#1 tell them to stop doing that as they are not permitted to dispose of HAZARDOUS WASTE by pouring it in your yard. That's lazy, unsafe, and I'm sure must violate a number business practice standards.
#2 Treat the area with some zeolite and some dry horticultural molasses. Adding some activated charcoal would help too.
_________________ Shepherd of the Trees
It is not our part to master all the tides of the world, but to do what is in us for the succor of those years wherein we are set, uprooting the evil in the fields we know so that those who live after may have clean earth to till.
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