This is in the UK The contaminants are likely to be Fuel, the trench is dependent upon the volume we have to accommodate this could range from 2n -200m  300mm wide and 1.5m deep, infilled with 20mm washed gravel

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This is in the UK

The contaminants are likely to be Fuel, the trench is dependent upon the volume we have to accommodate this could range from 2n -200m 

300mm wide and 1.5m deep, infilled with 20mm washed gravel