That Coalite plant was incredibly dangerous. The son of a farmer in the area advised that any offspring he had would be at very high risk of genetic defects.
But soil is/was an interesting one. It was classed as a mirror-entry in the European Waste Catalogue:
17 05 03* soil and stones containing hazardous substances
17 05 04 soil and stones other than those mentioned in 17 05 03
A testing regime was required to determine if it could be classed as 17 05 04 - then it could go to any landfill (often used as “daily cover”).
If found hazardous, further testing was needed to see if it could be accepted at a hazardous landfill facility. It might fail to meet the criteria.
Over the years, I have assessed chemical data from many sites. If I determined that they were hazardous, the job usually “disappeared off my radar”. But I did notice with interest the hauliers names on wagons taking soil for profiling into golf courses and development sites…
I suppose that, in these days of having “taken back control”, we will be ditching the European Waste Catalogue. This is called progress.