Dear all,
I appreciate this is a very old chestnut, but I'm looking for a consensus:
What would you say the proportion of topsoil to subsoil should be for 1000mm clean cover and 500mm clean cover:
Scenarios are 1) garden, 2) landscaped areas. AND the CoC's would be HC' S and metals and PAH's.
The reason I ask is that the choice of material for subsoil is obviously much less stringent.
We also ask for validation testing os 1 sample per 100m3 for all clean cover. Is this appropriate?
Thanks,
Clare
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