You know what happens when soil is transported? Every little creature that lives in the soil - from plant seeds & roots to tiny animals - hitchhikes along and becomes part of the new environment. No big deal, you would say. But some plants, animals & microbes are invasive alien species. They overgrow or infest their new environment. The healthy ecosystem disappears. Buildings, roads, rivers, wildlife and crops are impacted. This comes at a huge cost to nature and to society.
Have you checked the soil you are about to move? Did you clean the soil from your boots, machinery & trucks in between jobs? The environment, your neighbours and your fellow taxpayers thank you!