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The costs of cleaning one cubic metre of soil (£)
Traditional dig and dump150-250  
Soil washing40-45 
Bioremediation(in situ) 2-24 (ex situ) 10- 30
Thermal (in situ) 10-22 (ex situ) 25 - 120
Chemical 10-40 
Phytoremediation (using plants)5-10 
Stabilisation15-35 
Soil treatment hub125-140 
Caveat emptor: Costs vary widely, so a robust contingency should always be factored into any development budget where contamination is a significant factor.