Take the criminal penalties to the maximum allowed; then sue him in civil court for every penny he has.
Then let the state and feds go after him for pollution!
If he is convicted of a crime, maybe they can get his pension revoked!
Community service is the answer.
Give him a hand saw and axe to chop up the dead trees. Then he can carry the wood, piece by piece, to the houses of local poor people to use as firewood next winter.
Then give him one of those tiny flower garden shovels and make him remove every cubic inch of contaminated soil and root. Give him a wheelbarrow to use to haul it to the dump.
Then he can pay for replacement trees to be shipped in.