The company said the waste contained only minute amounts of dioxin.

Electrical waste contains hazardous but also valuable and scarce materials.

But medical waste contains many plastics and other substances that worry air quality regulators.

"But by law, we cannot transport a hazardous liquid waste containing radioactive material."

The facility caused contamination of the ground water with hazardous waste containing heavy metals.

Other wastes, such as lead and radioactive isotopes, contain dangerous atoms.

The Federal officials said they were especially concerned about wastes containing dioxin which are discharged into streams.

The waste contains tin oxide, in proportions too minute for last century's miners to recover.

After vacuuming, the waste containing the infested material must be removed and discarded.

This waste would still contain some even finer copper ore and so there might he several such washings.