Envirocare of Utah Inc. has won a $7 million contract to handle low-level mixed waste at the former Rocky Flats nuclear weapons plant.

Kaiser-Hill Co., which manages the site for the Energy Department, said Envirocare will transport, treat and dispose of 2,340 cubic meters of waste this year. The contract could be extended through 2000 and involve the eventual disposal of 13,000 cubic meters - about 50 percent of the low-level mixed waste remaining at the site.The waste contains small amounts of both radioactive and hazardous materials and is in the form of pondcrete and saltcrete, Kaiser-Hill said.

The first truckloads are scheduled to leave Rocky Flats in July.

Kaiser-Hill officials said the disposal of the waste would cut operational costs at Rocky Flats by $3.5 million a year.