When treating a polluted site, estimating the quantities of soil to be decontaminated is a major concern. Discrepancies between diagnoses and the quantities actually cleaned up are frequent and have major consequences in financial, time and environmental terms. Against this backdrop, the study uses feedback from 23 industrial data sets and a survey of SSP professionals to identify the most appropriate methodologies for optimising estimates of the quantities of land to be remediated. In addition, the study provides quantified analyses of the discrepancies observed in real-life situations, confirming the impressions felt by professionals. The results lead to operational recommendations aimed at improving the quality of predictions in the diagnostic phase. The relevance of these recommendations was ensured by the involvement of some fifteen players recognised for their expertise in the field of polluted sites and soils.
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