...Tons of the toxic paint sludge dug out of the Ramapoughs' Ringwood neighborhood have been buried in a landfill near the Chippewas' reserve in Sarnia.…Clean Harbors takes the…worst from the Great Lakes region - waste from auto plants, refineries, foundries and chemical makers…The…landfill is carved into a…layer of natural clay and chalk, a unique geologic feature that the company claims makes it perhaps the safest hazardous waste dump in North America…Clean Harbors agreed to donate $60,000 to environmental groups last year for failing to properly report waste imported from the U.S…