That is the disconnect between "hazard" based waste regulation and "risk" based PIIA / development / planning regulations.
It is quite possible a material which contains contaminants (aka, "substances" e.g. metals / organigs etc) at concentrations below the level that would make them be considered as a "dangerous substance", but are above a risk based GAC / SSAC for a proposed land use.
This would mean the waste would be the non-hazardous mirror entry within WM2 and therefore potentially re-usable under the U1 excemption. I would however be surprised if the U1 exempt material could be used without an additional RA being undertaken to demonstrate the material would not cause a risk to HH or the Water Environment in the proposed
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