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The dpc should be above the ground level in any case. It could be slate or pitch, guessing the age from the brickwork.
Also guessing, it's unlikely to be a footing - they tend to be flaired brick footing.
The concrete might just be another previous shitty path effort, and that damp looks like it could just be splashback. Dig it up.
Previous owner (cheap landlord) asphalted right up to the brickwork. I'm trying to excavate a french drain to allow better drainage and expose dpc.
After one layer it looks like concrete and can't see a dpc - do I need to dig out the concrete too or is that some kind of footing?