Hi Bob short answer is yes

yes

are you using them for raised beds? Line them with pond liner fabric.
I wouldn't use them for veggies.

Even then unless they are on hard standing the bitumen will leak into the soil below them

Thanks folks, i wasnt sure if Bitumen would break down in soil, harmlessly i dont even know what it is actually.

Bitumen is similar to tar - not something you want in your soil it will not break down and it will pollute the soil.

Thanks Moon .You were right the spuds were deep, and they are tasty.