Petroleum-contaminated sites are the most common kind of contamination there is, but after that there are chlorinated solvents. A lot of military installations use chlorinated solvents as degreasers. In the past, equipment may have been sprayed down with a solvent, generating runoff that contaminated the soil. Dry cleaners also use chlorinated solvents. It's a pretty common problem.
People enter graduate training in environmental engineering with a mix of backgrounds.
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