I recently sent some material from a pavement surface to be distinguished as either coal tar or bitumen. They have sent back a list of the contents of the material, and for the life of me I cannot confirm whether it is one or the other. Is there something i should be looking for (i.e raised Phenol/Benzo levels?) and what sort of levels should i expect for either coal tar or bitumen?
Any advice would be great! Attached is the results from the three samples