How (where) to dispose of tar?

"On the property, while cleaning up old buildings, I found a metal barrel full of black sludge - the smell and consistency suggest tar. How can it be legally and safely disposed of? The same question, but in relation to old paint, oil, grease, and crop protection agents (i.e. poisons)?"
"On the property, while cleaning up old buildings, I found a metal barrel full of black sludge - the smell and consistency suggest tar. How can it be legally and safely disposed of? The same question, but in relation to old paint, oil, grease, and crop protection agents (i.e. poisons)?"
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