).

These three factors are of equal importance and each is assigned a score out of 100. The final Auditsite® score to be assigned to the site is calculated as the geometric mean of these scores and yields an overall score, also on a 100-point scale. Sites that exhibit observable or measured impacts on the surrounding environment or have a high risk of contamination will score high, whereas sites with minimal impacts or a low risk potential will receive a low score.

Auditsite® also takes into account the quality of the available information to be used for the evaluation of the environmental factors. The majority of the evaluated environmental factors receive an information quality coefficient (IQC) that is proportional to the level of knowledge of each of these factors.

The overall IQC is calculated on a 100-point scale and is given by the sum of the IQC of the three factors, "source", "transport" and "receptor".

The information obtained is then plotted on a graph, and each site classified into one of the five Auditsite® categories:

  1. Action will probably be required,
  2. Action may be required,
  3. Action is unlikely,
  4. Action is highly unlikely,
  5. Insufficient information (IQC less than 35).





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