How do you decontaminate land that has been contaminated with various toxic materials?

Is it safe to just unearth everything? I live around a lot of contaminated fields and it looks like companies just dig the ground, leave everything in a pile for a while (few weeks?) and then bring over the dirt elsewhere.

Is there a special process when cleaning up contaminated land?

[edit]: list of toxic materials: Benzene (pot), Benzo (a) anthracene, Benzo (b + j + k) fluoranthene, Tin (Sn), Petroleum hydrocarbons C10 to C50, Naphthalene (pot), Lead (Pb)

This is in Canada, Québec.

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